Construction method of ultra-thin overlay asphalt mixture

Abstract

The invention discloses a construction method of an ultrathin overlay asphalt mixture. According to the invention, the high-viscosity asphalt is used as a raw material, SBS and sulfur are used as main materials, the solubilizer and the odor-removing additive are used as auxiliary materials to modify the asphalt, then the asphalt is mixed with the aggregate to prepare the ultrathin overlay asphalt mixture, and the adhesive is used as an auxiliary material to improve the construction effect.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, and more specifically to a construction method of an ultra-thin overlay layer asphalt mixture. Background Art

[0002] At the end of the last century, many projects were carried out in many regions of China, focusing on the addition of thin asphalt overlays based on the original cement concrete pavement, but they did not achieve the expected results. The addition of thin asphalt overlays on old cement concrete pavements involves two types of pavement structures: rigid and flexible.

[0003] In the follow-up of the test section after overlay, it was found that the thin layer of asphalt overlay is prone to reflective cracks after one to two years of use. Generally, the reflective cracks of the asphalt overlay will expand on a large scale after four to five years, which will seriously damage the structural integrity and continuity of the road surface and reduce the strength of the road surface structure.

[0004] As cracks appear on the asphalt overlay, water from the road surface and rainwater seep into the roadbed, causing damage to the base layer. Under the repeated action of vehicle loads, pumping is likely to occur, accelerating the peeling of the asphalt pavement around the cracks and the destruction of the asphalt pavement, forming a vicious cycle that seriously affects the performance of the road. As water seeps into the road surface and under the repeated action of vehicle loads, the asphalt thin layer slowly peels off from the old cement concrete pavement, causing the pavement surface to fall off, seriously affecting driving safety and driving comfort.

[0005] The purpose of the present invention is to provide a construction method for an ultra-thin overlay layer asphalt mixture with good stability, high strength, durability and excellent noise reduction function, so as to solve the technical problems of existing asphalt overlays. Summary of the invention

[0006] 1. To solve the above technical problems, the technical solution provided by the present invention includes the following contents:

[0007] A construction method of an ultra-thin overlay asphalt mixture is as follows:

[0008] (1) Clean the cement concrete pavement to be constructed to remove debris and moisture;

[0009] (2) Apply 0.4~0.6 kg*m-2 of adhesive on the pavement surface;

[0010] (3) When applying the binder, simultaneously spread the ultra-thin overlay asphalt mixture at 175℃~185℃ on the surface of the binder layer with a thickness of 0.8cm~1.8cm;

[0011] (4) After the pavement is paved, use a steel wheel roller to roll it 6 to 8 times;

[0012] (5) After rolling, the material is naturally cooled and formed for 1 hour to complete the construction.

[0013] 2. Furthermore, the preparation method of the ultra-thin overlay asphalt mixture is as follows:

[0014] (1) Heat 200 parts of high-viscosity asphalt at 160-170°C until it becomes fluid, add 4-8 parts of SBS and 12-20 parts of high-viscosity rubber particles while stirring, and emulsify for 15 minutes;

[0015] (2) The emulsified asphalt is heated to 175-185°C, and 2-4 parts of the solubilizer are added while stirring. After the addition is completed, stirring is continued for 30 minutes to obtain a mixture A;

[0016] (3) Mixture A was transferred to a shearing device and sheared at 175-185°C for 15 min. 0.5-0.8 parts of sulfur and 0.06-0.1 parts of a deodorizing additive were added and sheared at 175-185°C for 1 h. The mixture was then dried in an oven at 18°C ​​for 40 min to obtain a modified high-viscosity asphalt.

[0017] (4) 130-160 parts of coarse aggregate with a particle size of 2.36-13.2 mm, 35-43 parts of fine aggregate with a particle size of 0.075-2.36 mm, and 10-15 parts of filler with a particle size less than 0.075 mm are stirred and mixed at 135°C-165°C to obtain aggregate;

[0018] (5) Take the modified asphalt and aggregate in a mass ratio of 16-18:190-210, stir and mix at 140°C-160°C, and cure at 170°C-190°C to obtain an ultra-thin overlay asphalt mixture.

