Environment-friendly high-strength foamed asphalt concrete and preparation method thereof

Abstract

The application discloses an environment-friendly high-strength foamed asphalt concrete and a preparation method thereof, and belongs to the technical field of asphalt concrete, and aims at solving the technical problems of low strength and poor high and low temperature resistance of foamed asphalt concrete in the prior art. The preparation method of the environment-friendly high-strength foamed asphalt concrete comprises the following steps: S1, heating and melting of base asphalt to obtain melted base asphalt; the melted base asphalt is added with composite polyester to obtain a mixture; S2, low-speed shearing of the mixture, high-speed shearing of the mixture, addition of modified warm-mixing agent into foamed warm-mixing asphalt, and high-speed shearing again to prepare the foamed warm-mixing asphalt; and S3, mixing of the foamed warm-mixing asphalt, coarse aggregate, fine aggregate and mineral powder to prepare the environment-friendly high-strength foamed warm-mixing asphalt concrete. In the preparation of the foamed warm-mixing asphalt, the composite polyester and the modified warm-mixing agent are doped, so that the strength and the high and low temperature resistance of the prepared asphalt concrete can be improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of asphalt concrete, and particularly relates to an environment-friendly high-strength foamed asphalt concrete and a preparation method thereof. BACKGROUND

[0002] In recent years, with the continuous increase of traffic flow, the demand for high-grade pavement is increasing, and the proportion of asphalt concrete pavement is also increasing year by year. Semi-rigid base accounts for the majority in the existing domestic highway, but the production of reflection cracks causes a series of pavement diseases to appear; paving flexible or semi-flexible structure layer is a good way to fundamentally solve the problem. Foamed asphalt mixture has the advantages of delaying pavement damage time and being easier to mix and construct than conventional asphalt concrete; in addition, foamed asphalt warm mix material can reduce construction temperature, reduce harmful gas emission, and thus reduce damage to the health of construction personnel, which meets the requirements of green low-carbon environmental protection in China.

[0003] Patent application CN105060926A discloses a preparation method of foamed warm mix asphalt concrete. High-temperature asphalt is mixed with cold water, and gas is introduced to generate foamed asphalt; new mineral aggregate, old mineral aggregate and foamed asphalt are wet mixed to prepare foamed asphalt warm mix concrete. However, the doping of foaming material can reduce the strength and high-low temperature resistance of the prepared asphalt concrete.

[0004] In view of the technical defects in this regard, a solution is proposed. SUMMARY

[0005] The present application aims to provide a preparation method of environment-friendly high-strength foamed asphalt concrete, which solves the technical problems of low strength and poor high-low temperature resistance of foamed asphalt concrete in the prior art.

[0006] The object of the present application can be achieved by the following technical solutions:

[0007] A preparation method of environment-friendly high-strength foamed asphalt concrete, comprising the following steps:

[0008] S1, melt the base asphalt at 70-80℃ to obtain melted base asphalt; add composite polyester to the melted base asphalt and stir uniformly to obtain a mixture;

[0009] S2, shear the mixture to obtain foamed warm mix asphalt; add a modified warm mix agent to the foamed warm mix asphalt and shear again to prepare foamed warm mix asphalt;

[0010] S3, mix the foamed warm mix asphalt, coarse aggregate, fine aggregate and mineral powder uniformly to prepare environment-friendly high-strength foamed warm mix asphalt concrete.

[0011] Further, the preparation method of the composite polyester comprises the following steps:

[0012] A1, the furfuryl amine, propylene oxide and solvent are uniformly mixed, and are reacted at 40-45 DEG C for 10-15 h under a nitrogen atmosphere to obtain an intermediate product;

[0013] The furfuryl amine and propylene oxide are reacted with ethyl ether as a solvent to obtain an intermediate product, and the reaction formula is as follows:

[0014]

[0015] A2, maleic anhydride is added to the intermediate product, which is uniformly mixed and reacted at 35-45 DEG C for 2-3 h, and then the solvent is removed by rotary evaporation under reduced pressure to obtain a modified polyol;

[0016] A3, the polyol and toluene diisocyanate are reacted at 45-55 DEG C for 6-8 h under a nitrogen atmosphere to synthesize a composite polyester.

