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研究了高温后ECC(经设计的水泥基复合材料)的残余力学性能。将ECC试件分别加热到不同的温度(200、400、600和800℃),保持不同的恒温时间(0.5、1和2 h)。结果表明,试件自然冷却后受压,200℃除外,发现ECC的强度和刚度随温度和恒温时间增加而降低。采用MIP(压汞)试验测试试件的孔结构,发现试件总孔隙率和平均孔径随温度和恒温时间的增加而增加(200℃除外),这很好地解释了火后ECC试件力学性能的变化。
The residual mechanical properties of ECC (designed cement-based composites) after high temperature were studied. The ECC specimens were heated to different temperatures (200, 400, 600 and 800 ° C), respectively, for different isothermal times (0.5, 1 and 2 h). The results show that the specimen cooled naturally after compression, except for 200 ℃, found that the strength and stiffness of ECC decreases with increasing temperature and constant temperature time. The hole structure of the specimen was tested by MIP (mercury intrusion) test. It was found that the total porosity and average pore diameter of the specimen increased with the increase of temperature and temperature (except 200 ℃), which explained well the post-fire ECC specimen mechanics Performance changes.