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

页码：555 / 566

页数：12

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