Zhu Xuan, Ding Le, Wu Yuexing, Wang Xinzhong, Tan Xianliang
School of Civil Engineering, Hunan City University, Yiyang 413000, China.
National Engineering Research Center for Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, China.
Materials (Basel). 2024 May 29;17(11):2616. doi: 10.3390/ma17112616.
In road engineering, road construction requires a large amount of natural aggregate; its substitution with recycled construction-solid-waste aggregate not only saves resources but also reduces the burden on the environment. The main components of construction solid waste are concrete blocks and brick slag; the breakability of the latter can affect the performance of mixed recycled aggregate, which hinders the use of construction solid waste in road engineering applications. To analyze the applicability of recycled construction-solid-waste aggregate containing brick slag aggregate in the subgrade layer, the effect of brick aggregate content on the CBR (California bearing ratio) and crushing value of mixed recycled aggregates was evaluated based on laboratory tests, and the field compaction quality of the recycled aggregates was analyzed. The results show that the 9.5-19 mm mixed recycled aggregate samples were crushed to a higher degree during the compaction process. A brick aggregate content less than 40% had little effect on the performance of mixed recycled construction-solid-waste aggregate. It is recommended to use a 22 t road roller for five passes (two weak vibrations + two strong vibrations + one weak vibration) at a speed of 3 km/h in the main compaction stage of the subgrade filling.
在道路工程中，道路建设需要大量天然集料；用再生建筑固体废弃物集料替代天然集料不仅能节约资源，还能减轻环境负担。建筑固体废弃物的主要成分是混凝土块和砖渣；砖渣的易碎性会影响混合再生集料的性能，这阻碍了建筑固体废弃物在道路工程中的应用。为分析含砖渣集料的再生建筑固体废弃物集料在路基层中的适用性，基于室内试验评估了砖集料含量对混合再生集料加州承载比（CBR）和压碎值的影响，并分析了再生集料的现场压实质量。结果表明，9.5 - 19毫米的混合再生集料样品在压实过程中被压碎的程度更高。砖集料含量小于40%时，对混合再生建筑固体废弃物集料的性能影响较小。建议在路基填筑的主压实阶段，采用22吨压路机，以3公里/小时的速度碾压5遍（两遍弱振 + 两遍强振 + 一遍弱振）。
