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High-doping-amount RAP hot mix plant recycled modified asphalt mixture and preparation method thereof

A technology for modifying asphalt and mixtures, applied in climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of poor performance of recycled mixtures, high RAP preheating temperature, and low RAP added value, etc. Achieve the effect of improving performance, strong practicability and wide applicability

Active Publication Date: 2021-11-26
湖南省交通科学研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a high-volume RAP plant-mixed heat-regenerated modified asphalt mixture and its preparation method, aiming to solve the above-mentioned poor performance of the recycled mixture, low added value of RAP and low mixing ratio, and the problem of RAP Technical problem with high preheating temperature

Method used

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  • High-doping-amount RAP hot mix plant recycled modified asphalt mixture and preparation method thereof
  • High-doping-amount RAP hot mix plant recycled modified asphalt mixture and preparation method thereof
  • High-doping-amount RAP hot mix plant recycled modified asphalt mixture and preparation method thereof

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preparation example Construction

[0042] Such as figure 1 As shown, the present invention also provides a kind of preparation method of high-volume RAP plant-mixed heat regeneration modified asphalt mixture, comprising:

[0043] S1, RAP crushing and screening

[0044] The same batch of recycled materials obtained by milling and planing is fully mixed by machinery, crushed to a particle size ≤ 30mm, and then sieved, and sieved into grades 2 to 5 reference materials with different particle sizes;

[0045] S2, RAP separate warehouse stacking

[0046] The reference materials obtained in step S1 are evenly stacked on the hardened and well-drained site to avoid mixing of different types of reference materials. The stacking height is ≤ 4m to avoid heavy pressure and agglomeration of materials. Rainy areas are covered with rainproof sheds;

[0047] S3. Raw material testing

[0048] Selected aggregates, mineral powder, RAP, asphalt, asphalt regenerant, recycled SBS modified asphalt mixture modifier, randomly sampled...

Embodiment 1

[0060] The high-volume RAP plant-mixed heat-regenerated modified asphalt mixture of the present invention is used in the medium surface layer recycled SBS modified asphalt mixture AC-20C, replacing the conventional road surface medium surface layer AC-20C hot-mixed SBS modified asphalt concrete, ensuring While improving the performance of concrete roads, it can fully utilize recycled asphalt pavement materials, reduce the amount of new aggregates, reduce the proportion of external admixtures, and achieve the effects of energy saving and emission reduction. In this example, the high-volume RAP plant-mixed heat-recycled modified asphalt mixture is formed according to the following steps:

[0061] (1) RAP crushing and screening

[0062] The mixing station fully mixes the surface layer recycled materials of a municipal road obtained by milling and planing, and then crushes them to a particle size of ≤30mm, and sieves them into 1# of 16mm~30mm and 0~16mm with a 16mm sieve hole RAP...

Embodiment 2

[0114] In this example, the high-volume RAP plant-mixed hot-recycled modified asphalt mixture is used for the mid-surface layer recycled SBS modified asphalt mixture AC-20C, which is formed according to the following steps:

[0115] (1) RAP crushing and screening

[0116] The mixing station fully mixes the recycled surface layer of an expressway obtained by milling and planing, and then crushes it to a particle size of ≤30mm, and sieves it into 1# of 15mm~30mm and 0~15mm with a 15mm sieve hole. RAP and 2#RAP.

[0117] (2) RAP is stacked in separate warehouses

[0118] The 1#RAP and 2#RAP obtained in step (1) were evenly stacked in two hardened and well-drained silos, with a stacking height of 3m.

[0119] (3) Raw material testing

[0120] The selected aggregates and mineral powders are randomly sampled to test the quality, and each index must meet the requirements of the "Technical Specifications for Highway Asphalt Pavement Recycling" (JTG / T 5521-2019) and the Technical Sp...

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Abstract

The invention provides a high-doping-amount RAP hot mix plant recycled modified asphalt mixture. The high-doping-amount RAP hot mix plant recycled modified asphalt mixture is prepared from, by mass, 40%-70% of RAP, 23.4%-58.3% of new aggregate, 0%-3% of mineral powder, 1.5%-6% of new asphalt, an asphalt recycling agent accounting for 3%-5% of the mass of old asphalt in the RAP and 0.01%-0.3% of a recycled SBS modified asphalt mixture modifier. The preparation method comprises the following steps: RAP crushing and screening, raw material detection, mineral aggregate gradation design, determination of the amount of asphalt and the amount of the asphalt recycling agent, performance verification of a regenerated mixture, determination of the amount of the modifier, and material blending. By improving the dual performance of the aged asphalt and the recycled modified asphalt mixture, the utilization value and the utilization rate of the RAP are improved, the performance of the recycled modified asphalt mixture is improved, the preheating temperature of the RAP is reduced, and efficient regeneration and utilization of the modified asphalt mixture with high RAP doping amount are realized.

Description

technical field [0001] The invention relates to the field of road surface materials, in particular to a high-volume RAP factory-mixed heat-recycled modified asphalt mixture and a preparation method thereof. Background technique [0002] As of the end of 2020, the total mileage of national highways is 5.1981 million kilometers, and the mileage of highway maintenance is 5.144 million kilometers, accounting for 99.0% of the total mileage of highways. The highway has entered the period of maintenance and maintenance from the period of large-scale construction. Asphalt concrete is mostly used for road surface in our country, and SBS modified asphalt concrete is used for high-grade highways. With the development of maintenance projects, tens of thousands of tons of waste asphalt pavement materials (RAP) are produced. If these old materials are not processed Effective recycling will cause waste of natural resources and pollution of the ecological environment. [0003] In order to ...

Claims

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Application Information

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IPC IPC(8): C04B26/26C04B18/16
CPCC04B26/26C04B18/16C04B2201/20C04B2201/50C04B2111/00017C04B2111/0075C04B14/28C04B14/04C04B14/02Y02W30/91
Inventor 陈宇亮彭孝南黄毅吴开孙剑峰刘至飞李婷玉曾辉张迅郑祖恩谢峰任毅杨震
Owner 湖南省交通科学研究院有限公司
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