[0019] 3. Furthermore, the solubilizing agent is shallow oil extraction MES.

[0020] 4. Furthermore, the deodorizing additive is MOF-801(Zr).

[0021] 5. Furthermore, the binder is a composite epoxy resin, which contains 0.2% to 0.4% bicyclic amidine, 8% to 10% vinyl pentamethyl disiloxane, and the rest is epoxy resin.

[0022] The beneficial effects of the present invention are:

[0023] (1) The present invention utilizes a solubilizer to assist an emulsifier in modifying and optimizing high-viscosity asphalt, and utilizes a deodorizing additive to optimize the environmental friendliness of the mixture and reduce odorous gas emissions. During construction, the adhesive is spread simultaneously with the asphalt mixture to prevent secondary pollution, thereby ensuring the interlayer adhesion between the thin layer system and the original road surface and avoiding the possibility of the adhesive being contaminated after spraying during the construction process, thereby affecting the time required for paving.

[0024] (2) In order to ensure that the ultra-thin overlay layer and the cement pavement have a good bonding effect, a layer of adhesive needs to be applied before paving so that the ultra-thin overlay layer and the cement pavement form a continuous bonding structure to ensure its bonding effect. The present invention selects a composite epoxy resin as an adhesive, which can be well embedded between the cement pavement and the asphalt mixture to form a continuous embedded structure, destroying the boundary between the ultra-thin overlay layer and the cement pavement to provide excellent interlayer bonding strength. In the composite epoxy resin, dicyclic amidine and vinyl pentamethyl disiloxane are used as modifiers. Dicyclic amidine is a common epoxy resin curing agent that can adjust the curing rate of epoxy resin to make it suitable for the construction of ultra-thin overlay layers. Vinyl pentamethyl disiloxane can form a graft with the epoxy resin during the curing process with the help of dicyclic amidine, and introduce a flexible chain during the curing process of the epoxy resin, thereby optimizing the toughness of the epoxy resin, improving the compressive strength of the construction pavement and optimizing the noise reduction ability.

[0025] (3) The present invention uses a combination of high-viscosity rubber and SBS to modify high-viscosity asphalt, but the solubility of both in asphalt is poor and they are easy to form particles in asphalt, which affects the performance of the mixture. Therefore, additional solubilization is required. The present invention selects shallow oil extraction MES as a solubilizer. It has excellent solubility and compatibility with asphalt. It can be used as an intermediate to assist the compatibility of high-viscosity rubber, SBS, and high-viscosity asphalt in the system. Shallow oil extraction MES has a complex structure of complex saturated rings, unsaturated rings, and branches. It can be combined with a unique structure of soft and hard segments, thereby reducing the interaction between molecular chains, improving the compatibility of the unique structure of SBS with the system, and improving the durability of the asphalt mixture with optimized characteristics.

[0026] (4) Traditional asphalt mixture construction inevitably produces a strong odor. The present invention uses MOF-801 (Zr), an organic framework material with good physical properties, as a deodorizing additive to improve the odor problem. MOF-801 (Zr) as a porous crystal material has a small pore size and strong adsorption capacity. It can effectively adsorb odorous gases, inhibit gas volatilization and reduce the rate of overflow, thereby reducing the odor generated during the construction process. In addition, MOF-801 (Zr) has a stable hollow sphere structure and abundant active sites. The solid material formed after the voids are fully filled with asphalt has greatly improved mechanical properties compared to single asphalt. The multi-interface material structure can effectively reduce the propagation efficiency of sound waves, thereby improving the stability, durability and noise reduction ability of the mixture. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the embodiments.

[0028] In the examples of the present invention, shallow oil extraction MES was purchased from Sinopec Lubricant Company, MOF-801 (Zr) was purchased from Shanghai Kaishu Chemical Technology Co., Ltd., and other raw materials were obtained through conventional commercial channels unless otherwise specified.

