Environmental conditions critically affect the expansion behaviour of concrete due to alkali–silica reaction (ASR) and, therefore, must be modelled to predict ASR-induced expansion behaviour. In addition, laboratory tests are important for the provision of useful data for numerical models, since these models often require the calibration of some unknown parameters according to the materials tested. To address this, the authors have developed a testing method for concrete expansion, called the alkali-wrapped concrete prism test (AW-CPT). Predictions using the results of the AW-CPT would be beneficial for the assessment of potential expansion of concrete when exposed to the outdoor environment. In this study, the effects of environmental conditions on ASR-induced expansion behaviours are determined through exposure and laboratory tests. The environmental conditions are modelled and implemented in numerical simulations. The results indicate that solar insolation and rainfall are critical parameters for modelling the environmental conditions as well as ambient temperature and relative humidity.

中文翻译：

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碱硅反应对混凝土膨胀的环境影响

由于碱硅反应 (ASR)，环境条件严重影响混凝土的膨胀行为，因此，必须建模以预测 ASR 引起的膨胀行为。此外，实验室测试对于为数值模型提供有用的数据很重要，因为这些模型通常需要根据测试的材料对一些未知参数进行校准。为了解决这个问题，作者开发了一种混凝土膨胀测试方法，称为碱包裹混凝土棱柱测试 (AW-CPT)。使用 AW-CPT 的结果进行预测将有助于评估暴露于室外环境时混凝土的潜在膨胀。在这项研究中，环境条件对 ASR 诱导的膨胀行为的影响是通过暴露和实验室测试确定的。在数值模拟中对环境条件进行建模和实施。结果表明，日照和降雨量是模拟环境条件以及环境温度和相对湿度的关键参数。