[0017] The intermediate product and maleic anhydride can react at room temperature to generate a composite polyester containing a polycyclic structure.

[0018] Further, in step A1, the amount ratio of furfuryl amine, propylene oxide and solvent is 10-20 g:6-12 g:80-100 mL; in step A2, the amount ratio of the intermediate product and maleic anhydride is 80-100 g:2-5 g, and the rotary evaporation temperature under reduced pressure is 35-40 DEG C; in step A3, the amount ratio of the polyol and toluene diisocyanate is 75-80 g:17-34 g.

[0019] Further, the preparation method of the modified warm-mixing agent comprises the following steps:

[0020] B1, the surfactant NS-T and the surfactant C-35 are uniformly mixed to obtain a bio-based warm-mixing agent mixture;

[0021] B2, sodium alginate is added to the bio-based warm-mixing mixture, and is stirred and dissolved to obtain A liquid; chitosan and anhydrous calcium chloride are added to deionized water, and acetic acid is added, and is stirred and dissolved to obtain B liquid; the A liquid is added dropwise to the B liquid, and after the dropwise addition is completed, standing and washing with distilled water are performed to prepare a composite small ball;

[0022] The sodium alginate embedding the bio-based warm-mixing mixture is a core, the anhydrous calcium chloride is a crosslinking agent, and the chitosan is a shell, so that the composite small ball is prepared.

[0023] B3, the SBS resin is heated and melted to obtain a molten SBS resin; the molten SBS resin and nano-sized zinc oxide are uniformly mixed to obtain a modified adhesive; and the modified adhesive is sprayed on the surface of the composite small ball, and is naturally cooled to room temperature to prepare a modified warm-mixing agent.

[0024] Using composite microspheres as the core, a modified adhesive is adhered to the surface of the composite microspheres through a spraying process to prepare a modified warm-mix agent with a double-layer core-shell structure.

[0025] Further, in step B1, surfactant A is surfactant NS-T, and surfactant B is surfactant C-35; the mass ratio of surfactant NS-T to surfactant C-35 is 1-2:1.

[0026] Further, in step B2, the ratio of sodium alginate to bio-based warm-stirred mixture is 3-10g:100-120mL, and the ratio of chitosan, anhydrous calcium chloride, deionized water, and acetic acid is...

[0027] 3-5g:3-5g:100mL:0.5-1mL, the mass ratio of solution A to solution B is 5-10:1; the standing temperature is 40-45℃ and the standing time is 20-24h.

[0028] Furthermore, in step B3, the SBS resin is heated to melt at a temperature of 200-210℃, and the mass ratio of molten SBS resin to nano-sized zinc oxide is 2:1; the coating thickness of the modified adhesive is 1-2 mm.

[0029] Further, in step S1, the ratio of the molten base asphalt, warm mix agent, and modified polyurethane is 300g:10-15g:20-30g; in step S2, the mixture shearing includes first low-speed shearing and then high-speed shearing; the rotation speed of low-speed shearing is 1000-1500r / min, and the duration of low-speed shearing is 3-5min; the rotation speed of high-speed shearing is 4000-5000r / min, and the duration of high-speed shearing is 10-15min; the duration of the second shearing is 3000-4000r / min, and the duration of the second high-speed shearing is 10-15min.

[0030] As another aspect of the present invention, an environmentally friendly high-strength foamed asphalt concrete preparation method is provided to obtain environmentally friendly high-strength foamed asphalt concrete.

