Hot mix plant recycling construction process for waste rubber asphalt pavement

Abstract

The invention discloses a hot mix plant recycling construction process for a waste rubber asphalt pavement. The construction process comprises the following steps: firstly cleaning a road surface, and then performing layered milling; detecting the water content of the milled old material by using a monitoring accelerant; extracting and sampling asphalt in the milled old material, respectively adding viscosity-reducing restorers in different proportions for index testing, and determining the adding proportion; heating, stirring and uniformly mixing the milled old material, the SBS supplement and the viscosity reduction restorer; heating, stirring and uniformly mixing the new aggregate, the SBS supplement and the rubber asphalt supplement; mixing the milled old material with the new aggregate, adding a reinforcing and toughening agent, and then paving and rolling. When all the added materials are applied to hot mix plant regeneration construction, the technical problems that in hot mix plant regeneration of the rubber asphalt pavement, the variability of a milling material is large, the water content is difficult to monitor, the regeneration construction of a rubber asphalt mixture is difficult, and the regeneration recovery of a rubber asphalt cementing material is difficult can be solved, and the hot mix plant regeneration application of the waste rubber asphalt pavement with high quality is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal regeneration of waste rubber asphalt pavement, and in particular relates to a factory-mixed thermal regeneration construction process of waste rubber asphalt pavement. Background Art

[0002] Asphalt pavement regeneration technology has multiple advantages of recycling resources, saving energy and protecting the environment. Factory-mixed hot regeneration is a process in which a certain amount of new aggregate and new asphalt are added to the RAP after crushing, screening and other pre-treatments in the mixing plant, and then heated and mixed to make the recycled material into an excellent recycled asphalt mixture. The factory-mixed hot regeneration technology of waste rubber asphalt pavement combines the high performance of rubber asphalt binder with the environmental advantages of recycling old materials, and has good engineering value and environmental benefits.

[0003] At present, the quality factory-mixed hot recycling of waste rubber asphalt pavement has the following problems: large performance differences of RAP materials, difficulty in controlling variability, inefficient and inconvenient detection of moisture content of RAP materials, difficulty in restoring the performance of aged rubber asphalt binder, high viscosity of waste rubber asphalt mixture, great difficulty in recycling construction, fast cooling of factory-mixed hot recycling construction, narrow temperature window range for pavement paving, compaction and other operations, high mixing rate of new aggregate in recycled mixture, and the need to strengthen the anti-skid performance of aggregates when applied to the upper layer. How to solve the above problems and achieve excellent performance of factory-mixed hot recycled rubber asphalt paving is an important measure to promote the development of green road construction. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a construction process for factory-mixed hot regeneration of waste rubber asphalt pavement.

[0005] The waste rubber asphalt pavement factory-mixed hot regeneration construction process is: (1) First, clean the rubber asphalt pavement to be recycled, then mill the pavement layer by layer at a milling speed of 5-15 km / h. The milled old materials of different pavement layers are crushed, screened, and stored separately; (2) Place the monitoring accelerator in different moisture content environments, record the color change of the monitoring accelerator in different moisture content environments, and form a standard control card; then place the monitoring accelerator in the milling waste materials obtained from different pavement layers, observe the color change of the monitoring accelerator and compare it with the standard control card, dry the milling waste materials with a moisture content greater than 3%, or increase the mixing temperature accordingly in the factory mixing process; (3) Extract and sample the asphalt in the milled waste material, then add the viscosity reducing and restoring agent of the rubber asphalt regeneration agent to the extracted asphalt sample in different proportions for index testing, and determine the addition ratio of the viscosity reducing and restoring agent based on the test results; (4) Heat the milled old material at 170-185°C according to the designed gradation and stir to mix evenly, then add the SBS supplement of the rubber asphalt regeneration agent and stir evenly, the amount of SBS supplement added shall not exceed 0.1-5% of the mass of the milled old material; then add the viscosity reducing recovery agent according to the proportion determined in step (3) and disperse evenly; (5) Heat the new aggregate at 180-195℃ according to the designed gradation and stir evenly, then add the SBS supplement of the rubber asphalt regeneration agent and stir and mix evenly, the amount of SBS supplement added shall not exceed 0.1-5% of the mass of the new aggregate; then add the rubber asphalt supplement of the rubber asphalt regeneration agent and stir and mix evenly, the amount of rubber asphalt supplement added shall be 3-8% of the mass of the new aggregate; (6) The milled old material processed in step (4) is mixed evenly with the new aggregate processed in step (5), wherein the new aggregate accounts for 30-80% of the total mixed material mass; then, mineral powder accounting for 3-5% of the total mixed material mass is added, and the mixture is stirred and mixed evenly; (7) Before paving, the reinforcing toughening agent of the rubber asphalt regeneration agent is added to the mixture of step (6) and mixed evenly, and then directly paved and rolled. After the road surface is naturally cooled, the factory-mixed hot recycling construction of the waste rubber asphalt pavement is completed.

