Abstract Thermally damaged concrete recovers its material properties under specific post-heating curing conditions. Among the previous studies to investigate the effects of post-heating curing, the nonlinear resonance vibration method was recently proposed to evaluate contact-type defects of concrete induced by high temperature although the use of physicochemical analysis is not reported to investigate the rehydration products of concrete on post-damage curing conditions. This study performed destructive and nondestructive tests, such as the measurement of tensile strength, dynamic elastic modulus, and hysteretic nonlinear parameter, to evaluate the degree of thermal damage of concrete and its restoration. Various types of concrete samples were prepared according to the different exposures of high temperature and relative humidity for re-curing. In addition, XRD analysis of heated cement pastes was performed to identify the formed and disappeared hydration products, and physicochemical characteristics of thermally damaged concrete was discussed with respect to various exposed temperature and re-curing conditions.

中文翻译：

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再养护条件下热损伤水泥浆和混凝土的物理化学和机械变化

摘要 热损伤混凝土在特定的后热固化条件下恢复其材料性能。在先前研究后加热固化影响的研究中，最近提出了非线性共振振动法来评估高温引起的混凝土的接触型缺陷，尽管没有报道使用物理化学分析来研究混凝土的再水化产物在损伤后固化条件下。本研究进行了破坏性和非破坏性测试，例如测量抗拉强度、动态弹性模量和滞后非线性参数，以评估混凝土的热损伤程度及其修复。根据不同的高温和相对湿度暴露条件制备各种类型的混凝土样品进行再固化。