[0031] The present invention has the following beneficial effects:

[0032] 1. The foam warm-mix asphalt, coarse aggregate, fine aggregate and mineral powder are uniformly mixed to prepare the foam asphalt concrete. The foam warm-mix asphalt adopts the composite polyester modified base asphalt, and then the modified warm-mixing agent is doped to optimize the comprehensive performance of the foam warm-mix asphalt, and then the environment-friendly high-strength foam asphalt concrete is prepared. The functional groups in the composite polyester can react with the base asphalt components to improve the compatibility with the asphalt; the present application uses the reactant of furfurylamine, propylene oxide and maleic anhydride as a modified polyol to improve the strength and high and low temperature resistance of the base asphalt doped with the composite polyester. The above-mentioned composite polyester can replace the compatibilizer, promote the combination of polyurethane and asphalt, and form a stable blend.

[0033] 2. The modified warm-mixing agent with a double-layer core-shell structure designed in the present application can reduce the viscosity of the asphalt at normal construction temperature and has better foaming performance. The surfactant NS-T and surfactant C-35 are prepared and mixed as a bio-based warm-mixing liquid, which has the advantages of renewable, degradable and environmental protection. After the above-mentioned bio-based warm-mixing liquid is prepared into a composite small ball with a core-shell structure, SBS resin and nano-sized zinc oxide are adhered; the SBS resin can be used as an adhesive to improve the wrapping of the composite small ball; the nano-sized zinc oxide itself can wrap the asphalt components through the oxide film generated on its surface, hinder the oxidation reaction of the asphalt with oxygen, and delay the comprehensive performance of the prepared asphalt. The modified warm-mixing agent designed in the present application has multiple functions of reducing the construction temperature, improving the mechanical properties, resisting high and low temperature, etc. DETAILED DESCRIPTION

[0034] The technical solutions of the present application will be described below in conjunction with the embodiments, obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0035] The sodium alginate used in the embodiments 4-6 of the present application is purchased from Shanghai Yuan Ye Biological Technology Co., Ltd., and the article number is S11053; the chitosan used in the embodiments 4-6 of the present application is purchased from Xi'an Kangnuo Chemical Co., Ltd.; the SBS resin used in the embodiments 4-6 of the present application is purchased from Suzhou Kaixi Plastic Co., Ltd., the article number is SBS001, and the brand is D1101; the nano-sized zinc oxide used in the embodiments 4-6 of the present application is purchased from Daxi Concentrated Nanometer Technology Co., Ltd., the model is DXN-HQ20, the particle size is 30nm, the specific surface area is 45m 2The matrix asphalt used in the embodiments 7-9 of the present application is 70# matrix asphalt purchased from Hebei Fentaiyuan Energy Technology Co., Ltd., with a softening point of 52℃ and a dynamic viscosity of 230 Pa·s (60℃); the quartz sand used in the embodiments 7-9 of the present application is purchased from Beijing Yan Guilai Environmental Protection Technology Co., Ltd., with a product number of 344 and a bulk density of 1.54 kg / cm 3 ; the mineral powder used in the embodiments 7-9 of the present application is purchased from Lingshou County Mingyi New Material Co., Ltd., with a product number of 2; and the limestone crushed stone used in the embodiments 7-9 of the present application has a particle size of 10 mm and an apparent density of 2.65 g / cm 3 .

[0036] Embodiment 1

[0037] The present embodiment provides a preparation method of a composite polyester for environmentally friendly high-strength foamed asphalt concrete, comprising the following steps:

[0038] A1, 10g of furfurylamine, 6g of propylene oxide and 80mL of solvent ether are added into a three-necked flask and mixed; the three-necked flask is placed in a nitrogen atmosphere and reacted at 40℃ for 10h; after the reaction is completed, an intermediate product is obtained.

[0039] A2, 2g of maleic anhydride is added into 80g of the intermediate product and mixed; the mixture is reacted at 35℃ for 2h; then the ether solvent is removed by rotary evaporation under reduced pressure at 35℃, to obtain a modified polyol.

