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2h).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.
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