超高延性水泥基复合材料耐久性研究进展

Research progress on durability of ultra-high engineered cementitious composites

普通混凝土在特殊环境下容易出现性能劣化、耐久性不足的问题。超高延性水泥基复合材料(ECC)是一种纤维增强水泥复合材料,在拉伸载荷作用下产生微裂纹后具有应变硬化和自愈合能力,使ECC在各种环境条件下比普通混凝土有更佳的耐久性。综述了近年来国内外关于ECC耐久性的研究进展,总结了ECC在抗渗性、抗冻性、耐化学侵蚀性能、耐高温性、耐磨性相关方面的特点,并与普通混凝土进行了对比。研究发现:目前关于多因素耦合条件下ECC的耐久性研究、耐久性微观层面解释以及设计耐高温、耐磨性好的ECC等方面研究还不充分,基于此提出了几个未来研究方向。

Ordinary concrete is prone to face performance degradation and insufficient durability in special environments.Ultra-high engineered cementitious composites(ECC)is a kind of fiber reinforced cement composite material.It has strain hardening and self-healing ability after microcracks formation under tensile load,which makes ECC possess better durability than ordinary concrete under various environmental conditions.In this paper,the research progress of ECC durability at home and abroad in recent years was reviewed.The characteristics of impermeability,frost resistance,chemical corrosion resistance,high temperature resistance and wear resistance of ECC were summarized and compared with ordinary concrete.It was found that studies on the durability under the condition of multi-factor coupling,the interpretation in term of micro level of durability,and the design of ECC with high temperature resistance and good wear resistance were not sufficient.Based on this,several research directions in the future were put forward.