文献类型：期刊文献

中文题名：纳米MgO改性滨海水泥土的直剪试验及微观机理

英文题名：Mechanical and Micro-structural Characteristics of Coastal Cement Soil Modified by Nano-MgO

作者：张陈[1];李娜[1];王伟[1,2];袁俊平[3];姜屏[1];吴王意[1];傅克贤[1]

机构：[1]绍兴文理学院土木工程学院;[2]新加坡国立大学土木与环境工程系;[3]河海大学岩土力学与堤坝工程教育部重点实验室

年份：2019

卷号：36

期号：4

起止页码：135

中文期刊名：长江科学院院报

外文期刊名：Journal of Yangtze River Scientific Research Institute

收录：CSTPCD、、北大核心2017、Scopus、CSCD2019_2020、北大核心、CSCD

基金：国家自然科学基金项目(41772311);浙江省自然科学基金项目(LY17E080016);浙江省建设科研项目(2017K179;2016K130)

语种：中文

中文关键词：滨海水泥土;纳米MgO;抗剪强度;扫描电镜;微观结构;掺入比

外文关键词：coastal cement soil;nano-MgO;shear strength;SEM;micro-structure;mix ratio

中文摘要：为研究纳米MgO对滨海水泥土的改性效果,对纳米MgO改性水泥土(简称NmCS)进行了力学试验和微观测试。通过室内直接剪切试验,研究了纳米MgO的掺入比对水泥土力学特性的影响规律;利用扫描电镜的微观测试方法,观察不同纳米MgO掺入比的NmCS试样的微观结构,分析了纳米MgO改善水泥土强度的机理。结果表明:①纳米MgO改性水泥土强度存在最优掺入比,本次试验对应最优掺入比为10‰;②未掺入纳米MgO的滨海水泥土以小颗粒-松散结构为主,纳米MgO掺入比为10‰的NmCS微观结构最为致密,宏观表现为力学强度的提高。研究结果对现场使用纳米MgO改性水泥土的最优掺量提供试验参考。

外文摘要：To investigate the effect of nano-MgO on cement-treated seashore soil,mechanical test and microscopic test were conducted on nano-MgO modified cement-treated seashore soil (NmCS). The mechanical performances of NmCS samples with varied cement content and nano-MgO content were examined via indoor direct shear test. Furthermore,the micro-structural characteristics and mechanism were studied by using SEM technology. Test result unveiled that:(1) there exists an optimum content of nano-MgO for NmCS. Specifically in the test of the present research,the optimum content of nano-MgO is 10‰.(2) Cement-treated seashore soil in the absence of nano-MgO is dominated by loose-structure and small particles;while NmCS with 10‰ nano-MgO is the most compact,reflected as in the improvement of mechanical strength.