[0006] The monitoring accelerator is one or more of cobalt chloride, cobalt bromide, cobalt nitrate, cobalt iodide and cobalt sulfate. The added amount of the monitoring accelerator is 0.01-1% of the sum of the mass of asphalt in the milling waste material and the mass of the rubber asphalt supplement.

[0007] The rubber asphalt regeneration agent consists of four components: a viscosity reducing recovery agent, an SBS supplementer, a rubber asphalt supplementer and a toughening and enhancing agent.

[0008] The viscosity reducing and restoring agent is composed of a softening component, an oil component, a plastic and soft component and a repair component in a mass ratio of 30-70:1-20:1-10:1-10. The added amount of the viscosity reducing and restoring agent is 1-30% of the mass of the asphalt extracted from the milling waste material.

[0009] The softening component is one or more of aromatic oil, waste oil, waste engine oil, extracted oil, base oil, catalytic cracking slurry, vegetable oil and rubber oil.

[0010] The oil component is one or more of ESO, rapeseed oil, castor oil, wood oil and palm oil.

[0011] The plastic softening component is one or more of 2.2'-dibenzamidodiphenyl disulfide, peptizer A86, peptizer CPA, peptizer HTA, pentachlorothiophenol, plasticizer A composed of a mixture of saturated and unsaturated fatty acid zinc salts, and zinc isooctanoate.

[0012] The repair component is one or more of 1,4-butanediol diglycidyl ether, hexamethylene diisocyanate, 4,4-diphenylmethane diisocyanate, epoxidized butadiene, polymethylene polyphenyl isocyanate, and trimethylolpropane triglycidyl ether.

[0013] The SBS extender is a dry process SBS modifier.

[0014] The preparation method of the rubber asphalt supplement is as follows: firstly, the base asphalt is heated to 160-200°C, then the rubber powder is added and stirred for 30-100 minutes, then the viscosity reducing wax is added and stirred for 15-45 minutes, and finally the anti-aging agent is added and stirred for 15-30 minutes to mix evenly. The mass ratio of the base asphalt, the rubber powder, the viscosity reducing wax and the anti-aging agent is 100:5-30:1-5:0.1-5.

[0015] The matrix asphalt is one or more of 70#, 90#, and 110# petroleum asphalt.

[0016] The rubber powder is one of vulcanized rubber powder and rubber powders with different desulfurization degrees, or a mixture of several of them.

[0017] The viscosity reducing wax is one or more of PE wax, FT wax, oxidized PE wax and microcrystalline wax.

[0018] The anti-aging agent is one or more of the group consisting of anti-aging agent NDBC-75, anti-aging agent LIGFLEX601-75, anti-aging agent TMQ, anti-aging agent IPPD (4010NA), anti-aging agent 8PPD, anti-aging agent DTPD, anti-aging agent 2246, anti-aging agent 77P, anti-aging agent 44PD, and anti-aging agent EPPD.

