Warm-mixing recycled asphalt mixture preparation method

A technology of recycled asphalt and mixture, applied in the direction of climate change adaptation, etc., can solve the problems of late start of regeneration and warm mix technology, accelerated secondary aging of recycled asphalt, poor performance of warm mix regeneration, etc., to solve poor road performance, Enhanced low-temperature deformation ability and reduced harmful gas emissions

Active Publication Date: 2016-02-03
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] my country's regeneration and warm mixing technology started relatively late, and the research on asphalt regeneration technology at home and abroad focuses on the recovery and performance evaluation of asphalt pavement materials, and the regeneration of old materials and the use of regenerants are mostly concentrated on the heat of aging asphalt mixture. Although many research results have been obtained in regeneration and cold regeneration, in the process of hot regeneration, the mixing temperature is high and the utilization rate of RAP is low, which not only accelerates the secondary aging of recycled asphalt, but also consumes a lot of energy, and the volatile gas Pollution of the environment, although the mixing temperature of cold-mix regeneration is low, its road performance is poor
The patent with the publication number CN103556560A uses sulfur additives as a warm mix agent, and the warm mix recycled asphalt mixture only uses new asphalt to regenerate aged asphalt, and the efficiency of warm mix regeneration is poor

Method used

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  • Warm-mixing recycled asphalt mixture preparation method
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  • Warm-mixing recycled asphalt mixture preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The gradation type of the warm-mix recycled asphalt mixture prepared in this example is AC-25, and the target gradation is shown in Table 1. The specific preparation method includes the following steps:

[0032] Step 1. After mixing the regenerant, viscosity reducer, plasticizer and anti-aging agent, melt and shear for 7 minutes at a temperature of 180° C. to obtain a composite regenerant; the mass content of the regenerant in the composite regenerant is 65%, the mass content of the viscosity reducer is 32%, the mass content of the plasticizer is 1.2%, and the mass content of the antiaging agent is 1.8%; the regenerant is aromatic oil, and the viscosity reducer is tall oil , the plasticizer is one or both of epoxidized soybean oil and hydrogenated castor oil, and the anti-aging agent is one or both of N, N'-xylyl-p-phenylenediamine and anti-aging agent RD two kinds;

[0033] Step 2, after mixing the warm mixing agent, solubilizer and composite surfactant, stir for 8 mi...

Embodiment 2

[0046] The method for preparing the warm-mix recycled asphalt mixture in this example is the same as that of Example 1, except that the plasticizer is hydrogenated castor oil, or a mixture of epoxidized soybean oil and hydrogenated castor oil, and the plasticizer is hydrogenated castor oil. The aging agent is anti-aging agent RD, or a mixture of N, N'-xylyl-p-phenylenediamine and anti-aging agent RD;

[0047] The warm mixing agent is polyethylene wax or microcrystalline wax, or two or three of polyethylene wax, oxidized polyethylene wax and microcrystalline wax; the melting range of the polyethylene wax is preferably 100° C. to 110° C. ℃.

Embodiment 3

[0049] The gradation type of the warm-mix recycled asphalt mixture prepared in this example is AC-25, and the target gradation is shown in Table 1. The specific preparation method includes the following steps:

[0050] Step 1. After mixing the regenerant, viscosity reducer, plasticizer and antiaging agent, melt and shear for 8 minutes at a temperature of 175° C. to obtain a composite regenerant; the mass content of the regenerant in the composite regenerant is 67%, the mass content of the viscosity reducer is 30%, the mass content of the plasticizer is 1.4%, and the mass content of the antiaging agent is 1.6%; the regenerant is aromatic oil, and the viscosity reducer tall oil, The plasticizer is epoxy soybean oil, and the anti-aging agent is N, N'-xylyl-p-phenylenediamine;

[0051] Step 2, after mixing the warm mixing agent, solubilizer and composite surfactant, stir for 8 minutes at a temperature of 120° C. to obtain a composite warm mixing agent; the mass content of the warm...

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Abstract

The invention discloses a warm-mixing recycled asphalt mixture preparation method which comprises the following steps: I, preparing a compound regenerant; II, preparing a compound warm-mixing agent; III, measuring the mass content and natural gradation of old asphalt in an RAP material and respectively determining mass ratios of novel aggregate and novel mineral powder which are required for preparing the warm-mixing recycled asphalt mixture to the RAP material; IV, preparing a warm-mixing recycled asphalt mixture sample and determining an optimum asphalt-aggregate ratio of the warm-mixing recycled asphalt mixture; V, under the condition of the optimum asphalt-aggregate ratio, preparing the warm-mixing recycled asphalt mixture. According to the invention, the recycling rate of the RAP material reaches 70% or above, meanwhile, secondary aging of the asphalt mixture is avoided, the advantages of energy saving and carbon emission and harmful gas emission reduction are realized and the warm-mixing recycled asphalt mixture prepared through the preparation method has good pavement performance.

Description

technical field [0001] The invention belongs to the technical field of road engineering asphalt mixture preparation, and in particular relates to a preparation method of warm-mixed recycled asphalt mixture. Background technique [0002] With the rapid development of my country's transportation industry, a network of trunk roads with expressways as the skeleton has basically formed, and the mileage of highways has continued to increase. Asphalt pavement has an absolute advantage in the high-grade roads built in recent years. On the one hand, a large number of asphalt pavements are still under construction, resulting in a shortage of road asphalt and gravel materials in my country; on the other hand, a large number of asphalt pavements have entered the renovation stage. A large amount of old materials are not only difficult to stack, but also cause serious pollution to soil and water if not handled properly. Therefore, how to deal with old road materials is an urgent problem to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B24/12C04B24/32
CPCY02A30/30
Inventor 郝培文张海伟李永翔唐成翟瑞鑫文科贺玲娟
Owner CHANGAN UNIV
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