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生态型高延性水泥基复合材料的高温损伤

DOI: 10.7521/j.issn.0454-5648.2014.08.10

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Abstract:

为了研究生态型高延性水泥基复合材料(ECO-HDCC)在高温作用后的力学性能及损伤机理,研究了高温作用对混凝土抗压强度和对ECO-HDCC微观形貌和物相组成的影响。结果表明300℃时ECO-HDCC抗压强度降低不明显;500℃时ECO-HDCC抗压强度损失率为32.6%~58.0%;800℃时ECO-HDCC抗压强度持续降低,损失率为58.9%~77.8%;1100℃时ECO-HDCC无继续承载能力,损失率最高达92.5%。纤维熔化产生大量孔道和水化产物分解导致基体结构密实性降低,使ECO-HDCC抗压强度降低,也为ECO-HDCC在高温作用下形成的应力提供了释放通道,使ECO-HDCC在1100℃高温作用下持续180min仍未发生爆裂。

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