文献类型：期刊文献

中文题名：冻融循环下纳米黏土改性滨海水泥土的微观结构

英文题名：Microstructure of Coastal Soil Modified with Cement and Nano-clay Soil under Freeze-thaw Cycles

作者：严浩然[1];王伟[1];王林霞[2];周浩[1];李娜[1]

机构：[1]绍兴文理学院土木工程学院,绍兴312000;[2]绍兴文理学院化学化工学院,绍兴312000

年份：2021

卷号：21

期号：11

起止页码：4562

中文期刊名：科学技术与工程

外文期刊名：Science Technology and Engineering

收录：CSTPCD、、北大核心、北大核心2020

基金：国家自然科学基金(41772311);岩土力学与工程国家重点实验室开放基金(Z017013)。

语种：中文

中文关键词：冻融循环;纳米黏土;微观结构;量化分析

外文关键词：freeze-thaw cycles;nano-clay;microstructure;quantitative analysis

中文摘要：为探究冻融循环下纳米黏土对滨海水泥土微观结构的改性效果,通过扫描电子显微镜微观测试对土体微观结构变化规律进行分析,探讨了土体的微观结构定量化参数与宏观力学特征的关联性。以纳米滨海水泥土为对象,利用扫描电子显微镜和Image Pro Plus软件获取土体在0、1、5、7、9、11次的冻融循环下的微观结构特征和量化参数。结果表明:①在未冻融的环境下,纳米黏土改善滨海水泥土微观结构效果明显,孔隙明显减小。②在冻融环境下,纳米黏土在冻融循环初期对滨海水泥土微观结构的改性效果好,表现在冻融循环0~5次内孔隙面积平均减少14.3%,而冻融循环7~11次时仅平均减少4.3%的孔隙面积。通过概率密度函数的分布可知纳米黏土抑制了滨海水泥土超大孔隙的发育。③纳米滨海水泥土的压缩系数对颗粒面积变化比较敏感,颗粒的数量、不均匀系数等微观结构参数对压缩系数的影响较小。

外文摘要：In order to understand the modification effect of nano-clay on the microstructure of coastal cement soil under freeze-thaw cycles,the change rule of soil microstructure was analyzed by scanning electron microscope micro test,and the correlation between the quantification of soil microstructure and macro-mechanical characteristics was discussed.The microstructure characteristics and quantitative parameters of coastal cement soil and nano coastal cement soil under freezing and thawing cycles of 0,1,5,7,9 and 11 were obtained by scanning electron microscope and Image Pro Plus software.Results show as follows.Under the condition of no freeze-thaw,the effect of nano-clay on improving the microstructure of coastal cement soil is obvious,and the porosity is obviously reduced.In freeze-thaw environment,the effect of nano-clay on the microstructure of coastal cement is good at the early stage of freeze-thaw cycle.In 0~5 cycles of freeze-thaw cycles,the pore area of nano coastal cement soil decrease by 14.3%on average.While in 7~11 cycles of freeze-thaw cycles,the pore area decrease by 4.3%on average.According to the distribution of the probability density function,the nano-clay inhibits the development of the super-macropores in coastal cement soil.The compressibility of nano-sized soil is sensitive to the change of particle area,and the number of particles and the coefficient of inhomogeneity have little effect on the compressibility.