文献类型：期刊文献

英文题名：Strength properties of nano-MgO and cement stabilized coastal silty clay subjected to sulfuric acid attack

作者：Wang, Wei[1];Li, Yuan[1];Yao, Kai[2];Li, Na[1];Zhou, Aizhao[3];Zhang, Chen[1]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing, Zhejiang, Peoples R China;[2]Natl Univ Singapore, Dept Civil & Environm Engn, 1 Engn Dr 2, Singapore 117576, Singapore;[3]Jiangsu Univ Sci & Technol, Dept Civil & Architecture Engn, Zhenjiang, Jiangsu, Peoples R China

年份：2020

卷号：38

期号：10

起止页码：1177

外文期刊名：MARINE GEORESOURCES & GEOTECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000483137000001)、、EI(收录号：20193407350058)、Scopus(收录号：2-s2.0-85070993857)、WOS

基金：This work is supported by the National Natural Science Foundation of China (41772311), Zhejiang Provincial Natural Science Foundation of China (LY17E080016), and Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science (Z017013).

语种：英文

外文关键词：Nano-MgO; cement; silty clay; sulfuric acid attack; direct shear test

外文摘要：The characteristics of nanometer magnesium oxide (nano-MgO) admixed cement in the treatment of clay were studied in direct shear tests. The chemical resistance of the admixed clay cement was investigated by soaking specimens in sulfuric acid solution. Various contents of nano-MgO (from 5 parts per thousand to 20 parts per thousand) were mixed with ordinary Portland cement (OPC) and its effect on the shear strength of cemented silty clay was studied. The test results showed that the optimal nano-MgO content to achieve highest shear strength was 5 parts per thousand. It was observed also that the cohesion was most mobilized at the optimal nano-MgO content. Visual observation of the soak-tested samples revealed that damage to the surface of the specimens became more severe at higher sulfuric acid concentrations. In general, the shear strength of the mixture decreased with an increase in sulfuric acid concentration. Moreover, with an increase in sulfuric acid concentration (0.03 to 0.06 mol/L), both the cohesion and the friction angle decreased. However, the shear strength of the mixture increased with an increase in the soaking period, even in the sulfuric acid environment. Within the first 14 days of the soaking period, the shear strength of the mixture showed a clear change. However, for longer soaking periods (i.e., similar to 21 days), the strength did not change a great deal more.