[0019] The strengthening and toughening agent is composed of a vulcanizing agent, a vulcanization accelerator and a vulcanization balancer in a mass ratio of 1-10:1-5:1-5. The addition amount of the strengthening and toughening agent is 0.3-3% of the sum of the mass of the asphalt in the milling waste material and the mass of the rubber asphalt supplementer.

[0020] The vulcanizing agent is one or more of sulfur, one-component low-temperature platinum vulcanizing agent, xanthate sulfide WL-101, 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, tetrabutylthiuram disulfide, and piperidine pentamethylene dithiocarbamate.

[0021] The vulcanization accelerator is one or more of accelerator ZDBC, accelerator SDBC, accelerator DIP, accelerator CPB, accelerator ZIP, accelerator ZBX, accelerator SIX, zinc oxide, accelerator DPTU, and thiazole vulcanization accelerator M.

[0022] The vulcanization balance agent is one or more of Si-17, coupling agent Si69-50, 1,3-bis(citricarboxylic imide methyl)benzene, and hexamethylene dithiosulfate disodium dihydrate.

[0023] When paving the upper layer of the road surface, the new aggregate is selected from one or more of basalt, diabase, and bauxite. When paving the middle and lower layers, there is no requirement for the type of new aggregate.

[0024] The beneficial effects of the factory-mixed hot regeneration construction process of waste rubber asphalt pavement of the present invention are as follows: The standardized fine milling process with dual control of "milling depth + milling speed" in the factory-mixed hot regeneration process of the present invention combined with the storage measures of classification and grading can effectively control the variability of the milled material.

[0025] The monitoring promoter in the factory-mixed hot regeneration process of the present invention is mainly cobalt salt, and its color-changing property when exposed to water can facilitate intuitive understanding of the moisture content of the stockpiled milling materials. When a significant color change occurs, it indicates that the moisture content in the milling materials is too high. Therefore, measures such as drying and dehydration or increasing the heating temperature of this batch of milling materials during construction can be taken to achieve the goal of reasonably controllable moisture content of the milling materials in factory-mixed hot regeneration.

[0026] Under the implementation of the regeneration process of the present invention, the four components of the rubber asphalt regeneration agent, namely, the viscosity reducing and restoring agent, the SBS supplement, the rubber asphalt supplement and the strengthening and toughening agent, can, on the one hand, perform component blending and restoration and network structure remodeling of the aged rubber asphalt binder; on the other hand, in view of the objective reality that the pavement cools down quickly and the temperature window range is narrow during construction operation during factory-mixed hot regeneration, it can meet the technical needs of mixing low viscosity, easy construction and rapid improvement of paving strength in the factory-mixed hot regeneration process of waste rubber asphalt pavement.

[0027] The viscosity reducing and restoring agent added in the factory-mixed hot regeneration process of the present invention can blend and regenerate the aged matrix asphalt, accelerate the desulfurization and cross-linking reaction process of the rubber powder modified asphalt, thereby reducing the viscosity of the binder system, increasing the factory-mixed hot regeneration process and workability, and can also repair the structure of SBS and rubber powder aging degradation products. The functions of each component in the viscosity reducing and restoring agent are as follows: It contains a large number of light components, which can achieve the component blending and restoration of the aged matrix asphalt system, and also reduce the viscosity of the binder system. The highly polar oil component in the softening component will promote the dispersion of asphaltene in the aged asphalt, improve the permeability while reducing the viscosity of the system and increasing the fluidity. In addition, the epoxy group after ring opening can reconnect the broken SBS and rubber powder segments to achieve structural recovery. The plastic and soft components can break the rubber macromolecular chain, shorten the molecular chain, reduce the molecular weight of the raw rubber, improve the plasticity, and significantly reduce the viscosity of the aged rubber asphalt binder system. In response to the degradation problem of SBS and rubber powder during construction and service, the isocyanate group and epoxy group contained in the repair component can react with the active groups such as hydroxyl and carboxyl in the degradation product, prompting the broken SBS segments and the degraded rubber powder to reconnect, and generate new molecular chains with greater rigidity through chemical reactions to achieve spatial network structure remodeling.

