Alkali Activity of Granite Aggregates and Control in the Concrete of the Three Gorges Project

On the basis of the existing standardized test methods of concrete aggregates alkali activity, the alkali activity of the granite aggregates is studied by extending the observation time. The results showed that the alkali reaction expansion ratio of the fresh granite broke through the 0.1% criterion...

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Veröffentlicht in:	Key engineering materials 2013-01, Vol.539, p.249-254
Hauptverfasser:	Wang, Zai Qin, Wen, Zi Yun, Liu, Chong Xi, Xiao, Liang, Li, Zhen
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Sprache:	eng
Schlagworte:	Aggregates Alkali-silica reactions Cements Concrete dams Concretes Dams (concrete) Granite Microstructure Test procedures
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creator	Wang, Zai Qin Wen, Zi Yun Liu, Chong Xi Xiao, Liang Li, Zhen
description	On the basis of the existing standardized test methods of concrete aggregates alkali activity, the alkali activity of the granite aggregates is studied by extending the observation time. The results showed that the alkali reaction expansion ratio of the fresh granite broke through the 0.1% criterion limit after a decade of time. The reactant microstructure characteristic is similar to the structure of the alkali-silica reaction, the thickness of reaction layer is about 2~4 µm. Controlling the total alkali content of the dam concrete and replacing cement by mixing a certain proportion of fly ash can effectively prevent the occurrence of the AAR in the Three Gorges Project.
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The results showed that the alkali reaction expansion ratio of the fresh granite broke through the 0.1% criterion limit after a decade of time. The reactant microstructure characteristic is similar to the structure of the alkali-silica reaction, the thickness of reaction layer is about 2~4 µm. Controlling the total alkali content of the dam concrete and replacing cement by mixing a certain proportion of fly ash can effectively prevent the occurrence of the AAR in the Three Gorges Project.</description><identifier>ISSN: 1013-9826</identifier><identifier>ISSN: 1662-9795</identifier><identifier>EISSN: 1662-9795</identifier><identifier>DOI: 10.4028/www.scientific.net/KEM.539.249</identifier><language>eng</language><publisher>Trans Tech Publications Ltd</publisher><subject>Aggregates ; Alkali-silica reactions ; Cements ; Concrete dams ; Concretes ; Dams (concrete) ; Granite ; Microstructure ; Test procedures</subject><ispartof>Key engineering materials, 2013-01, Vol.539, p.249-254</ispartof><rights>2013 Trans Tech Publications Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Uhttps://www.scientific.net/Image/TitleCover/2178?width=600</thumbnail><link.rule.ids>314,776,780,27903,27904</link.rule.ids></links><search><creatorcontrib>Wang, Zai Qin</creatorcontrib><creatorcontrib>Wen, Zi Yun</creatorcontrib><creatorcontrib>Liu, Chong Xi</creatorcontrib><creatorcontrib>Xiao, Liang</creatorcontrib><creatorcontrib>Li, Zhen</creatorcontrib><title>Alkali Activity of Granite Aggregates and Control in the Concrete of the Three Gorges Project</title><title>Key engineering materials</title><description>On the basis of the existing standardized test methods of concrete aggregates alkali activity, the alkali activity of the granite aggregates is studied by extending the observation time. 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subjects	Aggregates Alkali-silica reactions Cements Concrete dams Concretes Dams (concrete) Granite Microstructure Test procedures
title	Alkali Activity of Granite Aggregates and Control in the Concrete of the Three Gorges Project
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