Abstract The influence of temperature on the expansive behavior and microstructural damage of concrete due to the alkali–silica reaction (ASR) is studied experimentally by applying a new testing protocol, the Alkali-Wrapped Concrete Prism Test (AW-CPT). Early-stage expansion is highly dependent on temperature, more so than expansion in later stages. In the early stages of expansion, the ASR gel is well restrained so that the early-stage expansion rate mainly depends on reaction kinetics. In later stages, since the viscosity of the ASR gel is lower at higher temperatures, it flows out of the concrete prism through small cracks or pores, resulting in reduced paste cracking and an increased silica content detected in the wrapping cloth at higher temperatures. Consequently, the late-stage expansion rate is found to be reduced at higher temperatures. Therefore, greatly accelerated test conditions may lead to reduced expansion of the concrete prism during the AW-CPT.

中文翻译：

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由于碱-二氧化硅反应，温度对高活性安山岩混凝土膨胀性能的影响

摘要 通过应用一种新的测试协议——碱包混凝土棱镜测试 (AW-CPT)，实验研究了温度对混凝土膨胀行为和由于碱硅反应 (ASR) 造成的微观结构损伤的影响。早期膨胀高度依赖于温度，而不是后期膨胀。在膨胀的早期阶段，ASR 凝胶受到很好的约束，因此早期膨胀率主要取决于反应动力学。在后期阶段，由于 ASR 凝胶的粘度在较高温度下较低，因此它会通过小裂缝或孔从混凝土棱柱体中流出，导致在较高温度下在包裹布中检测到的糊料开裂减少和二氧化硅含量增加。因此，发现后期膨胀率在较高温度下降低。