Preparation method of waste incineration fly ash and asphalt binder specimen and adhesion evaluation method thereof

Abstract

The present invention discloses a method for preparing waste incineration fly ash and asphalt binder specimens, and a method for evaluating the adhesion of the specimens. The research method comprises the following steps: preparing waste incineration fly ash particles-asphalt binder specimens, characterizing the distribution morphology of fly ash particles; defining and analyzing the unit fly ash adhesion mass value α, adhesion rate β and intrusion micro-distance d q The adhesion of the interface was initially and re-evaluated. If the re-evaluation requirements were met, the subsequent steps were carried out. Continuous and discontinuous groups of WFI fly ash-asphalt binder specimens were prepared. Bond and shear strength tests were conducted on the specimens to determine the stable bond strength value Φ and shear strength value θ. The adhesion of the contact interface was re-evaluated. This research method combines micro- and macro-levels to accurately evaluate the adhesion of the interface between WFI fly ash and asphalt, providing a theoretical basis for the recycling of WFI fly ash in asphalt pavement.

Description

Technical Field

[0001] The present invention relates to the field of solid waste resource utilization, and in particular to a method for preparing a waste incineration fly ash and asphalt binder test piece and a method for evaluating the adhesion thereof. Background Art

[0002] Sanitary landfill and incineration are the primary methods for harmlessly disposing of municipal solid waste. Due to its advantages in waste reduction and energy conversion, incineration has gradually replaced sanitary landfill as the mainstream technology for municipal solid waste management. However, when municipal solid waste is incinerated, a large amount of highly toxic fly ash remains in the flue gas purification and dust removal equipment. Fly ash has a complex structure, with a rough surface and abundant pores, and loose, porous particles. Because it contains harmful components such as heavy metals and dioxins, it has been listed as Class HW11 hazardous waste in my country's National List of Hazardous Wastes. Improper disposal can pose a significant threat to groundwater, the surrounding ecosystem, and human health. Current technologies for harmless treatment of landfill fly ash include melting / vitrification, cement curing, chemical stabilization, and acid or other solvent elution. Melting / vitrification is the most effective of these treatment technologies, offering a high volume reduction rate for the residue and destroying organic toxicants such as dioxins during the vitrification process. However, the treatment equipment is complex and the costs are high. Cement curing is a more common method due to its ease of operation and affordability. However, the chemical and physical stability of fly ash treated with cement curing is relatively weak. Chemical treatment is also a common treatment method. While simple to operate, changes in the chemical environment, such as pH, can lead to the leaching of heavy metals from the fly ash. Acid or other solvent elution can remove hazardous elements from the fly ash, but it may disrupt the solid structure of the residue, allowing for the release of more heavy metals previously bound within. Furthermore, subsequent wastewater treatment is required, adding to the costs. Asphalt is a highly adhesive and chemically stable material. When alkaline fly ash comes into contact with asphalt components such as asphalt acid and asphalt anhydride, the COOH groups in the asphalt components lose hydrogen atoms and react with metal cations such as Fe3+, Mg2+, and Al3+ in the fly ash to form water-insoluble, high-valent asphaltates, thereby enhancing the adhesion between the fly ash and the asphalt. However, the degree of asphalt coating of fly ash remains unclear, lacking an evaluation index and reference system to measure the strength of adhesion. Furthermore, the preparation method of the specimens in this evaluation system is also imperfect. Therefore, a method for preparing and evaluating specimens of waste incineration fly ash and asphalt binder is proposed, which has far-reaching engineering significance for the application of fly ash as a renewable resource in road construction. Summary of the Invention

[0003] The purpose of this invention is to provide a method for preparing waste incineration fly ash and asphalt binder specimens and a method for evaluating their adhesion. This method provides a comprehensive analysis of the adhesion between waste incineration fly ash and asphalt from multiple perspectives, combining macroscopic and microscopic analysis, to promote the resource utilization of waste incineration fly ash in asphalt pavement construction. The specific scheme is as follows:

[0004] A method for preparing a waste incineration fly ash particle-asphalt binder specimen, characterized by comprising the following steps:

[0005] (1) Place a certain mass of fly ash in a stirring pot and stir and mix the fly ash at a stirring rate of 300-500 rad / min for 5-10 minutes;

[0006] (2) After uniform mixing, use an electronic balance to weigh an appropriate amount of waste incineration fly ash and pass it through aggregate sieves with mesh sizes of 4.75 mm and 0.6 mm in sequence. The powdery material that passes through the 0.6 mm aggregate sieve is placed in container No. 1, and the fine aggregate that passes through the 4.75 mm sieve but remains on the 0.6 mm aggregate sieve is placed in container No. 2;

[0007] (3) Pour the fly ash powder material in container 1 and the fine aggregate in container 2 into clean containers respectively, and inject deionized water for washing; use qualitative filter paper to filter the garbage fly ash, wherein the powder material is placed in a clean container 3 and the fine aggregate is placed in container 4, and then put container 3 and container 4 into a preheated drying oven and dry them at 110°C for 24-36 hours; select a steel container with a size of 15cm×15cm×5cm or 10cm×10cm×5cm, use a brush to apply a layer of isolation agent with a thickness of 1mm-3mm on the side wall of the container, and then use an electronic scale to weigh the weight M0 of the steel container; spread the garbage fly ash in container 3 or 4 flat in the steel container with a spreading thickness of 2cm. When spreading, use a steel ruler with an accuracy of 0.1mm to ensure that the distance from any five points on the surface of the garbage incineration fly ash to the upper surface of the steel container is not greater than 3cm±1mm, and then use an electronic scale to weigh the total mass M1 of the steel container and the garbage fly ash;

[0008] (4) Heat the matrix asphalt to 160-110°C and divide it into four clean containers; pour asphalt into the four containers from the four corners of the steel container until the asphalt is leveled and filled on the surface of the garbage fly ash. During pouring, ensure that the asphalt pouring thickness is 1cm±1mm through quality control; place the steel container in a ventilated place for 6-12 hours, then weigh the total mass M2 of the steel container, garbage fly ash and asphalt, spread a layer of plastic film on the surface of the test bench, then turn the steel container upside down on the surface of the plastic film, take out the asphalt layer specimen with garbage fly ash adhered to the surface, and use a brush to brush off the fly ash not adhered to the asphalt surface to the plastic film, then use an electronic scale to weigh the total mass M3 of the asphalt layer and the garbage fly ash adhered to its surface;

[0009] (5) The asphalt layer adhering to the fly ash was placed in a constant temperature box at 5-10°C for 6-12 hours, and then placed on a clean laboratory table. The asphalt layer specimen was cut into three strips with a size of 5 cm × 15 cm × 1 cm or 3 cm × 10 cm × 1 cm using a cutter to complete the preparation of the waste incineration fly ash particle-asphalt binder specimen.

[0010] As a further improvement to the above scheme, an electronic scale is used to control the mass to ensure that the asphalt pouring thickness is 1cm±1mm, specifically: for a steel container with a specification of 15cm×15cm×5cm, the asphalt pouring mass is controlled to be 270g±1g, and for a steel container with a specification of 10cm×10cm×5cm, the asphalt pouring mass is controlled to be 120g±1g; and, the cross-section of the waste incineration fly ash particle-asphalt binder specimen refers to a cutting surface with a size of 15cm×1cm or 10cm×1cm.

[0011] The present application also provides a method for preparing continuous and discontinuous groups of waste incineration fly ash flat-asphalt binder specimens, comprising the following steps:

[0012] Weigh the required amount of fly ash onto a steel plate and inject deionized water for washing; filter with filter paper and place in a clean container, then dry in a 110°C drying oven for 24-36 hours; select a detachable steel container with a size of 15cm×15cm×20cm or 10cm×10cm×15cm, and apply a layer of isolation agent with a thickness of about 1mm to the side wall of the container; for a container with a size of 15cm×15cm×20cm, spread the fly ash in 4 times, and for a container with a size of 10cm×10cm×15cm, spread it in 3 times, with a thickness of 5cm each time; when the thickness of the fly ash reaches 5cm each time, add 10g of epoxy resin-curing agent mixture diluted with alcohol, where alcohol is 10% of the mass of the mixture, and mix and tamp it to make it dense; scrape off the fly ash that exceeds the surface of the container and place the container in a 60℃ constant temperature oven to dry for 6-11h; disassemble the container and take out the test piece, and place the fly ash test piece on the laboratory bench with the square bottom as the contact surface; grind the top surface and four side surfaces, and then use fly ash powder with a particle size of <0.3mm to smear the grinded test piece surface to complete the preparation of the fly ash test piece; place the fly ash test piece on the test bench, and then slowly rotate and pour the molten asphalt from the center point of the top surface of the test piece to the surrounding areas, and stop pouring after the asphalt is leveled and covers the surface of the test piece, so that all surfaces except the bottom are covered with asphalt; measure 5cm upwards from the bottom of the asphalt-coated test piece, and cut and mark it; use a cutting machine to cut the test piece according to the marked position, and then brush off the cutting debris at the bottom of the upper cut test piece, and properly grind the bottom surface to complete the preparation of a continuous group of waste incineration fly ash-asphalt binder test pieces.

[0013] As a further improvement to the above scheme, epoxy resin adhesive was used to evenly coat the surface of the waste incineration fly ash at the bottom of the specimen, and the specimen was fixed on a 50 kg steel base.

[0014] As a further improvement to the above solution, the cutting machine is a CNC laser cutting machine with a working width of 60cm×25cm and a working power of 1000W.

[0015] In addition, the present application also provides a method for evaluating waste incineration fly ash particles and asphalt binder specimens, comprising the following steps:

[0016] B1. Characterize the distribution of fly ash particles in the asphalt binder specimen prepared using the aforementioned method;

[0017] B2. Define and analyze the unit fly ash adhesion mass value α, adhesion rate β and intrusion distance d of the waste incineration fly ash particle-asphalt binder specimen q , conduct preliminary evaluation and re-evaluation of the adhesion of the interactive interface between waste incineration fly ash particles and asphalt;

[0018] B3. Conduct a preliminary evaluation of the MSW incineration fly ash particle-asphalt binder specimens to clarify the adhesion between the MSW incineration fly ash particles and the asphalt binder interface. A re-evaluation is then conducted. If the re-evaluation requirements are met, proceed to the next steps; otherwise, the evaluation is terminated.

