Plant-mixed warm recycled asphalt mixture and preparation method thereof

A technology for recycling asphalt and mixtures, which is applied in building insulation materials, building components, buildings, etc. It can solve the problems of water stability, low temperature performance and fatigue life decline, poor mixture uniformity, graying materials, etc., and improve the regeneration effect , change the mixing order, and improve road performance

Inactive Publication Date: 2016-10-12
JIANGSU TIANNUO ROAD MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional mixing process does not take into account the interaction between new asphalt and aged asphalt in old materials, and the close combination needs to be fully completed under specific temperature and time conditions. The extent to which the aggregate is coated with asphalt is different. The asphalt film of the new aggregate is often thin, while the asphalt film of the old aggregate is thick. On the other hand, the new asphalt and the aged asphalt in the old material are not completely fused and attached to the surface of the aged asphalt, resulting in the road performance of the aged asphalt cannot be fully improved and regenerated. The two kinds of asphalt play their original roles in the mixture system. some features
As a result, the comprehensive road performance of recycled asphalt mixture is seriously affected, especially the water stability, low temperature performance and fatigue life are greatly reduced compared with asphalt mixture using all new materials.

Method used

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  • Plant-mixed warm recycled asphalt mixture and preparation method thereof
  • Plant-mixed warm recycled asphalt mixture and preparation method thereof
  • Plant-mixed warm recycled asphalt mixture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The embodiment of indoor test: the old broken asphalt pavement (RAP) used in the test is the material of the same source and the same particle size specification. At first, the RAP is sampled in the mixing plant, and then according to the "Highway Engineering Asphalt and Asphalt Mixture Test Regulations" (JTG The method of T 0735 in E20-2011) carries out asphalt content test, and the asphalt ratio that test records this RAP is 4.81%, and the old ore material that test is obtained is carried out sieving test, and sieving test result is shown in Table 1; T 0726 in "Test Regulations for Asphalt and Asphalt Mixture" (JTG E20-2011)

[0029] The extraction test was carried out on RAP by the method, and the old asphalt after the extraction test was recovered, and the performance test was carried out. The test results are shown in Table 2.

[0030] Table 1 Results of old ore grading test in RAP

[0031]

[0032] Table 2 Test results of old asphalt performance indicators in ...

Embodiment 2

[0069] This embodiment is basically the same as the above-mentioned embodiment 1, the difference is:

[0070] (1) In this embodiment, the amount of new asphalt accounted for 2.23% of the mass percentage of the plant-mixed warm and regenerated asphalt mixture, and the kinematic viscosity at 60°C of the regenerant is 50mm 2 / s domestic regenerant (RA5 type regenerant produced by Jiangsu Tiannuo Road Material Technology Co., Ltd.), the amount of regenerant accounted for 0.38% of the mass percentage of high-performance warm recycled asphalt mixture.

[0071] (2) The heating temperature of RAP is 80°C, the heating temperature of new aggregate is 90°C, and the heating temperature of regenerant is 50°C.

[0072] (3) Divide the mixed material out of the pot into 7 equal samples (W0, W1, W2, W3, W4, W5, W6), and store them in a dedicated growth chamber at 40°C. W0 grows for 0h, W1 grows for 1h, W2 developed for 2 hours, W3 developed for 3 hours, W4 developed for 4 hours, W5 developed ...

Embodiment 3

[0088] This embodiment is basically the same as the above-mentioned embodiment 1, the difference is:

[0089] (1) In this example, the amount of new asphalt accounted for 2.37% of the mass percentage of the plant-mixed warm and regenerated asphalt mixture, and the kinematic viscosity at 60°C of the regenerant is 11520mm 2 / s domestic regenerant (RA250 regenerant produced by Jiangsu Tiannuo Road Material Technology Co., Ltd.), the amount of regenerant accounted for 0.30% of the mass percentage of high-performance warm recycled asphalt mixture.

[0090] (2) The heating temperature of RAP is 130°C, the heating temperature of new aggregate is 170°C, and the heating temperature of regenerant is 80°C.

[0091] (3) Divide the mixed material out of the pot into 7 equal samples (X0, X1, X2, X3, X4, X5, X6), and store them in a special growth chamber at 130°C. X0 grows for 0h, X1 grows for 1h, X2 developed for 2 hours, X3 developed for 3 hours, X4 developed for 4 hours, X5 developed fo...

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Abstract

The invention relates to a road surface construction material, in particular to a plant-mixed warm recycled asphalt mixture and a preparation method thereof. The plant-mixed warm recycled asphalt mixture comprises the following components in percentage by mass: (20-70)% of RAP, (0 to 8)% of new aggregate, (0 to 8)% of limestone mineral powder, (0.5 to 5)% of new asphalt and (0 to 0.5)% of recycling agent, wherein the total mass percentage is 100%, the new asphalt has penetration of less than 75 (0.1mm) and a softening point of more than 48 DEG C, and the recycling agent has kinematic viscosity of (50-60000) mm2 / s at a temperature of 60 DEG C. The plant-mixed warm recycled asphalt mixture provided by the invention has the advantages of simple process, no grey material, good recycling effect, low cost, wide adaptability and good road performance.

Description

technical field [0001] The invention relates to pavement construction materials, in particular to a plant-mixed warm-heated recycled asphalt mixture and a preparation method thereof. Background technique [0002] Traditionally, in the maintenance and repair of old asphalt pavement, a large number of excavated and milled asphalt mixtures are discarded. On the one hand, it causes environmental pollution. It is said to be a waste of resources, and with the large-scale use of new stone materials and the mining of stone mines, it will lead to serious ecological environment damage such as forest vegetation reduction and soil erosion. [0003] Plant-mixed hot recycling technology is the most common method of asphalt pavement regeneration in the world. It first mills the old asphalt concrete pavement material and transports it back to the factory. , asphalt aging degree, crushed stone gradation and other indicators, mixed with a certain amount of new aggregate, asphalt and regenera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08K3/26C08K3/34
CPCC08L95/00C08L2205/025C08L2207/22C08L2555/34C08K2003/265C08K3/34
Inventor 郭兆民封昕潘亚军李秋飞柳卫军肖护兵张玉贞
Owner JIANGSU TIANNUO ROAD MATERIAL TECH
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