Test research on influence of admixture agent on engineering characteristics of red sandstone roadbed filling in Dongchang Expressway

3rd International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Liang, Bo^1,2 ; Dong, Tianxiong^1 ; Mei, Yingjun^1 ; Pan, Jinqiu^1

School of Civi Engineering, Chongqing Jiaotong University, Chongqing

400074, China^1

State Key Laboratory Breeding Base of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing

400074, China^2

关键词: Engineering characteristics;    Laboratory test;    Liquid limits;    Maximum dry density;    Physical and mechanical properties;    Plastic limit;    Research object;    Test research;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/61/1/012103/pdf
DOI  :  10.1088/1755-1315/61/1/012103

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

By taking the red sandstone along the Jiangxi Dongchang expressway as the research object, this article takes lime and cement as the admixture agent, and conducts a series of laboratory test investigations on plain soil and improved soil, to research on the influence of the addition proportion on the physical and mechanical properties of red sandstone. According to test results: compared with plain soil, the red sandstones with admixture agents of lime and cement have reduced liquid limit and plastic limit, with reduced plastic index. With the increase of the proportion of lime, the optimal moisture content of the lime-improved soil gradually increases, and the maximum dry density gradually decreases. With the increase of the proportion of cement, the maximum dry density of the cement-improved soil increases, and the optimal moisture content decreases. The CBR improvement effect of cement-improved soil is better than that of the lime-improved soil. The optimal addition proportion of CBR of both the lime-improved soil and the cement-improved soil is 7%. Compared with plain red sandstone, the improvement on compaction functions plays a more significant role on the improvement of the CBR of the improved soil.