[0019] B4. Conduct bond strength and shear strength tests on continuous and discontinuous groups of waste incineration fly ash flat-surface asphalt binder specimens prepared using the aforementioned method to determine the bond strength stability value Φ and the shear strength stability value θ.

[0020] B5. Re-evaluate the waste incineration fly ash plane-asphalt binder specimen to clarify the adhesion of the contact interface between the waste incineration fly ash plane and the asphalt binder.

[0021] As a further improvement to the above scheme, the definition of step B2 and the analysis of the unit fly ash adhesion mass value α, adhesion rate β and intrusion micro-distance d of the waste incineration fly ash particles-asphalt binder specimen are q The adhesion of the interaction interface between the fly ash particles and asphalt was initially evaluated and re-evaluated. The specific method was as follows: the adhesion of the interaction interface between the fly ash and asphalt was evaluated by combining the mass parameters of the fly ash adhered to the fly ash per unit asphalt and the geometric parameters of the fly ash intrusion into the asphalt; the mass parameters of the fly ash adhered to the fly ash per unit asphalt include the unit fly ash adhesion mass value α and the adhesion rate β; the geometric parameter of the fly ash intrusion into the asphalt is the intrusion micro-distance dq;

[0022] The unit fly ash adhesion mass value α is defined as the mass of waste incineration fly ash adhered to the asphalt surface and interior per unit asphalt mass (g / g). The calculation formula is: α = (M1 + M3 - M2) / (M2 - M1); where M1 is the total mass of the steel container and the fly ash inside (g); M2 is the total mass of the steel container, fly ash, and asphalt (g); and M3 is the total mass of the asphalt layer and the waste incineration fly ash adhered to its surface (g).

[0023] The adhesion rate β is defined as the percentage (%) of the mass of adhered waste incineration fly ash to the total mass of fly ash in the steel container. The calculation formula is: β = (M1 + M3 - M2) * 100% / (M1 - M0); where M0 is the mass of the steel container (g);

[0024] Invasion Macro d q It is defined as the actual distance that fly ash from garbage incineration penetrates into the asphalt binder. The calculation formula is: where d opti is the migration distance of the MSW incineration fly ash particles-asphalt binder specimen (mm);

[0025] Among them, the xy coordinate system is established with the specimen section length as the x-axis and the thickness as the y-axis.

[0026] The upper limit of the migration distance d1 is defined as the distance (mm) from the particle position of the maximum migration distance to the vertical line of the x-axis;

[0027] The migration distance lower limit d2 is defined as the distance (mm) from the particle position of the minimum migration distance to the vertical line of the x-axis;

[0028] The calculation formula of the migration macro distance dopti is: dopt=(d1+d2) / 2, where the units of d1, d2 and dopti are all mm, d1>d2,

[0029] The quality parameters and geometric parameters are determined according to the above formulas, and the evaluation limits are selected according to the specimen size. The adhesion of the interactive interface between fly ash and asphalt is initially evaluated and re-evaluated.

[0030] As a further improvement to the above scheme, the bonding strength test of the waste incineration fly ash plane-asphalt binder specimens described in step B4 is carried out to determine the bonding strength stability value Φ. The specific operation is as follows: 6 continuous groups of waste incineration fly ash plane-asphalt binder specimens and 3 discontinuous groups of waste incineration fly ash plane-asphalt binder specimens are prepared as the bonding strength test group; 3 continuous groups of waste incineration fly ash plane-asphalt binder specimens and 3 discontinuous groups of waste incineration fly ash plane-asphalt binder specimens are prepared as the shear strength test group;

[0031] Conduct a bonding strength test on the bonding strength test group to determine the bonding strength stability value Φ, specifically:

[0032] For three non-continuous groups of waste incineration fly ash flat surface-asphalt binder specimens, epoxy resin adhesive was used to bond the pulling head to the five asphalt surfaces of the specimens. After the adhesive was fully cured, the specimens were installed in the fixture of the tester. The tester was started and a load was applied to the specimens. The test was stopped immediately when the specimens were damaged, and the non-continuous bond strength Φ at this time was recorded. 非连续i ; After completing 3 parallel tests, calculate the average value of discontinuous bonding strength Φ 非连续 , the calculation formula is:

[0033]

[0034] For six consecutive groups of MSW fly ash flat-asphalt binder specimens, epoxy resin adhesive was used to bond the puller head to the top surface of any three specimens. For the remaining three specimens, the puller head was bonded to any side surface of a single specimen in turn. After the adhesive was fully cured, the specimen was installed in the fixture of the tester. The tester was started and a load was applied to the specimen. The test was stopped immediately when the specimen was damaged, and the continuous bond strength Φ at this time was recorded. 顶面连续i (or Φ 侧面连续i ); after completing 6 tests, calculate the average value of continuous bonding strength Φ 连续 , the calculation formula is:

[0035]

[0036] The stable value Φ of the bond strength of the waste incineration fly ash plane-asphalt binder specimen is calculated according to the following formula:

[0037] Φ=aΦ 连续 +bΦ 非连续

[0038] Where: Φ is the stable value of the bonding strength between the waste incineration fly ash plane and the asphalt binder specimen; Φ 连续 is the average bonding strength of the continuous waste incineration fly ash plane-asphalt binder specimens; Φ 非连续 is the average bonding strength of the discontinuous waste incineration fly ash plane-asphalt binder specimen; a is the continuous bonding strength stability ratio parameter, ranging from 0.64 to 0.77; b is the discontinuous bonding strength stability ratio parameter, ranging from 0.23 to 0.36, and parameter a+b=1; when the average discontinuous bonding strength Φ 非连续 Average value of continuous bonding strength with top surface Φ 连续 If the difference is greater than 0.04 MPa, a is taken as 0.77; if the difference is less than 0.01 MPa, a is taken as 0.64.

[0039] As a further improvement to the above scheme, a shear strength test is conducted on the shear strength test group to determine the shear strength stability value θ, specifically:

[0040] Fix the specimen in the fixture of the universal testing machine and adjust the fixture position so that the shear surface of the specimen is parallel to and just in contact with the shear head of the equipment. Set the load speed to 15mm / min, start the equipment and perform a shear test on the specimen. The maximum shear strength at the time of specimen failure is used as the test result.

[0041] For three non-continuous groups of waste incineration fly ash plane-asphalt binder specimens, shear strength tests are required on five asphalt-covered surfaces. The maximum shear strength when the specimen is damaged is recorded as θ. 非连续i After completing 3 parallel tests, calculate the average value of the discontinuous shear strength θ非连续 , the calculation formula is;

[0042]

[0043] For three consecutive groups of waste incineration fly ash plane-asphalt binder specimens, the shear strength test of the top surface of the specimens is required. When the specimens are damaged, the maximum shear strength is recorded as θ 顶面连续i After completing 3 tests, calculate the average value of continuous shear strength θ 连续 , the calculation formula is:

[0044]

[0045] The shear strength stability value θ of the waste incineration fly ash plane-asphalt binder specimen is calculated according to the following formula:

[0046] θ=aθ 连续 +bθ 非连续

[0047] Where: θ is the shear strength stability value; θ 连续 is the average value of continuous shear strength; θ 非连续 is the average value of discontinuous shear strength; c is the stable ratio parameter of continuous shear strength, ranging from 0.59 to 0.72; d is the stable ratio parameter of discontinuous shear strength, ranging from 0.21 to 0.41, and parameter c+d=1, when the average value of discontinuous shear strength θ 非连续 and the average value of continuous shear strength θ 连续 If the difference is greater than 0.003 MPa, a is taken as 0.72; if the difference is less than 0.0009 MPa, a is taken as 0.59.

[0048] Beneficial technical effects

[0049] Compared with the prior art, the advantages of the present invention are that it provides a method for preparing waste incineration fly ash particle-asphalt binder specimens, and proposes definitions, calculation methods and evaluation indicators for the unit fly ash adhesion mass value, adhesion rate and intrusion macro-distance for the specimens. Through the specimen preparation method and evaluation method provided by the present invention, the distribution characteristics and evolution laws of waste incineration fly ash in the asphalt medium can be accurately analyzed, and the adhesion of the interactive interface between waste incineration fly ash particles and asphalt can be accurately evaluated. On this basis, a preparation method for continuous and discontinuous groups of waste incineration fly ash plane-asphalt binder specimens is provided. For the continuous and discontinuous groups of waste incineration fly ash plane-asphalt binder specimens, evaluation indicators of bonding strength stability value Φ and shear strength stability value θ are proposed, which can accurately evaluate the adhesion of the contact interface between the waste incineration fly ash plane and the binder. The preparation method and evaluation method of the entire set of specimens are simple and easy to operate, and the preparation and evaluation efficiency is high. Moreover, the evaluation indicators and methods of this method combine microscopic and macroscopic means to make an accurate evaluation of the adhesion between garbage fly ash and asphalt, providing an effective evaluation method for the covering effect of asphalt on garbage fly ash, and also providing a simple and easy preparation method for its test specimens, providing an effective reference basis for the resource utilization of garbage fly ash by asphalt, and at the same time providing a theoretical basis and technical support for the recycling of garbage fly ash in the field of road construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a flow chart of the technical solution of the present invention.

[0051] Figure 2 This is a characterization diagram of the migration behavior of the waste incineration fly ash particles-asphalt binder specimen of the present invention.

[0052] Figure 3 This is a macro-numeric diagram of the migration of the waste incineration fly ash particles-asphalt binder specimen of the present invention.

[0053] Figure 4 This is a schematic diagram of the shear test of the waste incineration fly ash plane-asphalt binder specimen of the present invention.

