| 纳米MgO改性滨海水泥土的直剪试验及微观机理 |
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| 引用本文： | 张陈,李娜,王伟,袁俊平,姜屏,吴王意,傅克贤. 纳米MgO改性滨海水泥土的直剪试验及微观机理[J]. 长江科学院院报, 2019, 36(4): 135-139. DOI: 10.11988/ckyyb.20180910 |
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| 作者姓名： | 张陈 李娜 王伟 袁俊平 姜屏 吴王意 傅克贤 |
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| 作者单位： | 绍兴文理学院 土木工程学院,浙江 绍兴,312000;绍兴文理学院 土木工程学院,浙江 绍兴 312000;新加坡国立大学 土木与环境工程系,新加坡 肯特岗 117576;河海大学 岩土力学与堤坝工程教育部重点实验室,南京,210098 |
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| 基金项目： | 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) |
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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。
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| 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 |
| 收稿时间： | 2018-08-22 |
| 修稿时间： | 2018-10-05 |
Mechanical and Micro-structural Characteristics of Coastal Cement Soil Modified by Nano-MgO |
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| ZHANG Chen,LI Na,WANG Wei,YUAN Jun-ping,JIANG Ping,WU Wang-yi,FU Ke-xian. Mechanical and Micro-structural Characteristics of Coastal Cement Soil Modified by Nano-MgO[J]. Journal of Yangtze River Scientific Research Institute, 2019, 36(4): 135-139. DOI: 10.11988/ckyyb.20180910 |
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| Authors: | ZHANG Chen LI Na WANG Wei YUAN Jun-ping JIANG Ping WU Wang-yi FU Ke-xian |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | coastal cement soil nano-MgO shear strength SEM micro-structure mix ratio |
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