[0040] A3, 75g of the modified polyol is added into a three-mouthed round-bottom flask; then 17g of toluene diisocyanate is added into the three-mouthed round-bottom flask; the mixture is placed in a nitrogen atmosphere and reacted at 45℃ for 6h, to synthesize a composite polyester.

[0041] Embodiment 2

[0042] The present embodiment provides a preparation method of a composite polyester for environmentally friendly high-strength foamed asphalt concrete, comprising the following steps:

[0043] A1, 15g of furfurylamine, 10g of propylene oxide and 90mL of ether are added into a three-necked flask and mixed; the three-necked flask is placed in a nitrogen atmosphere and reacted at 42℃ for 12h; after the reaction is completed, an intermediate product is obtained.

[0044] A2, 3g of maleic anhydride is added into 90g of the intermediate product and mixed; the mixture is reacted at 40℃ for 2.5h; then the ether solvent is removed by rotary evaporation under reduced pressure at 38℃, to obtain a modified polyol.

[0045] A3, 78g of the modified polyol is added into a three-mouthed round-bottom flask; then 25g of toluene diisocyanate is added into the three-mouthed round-bottom flask; the mixture is placed in a nitrogen atmosphere and reacted at 50℃ for 7h, to synthesize a composite polyester.

[0046] Example 3

[0047] The embodiment provides a preparation method of a composite polyester for environment-friendly high-strength foamed asphalt concrete, and the method comprises the following steps:

[0048] A1, 20g of furfurylamine, 12g of propylene oxide and 100mL of diethyl ether are added into a three-necked flask and uniformly mixed; the three-necked flask is placed in a nitrogen atmosphere and reacted at 45°C for 15h; after the reaction is completed, an intermediate product is obtained.

[0049] A2, 5g of maleic anhydride is added into 100g of the intermediate product and uniformly mixed, and reacted at 45°C for 3h; then, diethyl ether solvent is removed by rotary evaporation under reduced pressure at 40°C, and a modified polyol is obtained.

[0050] A3, 80g of the modified polyol is added into a three-necked flask, and then 34g of toluene diisocyanate is added into the three-necked flask, which is placed in a nitrogen atmosphere and reacted at 55°C for 8h, so as to synthesize a composite polyester.

[0051] Example 4

[0052] The embodiment provides a preparation method of a modified warm-mixing agent for environment-friendly high-strength foamed asphalt concrete, and the method comprises the following steps:

[0053] B1, a surfactant NS-T and a surfactant C-35 are uniformly mixed according to a mass ratio of 1:1, so as to obtain a bio-based warm-mixing agent mixture.

[0054] B2, 3g of sodium alginate is weighed and added into 100mL of the bio-based warm-mixing agent mixture and stirred and dissolved, so as to obtain a liquid A; 3g of chitosan and 3g of anhydrous calcium chloride are weighed and added into 100mL of deionized water, and 0.5g of acetic acid is added and stirred and dissolved, so as to obtain a liquid B; the liquid A is added dropwise into the liquid B at a rate of 1mL / min, and the mass ratio of the liquid A to the liquid B is 5:1; after the dropwise addition is completed, the mixture is placed at 40°C for 20h, and then washed with distilled water for 4 times, so as to prepare a composite small ball with a core-shell structure.

[0055] B3, the SBS resin is heated to 200°C to be melted, so as to obtain a molten SBS resin; the molten SBS resin and nano-sized zinc oxide are mixed according to a mass ratio of 2:1 by using a high-speed shearing dispersion machine at 5000r / min for 10min, so as to obtain a modified adhesive; the modified adhesive is sprayed on the surface of the composite small ball by using a high-pressure airless spraying device, the pressure of the high-pressure airless spraying device is 0.4MPa, the nozzle of the high-pressure airless spraying device is 25cm away from the surface of the composite small ball, the spraying environment temperature is 25°C, the spraying humidity is 35%RH, the spraying thickness is 1mm, and then the modified adhesive is naturally cooled to room temperature, so as to obtain a modified warm-mixing agent.

