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

机译：三峡工程混凝土中花岗岩集料的碱活性及其控制。

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摘要

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.
机译：在现有混凝土骨料碱活性标准测试方法的基础上，通过延长观测时间，研究了花岗岩骨料的碱活性。结果表明，经过十多年的试验，新鲜花岗岩的碱反应膨胀率突破了0.1％标准极限。反应物的微观结构特征类似于碱-硅反应的结构，反应层的厚度约为2〜4μm。通过控制一定比例的粉煤灰控制大坝混凝土的总碱含量并替代水泥，可以有效地防止三峡工程中AAR的发生。

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  • 来源
  • 会议地点 Shanghai(CN)
  • 作者

    Zaiqin Wang; Chongxi Liu; Ziyun Wen; Zhen Li; Liang Xiao;

  • 作者单位

    South China University of Technology, Guangzhou 510640, China,Changjiang River Scientific Research Institute, Wuhan 430010, China,Research Center on Water Engineering Safety and Disaster Prevention of the Ministry of Water Resources, Wuhan 430010, China;

    Changjiang River Scientific Research Institute, Wuhan 430010, China;

    South China University of Technology, Guangzhou 510640, China;

    Changjiang River Scientific Research Institute, Wuhan 430010, China,Research Center on Water Engineering Safety and Disaster Prevention of the Ministry of Water Resources, Wuhan 430010, China;

    Changjiang River Scientific Research Institute, Wuhan 430010, China,Research Center on Water Engineering Safety and Disaster Prevention of the Ministry of Water Resources, Wuhan 430010, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Three Gorges Project; Granite; Alkali activity; Control;

    机译：三峡工程；花岗岩;碱活动；控制;

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