[0054] Among them, Figure 4 Middle: 1-clamp; 2-cutting head; 3-asphalt; 4-fly ash. DETAILED DESCRIPTION

[0055] The present invention will be further described below with reference to the following embodiments. It should be understood that the embodiments described are only a portion of the present invention, not all of the embodiments. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0056] Unless otherwise specified, the materials, methods and equipment used in the present invention are conventional materials, methods and equipment in this technical field.

[0057] Unless otherwise specified, all reagents and materials used in the following examples were commercially available.

[0058] In a method for preparing a waste incineration fly ash and asphalt binder specimen provided by the present invention, the waste incineration fly ash particle-asphalt binder specimen prepared by the preparation method is convenient for characterizing the distribution morphology of the waste incineration fly ash particles in the specimen. The preparation method of the above-mentioned specimen is specifically as follows:

[0059] A certain amount of waste incineration fly ash is taken out from the waste incineration fly ash storage device and placed in the mixing pot of the powder mixer. The waste incineration fly ash is stirred and mixed at a stirring rate of 300-500 rad / min for 5-10 minutes. After sufficient stirring, the fly ash is taken out and placed in a clean container;

[0060] Use an electronic balance to weigh an appropriate amount of waste incineration fly ash and pass it through aggregate sieves with mesh sizes of 4.75 mm and 0.6 mm in sequence. The powdery material that passes through the 0.6 mm aggregate sieve is placed in container No. 1, and the fine aggregate that passes through the 4.75 mm sieve but remains on the 0.6 mm aggregate sieve is placed in container No. 2.

[0061] Pour the fly ash powder material in container No. 1 and the fine aggregate in container No. 2 into clean containers respectively, and inject deionized water with a water quality level of EW-IV to fully soak the waste incineration fly ash and then wash it with water;

[0062] Use qualitative filter paper to filter the waste incineration fly ash, wherein the powdery material is placed in a clean container 3, and the fine aggregate is placed in container 4. Then, container 3 and container 4 are placed in a preheated drying oven and dried at 110°C for 24-36 hours;

[0063] Select a steel container with a size of 15cm×15cm×5cm or 10cm×10cm×5cm, use a brush to apply a layer of release agent with a thickness of 1mm-3mm on the side wall of the container, and use an electronic scale with an accuracy of 0.1g to weigh the weight M0 of the steel container;

[0064] Spread the fly ash from container 3 or 4 evenly in a steel container with a thickness of 2 cm. When spreading, use a steel ruler with an accuracy of 0.1 mm to ensure that the distance from any five points on the surface of the fly ash to the upper surface of the steel container is no more than 3 cm ± 1 mm. Then, use an electronic scale to weigh the total mass M1 of the steel container and the fly ash.

[0065] Heat the base asphalt to 160-110°C and then divide it into four clean containers. Slowly and steadily pour asphalt into each of the four containers from the four corners of the steel container until the asphalt is leveled and completely fills the surface of the waste incineration fly ash. Use an electronic scale to control the quality during pouring to ensure that the asphalt pouring thickness is 1cm±1mm.

[0066] Place the steel container in a ventilated place for 6-12 hours, then weigh the total mass M2 of the steel container, fly ash and asphalt;

[0067] Spread a 45cm x 45cm plastic film on the surface of the test bench, then turn the steel container upside down on the surface of the plastic film, remove the asphalt layer specimen with fly ash adhered to the surface, and use a brush to brush off the fly ash not adhered to the asphalt surface onto the plastic film. Then, use an electronic scale to weigh the total mass M3 of the asphalt layer and the fly ash adhered to its surface;

[0068] The asphalt layer adhered to the fly ash was placed in a constant temperature box at 5-10°C for 6-12 hours, then placed on a clean laboratory bench. A long stainless steel cutter at a temperature of 60-90°C was used to cut the asphalt layer specimen into three strips of 5cm×15cm×1cm or 3cm×10cm×1cm, completing the preparation of the waste incineration fly ash particle-asphalt binder specimen.

[0069] The xy coordinate system is established with the length of the cross section of the waste incineration fly ash particles-asphalt binder specimen as the x-axis and the thickness as the y-axis (the direction from the waste fly ash layer to the asphalt layer is the positive direction of the y-axis) (see Figure 2 ); The distribution morphology of the fly ash particles in the cross section of the waste incineration fly ash particle-asphalt binder specimen was observed using an electron microscope, and the particle positions with the maximum and minimum migration distances were marked, thereby determining the upper limit d1 and lower limit d2 of the migration distance. Subsequently, the migration distance d of a single waste incineration fly ash particle-asphalt binder specimen was calculated according to the following formula: opti (mm):

[0070] d opt =(d1+d2) / 2

[0071] Where: d1 is the upper limit of the migration distance (mm), which is defined as the vertical distance from the particle position with the maximum migration distance to the x-axis; d2 is the lower limit of the migration distance (mm), which is defined as the vertical distance from the particle position with the minimum migration distance to the x-axis, <d1。

[0072] According to the relative positions of different particles and the maximum migration macro-particles (or minimum migration macro-particles), most of the waste incineration fly ash particles are plotted on the coordinate axis in the xy coordinate system according to the parallel line drawing method to complete the distribution morphology curve of the waste incineration fly ash particles (see Figure 3 ).

[0073] The electronic scale is used to control the mass to ensure that the asphalt pouring thickness is 1cm±1mm. Specifically, for a steel container with a size of 15cm×15cm×5cm, the mass needs to be controlled to be 270g±1g; for a steel container with a size of 10cm×10cm×5cm, the mass needs to be controlled to be 120g±1g.

[0074] The material of the steel container can be medium carbon structural steel with the steel grade of S45C, S41C, or S50C; pre-hardened mold steel with the steel grade of P20, 711, 2311, or 42CrMnMoV can also be selected;

[0075] The pore size of the qualitative filter paper can be selected from 10-120 μm (fast), 5-30 μm (medium speed), or 1-3 μm (slow speed); its specifications can be selected from square filter paper of 60 cm × 60 cm or 30 cm × 30 cm, or circular filter paper with a diameter of 25 cm or 30 cm;

[0076] The brush is a flat-head paint brush, the size of which can be 1 inch (25mm), 2 inches (50mm), or 3 inches (75mm), and the material can be pig hair, wool, or elastic silk;

[0077] The release agent can be an emulsion type AR asphalt release agent or an HZ type asphalt release agent;

[0078] The plastic film can be polyethylene film, polypropylene film, polyvinyl chloride film, or polyester film, and the thickness of the film should be 30-50 mm.

[0079] The cross section of the waste incineration fly ash particle-asphalt binder specimen refers to a plane with a size of 15 cm×1 cm or 10 cm×1 cm.

[0080] In a method for preparing and evaluating a waste incineration fly ash and asphalt binder specimen provided in an embodiment of the present invention, the unit fly ash adhesion mass value α, adhesion rate β and intrusion micro-distance d of the waste incineration fly ash particle-asphalt binder specimen are defined and analyzed. q , conduct preliminary evaluation and re-evaluation of the adhesion of the interface between waste incineration fly ash particles and asphalt, specifically:

[0081] The adhesion of the two is evaluated by using the mass parameters of fly ash adhered to the asphalt and the geometric parameters of fly ash intrusion into the asphalt. The mass value of fly ash adhered to the asphalt is α and the adhesion rate β as the evaluation index; the geometric parameters of fly ash intrusion into the asphalt are the micro-distance d. q As an evaluation indicator.

[0082] The unit fly ash adhesion mass value α is defined as the mass of fly ash adhered to the surface and interior of asphalt per unit asphalt mass, and its calculation formula is as follows:

[0083] α=(M1+M3-M2) / (M2-M1)

[0084] Where: α is the unit fly ash adhesion mass value (g / g); M1 is the total mass of the steel container and the fly ash inside it (g); M2 is the total mass of the steel container, fly ash and asphalt (g); M3 is the total mass of the asphalt layer and the waste incineration fly ash adhered to its surface (g).

[0085] The adhesion rate β is defined as the percentage (%) of the mass of adhered waste incineration fly ash to the total mass of fly ash in the steel container, and is calculated as follows:

[0086] β=(M1+M3-M2)*100% / (M1-M0)

[0087] Where: β is the adhesion rate (%); M0 is the mass of the steel container (g); M1 is the total mass of the steel container and the fly ash inside it (g); M2 is the total mass of the steel container, fly ash and asphalt (g); M3 is the total mass of the asphalt layer and the waste incineration fly ash adhered to its surface (g).

[0088] The intrusion macro d q It is defined as the actual distance that fly ash from garbage incineration penetrates into the asphalt binder. The calculation formula is as follows:

[0089]

[0090] Where: d q is the intrusion distance (mm); d opti is the migration distance (mm) of the waste incineration fly ash particle-asphalt binder specimen.

[0091] According to Tables 1 and 2, the adhesion of the interface between the waste incineration fly ash particles and the asphalt binder in specimens of different sizes was initially evaluated and re-evaluated.

[0092] When the unit fly ash adhesion mass value α, adhesion rate β, intrusion distance d q When the limit value of grade D or grade C is met, the preliminary evaluation of the adhesion of the interaction interface of the waste incineration fly ash particles and asphalt mortar specimens is completed, and the evaluation grade is the preliminary evaluation result of the adhesion of the interaction interface of the specimens;

[0093] When the initial evaluation result is A or B, it is necessary to prepare a waste incineration fly ash plane-asphalt mortar specimen for further re-evaluation.

