摘   要：对C40高性能混凝土（简称HPC）不同高温作用后，采用自然冷却和喷淋冷却两种方式冷却至常温，研究其抗压强度和劈裂抗拉强度的变化。试验结果表明，两种冷却方式均使C40高性能混凝土抗压强度及劈拉强度总体呈下降趋势，但自然冷却后，混凝土抗压强度在300℃出现反弹，劈拉强度一致下降；喷淋冷却后，抗压强度和劈裂抗拉强度均一致下降。初步探讨了高温后混凝土性能劣化的机理。

Abstract: The variation of compressive strength and splitting tensile strength of C40 high performance concrete (HPC) is comparatively studied and discussed, using natural cooling and spray cooling to room temperature after exposed to different high temperatures. The test results show that the compressive strength and splitting tensile strength of C40 HPC are totally in downward trend under the two cooling ways after high temperatures, nevertheless, the compressive strength recover when naturally cooled after heated to 300℃. After the spray cooling, compressive strength and splitting tensile strength decline consistently. At the same time, the degradation mechanism of HPC after high temperature is explored.