东南大学学报（自然科学版）2016，Vol.46Issue(z1)：57-62,6.DOI:10.3969/j.issn.1001-0505.2016.S1.011
土壤有机质对铅污染土固稳特性的影响规律及微观机理
Effects of organic matter on engineering characteristics and microstructures of lead contaminated soil S/S treated by cement
摘要
Abstract
Unconfined compressive strength, permeability, leaching, and microstructure tests were conducted to investigate the engineering characteristics and micro-mechanisms of stabilized/solidified (S/S) lead-contaminated soils with different organic matter contents (0%, 0. 5%, 1%, 2%, and 5%) . Results show that the permeability and leaching pH of samples increase with organic matter contents, but the strength and the leaching concentration decrease. Scanning electron microscope ( SEM) and mercury intrusion porosity ( MIP) tests are conducted to study the micro-mechanisms of the variation of aforementioned properties. Results identify that the organic matter decreases by the quantity and the morphology of cement hydration products by depressing the cement hydration reac-tion. The quantity of sample pores increases with organic matter contents, the chemical species of heavy metals changed by complexation with organic matter is the reason why the leaching concentra-tion decreases.关键词
铅污染土/固化/稳定化/有机质/微观机制Key words
solidification/stabilization(S/S)/lead contaminated soil/organic matter/micro-mechanism分类
交通工程引用本文复制引用
李江山,张亭亭,王平,黄茜,薛强..土壤有机质对铅污染土固稳特性的影响规律及微观机理[J].东南大学学报（自然科学版）,2016,46(z1):57-62,6.基金项目
国家自然科学基金资助项目(41602315,51479194)、岩土力学与工程国家重点实验室开放基金课题资助项目(Z015003)、中国科学院科技创新“交叉与合作团队”资助项目(Y426011C01) （41602315,51479194）
