Research on Strength and Microstructure Characteristics of Cement Solidified Cadmium Contaminated Expansive Soil

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Zhang, Yuguo^1 ; Han, Shuai^1 ; Zheng, Yanlin^1 ; Wan, Dongyang^1 ; Duan, Mengmeng^1 ; Yang, Hanyue^1

Institute of Civil Engineering, Zhongyuan University of Technology, Zhengzhou, Henan

451191, China^1

关键词: Cadmium nitrate;    Expansive soils;    Heavy metal concentration;    Laboratory test;    Low concentrations;    Microstructure characteristics;    Strength increase;    Unconfined compressive strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/2/022025/pdf
DOI  :  10.1088/1755-1315/237/2/022025

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Depending on the laboratory test of consolidation expansive soil polluted by heavy metal Cd, we can use cement to cure expansive soil artificially polluted by cadmium nitrate in different concentration. The paper discussed how the heavy metal concentration, cement dosage and curing age influence the unconfined compressive strength by solidified expansive soil polluted by heavy metal and micro-structure properties were tested. The study results show that, as the curing age and cement concentration increases, the unconfined compressive strength increases; as the concentration of heavy metal increases, the unconfined compressive strength decreases; the effect of heavy metal concentration on strength is different, the effect of high concentration on strength is greater than the effect of low concentration; Through the change rules of the micro-structure characteristics, the results on micro-structure analyzing show that the reason of strength increases is the porosity decreases after adding cement.