[0094] Table 1 Test mold initial evaluation index limit and classification table (15cm×15cm×5cm)

[0095] Evaluation level Unit adhesion mass (g / g) Adhesion rate (%) Intrusion macro distance (mm) Whether to re-evaluate D <0.13 <2.90 <0.5mm no C 0.13-0.22 2.9-4.1 0.5mm-1mm no B 0.22-0.45 4.1-9.7 1mm-1.5mm yes A >0.45 >9.7 >1.5mm yes

[0096] Table 2 Test mold initial evaluation index limit and classification table (10cm×10cm×5cm)

[0097] Evaluation level Unit adhesion mass (g / g) Adhesion rate (%) Intrusion macro distance (mm) Whether to re-evaluate D <0.051 <1.21 <0.5mm no C 0.051-0.091 1.21-2.11 0.5mm-1mm no B 0.091-0.199 2.11-4.27 1mm-1.5mm yes A >0.199 >4.27 >1.5mm yes

[0098] In a method for preparing and evaluating waste incineration fly ash and asphalt binder specimens provided in an embodiment of the present invention, continuous and discontinuous groups of waste incineration fly ash plane-asphalt binder specimens are prepared, specifically:

[0099] Use an electronic balance to weigh an appropriate amount of waste incineration fly ash (particle size < 0.3 mm) and transfer it to a steel square plate with dimensions of 21 cm × 45 cm × 11 cm;

[0100] Pour deionized water of EW-IV quality into the steel square tray to soak all the fly ash powder and wash it with water;

[0101] Use qualitative filter paper to filter the washed waste incineration fly ash, place it in a clean container, and then transfer it to a preheated drying oven and dry it at 110℃ for 24-36 hours;

[0102] Select a steel detachable container with a size of 15cm×15cm×20cm or 10cm×10cm×15cm, and use a brush to apply a layer of release agent with a thickness of about 1mm on the side wall of the container;

[0103] For steel detachable containers with a size of 15cm×15cm×20cm, the fly ash from the incineration plant should be spread in four layers. For steel containers with a size of 10cm×10cm×15cm, the fly ash from the incineration plant should be spread in three layers from the center to the periphery in a clockwise direction, with a thickness of 5cm each time.

[0104] Each time the paving thickness of the waste incineration fly ash reaches 5 cm, add 10 g of epoxy resin-curing agent mixture diluted with alcohol (alcohol is 10% of the mass of the mixture);

[0105] Use a stirring rod to mix and compact the mixture, and then use a 5cm×5cm square hammer to further compact the mixture.

[0106] Use a scraper to scrape off the fly ash adhesive material that exceeds the surface of the steel container, and place the container in a 60℃ constant temperature box to dry at a constant temperature for 6-11 hours;

[0107] Disassemble the steel container and take out the test piece. Place the waste incineration fly ash test piece on a clean laboratory table with a square bottom surface (15 cm × 15 cm or 10 cm × 10 cm).

[0108] The top surface and four side surfaces were properly polished with sandpaper, and then the polished surface of the test block was coated with waste incineration fly ash powder (particle size <0.3 mm) to complete the preparation of the waste incineration fly ash test block;

[0109] Place the waste incineration fly ash specimen on the test bench and slowly pour molten asphalt heated to 160°C in a clockwise direction from the center of the top surface of the specimen to the surrounding areas. Stop pouring asphalt after the asphalt self-levels and covers the surface of the waste incineration fly ash specimen (except for the bottom, which is completely covered with asphalt);

[0110] The waste incineration fly ash test block was left to stand at room temperature for 3-5 hours, and then a preheated flat scraper was used to cut off the excess asphalt that was bonded to the test bench at the bottom along the asphalt layer on the surface of the test block, completing the asphalt coating and pouring of the waste incineration fly ash test block;

[0111] Measure 5 cm upward from the bottom of the asphalt-coated test block and mark it with a flat scraper. Then fix the specimen to the cutting instrument and cut it according to the marked position. After cutting, use a brush to brush off the cutting debris at the bottom of the upper test block (size 15 cm × 15 cm × 15 cm or 10 cm × 10 cm × 10 cm), and use sandpaper to properly polish the bottom surface to keep the surface smooth, completing the preparation of a continuous group of waste incineration fly ash-asphalt binder specimens.

[0112] Based on the aforementioned method for preparing continuous group waste incineration fly ash-asphalt binder specimens, a preheated flat scraper is used to completely cut the asphalt at the boundary between the side surface and the top surface along the top surface of the specimen, and at the same time, the asphalt at the boundary between the four side surfaces is cut to complete the non-continuous group of waste incineration fly ash plane-asphalt binder specimens.

[0113] For the continuous and discontinuous groups of waste incineration fly ash plane-asphalt binder specimens, epoxy resin adhesive was used to evenly apply the waste incineration fly ash surface at the bottom of the specimen (the side asphalt section should be prevented from contacting the adhesive during application), and fixed on a 50kg steel base for subsequent bonding strength tests and shear strength tests.

[0114] The material of the detachable container is P20 medium carbon alloy steel, and the material can also be medium carbon structural steel with steel grade S45C, S41C, or S50C; pre-hardened mold steel with steel grade P20, 711, or 2311 can also be selected; or medium carbon alloy steel with steel grade P20, 711, 2311, or 2731 can be selected;

[0115] The epoxy resin is diphenol propane glycidyl ether, and its density is 1.17g / cm 3, melting point is 40-44 ℃, molar refractive index is 95.44, surface tension is 5.6 (dyne / cm); its model can be selected from E42 (634) type with epoxidation value of 0.31-0.45eq / 100g, organic chlorine ≤0.02mol / g, inorganic chlorine ≤0.001mol / g; or E35 (637) type with epoxidation value of 0.30-0.40eq / 100g, organic chlorine ≤0.02mol / g, inorganic chlorine ≤0.005mol / g; E44 (6101) type with epoxidation value of 0.41-0.47eq / 100g, organic chlorine ≤0.02mol / g, inorganic chlorine ≤0.001mol / g can also be selected;

[0116] The curing agent is trimethylhexamethylenediamine TMD, which has a density of 0.17g / cm 3 , melting point is -10℃, boiling point is 232℃, refractive index is 1.4640-1.4660, acidity coefficient is 10.36±0.25 (20℃), polarizability is 20.11; diethylaminopropylamine DEAPA can also be used, its density is 0.126g / cm 3 , the acidity coefficient is 10.32±0.25 (Predicted), the pH value is 11.7 (10g / l, H2O, 20℃), and the refractive index is 1.4406-1.4426; the ratio of the epoxy resin-TMD mixture is 100 parts of epoxy resin + 21 parts of trimethylhexamethylenediamine TMD, and the curing conditions are 1h-10℃ (first), 2h-150℃ (later); the ratio of the epoxy resin-DEAPA mixture is 100 parts of epoxy resin + 4-1 parts of trimethylhexamethylenediamine TMD, and the curing conditions are 4h-60~70℃;

[0117] The sandpaper is 120 mesh dry sandpaper, and its model can also be selected from 60 mesh or 110 mesh;

[0118] The top surface and four side surfaces are polished with sandpaper to increase the roughness of the surface of the test block;

[0119] The purpose of applying the powdery material of fly ash from garbage incineration to the polished surface is to prevent the resin binder from being exposed;

[0120] The cutting instrument is a CNC laser cutting machine with a working width of 60cm×25cm and a working power of 1000W;

[0121] The purpose of completely cutting off the asphalt at the boundary between the side and top surface and the asphalt at the boundary between the four side surfaces is to ensure that the asphalt on each surface is not connected to the asphalt on any other surface and is in a state of independent bonding with the waste incineration fly ash test block.

[0122] In a method for preparing and evaluating waste incineration fly ash and asphalt binder specimens provided in an embodiment of the present invention, a bonding strength test is performed on the waste incineration fly ash plane-asphalt binder specimen to determine the bonding strength stability value Φ, specifically:

[0123] Three non-continuous groups of waste incineration fly ash flat surface-asphalt binder specimens and six continuous groups of waste incineration fly ash flat surface-asphalt binder specimens were prepared; the pull head was bonded to the asphalt surface of the specimen using epoxy resin adhesive. After the adhesive was fully cured, the specimen was installed in the tensile fixture of the tensile bond strength tester; the tester was started, and the load was applied at a tensile speed of 25 mm / min. The test was stopped immediately when the specimen was damaged, and the bonding strength value at this time was recorded.

[0124] Specifically, the test requirements for non-continuous and continuous groups of MSW incineration fly ash flat surface-asphalt binder specimens are as follows:

[0125] For three non-continuous groups of waste incineration fly ash flat surface-asphalt binder specimens, the pull-out head was bonded to the five asphalt surfaces of a single specimen; 5 non-continuous bond strengths Φ were obtained for each specimen. 非连续i , a total of 15 discontinuous bond strengths Φ were obtained for the three specimens 非连续i ; Calculate the average discontinuous bond strength Φ according to the following formula 非连续 :

[0126]

[0127] For 6 consecutive groups of waste incineration fly ash plane-asphalt binder specimens, 3 specimens were randomly selected and the pull-out head was bonded to the top surface of a single specimen in turn, and a total of 3 top surface continuous bonding strengths Φ were obtained. 顶面连续i ; The remaining three specimens were bonded with the pull-out head and one side of a single specimen (selected arbitrarily) in turn, and a total of three side continuous bonding strengths Φ were obtained 侧面连续i ; Calculate the average continuous bond strength Φ according to the following formula 连续 :

[0128]

[0129] Finally, the bond strength stability value Φ of the waste incineration fly ash plane-asphalt binder specimen was calculated according to the following formula:

[0130] Φ=aΦ 连续 +bΦ 非连续

[0131] Where: Φ is the stable value of the bonding strength between the waste incineration fly ash plane and the asphalt binder specimen; Φ 连续 is the average bonding strength of the continuous waste incineration fly ash plane-asphalt binder specimens; Φ 非连续is the average bonding strength of the discontinuous waste incineration fly ash plane-asphalt binder specimen; a is the continuous bonding strength stability ratio parameter, ranging from 0.64 to 0.77; b is the discontinuous bonding strength stability ratio parameter, ranging from 0.23 to 0.36, and parameter a+b=1; when the average discontinuous bonding strength Φ 非连续 Average value of continuous bonding strength with top surface Φ 连续 If the difference is greater than 0.04 MPa, a is taken as 0.77; if the difference is less than 0.01 MPa, a is taken as 0.64.