[0028] The SBS supplement added in the factory-mixed hot regeneration process of the present invention can avoid the construction difficulties of wet-process SBS modified asphalt that needs to be re-prepared and processed and is difficult to evenly disperse into the aged binder system. The dry construction method can more conveniently and efficiently reshape the comprehensive road performance of the recycled rubber asphalt pavement.

[0029] The rubber asphalt supplementer added to the factory-mixed hot regeneration process of the present invention can supplement the warm-mixed fresh rubber asphalt binder with reduced viscosity, which can not only improve the overall quality of the recycled mixture, but also form a stepped aging. The viscosity-reducing wax can not only reduce the viscosity of the rubber asphalt system, but also delay the aging of rubber powder as a physical antioxidant for rubber materials. Anti-aging agents can delay the aging process of recycled rubber asphalt binders and mixtures during service, enhance anti-aging capabilities, and extend the service life of the pavement. The proportion of new aggregates added in the factory-mixed hot regeneration process is relatively high, and the three aggregates of basalt, diabase and bauxite have excellent anti-skid properties. When used as new aggregates for paving the upper layer of recycled pavement, the anti-skid properties can be significantly improved.

[0030] The reinforcing toughening agent in the factory-mixed hot regeneration process of the present invention is particularly suitable for environments where the factory-mixed hot regeneration has fast heat dissipation and a narrow construction window, and can quickly achieve the effect of improving the strength of the regenerated rubber asphalt pavement. The vulcanizing agent and vulcanization accelerator in the reinforcing toughening agent realize the conversion of the aforementioned de-crosslinked linear rubber macromolecules into a three-dimensional network structure through chemical crosslinking, and the vulcanization balance agent is used to balance the vulcanization system and eliminate the phenomenon of vulcanization reversion. The vulcanizing agent and the vulcanization accelerator are added before the factory-mixed hot regeneration paving, which avoids the problem of difficult mixing of the regenerated binder caused by the vulcanization reaction in the mixing stage, and will not affect the implementation of the mixing process. In addition, the vulcanizing agent and the vulcanization accelerator used in this technology are additives that can achieve rapid and ultra-fast vulcanization in low and medium temperature environments, and can achieve the rapid reconstruction of the three-dimensional network structure of the regenerated binder system in the rolling stage, while ensuring the restoration of the strength and stability of the aged binder, while improving the overall performance of the regenerated pavement.

[0031] Moreover, the monitoring accelerator in the factory-mixed hot regeneration process of the present invention can also be used as a vulcanization accelerator to accelerate the vulcanization reaction rate in the process. The cobalt salt in the monitoring accelerator can react with the active sites such as double bonds in the rubber powder, and can accelerate the cross-linking reaction rate between molecular chains during the vulcanization process, so that the rubber can be transformed from a linear structure to a three-dimensional network structure more quickly, shortening the vulcanization time, which is particularly suitable for the technical needs of the factory-mixed hot regeneration of this scheme. In addition, the cobalt salt in the monitoring accelerator can increase the number and cross-linking density of the rubber cross-linking points, improve the degree of vulcanization of the rubber asphalt binder system, and the cobalt ions can also delay the aging caused by heat and oxygen, thereby achieving the improvement of the comprehensive performance of the recycled rubber asphalt binder and the mixture.

