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首页> 外文期刊>ACI Materials Journal >Alkali-Silica Reaction as Cause of Distress in Concrete Pavements Made from Purported Alkali-Carbonate Reaction Aggregate
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Alkali-Silica Reaction as Cause of Distress in Concrete Pavements Made from Purported Alkali-Carbonate Reaction Aggregate

机译：碱 - 二氧化硅反应作为由碱碳酸盐聚集体制成的混凝土路面中遇险的原因

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摘要

The mechanism of alkali-carbonate reaction (ACR) is still controversial. ACR distress in concrete has been described as an increase in volume caused by the crystallization of brucite following dedo-lomitization. In this study, the cause of concrete distress in reported ACR-damaged concrete pavements was investigated, and it was determined that alkali-silica reaction (ASR) was the cause of the damage. Optical microscopy and scanning electron microscopy with energy-dispersive spectroscopy (SEM-EDS) analyses identified ASR gel extending from reactive aggregates into the paste, X-ray elemental mapping confirmed the composition of the gel, and EDS determined the amount of each element in the ASR gel spectra. Silica in the form of cryptocrystalline-microcrystalline quartz was found in the matrix of reactive aggregates and was the source of reactive silica. The test results confirmed that ASR caused the damage to the primary concrete pavements and present the first case ever reported in the United States in which ASR is the main cause of concrete damage in concrete made from carbonate aggregate exhibiting a classic texture and composition cited for ACR.
机译：碱碳酸盐反应的机理（ACR）仍有争议。在混凝土ACR窘迫已经被描述为引起水镁石的以下DEDO-lomitization结晶体积增加。在这项研究中，在报道的ACR-损坏混凝土路面混凝土窘迫的原因进行了研究，并已确定碱 - 二氧化硅反应（ASR）是损坏的原因。光学显微镜和具有能量散射光谱（SEM-EDS）的扫描电子显微镜分析从反应性的聚集体延伸到所述糊识别ASR凝胶，X射线元素映射确认凝胶的组合物，和EDS确定在各元素的量ASR凝胶光谱。二氧化硅在隐 - 微晶石英的形式在反应的聚集体的基质被发现并且是​​反应性二氧化硅的来源。试验结果证实，ASR造成的初级混凝土路面的损伤并呈现在美国以往报告的第一个情况，其中ASR是在混凝土从碳酸盐骨料制成混凝土损伤的主要原因表现出经典的质地和组合物引为ACR 。

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