工业固废改性高液限黏土路用性能研究

Study on Road Performance of Modified High Liquid Limit Clay by Industrial Solid Waste

本文采用大宗工业固废材料脱硫石膏、粉煤灰和固硫灰渣作为原材料,研发了一种SC-1高液限黏土改性剂。基于XRD衍射试验,获得了黄泛区高液限黏土、脱硫石膏、固硫灰渣和粉煤灰的化学成分组成,并提出了工业固废基SC-1改性剂的改性机理,初步验证了SC-1改性剂针对黄泛区高液限黏土的降水效果。基于界限含水率试验,确定了SC-1改性剂的最优掺量为6%,液限和塑性指数分别降低4.06%和6.74%。改性后高液限黏土的CBR值和回弹模量值均有较大提高,可满足重型、特重型交通对路基土的要求。改性后的黄泛区高液限黏土可用于路基填筑,既利用了大宗工业固废,又实现了弃土有效利用,取得了良好的经济效益、社会效益和显著的环保效益。

Stabilizer of high liquid clay named SC-1 was developed in this paper. The stabilizer is made by bulk industrial solid waste materials such as desulfurization gypsum, fly ash and fluidized bed combustion fly ash as raw materials. Based on XRD diffraction test, the chemical compositions of high-liquid limit clay, desulfurized gypsum, fluidized bed combustion fly ash and fly ash in Yellow River floodplain were obtained, and the modification mechanism of SC-1 stabilizer was proposed. The effect of SC-1 stabilizer on high-liquid limit clay in Yellow River floodplain was preliminarily compared and verified. Based on the limit moisture content test, the optimal ratio of SC-1 stabilizer was determined to be 6%, which could reduce the liquid limit and plasticity index by 4.06% and 6.74%. CBR value and resilient modulus of modified clay were both greatly improved, which could satisfy the requirements of subgrade soil for heavy and especially heavy traffic. SC-1 modified high liquid limit clay in the Yellow River floodplain could be used for roadbed filling with significant economic, social and environmental benefits, not only reusing the bulk industrial solid waste, but also realizing the effective utilization of abandoned soil.