[0132] The technical parameters of the tensile bond strength tester are: measuring range 0-10KN, minimum indication value 0.001N, tensile speed 1-100mm / min, and pulling stroke 100mm; the same type of pulling test machine can be used;

[0133] The pulling head is a steel M12 standard thread pulling block with a size of 40mm×40mm×10mm, and a size of 50mm×50mm×10mm can also be selected; when the size of the waste incineration fly ash plane-asphalt binder specimen is 10cm×10cm×10cm, a pulling head with a size of 40mm×40mm×10mm should be selected; when the size of the waste incineration fly ash plane-asphalt binder specimen is 15cm×15cm×15cm, a pulling head with a size of 50mm×50mm×10mm should be selected.

[0134] In a method for preparing and evaluating waste incineration fly ash and asphalt binder specimens provided in an embodiment of the present invention, a shear strength test is performed on the waste incineration fly ash plane-asphalt binder specimen to determine the shear strength stability value θ, specifically:

[0135] Prepare three non-continuous groups of waste incineration fly ash flat surface-asphalt binder specimens and three continuous groups of waste incineration fly ash flat surface-asphalt binder specimens; fix the specimens in the fixture of the universal testing machine, then rotate the specimen so that the shear surface is parallel to the movement direction of the shear head, and adjust the fixture so that the point of action of the shear force falls as much as possible on the shear surface (such as Figure 4 Set the load speed to 15 mm / min, start the equipment and perform a shear test on the specimen. The maximum shear strength when the specimen is destroyed is taken as the test result.

[0136] For three non-continuous groups of waste incineration fly ash flat surface-asphalt binder specimens, shear strength tests were conducted on five asphalt-covered surfaces; five non-continuous shear strengths θ were obtained for each specimen. 非连续i , a total of 15 discontinuous shear strengths θ were obtained for the three specimens 非连续i ; Calculate the average discontinuous shear strength θ according to the following formula 非连续 :

[0137]

[0138] For three consecutive groups of MSW incineration fly ash plane-asphalt binder specimens, only the top surface of the specimens needs to be tested for shear strength, and a total of three top surface continuous shear strengths θ 顶面连续 ; Calculate the average continuous shear strength θ according to the following formula 连续 :

[0139]

[0140] Finally, the shear strength stability value θ of the waste incineration fly ash plane-asphalt binder specimen was calculated according to the following formula:

[0141] θ=aθ 连续 +bθ 非连续

[0142] Where: θ is the shear strength stability value; θ 连续 is the average value of continuous shear strength; θ 非连续 is the average value of discontinuous shear strength; c is the stable ratio parameter of continuous shear strength, ranging from 0.59 to 0.72; d is the stable ratio parameter of discontinuous shear strength, ranging from 0.21 to 0.41, and parameter c+d=1, when the average value of discontinuous shear strength θ 非连续 and the average value of continuous shear strength θ 连续 If the difference is greater than 0.003 MPa, a is taken as 0.72; if the difference is less than 0.0009 MPa, a is taken as 0.59.

[0143] The technical parameters of the universal testing machine are: a stroke of 910 mm (excluding the fixture), an effective width of 360 mm, a test speed of 0.1-500 mm / min, and a displacement resolution of 0.01 mm. A universal testing machine of the same type that supports shear testing can also be used.

[0144] In a method for preparing and evaluating waste incineration fly ash and asphalt binder specimens provided in an embodiment of the present invention, the adhesion of the contact interface between the waste fly ash particle plane and the asphalt is re-evaluated, specifically:

[0145] According to Tables 3 and 4, the adhesion of the contact interface between the waste incineration fly ash plane and the asphalt binder specimens of different sizes was re-evaluated, and the evaluation grade was the adhesion re-evaluation result of the specimen contact interface.

[0146] Table 3 Test piece re-evaluation index limit and classification table (15cm×15cm×15cm)

[0147] Evaluation level Bond strength stability value (MPa) Shear strength (MPa) B <0.11 <0.015 B+ 0.11-0.15 0.015-0.02 A 0.15-0.25 0.02-0.026 A+ >0.25 >0.026

[0148] Table 4 Test piece re-evaluation index limit and classification table (10cm×10cm×10cm)

[0149] Evaluation level Bond strength (MPa) Shear strength (MPa) B <0.10 <0.011 B+ 0.10-0.14 0.011-0.015 A 0.14-0.22 0.015-0.021 A+ >0.22 >0.021

[0150] Each step in the above application method has a strict preparation, detection and evaluation sequence, and inappropriate method steps will seriously affect the characterization results.

[0151] The present invention provides a method for preparing and evaluating waste incineration fly ash and asphalt binder specimens, wherein the aforementioned evaluation method specifically comprises the following steps:

[0152] B1. Prepare waste incineration fly ash particle-asphalt binder specimens and characterize the distribution morphology of waste incineration fly ash particles in the specimens;

[0153] B2. Define and analyze the unit fly ash adhesion mass value α, adhesion rate β, and intrusion distance d of the waste incineration fly ash particle-asphalt binder specimen q , conduct preliminary evaluation and re-evaluation of the adhesion of the interactive interface between waste incineration fly ash particles and asphalt;

[0154] B3. Conduct a preliminary evaluation of the MSW incineration fly ash particle-asphalt binder specimens to clarify the adhesion between the MSW incineration fly ash particles and the asphalt binder interface. A re-evaluation is then conducted. If the re-evaluation requirements are met, proceed to the next steps; otherwise, the evaluation is terminated.

[0155] B4. Prepare continuous and discontinuous groups of waste incineration fly ash flat surface-asphalt binder specimens; conduct bond strength and shear strength tests on the waste incineration fly ash flat surface-asphalt binder specimens to determine the bond strength stability value Φ and the shear strength stability value θ;

[0156] B5. Re-evaluate the adhesion of the contact interface between the surface of the fly ash particles and the asphalt to clarify the adhesion of the contact interface between the surface of the fly ash particles and the asphalt binder.

[0157] Example 1

[0158] A method for preparing and evaluating waste incineration fly ash and asphalt binder specimens, the specific steps are as follows:

[0159] Step B1. Prepare a waste incineration fly ash particle-asphalt binder specimen and characterize the distribution morphology of the waste incineration fly ash particles in the specimen.

[0160] A certain amount of waste incineration fly ash is taken out from the waste incineration fly ash storage device using a stainless steel spoon, and placed in the mixing pot of the powder mixer, and the waste incineration fly ash is stirred and mixed at a stirring rate of 300-500 rad / min for 5-10 minutes;

[0161] After sufficient stirring, use a stainless steel spoon to take out the fly ash from the mixing pot and transfer it to a clean container for later use;

[0162] Weigh 400g of waste incineration fly ash using an electronic balance with an accuracy of 0.1g, then use a 0.6mm aggregate sieve to screen the waste incineration fly ash powder material with a particle size of less than 0.6mm, and place it in a clean container for later use;

[0163] Deionized water of EW-IV quality level is slowly injected along the inner wall of the container to fully soak the waste incineration fly ash powder material and then wash it with water;

[0164] Use medium-speed square qualitative filter paper with a pore size of 5-30μm to filter the waste incineration fly ash. Place the filtered powdery material in another clean container. Then place the waste incineration fly ash powdery material and the container in a drying oven and dry them at 110℃ for 30h.

[0165] A medium-carbon structural steel S50C with dimensions of 10 cm × 10 cm × 5 cm was selected as the specimen preparation container. A small amount of release agent was applied using a 2-inch wool flat-head paint brush. A layer of HZ asphalt release agent with a thickness of 2 mm was applied to the side wall of the container according to the principle of applying small amounts multiple times. The weight of the steel container, M0, was measured using an electronic scale. M0 = 1665.3 g.

[0166] Spread the fly ash evenly in the steel container to a thickness of 2 cm. Use a 0.1 mm precision steel ruler to ensure that the distance between any five points on the surface of the fly ash and the upper surface of the steel container is no more than 3 cm ± 1 mm. Then use an electronic scale to weigh the total mass of the steel container and the fly ash, M1 = 2065.3 g.

[0167] Heat the base asphalt to 160°C and then divide it into four clean beakers;

[0168] Place the steel container filled with fly ash on an electronic scale, then slowly pour asphalt from four beakers at the four corners of the steel container. Stop pouring asphalt when the mass increases by 120g.

[0169] The steel container was placed in a ventilated place for 10 hours, and then the total mass M2 of the steel container, fly ash and asphalt was weighed using an electronic scale, M2 = 2115.3 g;

[0170] Spread a 45cm×45cm polyethylene film (45 filaments) on the surface of the test bench, then turn the steel container upside down on the polyethylene film surface and take out the asphalt layer specimen with fly ash adhered to the surface;

[0171] Use a brush to brush off the fly ash not adhering to the asphalt surface onto the polyethylene film, and then use an electronic scale to weigh the total mass M3 of the asphalt layer and the garbage fly ash adhering to the surface, M3 = 211.4g;

[0172] The asphalt layer with fly ash adhered to it was placed in a constant temperature box at 1°C for 7 hours, then placed on a clean laboratory bench. A long stainless steel cutter at 10°C was used to cut the asphalt layer specimen into three strips of 3 cm × 10 cm × 1 cm (the remaining narrow strips were placed in a waste recycling bin), completing the preparation of the waste incineration fly ash particle-asphalt binder specimen.

[0173] The distribution morphology of fly ash particles in the cross section of the waste incineration fly ash particles-asphalt binder specimen was collected using an electron microscope.

[0174] The xy coordinate system is established with the length of the cross section of the waste incineration fly ash particles-asphalt binder specimen as the x-axis and the thickness as the y-axis (the direction from the waste fly ash layer to the asphalt layer is the positive direction of the y-axis) (see Figure 2 );

[0175] The particle positions of the maximum and minimum migration distances were recorded by dot marking in the real-time image analysis system supporting the microscope. A perpendicular line was drawn to the x-axis with the maximum migration distance point (or the minimum migration distance point) as the origin, and the length of the perpendicular line was determined to be the upper limit value d1 of the migration distance (or the lower limit value d2 of the migration distance), where d1>d2. The measured values ​​are shown in Table 5.

