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首页> 外文期刊>Bulletin des Laboratoires des Ponts et Chaussees >Application de methodes petrographiques a revaluation de l'etat de degradation du beton affecte par l'alcali-reaction
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Application de methodes petrographiques a revaluation de l'etat de degradation du beton affecte par l'alcali-reaction

机译：岩石学方法在碱反应影响混凝土劣化状态评估中的应用

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摘要

Several procedures using either qualitative or quantitative petrographic examination techniques have been proposed over the past decade to assess the degree of damage in concrete structures. Some of these techniques have focused on large concrete structures exposed to the alkali-aggregate reaction (AAR). In this paper, we begin by presenting a review of the most relevant petrographic methods for concrete condition assessment. Next, the results obtained from petrographic examinations on several concrete specimens (core recovered from a dam, large concrete cubes and laboratory prisms) are discussed. Two methods, performed on polished slabs, have been used. One is based on fluorescent resin, uranyl acetate impregnation and image analysis, and serves to quantify both the degree of cracking and the amount of silica gel produced by AAR. The other method is known as the Damage Rating Index. The results obtained from these methods show that quantitative petrography can be successfully applied on concrete structures in order to assess the degree of deterioration and compare damage across different sections. Petrography could also be used to estimate the evolution stage of the alkali-aggregate reaction and therefore to assess the prediction of future expansion in the concrete specimen core.
机译：在过去的十年中，已经提出了几种使用定性或定量岩相检查技术的程序来评估混凝土结构的破坏程度。这些技术中的一些集中在暴露于碱-骨料反应（AAR）的大型混凝土结构上。在本文中，我们首先对用于具体状态评估的最相关岩相学方法进行综述。接下来，讨论了对几种混凝土标本（从大坝中回收的岩心，大型混凝土立方体和实验室棱镜）进行的岩相学检验结果。已经使用了两种在抛光板上进行的方法。一种是基于荧光树脂，乙酸双氧铀浸渍和图像分析，并用于量化开裂程度和AAR产生的硅胶量。另一种方法称为损坏等级指数。从这些方法获得的结果表明，定量岩石学可以成功地应用于混凝土结构，以便评估劣化程度并比较不同断面的损伤。岩石学还可用于估计碱骨料反应的发展阶段，从而评估混凝土标本芯中未来膨胀的预测。

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