长江科学院院报 ›› 2019, Vol. 36 ›› Issue (4): 135-139.DOI: 10.11988/ckyyb.20180910

• 第28届全国土工测试学术研讨会专栏 • 上一篇    下一篇

纳米MgO改性滨海水泥土的直剪试验及微观机理

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   

  1. 1.绍兴文理学院 土木工程学院,浙江 绍兴 312000;
    2. 新加坡国立大学 土木与环境工程系,新加坡 肯特岗 117576;
    3.河海大学 岩土力学与堤坝工程教育部重点实验室,南京 210098
  • 收稿日期:2018-08-22 修回日期:2018-10-05 出版日期:2019-04-01 发布日期:2019-04-18
  • 通讯作者: 王伟(1977-),男,安徽太和人,教授,博士,研究方向为岩土工程。E-mail:wellswang@usx.edu.cn
  • 作者简介:张陈(1993-),男,安徽合肥人,助理工程师,硕士,研究方向为岩土工程。E-mail:golenchen@outlook.com
  • 基金资助:
    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)

Mechanical and Micro-structural Characteristics of Coastal Cement Soil Modified by Nano-MgO

ZHANG Chen1, LI Na1, WANG Wei1,2, YUAN Jun-ping3, JIANG Ping1, WU Wang-yi1, FU Ke-xian1   

  1. 1.School of Civil Engineering, Shaoxing University, Shaoxing 312000, China;
    2.Department of Civil ＆ Environment Engineering, National University of Singapore, Kent Ridge 117576, Singapore;
    3.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
  • Received:2018-08-22 Revised:2018-10-05 Published:2019-04-01 Online:2019-04-18

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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。

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

Abstract: 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.

Key words: coastal cement soil, nano-MgO, shear strength, SEM, micro-structure, mix ratio

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