[0176] According to the relative positions of different waste incineration fly ash particles and the maximum migration macro-particles (or minimum migration macro-particles), most of the waste incineration fly ash particles are plotted on the coordinate axis in the xy coordinate system according to the parallel line drawing method to complete the distribution morphology curve of the waste incineration fly ash particles (see Figure 3 ).

[0177] According to the following formula, calculate the migration distance d of three parallel specimens opti , the results are shown in Table 5.

[0178] d opti =(d1+d2) / 2

[0179] Specifically, the waste incineration fly ash is the incineration fly ash from the Dongguan Environmental Protection Industrial Waste Treatment Station, and the matrix asphalt is Shell's 70# matrix asphalt.

[0180] Specifically, the brush is a 2-inch pig hair flat-head paint brush.

[0181] Specifically, the electron microscope is a Hypei MF-U176-402 high-magnification measuring microscope produced by Mitutoyo of Japan, with a measuring range of 250*150*150mm (X*Y*Z), a resolution of 0.01μm, an XY axis accuracy of (0.9+3L / 1000)μmL, a Z axis accuracy of (1.5+10L / 1000)μmL, and a chain cross-line graticule (line width of 5μm).

[0182] Table 5 Geometric parameters of waste incineration fly ash particles-asphalt binder specimens

[0183] Specimen number <![CDATA[Migration macro limit value d1 (mm)]]> <![CDATA[Lower limit value of migration macro d2 (mm)]]> <![CDATA[Migration macro d opti (mm) <!-- 13 -->]]> 1 7.3 2.1 4.7 2 12.1 3.7 7.9 3 1.2 3.4 4.1

[0184] Step B2. Define and analyze the unit fly ash adhesion mass value α, adhesion rate β and intrusion distance d of the waste incineration fly ash particle-asphalt binder specimen q , and conduct preliminary evaluation and re-evaluation of the adhesion of the interactive interface between waste incineration fly ash particles and asphalt.

[0185] The unit fly ash adhesion mass value α is defined as the mass value of garbage fly ash adhered to the asphalt surface and interior per unit asphalt mass α (g / g). The unit fly ash adhesion mass value α is calculated according to the following formula, and the results are shown in Table 6.

[0186] α=(M1+M3-M2) / (M2-M1)

[0187] In the formula: M1 is the total mass of the steel container and the fly ash inside it, M1 = 2065.3g; M2 is the total mass of the steel container, fly ash and asphalt, M2 = 2115.3g; M3 is the total mass of the asphalt layer and the garbage fly ash adhered to its surface, M3 = 211.4g.

[0188] The adhesion rate β is defined as the percentage (%) of the mass of adhered garbage fly ash to the total mass of fly ash in the steel container. The adhesion rate β is calculated according to the following formula, and the results are shown in Table 6.

[0189] β=(M1+M3-M2)*100% / (M1-M0)

[0190] In the formula: M0 is the mass of the steel container, M0 = 1665.3g.

[0191] Invasion Macro d q It is defined as the actual distance that the fly ash from garbage incineration penetrates into the asphalt binder. The adhesion rate β is calculated according to the following formula. The results are shown in Table 6.

[0192]

[0193] Table 6 Calculated values ​​and evaluation results of preliminary evaluation indicators of waste incineration fly ash particles-asphalt binder specimens

[0194] Unit adhesion mass a(g / g) Adhesion rate β(%) <![CDATA[Invasive macro distance d q (mm)]]> Evaluation level Whether to re-evaluate 0.12 24.6 6.13 A yes

[0195] As shown in Table 6, the unit adhesion mass a of the specimen with a size of 10 cm × 10 cm × 5 cm is 0.12 (g / g) (> 0.199), the adhesion rate β is 24.6% (> 4.27%), and the intrusion micro distance d is q If the thickness of the surface of the fly ash particles is 6.13 mm (>1.5 mm), the adhesion of the interaction interface between the fly ash particles and the asphalt binder is rated as Class A. Since it meets the re-evaluation requirements, it is necessary to prepare a fly ash plane-asphalt binder specimen for further re-evaluation.

[0196] Step B3. Prepare continuous and discontinuous groups of waste incineration fly ash plane-asphalt binder specimens.

[0197] 3000 g of MSW incineration fly ash (particle size < 0.3 mm) was weighed using an electronic balance and sieved using a 0.3 mm aggregate sieve. The fly ash that passed the 0.3 mm aggregate sieve was placed on a steel square pan with dimensions of 21 cm × 45 cm × 11 cm.

[0198] Pour deionized water of EW-IV quality into the steel square tray to soak all the fly ash powder and wash it with water;

[0199] The washed waste incineration fly ash was filtered using a slow square qualitative filter paper with a size of 30 cm × 30 cm and collected in a clean container. The container was then placed in a preheated drying oven and dried at 110°C for 30 hours.

[0200] A 711# pre-hardened die steel with a size of 10cm×10cm×15cm was selected as the detachable container of the test piece, and a layer of HZ type asphalt isolation agent with a thickness of about 1mm was applied to the side wall of the container using a 2-inch wool flat-head paint brush.

[0201] Select E42 (634) type diphenol propane glycidyl ether as epoxy resin and trimethyl hexamethylene diamine TMD as curing agent, weigh 22.5g of E42 (634) type diphenol propane glycidyl ether and 4.7g of trimethyl hexamethylene diamine curing agent according to the ratio of 100 parts of epoxy resin + 21 parts of TMD, and place them in different beakers respectively; tilt a glass rod on the inner wall of the beaker containing epoxy resin, and then slowly pour the curing agent into the epoxy resin beaker along the glass rod with the tip of the beaker containing curing agent; stir the epoxy resin-curing agent mixture evenly in a clockwise direction for 12 times; place the mixture in a 10°C oven for curing for 1h, and then transfer it to a 150°C oven for curing for 2h;

[0202] Weigh 2.7g of alcohol using an electronic scale. Slowly pour the alcohol into the epoxy resin-curing agent mixture along an inclined glass rod. Stir the mixture evenly in a clockwise direction 12 times to prepare 30g of the epoxy resin-curing agent mixture.

[0203] Divide the waste incineration fly ash into three equal parts, and spread the first layer of waste incineration fly ash from the center to the inner wall of the container in a clockwise direction. Use a steel ruler to control the distance between any five points on the surface of the waste incineration fly ash and the top surface of the container to be 10 cm ± 0.1 mm. Then add 10g of the epoxy resin-curing agent mixture; use a stirring rod to perform preliminary uniform mixing and tamping to compact it, and then use a 5cm×5cm square hammer to further tamp it to complete the paving of the first layer of waste incineration fly ash; repeat the above steps to complete the paving of the second and third layers of waste incineration fly ash;

[0204] Use a scraper to scrape off the fly ash adhesive material that exceeds the surface of the container, and place the container in a constant temperature box at 60℃ to dry for 12 hours;

[0205] Disassemble the steel container and take out the test specimen, and place the specimen in such a way that its square bottom surface contacts the surface of the test bench;

[0206] The top surface and four sides of the specimen were properly polished using 120-grit dry sandpaper, and then the polished specimen surface was coated with waste incineration fly ash powder (particle size <0.3 mm) to complete the preparation of the waste incineration fly ash specimen;

[0207] Place the waste incineration fly ash test block on a test bench coated with HZ type asphalt release agent. Then, slowly pour molten asphalt heated to 160°C in a clockwise direction from the center of the top surface of the test block to the surrounding areas. Stop pouring asphalt after the self-leveling asphalt covers the surface of the test block (except for the bottom, which is completely covered with asphalt).

[0208] The waste incineration fly ash test piece was left to stand at room temperature for 3.5 hours, and then a flat scraper at a temperature of 90°C was used to remove the excess asphalt that was bonded to the test bench from the bottom along the asphalt layer on the surface of the test piece.

[0209] Use a steel ruler to measure 5 cm upwards from the bottom of the asphalt-coated test block and use a flat scraper to cut and mark it. Then fix the test block on the laser cutting instrument and cut it according to the marked position. The cut upper test block is used as the test block for subsequent tests.

[0210] A brush was used to remove the cutting debris at the bottom of the upper test block, and the bottom surface was properly polished with 110-mesh dry sandpaper to keep the surface smooth, completing the preparation of a continuous group of waste incineration fly ash-asphalt binder specimens.

[0211] According to the preparation method of continuous batch waste incineration fly ash-asphalt binder specimens, 15 specimens were prepared for use;

[0212] Randomly select 6 continuous groups of waste incineration fly ash-asphalt binder specimens, use a flat scraper at a temperature of 90°C to completely cut the asphalt at the junction of the side surface and the top surface along the top surface of the specimen, and at the same time cut the asphalt at the junction between the four side surfaces, completing the preparation of 6 non-continuous groups of waste incineration fly ash flat surface-asphalt binder specimens;

[0213] Use epoxy resin adhesive to smear the bottom of all waste incineration fly ash flat surface-asphalt binder specimens (not covered with asphalt, and avoid the side asphalt section from contacting the adhesive during smearing), and then fix the specimens on a 50kg steel base.

[0214] Steps B4 and B5. Conduct bonding strength tests and shear strength tests on the waste incineration fly ash plane-asphalt binder specimens to determine the bonding strength stability value Φ and the shear strength stability value θ; and re-evaluate the adhesion of the contact interface between the waste fly ash particle plane and the asphalt.

[0215] The prepared waste incineration fly ash flat surface-asphalt binder specimens were divided into a bonding strength test group and a shear strength test group. The bonding strength test group included 3 non-continuous groups of waste incineration fly ash flat surface-asphalt binder specimens and 6 continuous groups of waste incineration fly ash flat surface-asphalt binder specimens. The shear strength test group included 3 non-continuous groups of waste incineration fly ash flat surface-asphalt binder specimens and 3 continuous groups of waste incineration fly ash flat surface-asphalt binder specimens.