[0029] Example 1

[0030] 1. Heat 200 parts of high-viscosity asphalt at 160-170°C until it is fluid, add 6 parts of SBS and 16 parts of high-viscosity rubber particles while stirring and emulsifying for 15 minutes;

[0031] 2. The emulsified asphalt is heated to 175-185°C, and 3 parts of shallow oil MES are added while stirring. After the addition is completed, stirring is continued for 30 minutes to obtain mixture A;

[0032] 3. Mixture A was transferred to a shearing device, sheared at 175-185°C for 15 min, 0.65 parts of sulfur and 0.08 parts of MOF-801 (Zr) were added, sheared at 175-185°C for 1 h, and dried in an oven at 18°C ​​for 40 min to obtain modified high-viscosity asphalt;

[0033] 4. Take 145 parts of coarse aggregate with a particle size of 2.36-13.2 mm, 39 parts of fine aggregate with a particle size of 0.075-2.36 mm, and 12.5 parts of filler with a particle size less than 0.075 mm, stir and mix at 135°C to 165°C to obtain aggregate;

[0034] 5. Take the modified asphalt and aggregate in a mass ratio of 17:200, stir and mix at 140℃~160℃, and cure at 170℃~190℃ to obtain the ultra-thin overlay asphalt mixture.

[0035] Example 2

[0036] 1. Heat 200 parts of high-viscosity asphalt at 160-170°C until it is fluid, add 6 parts of SBS and 16 parts of high-viscosity rubber particles while stirring and emulsifying for 15 minutes;

[0037] 2. The emulsified asphalt is heated to 175-185°C, and 2 parts of shallow oil MES are added while stirring. After the addition is complete, stirring is continued for 30 minutes to obtain mixture A;

[0038] 3. Mixture A was transferred to a shearing device, sheared at 175-185°C for 15 min, 0.65 parts of sulfur and 0.1 parts of MOF-801 (Zr) were added, sheared at 175-185°C for 1 h, and dried in an oven at 18°C ​​for 40 min to obtain modified high-viscosity asphalt;

[0039] 4. Take 145 parts of coarse aggregate with a particle size of 2.36-13.2 mm, 39 parts of fine aggregate with a particle size of 0.075-2.36 mm, and 12.5 parts of filler with a particle size less than 0.075 mm, stir and mix at 135°C to 165°C to obtain aggregate;

[0040] 5. Take the modified asphalt and aggregate in a mass ratio of 17:200, stir and mix at 140℃~160℃, and cure at 170℃~190℃ to obtain the ultra-thin overlay asphalt mixture.

[0041] Example 3

[0042] 1. Heat 200 parts of high-viscosity asphalt at 160-170°C until it is fluid, add 6 parts of SBS and 16 parts of high-viscosity rubber particles while stirring and emulsifying for 15 minutes;

[0043] 2. The emulsified asphalt is heated to 175-185°C, and 4 parts of shallow oil MES are added while stirring. After the addition is completed, stirring is continued for 30 minutes to obtain mixture A;

[0044] 3. Mixture A was transferred to a shearing device and sheared at 175-185°C for 15 min. 0.65 parts of sulfur and 0.06 parts of MOF-801 (Zr) were added and sheared at 175-185°C for 1 h. The mixture was then dried at 18°C ​​for 40 min to obtain a modified high-viscosity asphalt.

[0045] 4. Take 145 parts of coarse aggregate with a particle size of 2.36-13.2 mm, 39 parts of fine aggregate with a particle size of 0.075-2.36 mm, and 12.5 parts of filler with a particle size less than 0.075 mm, stir and mix at 135°C to 165°C to obtain aggregate;

[0046] 5. Take the modified asphalt and aggregate in a mass ratio of 17:200, stir and mix at 140℃~160℃, and cure at 170℃~190℃ to obtain the ultra-thin overlay asphalt mixture.

[0047] Comparative Example 1

[0048] The difference between this comparative example and Example 1 is that the shallow oil MES in step 2 is aromatic oil, and the rest of the implementation method is the same as Example 1.

