Feasibility Study on Using Recycled Construction Waste Aggregate in Urban Sponge Water Storage Structure
Xue-tong MA1#+, De-bin GAO1, Tonglu LI2
1School of Geological Engineering and Surveying, Chang'an University, China, 2Chang'an University, China

To improve the utilization rate of recycled aggregate and provide safe and reliable building raw materials for water storage structure of sponge City. The particle breakage and settlement deformation of recycled aggregate of construction waste with different proportions under different moisture content and load after long-term drying and wetting cycles were studied through large-scale consolidation test. The results show that the compression settlement of construction waste recycled aggregate is affected by load, moisture content and drying and wetting cycles, and the proportion of aggregate also has a certain influence on the settlement. With the increase of load and the times of drying and wetting cycles, the compression settlement of recycled aggregate increases. With the increase of the proportion of brick aggregate, the compression settlement increases. When the moisture content is the optimal moisture content, the compression settlement is the largest. It can be considered that the settlement of aggregate is mainly caused by particle breakage, and other factors affect the compression settlement by affecting particle breakage. Particle breakage is the fundamental reason for the settlement of recycled aggregate. Based on the experimental results, the empirical formula of aggregate ratio, moisture content, load and settlement under the action of drying and wetting cycles is established. According to the characteristics of water storage structure in sponge City, the appropriate construction scheme is put forward. Considering that the actual application load of water storage structure is small, the post construction monitoring program is converted to pre construction prediction. In terms of construction feasibility, recycled aggregate is a reliable raw material for the filling of sponge city water storage structures.