Alkali–Silica Reaction (ASR) occurs between cement alkalis and some aggregate types and causes expansion and damage in concrete. The most common and effective way to rate the severity of ASR damage in structural members is to conduct crack imaging and microstructural analysis on the core samples taken from the structures. However, it is also essential to monitor the damage with non-destructive testing methods to identify them without damaging the structure and taking necessary precautions. In this context, Acoustic Emission (AE) is of great benefit for this purpose as an effective method of monitoring active damage. The limited number of studies in the literature to assess alkali–silica reaction by AE are conducted on mortar specimens containing only reactive fine particles as aggregate under RILEM AAR-2 (80 °C, 1 N NaOH) test conditions. In this regard, this paper includes findings of a study in which progress of cracking due to ASR damage monitored by AE during fourteen weeks under RILEM AAR-4 (60 °C, over water in sealed containers) conditions, which allows testing combinations of fine and coarse aggregates. In addition to AE monitoring during the exposure period, expansion and damage rating index (DRI) were determined at different time intervals. This study was further from the existing studies in the literature; DRI identified the type and extent of cracking in either cement paste or aggregate, and AE parameters such as amplitude, energy, duration, and count were associated with the data obtained by DRI analysis. Besides, correlations between expansion, non-destructive and microstructural results were analyzed.

碱-二氧化硅反应 (ASR) 发生在水泥碱和某些骨料类型之间，并导致混凝土膨胀和损坏。评估结构构件中 ASR 损坏严重程度的最常见和有效的方法是对从结构中取出的岩心样品进行裂纹成像和微观结构分析。但是，还必须使用无损检测方法来监测损坏情况，以便在不损坏结构的情况下识别它们并采取必要的预防措施。在这种情况下，声发射 (AE) 作为一种有效的主动损伤监测方法，为此目的非常有用。文献中通过 AE 评估碱 - 二氧化硅反应的研究数量有限，是在 RILEM AAR-2（80 °C，1 N NaOH）测试条件下对仅含有活性细颗粒作为骨料的砂浆试样进行的。在这方面，本文包括一项研究的结果，其中 AE 在 14 周内在 RILEM AAR-4（60 °C，密封容器中的水）条件下监测由于 ASR 损坏导致的开裂进展，这允许测试精细的组合和粗骨料。除了暴露期间的 AE 监测外，还在不同的时间间隔确定了膨胀和损坏评级指数 (DRI)。这项研究是进一步从现有的文献研究；DRI 确定了水泥浆或骨料开裂的类型和程度，并且 AE 参数（如振幅、能量、持续时间和计数）与 DRI 分析获得的数据相关联。此外，还分析了膨胀、无损和微观结构结果之间的相关性。本文包括一项研究的结果，其中 AE 在 14 周内在 RILEM AAR-4（60 °C，密封容器中的水）条件下监测由于 ASR 损坏而导致的开裂进展，该条件允许测试细骨料和粗骨料的组合。除了暴露期间的 AE 监测外，还在不同的时间间隔确定了膨胀和损坏评级指数 (DRI)。这项研究是进一步从现有的文献研究；DRI 确定了水泥浆或骨料开裂的类型和程度，并且 AE 参数（如振幅、能量、持续时间和计数）与 DRI 分析获得的数据相关联。此外，还分析了膨胀、无损和微观结构结果之间的相关性。本文包括一项研究的结果，其中 AE 在 14 周内在 RILEM AAR-4（60 °C，密封容器中的水）条件下监测由于 ASR 损坏而导致的开裂进展，该条件允许测试细骨料和粗骨料的组合。除了暴露期间的 AE 监测外，还在不同的时间间隔确定了膨胀和损坏评级指数 (DRI)。这项研究是进一步从现有的文献研究；DRI 确定了水泥浆体或骨料中开裂的类型和程度，并且诸如振幅、能量、持续时间和计数等 AE 参数与通过 DRI 分析获得的数据相关联。此外，还分析了膨胀、无损和微观结构结果之间的相关性。