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工程力学  2013 

基于微观结构分析的再碱化对高温后混凝土抗压强度修复试验研究

DOI: 1000-4750(2013)06-0205-07, PP. 205-211

Keywords: 地下工程,围岩,水工压力隧洞,混凝土衬砌,初裂裂缝间距,释放应力,混凝土,高温,试验,再碱化,微观结构,抗压强度

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Abstract:

该文对高温作用经再碱化修复后的混凝土进行了压汞测孔试验及抗压强度试验,研究了混凝土微观结构与其宏观力学性能之间的关系。试验结果表明,高温后混凝土的抗压强随着温度升高呈现下降的趋势,混凝土的微观结构变差,粗大孔明显增多;经再碱化修复后,混凝土的抗压强度得到一定程度的提高,微观结构得到明显改善,粗大孔明显减少。混凝土微观结构的变化与其宏观力学性能一致,说明了再碱化可以一定程度的修复高温作用后混凝土的力学性能,同时改善混凝土的耐久性能。

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