SHAN Long1, LI Hongbo1, 2, 3, CHENG Yinyin1, KANG Xinrui1, ZHUYiding1
(1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2. Ningxia Engineering Technology Research Center of Water-Saving Irrigation and Water Resources Regulation, Yinchuan 750021, China; 3. Engineering Research Center for Efficient Utilization of Modern Agricultural Water Resources in Arid Regions, Ministry of Education, Yinchuan 750021, China)
Abstract：In order to improve the lining defects of concrete channel in saline soil foundation in Ningxia, such as frost heave and corrosion, and to improve the utilization rate of local magnesium slag, the study on solidification of saline soil was carried out with cement-magnesium slag. Thirteen kinds of cement-magnesium slag with different mass fractions were designed to cure saline soil samples, and the shear strength and hydration mechanism of the samples were analyzed by XRD and SEM characterization methods. The results show that the cohesion and internal friction angle of cement-magnesium slag solidify saline soil increase with the increasing of compacting coefficient for samples at 7 and 28 d of age. The cohesion and internal friction angle of solidified saline soil increase with the increasing of cement content. The addition of magnesium slag has a great effect on the cohesion of the sample, but a small effect on the friction angle. The relationship model between cement and magnesium slag content and shear strength index of cured saline soil is established. Hydrated calcium silicate is the main source of hydration products and shear strength enhancement of cured saline soil. The solidified saline soil particles at the age of 28 d can fill the pores and the microstructure is more dense, thus the strength is higher. The shear strength of cement and magnesium slag solidified saline soil is improved significantly, and the mechanical effect of cement and magnesium slag solidified soil is better when the cement fraction is 3% and the magnesium slag fraction is 10%.
Keywords：cement-magnesium slag solidified saline soil; shear strength; hydration mechanism; microstructure
Get Citation：SHAN L, LI H B, CHENG Y Y, et al. Mechanical properties test of solidified saline soil with cement-magnesium slag[J]. China Powder Science and Technology, 2023, 29(5): 8-16.
DOI：10.13732/j.issn.1008-5548.2023.05.002
Received：2023-03-30,Revised：2023-05-28,Online：2023-08-04 12：52。
Funding Project：国家自然科学基金项目,编号: 52069025; 宁夏回族自治区自然科学基金项目,编号: 2021AAC03080;宁夏高等学校一流学科(水利工程学科)资助项目,编号:NXYLXK2021A03。
First Author：单龙(2000—),男,硕士研究生,研究方向为道路材料。E-mail: 12022131152@stu.nxu.edu.cn。
Corresponding Author：朱一丁(1967—),教授,博士,研究方向为土木工程新材料。E-mail: zyd-1011@163.com。
CLC No：TU448; TB4
Type Code：A
Serial No：1008-5548(2023)05-0008-09