[0056] Example 5

[0057] The embodiment provides a preparation method of an environment-friendly modified warm-mixing agent for high-strength foamed asphalt concrete, and comprises the following steps:

[0058] B1, uniformly mixing surfactant NS-T and surfactant C-35 according to a mass ratio of 2:1 to obtain a bio-based warm-mixing agent mixture.

[0059] B2, adding 7g of sodium alginate into 110mL of the bio-based warm-mixing agent mixture, stirring and dissolving to obtain A liquid. Adding 4g of chitosan and 4g of anhydrous calcium chloride into 100mL of deionized water, and adding 0.8mL of acetic acid, stirring and dissolving to obtain B liquid. Dropping A liquid into B liquid at a rate of 1mL / min, the mass ratio of A liquid to B liquid is 8:1, after dropping is completed, standing at 42℃ for 22h, and then washing 5 times with distilled water to prepare a composite small ball with a core-shell structure.

[0060] B3, heating SBS resin to 205℃ to make it melt to obtain a molten SBS resin; mixing the molten SBS resin and nano-sized zinc oxide according to a mass ratio of 3:1, and mixing for 15min by using a high-speed shearing dispersion machine at 4500r / min to obtain a modified adhesive. Spraying the modified adhesive on the surface of the composite small ball by using a high-pressure airless spraying device, the pressure of the high-pressure airless spraying device is 0.5MPa, the nozzle is 26cm away from the surface of the composite small ball, the spraying environment temperature is 25℃, the spraying humidity is 45%RH, the spraying thickness is 2mm, and then naturally cooling to room temperature to prepare a modified warm-mixing agent.

[0061] Embodiment 6

[0062] The embodiment provides a preparation method of an environment-friendly modified warm-mixing agent for high-strength foamed asphalt concrete, and comprises the following steps:

[0063] B1, uniformly mixing surfactant NS-T and surfactant C-35 according to a mass ratio of 2:1 to obtain a bio-based warm-mixing agent mixture.

[0064] B2, adding 7g of sodium alginate into 110mL of the bio-based warm-mixing agent mixture, stirring and dissolving to obtain A liquid. Adding 4g of chitosan and 4g of anhydrous calcium chloride into 100mL of deionized water, and adding 0.8mL of acetic acid, stirring and dissolving to obtain B liquid. Dropping A liquid into B liquid at a rate of 1mL / min, the mass ratio of A liquid to B liquid is 8:1, after dropping is completed, standing at 42℃ for 22h, and then washing 5 times with distilled water to prepare a composite small ball with a core-shell structure.

[0065] B3, the SBS resin is heated to 210℃ to melt, obtaining the molten SBS resin; the molten SBS resin and the nano-sized zinc oxide are mixed according to a mass ratio of 3:1, and a high-speed shearing dispersion machine is used to mix for 5 min at 5500 r / min, obtaining the modified adhesive. The modified adhesive is sprayed on the surface of the composite pellet by using a high-pressure airless spraying device, the pressure of the high-pressure airless spraying device is 0.6 MPa, the nozzle is 258 cm away from the surface of the composite pellet, the spraying environment temperature is 25℃, the spraying humidity is 40% RH, the spraying thickness is 2 mm, and the modified warm-mixing agent is prepared after natural cooling to room temperature.

[0066] Example 7

[0067] The embodiment provides a preparation method of environment-friendly high-strength foam asphalt concrete, and the method comprises the following steps:

[0068] S1, 300g of base asphalt is weighed, the base asphalt is transferred to an oven, the oven temperature is set to 70℃, and the base asphalt is heated and melted at the temperature to obtain molten base asphalt. Then, 15g of the composite polyester prepared in Example 1 is added to the molten base asphalt, and the mixture is stirred uniformly to obtain a mixture.

