Effects of nanomaterials on hardening of cement-silica fume-fly ash-based ultra-high-strength concrete

被引：38
作者：
Wang, Dehui [1 ]
Shi, Caijun [1 ]
Wu, Zemei [1 ,2 ]
Wu, Linmei [1 ]
Xiang, Shuncheng [1 ]
Pan, Xiaoying [1 ]
机构：
[1] Hunan Univ, Coll Civil Engn, Changsha, Hunan, Peoples R China
[2] Missouri Univ Sci & Technol, Dept Civil Architectural & Environm Engn, Rolla, MO USA
来源：
ADVANCES IN CEMENT RESEARCH | 2016年 / 28卷 / 09期
基金：
美国国家科学基金会;
关键词：
hydration; microstructure; SELF-CONSOLIDATING CONCRETE; NANO-PARTICLES; MECHANICAL-PROPERTIES; MICROSTRUCTURE; PERFORMANCE; NANO-SIO2; NANOSILICA; REDUCTION; MORTAR;
D O I：
10.1680/jadcr.15.00080
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In this paper, the flowability, compressive strength, hydration heat, porosity and calcium hydroxide content of cement-silica fume-fly ash-based ultra-high-strength concrete (UHSC) incorporating either nano-silica (SiO2) or nano-calcium carbonate (CaCO3) were investigated. Test results showed that the flowability of UHSC was reduced by incorporating nano-silica and nano-calcium carbonate. After incorporating nano-silica, the hydration heat flow of UHSC increased, and the hydration heat of UHSC increased at first but decreased later. For UHSC with nano-calcium carbonate, the hydration heat flow increased and the hydration heat decreased. With the increase of both nano-silica and nano-calcium carbonate content, the compressive strength of UHSC increased at first and then decreased. The porosity decreased at first and increased later with the increase of nano-silica and nano-calcium carbonate content. As regards the calcium hydroxide content, this decreased with the increase of nano-silica content, but increased with the increase of nano-calcium carbonate content.
引用
收藏
页码：555 / 566
页数：12
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