Characterisation of the interfacial transition zone in mortars by nanoinaentation and scanning electron microscope

被引：21
作者：
Gao, Yueyi [1 ,2 ,3 ]
Hu, Chuanlin [4 ]
Zhang, Yamei [1 ]
Li, Zongjin [5 ]
Pan, Jinlong [2 ]
机构：
[1] Southeast Univ, Jiangsu Key Lab Construct Mat, Nanjing, Jiangsu, Peoples R China
[2] Southeast Univ, Sch Civil Engn, Nanjing, Jiangsu, Peoples R China
[3] Jiangsu Acad Safety Sci & Technol, Nanjing, Jiangsu, Peoples R China
[4] Wuhan Univ Technol, State Key Lab Silicate Mat Architecture, Wuhan, Hubei, Peoples R China
[5] Hong Kong Univ Sci & Technol, Dept Civil & Environm Engn, Hong Kong, Peoples R China
来源：
MAGAZINE OF CONCRETE RESEARCH | 2018年 / 70卷 / 18期
关键词：
cement; cementitious materials; modulus of elasticity; mortar; RECYCLED AGGREGATE CONCRETE; NANO-MECHANICAL PROPERTIES; CEMENT-BASED MATERIALS; BACKSCATTERED ELECTRON; ELASTIC-MODULUS; IMAGE-ANALYSIS; ITZ; NANOINDENTATION; MODEL; INDENTATION;
D O I：
10.1680/jmacr.17.00161
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This paper aims to characterise the microstructure and the micro-mechanical properties of the interfacial transition zone (ITZ) in mortars at different water/cement ratios by nanoindentation and scanning electron microscope. Through this study, an insight is provided into the link between the microstructure and the micro-mechanical properties of the ITZ. The thickness of the ITZ was determined from the viewpoint of micro-mechanical properties, as well as from the viewpoint of porosity. The results showed that the average elastic modulus of calcium-silicate-hydrate gel present in the ITZ decreases with the increasing water/cement ratio. Meanwhile, the ratios between the average reduced moduli of the ITZ and the cement paste matrix were quantitatively determined, and the results showed that a lower water/cement ratio led to a thinner ITZ, and a higher ratio between the average reduced moduli of the ITZ and the cement paste matrix.
引用
收藏
页码：965 / 972
页数：8
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