[0032] In summary, the present invention achieves the technical goal of low viscosity and easy mixing in the mixing stage of factory-mixed hot-regenerated rubber asphalt pavement, and increased viscosity and strength in the rolling and paving stage. The chain desulfurization of the viscosity-reducing recovery agent and the ultra-fast vulcanization of the toughening agent at medium and low temperatures realize the staged controllable desulfurization and vulcanization of the binder in the factory-mixed hot regeneration technology of rubber asphalt pavement. The step-by-step implementation of the method of the present invention with different materials realizes the high-quality factory-mixed hot regeneration application of waste rubber asphalt pavement. DETAILED DESCRIPTION

[0033] Example 1 Background: The upper surface of a project is 4cm, with a grading of ARAC-13, and the middle surface is 6cm, with a grading of ARAC-20. Both the upper and middle surface layers are rubber asphalt pavement. The paving binder is a rubber powder composite SBS modified asphalt binder, with the vulcanized rubber powder and SBS admixtures of 20% and 2.5% respectively. Since the service pavement has cracks, pockmarks, local looseness and other diseases, affecting driving comfort and safety, it is necessary to carry out factory-mixed hot recycling of the waste rubber asphalt pavement on the upper and middle surface layers of this section of road.

[0034] Preparation of viscosity reducing and restoring agent: 50 parts by mass of extracted oil, 10 parts by mass of waste oil, 12 parts by mass of ESO, 3 parts by mass of rapeseed oil, 0.5 parts by mass of 2.2'-dibenzamidodiphenyl disulfide, 1 part by mass of peptizer HTA, 5 parts by mass of 1,4-butanediol diglycidyl ether and 5 parts by mass of hexamethylene diisocyanate were mixed evenly.

[0035] Prepare rubber asphalt supplement: first heat 100 parts by mass of 90# base asphalt to 180°C, then add 15 parts by mass of vulcanized rubber powder and stir for 60 minutes, then add 3 parts by mass of FT wax and continue stirring for 30 minutes, finally add 1 part by mass of anti-aging agent TMQ and 0.5 parts by mass of anti-aging agent IPPD (4010NA) and stir for 20 minutes to mix evenly.

[0036] Preparation of reinforcing toughening agent: Mix 1 part by mass of sulfur, 1 part by mass of xanthate sulfide (WL-101), 0.8 part by mass of accelerator ZDBC, 0.7 part by mass of accelerator SDBC, 0.5 part by mass of Si-17 and 0.5 part by mass of coupling agent Si69-50.

[0037] Factory-mixed hot recycling construction process: (1) First, the reclaimed road surface is cleaned and the pre-construction preparation work is completed. Then, the old road surface is subjected to standardized fine milling work with dual control of "milling depth + milling speed" to reduce the variability of the milled material. The milling speed of the upper layer is 12 km / h, and the milling speed of the middle layer is 9 km / h. After the milling of the old materials from different road layers is completed, they are crushed and screened and stored in three grades.

[0038] (2) Place cobalt chloride in different moisture content environments, record the color change of cobalt chloride in different moisture content environments, and form a standard control card; place cobalt chloride inside each milling waste pile to monitor the moisture content of the pile, observe the color change of cobalt chloride in the milling waste pile and compare it with the standard control card. One of the three milling waste piles showed a color change with a moisture content of more than 3%. Therefore, this pile was dried separately to a moisture content of less than 3% before use. The amount of cobalt chloride added was 0.4% of the sum of the mass of asphalt in the milling waste and the mass of rubber asphalt supplement.

[0039] (3) The asphalt in the old milling material was extracted, and the viscosity reducer was added to the extracted asphalt at a ratio of 5-15%. The recovery of the extracted rubber asphalt binder by different dosages of the viscosity reducer was investigated. After the test, the dosage of the viscosity reducer was determined to be 10% of the mass of the asphalt in the old milling material.

[0040] (4) The milling waste material designed according to the grading is heated and stirred at 180°C in the 1# mixing tank of the factory-mixed hot regeneration device, and a dry SBS modifier accounting for 0.3% of the mass of the milling waste material in the 1# mixing tank is added and stirred evenly. Then, the viscosity reducing and restoring agent is added to the 1# mixing tank according to the dosage determined in step (3) and dispersed evenly.