[0216] Conduct a bonding strength test on the bonding strength test group and determine the bonding strength stability value Φ, specifically:

[0217] For three non-continuous groups of waste incineration fly ash plane-asphalt binder specimens, diphenol propane glycidyl ether was used to bond the pull head to the five asphalt surfaces of the specimens. After the adhesive was fully cured, the specimens were installed in the tensile fixture of the tensile bond strength tester. The tester was started and the load was applied at a tensile speed of 5 mm ± 1 min. The test was stopped immediately when the specimen was damaged, and the non-continuous bond strength Φ at this time was recorded. 非连续i ; After completing 3 parallel tests, calculate the average value of discontinuous bonding strength Φ 非连续 , the test values ​​and calculated values ​​are shown in Table 7;

[0218] For six consecutive groups of waste incineration fly ash flat surface-asphalt binder specimens, diphenol propane glycidyl ether was used to bond the pulled heads to the top surfaces of any three specimens. For the remaining three specimens, the pulled heads were bonded to one side surface (selected at random) of a single specimen in turn. After the adhesive was fully cured, the specimens were installed in the tensile fixture of the tensile bond strength tester. The tester was started and a load was applied at a tensile speed of 5 mm ± 1 min. The test was stopped immediately when the specimen was damaged, and the continuous bond strength Φ at this time was recorded. 顶面连续i (or Φ 侧面连续i ); after completing 6 tests, calculate the average value of continuous bonding strength Φ 连续 , the test values ​​and calculated values ​​are shown in Table 7.

[0219] Table 7 Test and calculated values ​​of bond strength of waste incineration fly ash plane-asphalt binder specimens (MPa)

[0220]

[0221] As shown in Table 7, Φ 连续 0.21MPa, Φ 非连续 The difference between the two is 0.05MPa (>0.04MPa). Therefore, the continuous bonding strength stability ratio parameter a is taken as 0.77, and the discontinuous bonding strength stability ratio parameter b is 0.23. According to the bonding strength stability value Φ calculation formula: Φ=aΦ 连续 +bΦ 非连续 , and we obtain Φ=0.20Mpa.

[0222] Conduct a shear strength test on the shear strength test group and determine the shear strength stability value θ, specifically:

[0223] Fix the waste incineration fly ash plane-asphalt binder specimen in the fixture of the universal testing machine, then rotate the fixture so that the shear surface of the specimen (the contact interface between the asphalt and the waste fly ash) is parallel to the movement direction of the shear head of the equipment (vertically downward), and fine-tune the position of the fixture so that the shear surface of the specimen just contacts the shear head. Then start the equipment and apply a vertical downward shear force to the specimen at a speed of 15mm / min. Stop the test when the asphalt and the waste fly ash are completely separated, and take the shear strength value when the specimen is destroyed as the test result.

[0224] Among them, for the non-continuous group of waste incineration fly ash flat surface-asphalt binder specimens, shear strength tests need to be carried out on the five asphalt-covered surfaces of the specimens; for the continuous group of waste incineration fly ash flat surface-asphalt binder specimens, shear strength tests only need to be carried out on the top surface of the specimens, and the test values ​​are calculated to determine the shear strength stability value of the specimens. The test values ​​and calculated values ​​are shown in Table 1.

[0225] Specifically, the tensile bond strength tester is an LBY-VI tensile bond strength pull-out testing machine, and its technical parameters are as follows: motor power is 200W, stretching space is 150mm, stretching speed is 1-100mm / min, and measuring range is 10KN.

[0226] Specifically, the universal testing machine is the TY1000-B electronic universal testing machine from Jiangsu Tianyuan, and its technical parameters are as follows: stroke is 910 mm (excluding fixtures), effective width is 360 mm, test speed is 0.1-500 mm / min, and displacement resolution is 0.01 mm.

[0227] Table 1 Test and calculated shear strength values ​​of waste incineration fly ash plane-asphalt binder specimens (MPa)

[0228]

[0229] As shown in Table 1, θ 连续 is 0.021MPa, θ 非连续 The difference between the two is 0.007MPa (>0.003MPa). Therefore, the continuous shear strength stability ratio parameter c is 0.72, and the discontinuous shear strength stability ratio parameter b is 0.21. According to the shear strength stability value θ, the calculation formula is: θ = aθ 连续 +bθ 非连续 , and we obtain θ = 0.019Mpa.

[0230] It can be seen that the stable value of the bonding strength of the waste incineration fly ash plane-asphalt binder specimen is Φ = 0.20Mpa (∈(0.14-0.22)), and the stable value of the shear strength is θ = 0.019Mpa (∈(0.015-0.021)). Therefore, the adhesion of the contact interface between the waste incineration fly ash plane and the asphalt binder is rated as Grade A.

[0231] According to Table 1~Table 1 and Figure 2 、 Figure 3 It can be seen that the method for preparing and evaluating waste incineration fly ash and asphalt binder specimens involved in the present invention can achieve an accurate evaluation of the adhesion between waste fly ash and asphalt. By characterizing and quantitatively analyzing the distribution morphology of waste incineration fly ash particles in waste incineration fly ash particles-asphalt binder specimens, an accurate evaluation is made of the adhesion of the interactive interface between waste incineration fly ash particles and asphalt binder; by determining the bonding strength stability value Φ and shear strength stability value θ of the continuous group and discontinuous group waste incineration fly ash plane-asphalt binder specimens, an accurate evaluation is made of the adhesion of the contact interface between the waste incineration fly ash plane and the asphalt binder. This method comprehensively and accurately evaluates the adhesion between waste fly ash and asphalt from the evolution law between fly ash and asphalt in microscopic morphology to the changes in macroscopic mechanical properties, and is significantly innovative.

[0232] As described above, a method for preparing waste incineration fly ash and asphalt binder specimens and evaluating their adhesion provided by the present invention is introduced in detail. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; any simple modifications, changes and equivalent structural changes made to the above embodiments based on the technical essence of the invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. A method for preparing a waste incineration fly ash particle-asphalt binder specimen, characterized in that: The steps include: (1) Place a certain mass of fly ash in a stirring pot and stir the fly ash for 5-10 minutes at a stirring rate of 300-500 rad / min; (2) After uniform mixing, use an electronic balance to weigh an appropriate amount of waste incineration fly ash and pass it through aggregate sieves with mesh sizes of 4.75 mm and 0.6 mm in sequence. The powdery material that passes through the 0.6 mm aggregate sieve is placed in container No. 1, and the fine aggregate that passes through the 4.75 mm sieve but remains on the 0.6 mm aggregate sieve is placed in container No. 2; (3) Pour the fly ash powder material in container No. 1 and the fine aggregate in container No. 2 into clean containers respectively, and inject deionized water for washing; use qualitative filter paper to filter the garbage fly ash, wherein the powder material is placed in the clean container 3 and the fine aggregate is placed in container 4, and then put container 3 and container 4 into a preheated drying oven and dry them at 180℃ for 24-36h; select a steel container with a size of 15cm×15cm×5cm or 10cm×10cm×5cm, use a brush to apply a layer of isolation agent with a thickness of 1mm-3mm on the side wall of the container, and then use an electronic scale to weigh the weight M0 of the steel container; spread the garbage fly ash in container 3 or 4 flat in the steel container with a spreading thickness of 2cm. When spreading, use a steel ruler with an accuracy of 0.1mm to ensure that the distance from any five points on the surface of the garbage incineration fly ash to the upper surface of the steel container is not greater than 3cm±1mm, and then use an electronic scale to weigh the total mass M1 of the steel container and the garbage fly ash; (4) Heat the matrix asphalt to 160-180℃ and divide it into four clean containers; pour asphalt from the four corners of the steel container until the asphalt is leveled and filled on the surface of the garbage fly ash. During pouring, ensure that the asphalt pouring thickness is 1cm±1mm through quality control; place the steel container in a ventilated place for 6-12h, then weigh the total mass M2 of the steel container, garbage fly ash and asphalt, spread a layer of plastic film on the surface of the test bench, then turn the steel container upside down on the surface of the plastic film, take out the asphalt layer specimen with garbage fly ash adhered to the surface, and use a brush to brush off the fly ash not adhered to the asphalt surface to the plastic film, then use an electronic scale to weigh the total mass M3 of the asphalt layer and the garbage fly ash adhered to its surface; (5) The asphalt layer adhering to the fly ash was placed in a constant temperature box at 5-10℃ for 6-12 hours, and then placed on a clean laboratory table. The asphalt layer specimen was cut into three strips with a size of 5cm×15cm×1cm or 3cm×10cm×1cm using a cutter to complete the preparation of the waste incineration fly ash particle-asphalt binder specimen.

2. The method for preparing a waste incineration fly ash particle-asphalt binder specimen according to claim 1, characterized in that: An electronic scale is used to control the mass to ensure that the asphalt pouring thickness is 1cm±1mm. Specifically, for a steel container with a specification of 15cm×15cm×5cm, the asphalt pouring mass is controlled to be 270g±1g; for a steel container with a specification of 10cm×10cm×5cm, the asphalt pouring mass is controlled to be 120g±1g; the cross-section of the waste incineration fly ash particle-asphalt binder specimen refers to a cutting surface with a size of 15cm×1cm or 10cm×1cm.

