Investigation of structural properties associated with alkali-silica reaction by means of macro- and micro-structural analysis

被引:26
作者
Mo, Xiangyin [1 ]
Fournier, Benoit
机构
[1] Nanjing Normal Univ, Anal & Testing Ctr, Nanjing 210097, Jiangsu, Peoples R China
[2] Nanjing Normal Univ, Mat Sci Key Lab, Nanjing 210097, Jiangsu, Peoples R China
[3] Canada Ctr Mineral & Energy Technol, Nat Resources Canada, Mat Technol Lab, Ottawa, ON K1A 0G1, Canada
关键词
alkali-silica reaction; amelioration; perlite; silica aggregate; lithium compounds;
D O I
10.1016/j.matchar.2006.04.018
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Structural properties associated with alkali-silica reaction were systematically investigated by means of macro-structural accelerated mortar prism expansion levels testing, combined with micro-structural analysis. One pail of this study is to determine the reactivity of the aggregate by means of accelerated mortar bar tests, and also to evaluate perlite aggregate constituents, especially the presence of deleterious components and find main causes of the alkali-silica reaction, which was based on the petrographic studies by optical microscope and the implication of X-ray diffraction on the aggregate. Results implied that the aggregate was highly alkali-silica reactive and the main micro-crystal line quartz-intermediate character and matrix that is mainly composed of chalcedony are potentially suitable for alkali-silica reaction. The other part is to study the long-term effect of lithium salts against alkali-silica reaction by testing accelerated mortar prism expansion levels. The macro-structural results were also consistent with the micro-structural mechanisms of alkali-silica reaction of mortar prisms containing this aggregate and the effect of chemical admixtures by means of the methods of scanning electron microscope-X-ray energy-dispersive spectroscopy and Xray diffraction. It was indicated by these techniques that lithium salts, which were introduced into concrete containing reactive aggregate at the mixing stage, suppressed the alkali-silica reaction by producing non-expansive crystalline materials. (c) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码:179 / 189
页数:11
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