[0041] (5) The supplementary diabase new aggregate according to the grading design is heated at 190°C in the 2# mixing tank of the factory hot regeneration device and stirred evenly. The dry SBS modifier accounting for 2.5% of the mass of the new diabase aggregate in the 2# mixing tank is added and stirred. Then, the rubber asphalt supplementer accounting for 5.5% of the mass of the new aggregate in the 2# mixing tank is added to the 2# mixing tank and mixed evenly with the new aggregate.

[0042] (6) Mix the mixture in the 1# mixing tank and the 2# mixing tank in a mass ratio of 25:75 in the factory-mixed hot regeneration mixing pot, then add mineral powder accounting for 4% of the mass of the mixture, continue to stir and mix evenly, and load the above mixture onto a truck and transport it to the road surface to be constructed.

[0043] (7) Before unloading the vehicle at the section to be constructed, add the strengthening and toughening agent into the mixture in step (6), mix and disperse it evenly. The added mass of the strengthening and toughening agent = (the mass of asphalt in the milled old material + the mass of the rubber asphalt supplement) * 1%. Then, carry out subsequent construction processes such as paving and rolling. After the road surface cools down, complete the construction work of the plant-mixed hot recycling of the rubber asphalt pavement.

[0044] The quality inspection results of the upper and middle surfaces of the rubber asphalt pavement when it is paved and the pavement after being treated by the plant-mixed hot recycling of this technology are shown in Table 1 and Table 2.

[0045] Table 1 Quality inspection results of the upper surface layer of the original paved rubber asphalt pavement and the plant-mixed hot recycled rubber asphalt pavement

[0046] Table 2 Quality inspection results of the middle surface layer of the original paved rubber asphalt pavement and the plant-mixed hot recycled rubber asphalt pavement

Claims

1. A construction process for hot regeneration of waste rubber asphalt pavement, characterized in that: The specific operations of the construction process are: (1) First, clean the rubber asphalt pavement to be recycled, then mill the pavement layer by layer at a milling speed of 5-15 km / h. The milled old materials of different pavement layers are crushed, screened, and stored separately; (2) Place the monitoring accelerator in different moisture content environments, record the color change of the monitoring accelerator in different moisture content environments, and form a standard control card; then place the monitoring accelerator in the milling waste materials obtained from different pavement layers, observe the color change of the monitoring accelerator and compare it with the standard control card, dry the milling waste materials with a moisture content greater than 3%, or increase the mixing temperature accordingly in the factory mixing process; (3) Extract and sample the asphalt in the milled waste material, then add the viscosity reducing and restoring agent of the rubber asphalt regeneration agent to the extracted asphalt sample in different proportions for index testing, and determine the addition ratio of the viscosity reducing and restoring agent based on the test results; (4) Heat the milled old material at 170-185°C according to the designed gradation and stir to mix evenly, then add the SBS supplement of the rubber asphalt regeneration agent and stir evenly, the amount of SBS supplement added shall not exceed 0.1-5% of the mass of the milled old material; then add the viscosity reducing recovery agent according to the proportion determined in step (3) and disperse evenly; (5) Heat the new aggregate at 180-195℃ according to the designed gradation and stir evenly, then add the SBS supplement of the rubber asphalt regeneration agent and stir and mix evenly, the amount of SBS supplement added shall not exceed 0.1-5% of the mass of the new aggregate; then add the rubber asphalt supplement of the rubber asphalt regeneration agent and stir and mix evenly, the amount of rubber asphalt supplement added shall be 3-8% of the mass of the new aggregate; (6) The milled old material processed in step (4) is mixed evenly with the new aggregate processed in step (5), wherein the new aggregate accounts for 30-80% of the total mixed material mass; then, mineral powder accounting for 3-5% of the total mixed material mass is added, and the mixture is stirred and mixed evenly; (7) Before paving, the reinforcing toughening agent of the rubber asphalt regeneration agent is added to the mixture of step (6) and mixed evenly, and then directly paved and rolled. After the road surface is naturally cooled, the factory-mixed hot recycling construction of the waste rubber asphalt pavement is completed.

