Microhardness characteristics of high-strength cement paste and interfacial transition zone at different curing regimes

被引：96

作者：

Wang, Meng ^{[1
]}

Xie, Youjun ^{[1
]}

Long, Guangcheng ^{[1
]}

Ma, Cong ^{[1
]}

Zeng, Xiaohui ^{[1
]}

机构：

[1] Cent S Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 221卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Cement composites; Interfacial transition zone; Microhardness; Curing temperature; Mathematical statistical analysis; STATISTICAL-ANALYSIS; MECHANICAL CHARACTERISTICS; ACCELERATED CARBONATION; COMPRESSIVE STRENGTH; VOLCANIC ASH; CONCRETE; MICROSTRUCTURE; PERFORMANCE; TEMPERATURE; SILICA;

D O I：

10.1016/j.conbuildmat.2019.06.084

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

In order to understand the influencing mechanisms of curing temperature on the performances of steam cured concrete further, the microhardness characteristics of the interfacial transition zone between cement paste and coarse aggregate under different curing temperatures were studied through microhardness measurements, backscattered electronic microscopy (BSEM) and mathematical statistical analysis. The experimental results indicate that the microhardness of the hardened cement paste presents a significant statistical distribution characteristic. That is to say, there are two microhardness characteristic values which reflect the hydrated products and unhydrated cement particles, respectively. The curing temperature has a significant effect on the microhardness of interfacial transition zone. In other words, the microhardness decreases, and the thickness range of interfacial transition zone increases with increasing the curing temperature. The relationship of the microhardness value of the interfacial transition zone to the distance from the aggregate surface conforms to the Peal function. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页码：151 / 162

页数：12

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