中文摘要：

利用普通压力机和特制高温炉进行了混凝土在高温降温阶段的轴压力学性能试验研究,试验测试了混凝土在经历升温、降温和恒温过程中的高温变形特性和经历高温再降温过程中的高温抗压强度。试验结果表明,混凝土的高温变形特性和以往文献规律相同,降温阶段的抗压强度虽有一定程度的波动,但总体上波动范围较小,降温阶段高温抗压强度值基本与其所遭受的最高温度下的抗压强度值相当。

英文摘要：

The mechanical behaviors of concrete under axial loading during cooling stage of high temperature exposure were experimentally investigated using a testing machine and a specially-built electrical furnace.The thermal deformations of concrete during the heating and holding stages of high temperature exposure and compressive strength after cooling down to the pre-determined high temperatures were recorded.Test results show that the thermal property of deformations of concrete at high temperatures was similar to that of the previously published literatures.The compressive strengths of concrete at the cooling stage of high temperature exposure were found to had experienced fluctuation to some degree,which varied in a relatively small range.The compressive strength at the cooling stage was equal to the compressive strength at the highest temperature.