The Study on the Performance of Regeneration Aggregate Pavement Base Material Under Standard Grading Median

Abstract

 In recent decades, with social and economic development, many new buildings and buildings have been built, while many old buildings have been demolished. Therefore, the world should consider how to reuse construction waste. Reuse of construction waste as aggregate to new buildings or road construction is an effective way. The effect of median aggregate regeneration aggregate on the performance of pavement base material was studied in this paper. Recycled concrete aggregate was used to replace 25 %, 50 % and 75 % of natural aggregate by volume, respectively. While the recycled clay brick was used to replace 5 %, 10 %, 15 % and 30 % of natural aggregate by volume. In addition, recycled aggregate composed of recycled concrete and recycled clay bricks in different proportions was used to replace aggregate of road base materials. The maximum dry density, optimum moisture content, unconfined compressive strength and drying shrinkage of road base materials were studied. The results show that the optimum moisture content increases with the increase of recycled aggregate replacement, and the biggest dry density decreases with the increase of recycled aggregate replacement. Recycled aggregate can improve the 7 d unconfined compressive strength of pavement base material and reduce the dry shrinkage rate in a certain range of replacement rate. When the aggregate was 100 % recycled aggregate, with the increase of recycled clay brick content, the 7d unconfined compressive strength of the material decreases and the drying shrinkage would increase.