含磷材料固化锌、铅污染土的路用性能试验研究

发布时间：2018-11-22 08:51

【摘要】：采用新型含磷材料(KMP)及水泥(PC)分别对锌、铅污染土进行固化处理。通过无侧限抗压强度、水稳性、回弹模量和压汞试验,探究固化污染土作为路基填料的力学及耐久特性。结果表明:常规养护条件下,KMP和PC固化污染土强度随龄期和掺量增长而提高,强度越大;锌、铅复合污染条件下,固化污染土强度最低。经过泡水试验,固化试样强度均有所下降且7d强度损失较高;铅、锌复合污染条件下,强度降低幅度最高,水稳系数为0.52~0.58。固化污染土回弹模量低于固化未污染土但高于未固化污染土回弹模量,且KMP试样回弹模量高于水泥试样回弹模量的6.7%~24.2%。相对PC固化污染土,KMP试样微孔隙多、中、大孔隙较少,结构致密。
[Abstract]:Zinc and lead contaminated soils were cured by new phosphorous material (KMP) and cement (PC) respectively. Based on the tests of unconfined compressive strength, water stability, elastic modulus and mercury injection, the mechanical and durability characteristics of solidified contaminated soil as subgrade fillers were investigated. The results show that under conventional curing conditions, the strength of KMP and PC solidified contaminated soils increases with the increase of age and content, and the strength of cured contaminated soils increases with the increase of age and content, while the strength of solidified contaminated soils is the lowest under the condition of zinc and lead compound pollution. The strength of solidified samples decreased and the loss of strength was higher in 7 days after the test of foam water, and the decrease of strength was the highest under the condition of lead and zinc compound pollution, and the coefficient of water stability was 0.52 ~ 0.58. The elastic modulus of solidified contaminated soil is lower than that of solidified uncontaminated soil but higher than that of unsolidified contaminated soil, and the elastic modulus of KMP sample is higher than that of cement sample. Compared with PC solidified contaminated soil, KMP sample has more micropores, less macropores and denser structure.
【作者单位】：东南大学江苏省城市地下工程与环境安全重点实验室;江苏省电力设计院;
【基金】：国家自然科学基金重点项目(41330641)、国家自然科学基金(51278100,41472258) 863计划(2013AA06A206) 江苏省自然科学基金(BK 2012022)
【分类号】：U414

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