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Design method of hot recycled asphalt mixture with high RAP proportion

A technology of asphalt mixture and design method, which is applied to cohesive pavement paved on site, roads, roads, etc., can solve the problems of unsatisfactory performance of recycled asphalt mixture, achieve material cost reduction, and have obvious economic and environmental advantages. The effect of increasing the blending ratio

Active Publication Date: 2014-11-26
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, affected by the variability of RAP materials (including asphalt content in RAP, aging degree of RAP, RAP gradation, RAP water content, and fine material (particle size <0.075mm) content in RAP), the blending rate of RAP in my country is generally 10-25%, if the RAP blending ratio is too high, the performance of the recycled asphalt mixture produced cannot meet the requirements of the current specifications in my country

Method used

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  • Design method of hot recycled asphalt mixture with high RAP proportion
  • Design method of hot recycled asphalt mixture with high RAP proportion
  • Design method of hot recycled asphalt mixture with high RAP proportion

Examples

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Embodiment 1

[0055] A Design Method of Hot Recycled Asphalt Mixture with High RAP Ratio

[0056] This embodiment takes the design of AC-13C asphalt mixture as an example, the details are as follows:

[0057] 1. RAP broken into files

[0058] The RAP after road milling is crushed and screened, classified according to the particle size, and the RAP with a particle size smaller than 2.36mm is removed, and finally three grades of 3-5mm, 5-10mm, and 10-15mm are obtained. The RAP material is kept in a dry state during the crushing and screening, and the water content in the RAP material is controlled to be 2% by mass of the RAP material. The crushing and sieving is to reduce the variability of the RAP material.

[0059] 2. RAP extraction

[0060] The graded RAP is extracted with a fully automatic extractor, and the gradation after extraction of each grade of RAP and the content of aged asphalt in each grade of RAP are tested. According to the T0726-2011 method of recovering asphalt from asph...

Embodiment 2

[0095] A design method for hot recycled asphalt mixture with high RAP ratio, taking the design of AC-13C recycled asphalt mixture as an example, including controlling the variability of RAP materials, improving the regeneration effect of regenerant and determining the appropriate test conditions.

[0096] In this embodiment, the control of the variability of the RAP material includes the step of crushing and screening the RAP material after the original pavement is crushed, the RAP material is kept dry during the crushing and screening, and the moisture content in the RAP material is controlled to account for the RAP material. The mass percentage of the material is 2%. The crushing and sieving is to reduce the variability of the RAP material.

[0097]In this embodiment, after the RAP material is crushed and screened, it is classified according to the size of the particle size; -10mm, 10-15mm, the three grades of RAP materials are stored separately. to prevent mixing with eac...

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Abstract

The invention belongs to the technical field of road engineering, and particularly relates to a design method of a hot recycled asphalt mixture with a high RAP proportion. The method comprises the steps of controlling the variability of an RAP material, improving the recycling effect of a recycling agent and determining appropriate test conditions. The design method can effectively increase the blending rate of the RAP, the performance of the recycled asphalt mixture meets the relevant provisions, and the blending ratio of the RAP can reach 36%. According to the design method provided by the invention, the RAP material is well utilized, resources are saved, the waste of materials is avoided, the material cost of highway construction can be effectively reduced, and the damage of resource mining to the environment also can be reduced simultaneously. The economic and environmental advantages of a technology are very obvious.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a design method of a heat-recycled asphalt mixture with a high RAP ratio. Background technique [0002] Hot-mix recycled asphalt pavement is to transport RAP back to the mixing plant after milling and planing, and then crush it in a centralized way. According to the quality requirements of different layers of the road surface, the ratio design is carried out to determine the addition ratio of RAP, regeneration agent, new asphalt materials, and new aggregates. etc., re-mixed into a new mixture according to a certain proportion, so as to obtain an excellent recycled asphalt mixture, and pave it into a recycled asphalt pavement. [0003] In recent years, my country's transportation infrastructure has shifted from construction-based to both construction and maintenance. Every year, the RAP generated by road maintenance exceeds 10 million tons. These RAPs accumula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C7/22
Inventor 季节索智高超徐世法周志民祝大典
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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