2. The construction process according to claim 1, characterized in that: The monitoring accelerator is one or more of cobalt chloride, cobalt bromide, cobalt nitrate, cobalt iodide, and cobalt sulfate; the added amount of the monitoring accelerator is 0.01-1% of the sum of the mass of asphalt in the milling waste material and the mass of the rubber asphalt supplementer.

3. The construction process according to claim 1, characterized in that: The viscosity reducing and restoring agent is composed of a softening component, an oil component, a plastic and soft component and a repair component in a mass ratio of 30-70:1-20:1-10:1-10; the added amount of the viscosity reducing and restoring agent is 1-30% of the mass of the asphalt extracted from the milling waste material.

4. The construction process according to claim 3, characterized in that: The softening component is one or more of aromatic oil, waste oil, waste engine oil, extracted oil, base oil, catalytic cracking slurry, vegetable oil, and rubber oil; The oil component is one or more of ESO, rapeseed oil, castor oil, wood oil, and palm oil; The plastic softening component is one or more of 2.2'-dibenzamidodiphenyl disulfide, peptizer A86, peptizer CPA, peptizer HTA, pentachlorothiophenol, plasticizer A composed of a mixture of saturated and unsaturated fatty acid zinc salts, and zinc isooctanoate; The repair component is one or more of 1,4-butanediol diglycidyl ether, hexamethylene diisocyanate, 4,4-diphenylmethane diisocyanate, epoxidized butadiene, polymethylene polyphenyl isocyanate, and trimethylolpropane triglycidyl ether.

5. The construction process according to claim 1, characterized in that: The SBS extender is a dry process SBS modifier.

6. The construction process according to claim 1, characterized in that: The preparation method of the rubber asphalt supplement is as follows: firstly, heating the base asphalt to 160-200° C., then adding rubber powder and stirring for 30-100 minutes, then adding viscosity reducing wax and continuing to stir for 15-45 minutes, and finally adding an anti-aging agent and stirring for 15-30 minutes to mix evenly; the mass ratio of the base asphalt, the rubber powder, the viscosity reducing wax and the anti-aging agent is 100:5-30:1-5:0.1-5.

7. The construction process according to claim 6, characterized in that: The anti-aging agent is one or more of the group consisting of anti-aging agent NDBC-75, anti-aging agent LIGFLEX601-75, anti-aging agent TMQ, anti-aging agent IPPD, anti-aging agent 8PPD, anti-aging agent DTPD, anti-aging agent 2246, anti-aging agent 77P, anti-aging agent 44PD, and anti-aging agent EPPD.

8. The construction process according to claim 1, characterized in that: The reinforcing toughening agent is composed of a vulcanizing agent, a vulcanization accelerator and a vulcanization balancer in a mass ratio of 1-10:1-5:1-5; the added amount of the reinforcing toughening agent is 0.3-3% of the sum of the mass of asphalt in the milling waste material and the mass of the rubber asphalt supplementer.

9. The construction process according to claim 8, characterized in that: The vulcanizing agent is one or more of sulfur, one-component low-temperature platinum vulcanizing agent, xanthate sulfide WL-101, 1,1-di-tert-butyl peroxy-3,3,5-trimethylcyclohexane, tetrabutylthiuram disulfide, and piperidine pentamethylene dithiocarbamate; The vulcanization accelerator is one or more of accelerator ZDBC, accelerator SDBC, accelerator DIP, accelerator CPB, accelerator ZIP, accelerator ZBX, accelerator SIX, zinc oxide, accelerator DPTU, and thiazole vulcanization accelerator M; The vulcanization balance agent is one or more of Si-17, coupling agent Si69-50, 1,3-bis(citricarboxylic imide methyl)benzene, and hexamethylene dithiosulfate disodium dihydrate.

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