3. A method for preparing continuous and discontinuous groups of waste incineration fly ash flat-asphalt binder specimens, characterized in that: The steps include: Weigh the required amount of fly ash onto a steel plate and pour in deionized water for washing; filter with filter paper and place in a clean container, then dry in a 180°C drying oven for 24-36 hours; select a detachable steel container with a size of 15cm×15cm×20cm or 10cm×10cm×15cm, and apply a layer of isolation agent with a thickness of about 1mm to the side wall of the container; for a container with a size of 15cm×15cm×20cm, divide the fly ash into 4 times for paving, and for a container with a size of 10cm×10cm×15cm, divide it into 3 times for paving, and each time the paving thickness is 5cm; when the paving thickness of the fly ash reaches 5cm each time, add 10g of epoxy resin-curing agent mixture diluted with alcohol The fly ash is mixed and compacted by tamping; the fly ash exceeding the surface of the container is scraped off, and the container is placed in a 60°C constant temperature oven to dry for 6-18 hours; the container is disassembled and the test piece is taken out, and the fly ash test piece is placed on the laboratory table with the square bottom surface as the contact surface; the top surface and four side surfaces are polished, and then the polished test piece surface is coated with fly ash powder with a particle size of <0.3mm to complete the preparation of the fly ash test piece; the fly ash test piece is placed on the laboratory table, and molten asphalt is slowly and rotationally poured from the center point of the top surface of the test piece to the surrounding area, and the pouring is stopped after the asphalt is leveled and covers the surface of the test piece, so that all surfaces except the bottom are covered with asphalt; Measure 5 cm upwards from the bottom of the asphalt-coated test block and mark the cuts; The specimens were cut using a cutting machine according to the marked positions, and then the cutting debris at the bottom of the upper cut specimen was brushed off and the bottom surface was properly polished to complete the preparation of the continuous group of waste incineration fly ash plane-asphalt binder specimens; Based on the aforementioned preparation method of the continuous group of waste incineration fly ash plane-asphalt binder specimens, a preheated flat scraper is used to completely cut the asphalt at the boundary between the side and top surfaces along the top surface of the specimen, and at the same time, the asphalt at the boundary between the four side surfaces is cut to complete the non-continuous group of waste incineration fly ash plane-asphalt binder specimens.

4. The preparation method according to claim 3, wherein: The surface of the waste incineration fly ash at the bottom of the specimen was evenly coated with epoxy resin adhesive and fixed on a 50kg steel base.

5. The preparation method according to claim 3, wherein: The cutting machine is a CNC laser cutting machine with a working width of 60cm×25cm and a working power of 1000W.

6. A method for evaluating the adhesion between waste incineration fly ash and asphalt binder specimens, characterized in that: The following steps are involved: B1. A waste incineration fly ash particle-asphalt binder specimen prepared by the preparation method according to any one of claims 1-2, characterizing the distribution morphology of the waste incineration fly ash particles in the specimen; B2. Define and analyze the unit fly ash adhesion mass value α, adhesion rate β, and intrusion distance d of the waste incineration fly ash particle-asphalt binder specimen q , conduct preliminary evaluation and re-evaluation of the adhesion of the interactive interface between waste incineration fly ash particles and asphalt; B3. Conduct a preliminary evaluation of the MSW incineration fly ash particle-asphalt binder specimens to clarify the adhesion between the MSW incineration fly ash particles and the asphalt binder interface. A re-evaluation is then conducted. If the re-evaluation requirements are met, proceed to the next steps; otherwise, the evaluation is terminated. B4. Conducting bond strength and shear strength tests on continuous and discontinuous groups of MSW incineration fly ash flat-surface-asphalt binder specimens prepared using the method of any one of claims 3-5 to determine the bond strength stability value Φ and the shear strength stability value θ; B5. Re-evaluate the waste incineration fly ash plane-asphalt binder specimen to clarify the adhesion of the contact interface between the waste incineration fly ash plane and the asphalt binder.

7. The evaluation method of waste incineration fly ash and asphalt binder specimens according to claim 6, characterized in that: Step B2 defines and analyzes the unit fly ash adhesion mass value α, adhesion rate β and intrusion distance d of the waste incineration fly ash particles-asphalt binder specimen q The adhesion of the interface between fly ash particles and asphalt was initially evaluated and re-evaluated. The specific method was as follows: the adhesion of the interface between fly ash and asphalt was evaluated based on the mass parameters of fly ash adhered to asphalt and the geometric parameters of fly ash intrusion into asphalt; The quality parameters of unit asphalt adhesion to waste incineration fly ash include unit fly ash adhesion mass value α and adhesion rate β; The geometric parameter of fly ash intrusion into asphalt is intrusion micro-distance dq; The unit fly ash adhesion mass value α is defined as the mass of the waste incineration fly ash adhered to the asphalt surface and interior per unit asphalt mass, in g / g, and is calculated as follows: α = (M1 + M3 - M2) / (M2 - M1); where M1 is the total mass of the steel container and the fly ash inside it, in g; M2 is the total mass of the steel container, fly ash, and asphalt, in g; M3 is the total mass of the asphalt layer and the waste incineration fly ash adhered to its surface, in g; The adhesion rate β is defined as the percentage of the mass of adhered waste incineration fly ash to the total mass of fly ash in the steel container. The calculation formula is: β = (M1 + M3 - M2) 100% / (M1-M0); where M0 is the mass of the steel container, in g; Invasion Macro d q It is defined as the actual distance that fly ash from garbage incineration penetrates into the asphalt binder. The calculation formula is: ; where d opti is the migration distance of the waste incineration fly ash particles-asphalt binder specimen, in mm; Among them, the xy coordinate system is established with the specimen section length as the x-axis and the thickness as the y-axis. The migration distance upper limit d1 is defined as the distance from the particle position of the maximum migration distance to the vertical line of the x-axis, in mm; The migration distance lower limit d2 is defined as the distance from the particle position of the minimum migration distance to the vertical line of the x-axis, in mm; The migration macro d opti The calculation formula is: opt =(d1+d2) / 2, where d1, d2 and d opti The unit is mm, d1>d2, The mass parameters and geometric parameters are determined according to the above formulas, and the evaluation limits are selected according to the specimen size to evaluate the adhesion of the interaction interface between fly ash particles and asphalt.

8. The evaluation method for waste incineration fly ash and asphalt binder specimens according to claim 6, characterized in that: in, The bonding strength test and shear strength test of the waste incineration fly ash plane-asphalt binder specimens described in step B4 are performed to determine the bonding strength stability value Φ and the shear strength stability value θ. The specific operation is as follows: 6 continuous groups of waste incineration fly ash plane-asphalt binder specimens and 3 discontinuous groups of waste incineration fly ash plane-asphalt binder specimens are prepared as the bonding strength test group, and 3 continuous groups of waste incineration fly ash plane-asphalt binder specimens and 3 discontinuous groups of waste incineration fly ash plane-asphalt binder specimens are prepared as the shear strength test group; Conduct a bonding strength test on the bonding strength test group to determine the bonding strength stability value Φ, specifically: For three non-continuous groups of waste incineration fly ash flat surface-asphalt binder specimens, epoxy resin adhesive was used to bond the pulling head to the five asphalt surfaces of the specimens. After the adhesive was fully cured, the specimens were installed in the fixture of the tester. The tester was started and a load was applied to the specimens. The test was stopped immediately when the specimens were damaged, and the non-continuous bond strength Φ at this time was recorded. 非连续i ; After completing 3 parallel tests, calculate the average value of discontinuous bonding strength Φ 非连续 , the calculation formula is: For six consecutive groups of MSW fly ash flat-asphalt binder specimens, epoxy resin adhesive was used to bond the puller head to the top surface of any three specimens. For the remaining three specimens, the puller head was bonded to any side surface of a single specimen in turn. After the adhesive was fully cured, the specimen was installed in the fixture of the tester. The tester was started and a load was applied to the specimen. The test was stopped immediately when the specimen was damaged, and the continuous bond strength Φ at this time was recorded. 顶面连续i or Φ 侧面连续i ; After completing 6 tests, calculate the average value of continuous bonding strength Φ 连续 , the calculation formula is: The stable value Φ of the bond strength of the waste incineration fly ash plane-asphalt binder specimen is calculated according to the following formula: Φ=aΦ 连续 +bΦ 非连续 Where: Φ is the stable value of the bonding strength between the waste incineration fly ash plane and the asphalt binder specimen; Φ 连续 is the average bonding strength of the continuous waste incineration fly ash plane-asphalt binder specimens; Φ 非连续 is the average bonding strength of the non-continuous waste incineration fly ash plane-asphalt binder specimen; a is the stable ratio parameter of the continuous bonding strength, ranging from 0.64 to 0.77; b is the stable ratio parameter of the discontinuous bonding strength, ranging from 0.23 to 0.36, and parameter a+b=1; when the average discontinuous bonding strength Φ 非连续 Average value of continuous bonding strength with top surface Φ 连续 If the difference is greater than 0.04 MPa, a is taken as 0.77; if the difference is less than 0.01 MPa, a is taken as 0.

64.

9. The evaluation method for waste incineration fly ash and asphalt binder specimens according to claim 8, characterized in that: Conduct a shear strength test on the shear strength test group to determine the shear strength stability value θ, specifically: Fix the specimen in the fixture of the universal testing machine and adjust the fixture position so that the shear surface of the specimen is parallel to and just in contact with the shear head of the equipment. Set the load speed to 15mm / min, start the equipment and perform a shear test on the specimen. The maximum shear strength at the time of specimen failure is used as the test result. For three non-continuous groups of waste incineration fly ash plane-asphalt binder specimens, shear strength tests are required on five asphalt-covered surfaces. The maximum shear strength when the specimen is damaged is recorded as θ. 非连续i After completing 3 parallel tests, calculate the average value of the discontinuous shear strength θ 非连续 , the calculation formula is; For three consecutive groups of waste incineration fly ash plane-asphalt binder specimens, the shear strength test of the top surface of the specimens is required. When the specimens are damaged, the maximum shear strength is recorded as θ 顶面连续i After completing 3 tests, calculate the average value of continuous shear strength θ 连续 , the calculation formula is: The shear strength stability value θ of the waste incineration fly ash plane-asphalt binder specimen is calculated according to the following formula: θ=aθ 连续 +bθ 非连续 Where: θ is the shear strength stability value; θ 连续 is the average value of continuous shear strength; θ 非连续 is the average value of discontinuous shear strength; c is the stable ratio parameter of continuous shear strength, ranging from 0.59 to 0.72; d is the stable ratio parameter of discontinuous shear strength, ranging from 0.28 to 0.41, and parameter c+d=1, when the average value of discontinuous shear strength θ 非连续 and the average value of continuous shear strength θ 连续 If the difference is greater than 0.003 MPa, a is taken as 0.72; if the difference is less than 0.0009 MPa, a is taken as 0.59.

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