[0069] S2, the mixture is placed in a shearing machine homogenizer, the rotating speed of the cutter head of the shearing machine homogenizer is set to 1000 r / min, and the mixture is sheared at low speed for 3 min; then the rotating speed of the cutter head of the shearing machine homogenizer is set to 4000 r / min, and the mixture is sheared at high speed for 10 min, to prepare foam warm-mixing asphalt; then the modified warm-mixing agent prepared in Example 4 is added to the foam warm-mixing asphalt, and the mixture is sheared at high speed again at 3000 r / min for 10 min, to prepare foam warm-mixing asphalt.

[0070] S3, 10 parts of the foam warm-mixing asphalt, 45 parts of coarse aggregate limestone crushed stone, 3 parts of mineral powder and 40 parts of fine aggregate quartz sand are uniformly mixed according to weight parts, to prepare environment-friendly high-strength foam asphalt concrete.

[0071] Example 8

[0072] The embodiment provides a preparation method of environment-friendly high-strength foam asphalt concrete, and the method comprises the following steps:

[0073] S1, 300g of base asphalt is weighed, the base asphalt is transferred to an oven, the oven temperature is set to 75℃, and the base asphalt is heated and melted at the temperature to obtain molten base asphalt. Then, 20g of the composite polyester prepared in Example 2 is added to the molten base asphalt, and the mixture is stirred uniformly to obtain a mixture.

[0074] S2, a shearing machine homogenizer is placed in the mixture, the rotating speed of the cutter head of the shearing machine homogenizer is set to 1200 r / min, low-speed shearing is performed for 5 min; then the rotating speed of the cutter head of the shearing machine homogenizer is set to 4500 r / min, high-speed shearing is performed for 12 min, to prepare the foamed warm mix asphalt; then the modified warm mix agent prepared in Example 5 is added into the foamed warm mix asphalt, high-speed shearing is performed again at 3500 r / min for 12 min, to prepare the foamed warm mix asphalt.

[0075] S3, 15 parts of the foamed warm mix asphalt, 48 parts of the coarse aggregate limestone crushed stone, 5 parts of the mineral powder and 42 parts of the fine aggregate quartz sand are uniformly mixed according to the weight parts, to prepare the environment-friendly high-strength foamed asphalt concrete.

[0076] Example 9

[0077] The embodiment provides a preparation method of environment-friendly high-strength foamed asphalt concrete, comprising the following steps:

[0078] S1, 300 g of base asphalt is weighed, the base asphalt is transferred to an oven, the temperature of the oven is set to 80℃, and heating and melting are performed at the temperature, to obtain melted base asphalt. Then 25 g of the composite polyester prepared in Example 3 is added into the melted base asphalt, and stirring is uniformly performed, to obtain a mixture.

[0079] S2, a shearing machine homogenizer is placed in the mixture, the rotating speed of the cutter head of the shearing machine homogenizer is set to 1500 r / min, low-speed shearing is performed for 5 min; then the rotating speed of the cutter head of the shearing machine homogenizer is set to 5000 r / min, high-speed shearing is performed for 15 min, to prepare the foamed warm mix asphalt; then the modified warm mix agent prepared in Example 6 is added into the foamed warm mix asphalt, high-speed shearing is performed again at 4000 r / min for 15 min, to prepare the foamed warm mix asphalt.

[0080] S3, 20 parts of the foamed warm mix asphalt, 50 parts of the coarse aggregate limestone crushed stone, 5 parts of the mineral powder and 45 parts of the fine aggregate quartz sand are uniformly mixed according to the weight parts, to prepare the environment-friendly high-strength foamed asphalt concrete.

[0081] Comparative Example 1

[0082] The difference between the comparative example and Example 9 lies in that the same mass of ethylene glycol is used to replace the modified polyol when the composite polyester is prepared.

[0083] Comparative Example 2

[0084] The difference between the comparative example and Example 9 lies in that the step B3 is cancelled when the modified warm mix agent is prepared, and the specific preparation steps are as follows:

[0085] The modified adhesive and the composite small ball are mixed according to the mass ratio of 1:5, to prepare the modified warm mix agent.