[0049] Comparative Example 2

[0050] 1. Heat 200 parts of high-viscosity asphalt at 160-170°C until it is fluid, add 6 parts of SBS and 16 parts of high-viscosity rubber particles while stirring and emulsifying for 15 minutes;

[0051] 2. The emulsified asphalt is heated to 175-185°C, and 1.5 parts of shallow oil MES are added while stirring. After the addition is completed, stirring is continued for 30 minutes to obtain mixture A;

[0052] 3. Mixture A was transferred to a shearing device, sheared at 175-185°C for 15 min, 0.65 parts of sulfur and 0.08 parts of MOF-801 (Zr) were added, sheared at 175-185°C for 1 h, and dried in an oven at 18°C ​​for 40 min to obtain modified high-viscosity asphalt;

[0053] 4. Take 145 parts of coarse aggregate with a particle size of 2.36-13.2 mm, 39 parts of fine aggregate with a particle size of 0.075-2.36 mm, and 12.5 parts of filler with a particle size less than 0.075 mm, stir and mix at 135°C to 165°C to obtain aggregate;

[0054] 5. Take the modified asphalt and aggregate in a mass ratio of 17:200, stir and mix at 140℃~160℃, and cure at 170℃~190℃ to obtain the ultra-thin overlay asphalt mixture.

[0055] Comparative Example 3

[0056] 1. Heat 200 parts of high-viscosity asphalt at 160-170°C until it is fluid, add 6 parts of SBS and 16 parts of high-viscosity rubber particles while stirring and emulsifying for 15 minutes;

[0057] 2. The emulsified asphalt is heated to 175-185°C, and 4.5 parts of shallow oil MES are added while stirring. After the addition is completed, stirring is continued for 30 minutes to obtain mixture A;

[0058] 3. Mixture A was transferred to a shearing device, sheared at 175-185°C for 15 min, 0.65 parts of sulfur and 0.08 parts of MOF-801 (Zr) were added, sheared at 175-185°C for 1 h, and dried in an oven at 18°C ​​for 40 min to obtain modified high-viscosity asphalt;

[0059] 4. Take 145 parts of coarse aggregate with a particle size of 2.36-13.2 mm, 39 parts of fine aggregate with a particle size of 0.075-2.36 mm, and 12.5 parts of filler with a particle size less than 0.075 mm, stir and mix at 135°C to 165°C to obtain aggregate;

[0060] 5. Take the modified asphalt and aggregate in a mass ratio of 17:200, stir and mix at 140℃~160℃, and cure at 170℃~190℃ to obtain the ultra-thin overlay asphalt mixture.

[0061] Comparative Example 4

[0062] 1. The difference between this comparative example and Example 1 is that MOF-801(Zr) in step 3 is MIL-101(Fe), and the rest of the implementation is the same as Example 1.

[0063] Comparative Example 5

[0064] 1. Heat 200 parts of high-viscosity asphalt at 160-170°C until it is fluid, add 6 parts of SBS and 16 parts of high-viscosity rubber particles while stirring and emulsifying for 15 minutes;

[0065] 2. The emulsified asphalt is heated to 175-185°C, and 3 parts of shallow oil MES are added while stirring. After the addition is completed, stirring is continued for 30 minutes to obtain mixture A;

[0066] 3. Mixture A was transferred to a shearing device and sheared at 175-185°C for 15 min. 0.65 parts of sulfur and 0.04 parts of MOF-801 (Zr) were added and sheared at 175-185°C for 1 h. The mixture was then dried at 18°C ​​for 40 min to obtain a modified high-viscosity asphalt.

[0067] 4. Take 145 parts of coarse aggregate with a particle size of 2.36-13.2 mm, 39 parts of fine aggregate with a particle size of 0.075-2.36 mm, and 12.5 parts of filler with a particle size less than 0.075 mm, stir and mix at 135°C to 165°C to obtain aggregate;

[0068] 5. Take the modified asphalt and aggregate in a mass ratio of 17:200, stir and mix at 140℃~160℃, and cure at 170℃~190℃ to obtain the ultra-thin overlay asphalt mixture.

