Study on Application Performance of Waste Concrete Recycled Aggregate in Asphalt Pavement Layer
In order to explore the feasibility of using waste concrete recycled aggregate for asphalt pavement layer,the adhesive characteristics between waste concrete recycled aggregate and asphalt was analyzed firstly.On this basis,waste concrete recycled aggregates were used to replace some natural aggregates,and the mixture de-sign was carried out with AC-25C as the target gradation for the asphalt pavement surface.The effects of waste concrete recycled aggregate content on the high temperature stability when the amount of waste concrete recy-cled aggregate is less than 30%,low temperature cracking resistance and water stability of asphalt mixture were studied in this paper.The results show that the adhesion between recycled aggregate and asphalt is grade 4,which meets the requirements of technical specifications.Compared with the new asphalt mixture,the con-tent of waste concrete recycled aggregate has little influence on the high-temperature performance of asphalt mixture,but the low-temperature crack resistance and water stability decrease with the content of recycled ag-gregate increasing.When the content of recycled aggregate is less than 60%,the asphalt mixture of waste con-crete recycled aggregate has good technical performance and can be used in pavement Layer construction.
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