[0086] Comparative Example 3

[0087] The present comparative example is different from Example 9 in that, when preparing the modified warm-mixing agent, A liquid and B liquid are blended according to a mass ratio of 5:1, and the blend replaces the composite small spheres with a core-shell structure.

[0088] Performance test:

[0089] 1. Take the environmentally friendly high-strength foamed warm-mixed asphalt concrete prepared in Examples 7-9, and mark its initial mass as m; then place it in water, and take the mass of the test piece in water as m1. The test piece density formula is calculated as follows:

[0090] p = (m / m-m1) p w

[0091] p: test piece density, g / cm 3 ; m: test piece mass in air, g; m1: test piece mass in water, g; p w : density of water at 20°C.

[0092] 2. Prepare the environmentally friendly high-strength foamed asphalt concrete prepared in Examples 7-9 and Comparative Examples 1-3 into cylindrical test pieces, with a diameter of 100 mm and a height of 65 mm; use a universal material testing machine to perform indirect tensile tests on the environmentally friendly high-strength foamed asphalt concrete test pieces prepared in Examples 7-9 and Comparative Examples 1-3, with a loading speed of 50 mm / min.

[0093] 3. Prepare the environmentally friendly high-strength foamed asphalt concrete prepared in Examples 7-9 and Comparative Examples 1-3 into small beam test pieces with dimensions of 250 mm x 30 mm x 35 mm; first perform curing treatment at room temperature, and then cool in a low-temperature environment of -10°C to ensure uniform temperature inside and outside the test piece. Finally, place the test piece in a low-temperature constant-temperature box for 30 min, and then take it out and place it on a low-temperature beam bending testing machine. The testing machine records and displays the bending tensile stress and strain curve of the test piece in real time during the loading process, until the test piece cracks or reaches the maximum load, and then analyzes the bending tensile strain value of the test piece. The specific test results are shown in Table 1:

[0094] Table 1. Test sample performance test data

[0095]

[0096] Data analysis: The environmentally friendly high-strength foam asphalt concrete prepared in examples 7-9 in the application all have high density and mechanical properties (showing a large tensile strength value); in the preparation of foam warm mix asphalt, by doping composite polyester and modified warm mix agent, the density of the prepared asphalt concrete can be improved. However, in comparative example 2 and comparative example 3, when preparing the modified warm mix agent, the double composite core-shell structure cannot be formed, thereby reducing the density of the prepared foam asphalt concrete. In comparative example 1, the same mass of ethylene glycol is used to replace the modified polyol, thereby reducing the mechanical properties of the prepared asphalt concrete, showing a decrease in tensile strength value.

[0097] The environmentally friendly high-strength foam asphalt concrete prepared in examples 7-9 in the application all have good low-temperature resistance, showing that the environmentally friendly high-strength foam asphalt concrete prepared in examples 7-9 still has a high bending tensile strain value after cooling at a low temperature of-10℃. The bending tensile strain value of the asphalt concrete prepared in comparative examples 2-3 is reduced.

[0098] The above is only an example and description of the structure of the application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the structure of the application or exceed the scope defined by the claims.

[0099] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples as appropriate.

[0100] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details and do not limit the application to the specific embodiments. Obviously, many modifications and changes can be made according to the content of the present specification. The present specification selects and describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their entire scope and equivalents.