[0069] Comparative Example 6

[0070] 1. Heat 200 parts of high-viscosity asphalt at 160-170°C until it is fluid, add 6 parts of SBS and 16 parts of high-viscosity rubber particles while stirring and emulsifying for 15 minutes;

[0071] 2. The emulsified asphalt is heated to 175-185°C, and 3 parts of shallow oil MES are added while stirring. After the addition is completed, stirring is continued for 30 minutes to obtain mixture A;

[0072] 3. Mixture A was transferred to a shearing device and sheared at 175-185°C for 15 min. 0.65 parts of sulfur and 0.12 parts of MOF-801 (Zr) were added and sheared at 175-185°C for 1 h. The mixture was then dried at 18°C ​​for 40 min to obtain a modified high-viscosity asphalt.

[0073] 4. Take 145 parts of coarse aggregate with a particle size of 2.36-13.2 mm, 39 parts of fine aggregate with a particle size of 0.075-2.36 mm, and 12.5 parts of filler with a particle size less than 0.075 mm, stir and mix at 135°C to 165°C to obtain aggregate;

[0074] 5. Take the modified asphalt and aggregate in a mass ratio of 17:200, stir and mix at 140℃~160℃, and cure at 170℃~190℃ to obtain the ultra-thin overlay asphalt mixture.

[0075] Product determination:

[0076] According to Examples 1-3 and Comparative Examples 1-6, ultra-thin overlay asphalt mixture samples were prepared respectively;

[0077] 1. Stability: 50 kg of samples were sampled from each case, and four specimens were prepared for each case according to the standard Marshall test requirements. The stability data were measured using an automatic Marshall tester, and the average value of the four results was taken, as shown in Table 1.

[0078] 2. Water stability (residual stability): 50 kg of samples were sampled from each case, and four specimens were prepared for each case according to the requirements of the immersion Marshall test. The water stability data were measured using an automatic Marshall tester, and the average value of the four results was taken, as shown in Table 1.

[0079] 3. Pendulum value measurement: Samples were taken from each case, and three specimens were prepared for each case. The specimens were subjected to pendulum value measurement using a pendulum friction coefficient tester. Five measurement points were set, and the average value of the five measurement readings at each measurement point represented the pendulum value of the measurement point. The average value of the pendulum values ​​at the five measurement points was used as the final result, as shown in Table 1.

[0080] Table 1 Test results of ultra-thin overlay asphalt mixture

[0081] Stability (kN) Residual stability (%) Swing value (BPN) Example 1 15.8±0.3 94.3±0.9 74.5±1.1 Example 2 15.5±0.6 93.6±1.0 74.3±0.9 Example 3 15.7±0.5 94.1±1.0 74.8±1.3 Comparative Example 1 13.0±0.4 86.7±1.1 62.8±1.2 Comparative Example 2 14.1±0.8 85.8±0.9 65.9±1.2 Comparative Example 3 15.2±0.7 91.4±2.1 73.7±1.0 Comparative Example 4 14.1±0.6 90.3±1.3 71.4±1.2 Comparative Example 5 14.6±0.4 87.2±1.4 72.2±1.1 Comparative Example 6 15.0±0.4 91.8±1.1 73.5±0.9

[0082] Carry out the following tests in the test area according to the construction standards

[0083] Example 4

[0084] 1. Prepare a composite epoxy resin binder, which contains 0.3% bicyclic amidine, 9% vinyl pentamethyl disiloxane, and the rest is epoxy resin;

[0085] 2. Clean the cement concrete pavement to be constructed to remove debris and moisture;

[0086] 3. Take the ultra-thin overlay asphalt mixture prepared in Example 1 and heat it to 175°C-185°C and keep it warm for later use;

[0087] 4. Apply 0.5 kg*m of adhesive on the road surface-2 ;

[0088] 5. When applying the binder, simultaneously spread the ultra-thin overlay asphalt mixture on the surface of the binder layer with a thickness of 1.3 cm;

[0089] 6. After the road surface is paved, use a steel wheel roller to roll it 6 to 8 times;

[0090] 7. After rolling, allow to cool naturally for 1 hour to complete the construction.

