期刊论文

Effect of Wetting-Drying Cycles on Mass and Deformation of Cement and Emulsified Asphalt Mortar

中文

西南交通大学学报

0258-2724

2019

54

4

786-792

10.3969/j.issn.0258-2724.20180261

国家自然科学基金资助项目（50978257）； 国家重点基础研究发展计划（973计划）课题（2013CB036201）；

本校为其他机构

CA砂浆(cement and emulsified asphalt mortar)服役环境湿度因气候、天气因素的影响产生显著变化,会引起其质量和体积的变化,进而对轨道结构的几何尺寸产生影响.为了解服役环境中湿度变化对CA砂浆质量、尺寸的影响,设计了6种干湿循环制度,测试了不同干湿循环制度下CA砂浆质量、长度变化;并采用低场核磁共振(NMR)及综合热分析(TG-DSC)对其孔结构和物相组成进行了分析,以揭示其变化机理.研究结果表明:随着循环次数的增加,CA砂浆湿质量迅速增加并达到最大值,随后下降,并在140 d左右趋于稳定,干质量的变化很小;而其长度随循环次数的增加先减小后增加.干湿循环中,CA砂浆质量与长度的变化均小于持续干...

The varying humidity of service environment due to the change of weather and climate has a significant influence on the mass and volume of CA (cement and emulsified asphalt) mortar,which further influences the geometrical size of track structure.To understand the effect of the variation of ambient humidity on the mass and size of CA mortar in service,6 kinds of wetting-drying cycles were designed in which the mass and length changes of CA mortar were measured.To investigate the mechanism of length change,pore structure and phase composition were examined by low field nuclear magnetic resonance...