冷却方式对高温后ECC力学性能的影响

研究了冷却方式对高温后ECC(Engineered Cementitious Composites)残余力学性能的影响.将ECC试件加热至不同的温度(200，400，600和800 ℃)，采用不同的方式冷却(自然冷却和浸水冷却)，然后测试其力学性能.结果表明，浸水冷却的试件残余力学性能优于自然冷却的试件，且温度越高，冷却方式的影响越大.高温前后ECC的微观结构可以通过扫描电子显微镜(SEM)法和压汞试验(MIP)分析，微型测试结果可以很好的解释高温后ECC试件力学性能的变化.
This paper studied the influence of cooling regimes on the residual mechanical properties of ECC (Engineered Cementitious Composites) after high temperatures. The ECC specimens were heated to different temperatures (200, 400, 600 and 800 ℃) and cooled in different regimes (cooling in air and quenching in water). The residual mechanical properties were tested. The results indicated that the specimens quenching in water gained better mechanical properties than the one cooling in air and the influence of cooling regimes increased with temperature. The micro structural characterization was examined before and after exposure to fire deterioration by using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) test. The results from the micro test explained the mechanical property variation of post-fire specimens.