[0091] Example 5

[0092] 1. Prepare a composite epoxy resin binder, which contains 0.3% bicyclic amidine, 9% vinyl pentamethyl disiloxane, and the rest is epoxy resin;

[0093] 2. Clean the cement concrete pavement to be constructed to remove debris and moisture;

[0094] 3. Take the ultra-thin overlay asphalt mixture prepared in Example 1 and heat it to 175°C-185°C and keep it warm for later use;

[0095] 4. Apply 0.4 kg*m of adhesive on the road surface -2 ;

[0096] 5. When applying the binder, simultaneously spread the ultra-thin overlay asphalt mixture at 175℃~185℃ on the surface of the binder layer with a thickness of 1.3 cm;

[0097] 6. After the road surface is paved, use a steel wheel roller to roll it 6 to 8 times;

[0098] 7. After rolling, allow to cool naturally for 1 hour to complete the construction.

[0099] Example 6

[0100] 1. Prepare a composite epoxy resin binder, which contains 0.3% bicyclic amidine, 9% vinyl pentamethyl disiloxane, and the rest is epoxy resin;

[0101] 2. Clean the cement concrete pavement to be constructed to remove debris and moisture;

[0102] 3. Take the ultra-thin overlay asphalt mixture prepared in Example 1 and heat it to 175°C-185°C and keep it warm for later use;

[0103] 4. Apply 0.6 kg*m of adhesive on the road surface -2 ;

[0104] 5. When applying the binder, simultaneously spread the ultra-thin overlay asphalt mixture at 175℃~185℃ on the surface of the binder layer with a thickness of 1.3 cm;

[0105] 6. After the road surface is paved, use a steel wheel roller to roll it 6 to 8 times;

[0106] 7. After rolling, allow to cool naturally for 1 hour to complete the construction.

[0107] Comparative Example 7

[0108] 1. Prepare a binder composite epoxy resin, which contains 0.3% bicyclic amidine, 9% silane coupling agent KH-560, and the rest is epoxy resin;

[0109] 2. Clean the cement concrete pavement to be constructed to remove debris and moisture;

[0110] 3. Take the ultra-thin overlay asphalt mixture prepared in Example 1 and heat it to 175°C-185°C and keep it warm for later use;

[0111] 4. Apply 0.5 kg*m of adhesive on the road surface -2 ;

[0112] 5. When applying the binder, simultaneously spread the ultra-thin overlay asphalt mixture at 175℃~185℃ on the surface of the binder layer with a thickness of 1.3 cm;

[0113] 6. After the road surface is paved, use a steel wheel roller to roll it 6 to 8 times;

[0114] 7. After rolling, allow to cool naturally for 1 hour to complete the construction.

[0115] Comparative Example 8

[0116] 1. Prepare a composite epoxy resin binder, which contains 0.3% bicyclic amidine, 9% vinyl pentamethyl disiloxane, and the rest is epoxy resin;

[0117] 2. Clean the cement concrete pavement to be constructed to remove debris and moisture;

[0118] 3. Take the ultra-thin overlay asphalt mixture prepared in Example 1 and heat it to 175°C-185°C and keep it warm for later use;

[0119] 4. Apply 0.2 kg*m of adhesive on the road surface -2 ;

[0120] 5. When applying the binder, simultaneously spread the ultra-thin overlay asphalt mixture at 175℃~185℃ on the surface of the binder layer with a thickness of 1.3 cm;

[0121] 6. After the road surface is paved, use a steel wheel roller to roll it 6 to 8 times;

[0122] 7. After rolling, allow to cool naturally for 1 hour to complete the construction.

[0123] Comparative Example 9

[0124] 1. Prepare a composite epoxy resin binder, which contains 0.3% bicyclic amidine, 9% vinyl pentamethyl disiloxane, and the rest is epoxy resin;

[0125] 2. Clean the cement concrete pavement to be constructed to remove debris and moisture;

[0126] 3. Take the ultra-thin overlay asphalt mixture prepared in Example 1 and heat it to 175°C-185°C and keep it warm for later use;

[0127] 4. Apply 0.8 kg*m of adhesive on the road surface -2 ;

[0128] 5. When applying the binder, simultaneously spread the ultra-thin overlay asphalt mixture at 175℃~185℃ on the surface of the binder layer with a thickness of 1.3 cm;

[0129] 6. After the road surface is paved, use a steel wheel roller to roll it 6 to 8 times;

[0130] 7. After rolling, allow to cool naturally for 1 hour to complete the construction.

