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Abstract

To study the effect of the asphalt grade on the basic properties of waste concrete coarse aggregate (RCA) hot recycled asphalt mixtures, this paper first prepared the RCA hot recycled asphalt mixture (Type A and Type B) with coarse aggregate, ordinary aggregate, and different grades of asphalt (60/70 asphalt or 80/100 asphalt) in a certain proportion, and then conducted volume characteristic tests and basic property tests on different mixture samples. The experimental results show that the optimal asphalt mixing content, asphalt filling void ratio (VVFB), rutting resistance, and water damage resistance of Type B mixture (80/100) are higher or better than those of Type A mixture (60/70), while the relative density, Marshall stability, modulus of resilience, and skid resistance properties are lower or worse than those of Type A mixture. Meanwhile, the addition of RCA will increase or enlarge the optimal asphalt mixing content and porosity of the mixture, while reducing the proportion, asphalt filling porosity, mineral aggregate porosity, Marshall stability, and modulus of resilience of the mixture. Compared with ordinary mixtures (without RCA), RCA hot recycled mixtures have poor resistance to rutting and water damage, but better skid resistance. For Type A and Type B mixtures, it is recommended that the maximum RCA mixing content that meets heavy traffic requirements should be 25%. When the RCA content in the hot recycled mixture is higher than 25%, it can be applied to road surfaces with lower performance requirements, such as roads with low to medium traffic volume.

Publication Date

11-8-2022

DOI

10.14048/j.issn.1671-2579.2022.05.038

First Page

208

Last Page

215

Submission Date

April 2025

Reference

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