In order to explore the applicability of construction waste recycling materials for urban road subgrade filler in rainy areas,the material composition of recycled materials was determined by manual initial sorting and screening tests.The influence of moisture on the strength characteristics of bricks was studied by point load test,and the gradation of subgrade filler was designed according to the basic characteristics of raw materials.The water content and deformation characteristics of subgrade during immersion-dehydration cycle were studied by self-designed large indoor soil column test,and the changes of resilient modulus and gradation of recycled materials before and after the test were analyzed.The results show that the raw materials of construction waste are mainly waste bricks,concrete blocks and stones,and the natural gradation is poor.After mixing 0-10 mm and 10-20 mm recycled fillers in a ratio of 3∶1,the gradation is good.The final deformation of subgrade model after multiple immersion-dehydration cycles is 0.62％of the filling height.The attenuation value of resilient modulus after multiple cycles is 28.4％,but it still meets the filling requirements.Under the combined action of load and moisture,the secondary crushing of particles larger than 5 mm is obvious,while the particles smaller than 0.3 mm are relatively stable,and the filler gradation after crushing still meets the requirements.The construction waste maintains good strength and water stability after repeated soaking and dehydration cycles,which can be used for subgrade filling.
关键词
建筑垃圾再生材料/路基填料/长期变形特性/颗粒破碎机制
Key words
recycled material for construction waste/subgrade filler/long-term deformation char-acteristic/particle breakage mechanism
维普
万方数据