[0131] Product determination:

[0132] Experimental measurements were performed on Examples 4-6 and Comparative Examples 7-9 according to the following requirements;

[0133] 1. An ultra-thin overlay was applied to square specimens of cement concrete measuring 100 mm*100 mm. Five specimens were prepared for each case and the bonding strength of the specimens was measured using a universal testing machine. The results were taken as the average value obtained in the test, as shown in Table 2.

[0134] 2. An ultra-thin overlay was constructed on the cement concrete test area, and a noise test was conducted on the test area. The vehicle speed was 50 km / h as the test standard. Two sound level meters were used to measure and read the average value of the maximum reading of the meter pointer. Three experiments were conducted for each case. The results are shown in Table 2.

[0135] Table 2 Construction pilot test results

[0136] Bond strength (MPa) Noise mean (dB) Example 4 1.51±0.06 71.2±1.1 Example 5 1.49±0.03 71.7±1.3 Example 6 1.52±0.05 71.5±1.2 Comparative Example 7 1.32±0.08 75.8±1.4 Comparative Example 8 1.38±0.06 74.3±1.2 Comparative Example 9 1.47±0.05 72.2±1.6

Claims

1. A construction method for an ultra-thin overlay asphalt mixture, characterized in that: The construction method steps are as follows: (1) Clean the cement concrete pavement to be constructed to remove debris and moisture; (2) Apply 0.4~0.6 kg*m of adhesive on the road surface -2 ; (3) When applying the binder, simultaneously spread the ultra-thin overlay asphalt mixture at 175℃~185℃ on the surface of the binder layer with a thickness of 0.8cm~1.8cm; (4) After the pavement is paved, use a steel wheel roller to roll it 6 to 8 times; (5) After rolling, the molding is allowed to cool naturally for 1 hour, and the construction is completed; The binder is a composite epoxy resin, which contains 0.2% to 0.4% of bicyclic amidine, 8% to 10% of vinyl pentamethyl disiloxane, and the rest is epoxy resin.

2. The method for constructing an ultra-thin overlay asphalt mixture as claimed in claim 1, characterized in that: The preparation method of the ultra-thin overlay asphalt mixture is as follows: (1) Heat 200 parts of high-viscosity asphalt at 160-170°C until it becomes fluid, add 4-8 parts of SBS and 12-20 parts of high-viscosity rubber particles while stirring, and emulsify for 15 minutes; (2) The emulsified asphalt is heated to 175-185°C, and 2-4 parts of the solubilizer are added while stirring. After the addition is completed, stirring is continued for 30 minutes to obtain a mixture A. (3) Mixture A was transferred to a shearing device and sheared at 175-185°C for 15 min. 0.5-0.8 parts of sulfur and 0.06-0.1 parts of a deodorizing additive were added and sheared at 175-185°C for 1 h. The mixture was then dried in an oven at 18°C ​​for 40 min to obtain a modified high-viscosity asphalt. (4) 130-160 parts of coarse aggregate with a particle size of 2.36-13.2 mm, 35-43 parts of fine aggregate with a particle size of 0.075-2.36 mm, and 10-15 parts of filler with a particle size less than 0.075 mm are stirred and mixed at 135°C-165°C to obtain aggregate; (5) Take the modified asphalt and aggregate in a mass ratio of 16-18:190-210, stir and mix at 140°C-160°C, and cure at 170°C-190°C to obtain an ultra-thin overlay asphalt mixture.

3. The method for constructing an ultra-thin overlay asphalt mixture as claimed in claim 2, characterized in that: The solubilizing agent is shallow oil extraction MES.

4. The method for constructing an ultra-thin overlay asphalt mixture as claimed in claim 2, characterized in that: The deodorizing additive is MOF-801 (Zr).