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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。
In this paper, mercury porosimetry and compressive strength tests were carried out on concrete subjected to re-alkalization after high temperature. The relationship between microstructure and macroscopic mechanical properties of concrete was studied. The experimental results show that the compressive strength of concrete decreases with the increase of temperature after high temperature, the microstructure of concrete deteriorates and the number of coarse pores increases obviously. After re-alkalization, the compressive strength of concrete increases to a certain extent , The microstructure has been significantly improved, significantly reduced coarse pores. The changes of the microstructure of the concrete are consistent with the macroscopic mechanical properties, which shows that the re-alkalization can repair the mechanical properties of the concrete under high temperature to a certain extent and improve the durability of the concrete at the same time.