Claims

1. A method for preparing an environmentally friendly high-strength foamed asphalt concrete, characterized by, It comprises the following steps: S1, the base pitch is heated and melted at 70-80 DEG C, and the melted base pitch is obtained; the composite polyester is added into the melted base pitch, and stirred uniformly to obtain a mixture; the preparation method of the composite polyester, It comprises the following steps: A1, the furfurylamine, propylene oxide and solvent are mixed uniformly, and are reacted at 40-45 DEG C for 10-15h under inert atmosphere to obtain an intermediate product; A2, maleic anhydride is added into the intermediate product, mixed uniformly, and reacted at 35-45 DEG C for 2-3h, and then the solvent is removed by rotary evaporation under reduced pressure to obtain a modified polyol; A3, the modified polyol and toluene diisocyanate are reacted at 45-55 DEG C for 6-8h under inert atmosphere to synthesize the composite polyester; S2, the mixture is sheared to obtain foamed warm mix asphalt; the foamed warm mix asphalt is added with a modified warm mix agent, and is sheared again to obtain foamed warm mix asphalt; The preparation method of the modified warm mix agent comprises the following steps: B1, the surfactant A and the surfactant B are mixed uniformly to obtain a bio-based warm mix agent mixture; the surfactant A is surfactant NS-T, and the surfactant B is surfactant C-35; B2, sodium alginate is added into the bio-based warm mix mixture, and is stirred and dissolved to obtain A liquid; chitosan and anhydrous calcium chloride are added into deionized water, and acetic acid is added, and is stirred and dissolved to obtain B liquid; the A liquid is added dropwise into the B liquid, and after the addition is completed, standing, and washing with distilled water to obtain a composite small ball; B3, the SBS resin is heated and melted to obtain a molten SBS resin; the molten SBS resin and nano-sized zinc oxide are mixed uniformly to obtain a modified adhesive; the modified adhesive is sprayed on the surface of the composite small ball, and is naturally cooled to room temperature to obtain a modified warm mix agent; S3, the foamed warm mix asphalt, coarse aggregate, fine aggregate and mineral powder are mixed uniformly to obtain environment-friendly high-strength foamed warm mix asphalt concrete.

2. The preparation method of the environment-friendly high-foam asphalt concrete according to claim 1, characterized in that, In step A1, the amount ratio of furfurylamine, propylene oxide and solvent is 10-20g:6-12g:80-100mL; in step A2, the amount ratio of the intermediate product and maleic anhydride is 80-100g:2-5g, and the temperature of rotary evaporation under reduced pressure is 35-40 DEG C; in step A3, the amount ratio of the modified polyol and toluene diisocyanate is 75-80g:17-34g.

3. The preparation method of the environment-friendly high-foam asphalt concrete according to claim 1, characterized in that, In step B1, the mass ratio of surfactant NS-T and surfactant C-35 is 1-2:

1.

4. The preparation method of the environment-friendly high-foam asphalt concrete according to claim 1, characterized in that, In step B2, the amount ratio of sodium alginate and bio-based warm mix mixture is 3-10g:100-120mL, and the amount ratio of chitosan, anhydrous calcium chloride, deionized water and acetic acid is 3-5g:3-5g:100mL:0.5-1mL, and the mass ratio of A liquid and B liquid is 5-10:1; the standing temperature is 40-45 DEG C, and the standing time is 20-24h.

5. The preparation method of the environment-friendly high-foam asphalt concrete according to claim 1, characterized in that, In step B3, the temperature of heating and melting of the SBS resin is 200-210 DEG C, and the mass ratio of the molten SBS resin and nano-sized zinc oxide is 2-3:1; the spraying thickness of the modified adhesive is 1-2mm.

6. The preparation method of the environment-friendly high-foam asphalt concrete according to claim 1, characterized in that, In steps S1 and S2, the amount ratio of the melted base pitch, the warm-mixing agent and the composite polyester is 300g:10-15g:20-30g; in step S2, the shearing of the mixture includes low-speed shearing first and then high-speed shearing; the rotation speed of the low-speed shearing is 1000-1500r / min, the time length of the low-speed shearing is 3-5min; the rotation speed of the high-speed shearing is 4000-5000r / min, the time length of the high-speed shearing is 10-15min; the rotation speed of the re-shearing is 3000-4000r / min, the time length of the re-high-speed shearing is 10-15min.

7. An environmentally friendly high-strength foamed asphalt concrete, characterized by, The preparation method of the environment-friendly high-strength foamed asphalt concrete is prepared by using the method according to any one of claims 1-6.

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