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研究了在0.3%、0.5%、1.0%以及2.0%不同程度预加拉伸应变破坏下,两种不同配比、不同龄期的高延展性纤维增强水泥基复合材料M45-ECC及HFA-ECC的残余应变、裂缝分布特性、干湿自愈合循环环境中共振频率的恢复情况以及自愈合产物的微观特性。结果表明:ECC试件的残余应变约等于预加应变的50%左右;90d龄期试件拥有更多及更小宽度的裂缝;干湿循环有利于ECC材料的自愈合,大部分共振频率值的恢复都发生在4～5个循环之前;HFA-ECC的共振频率恢复值略高于M45-ECC;自愈合产物包括“纤维状”的水化硅酸钙凝胶及“颗粒状”的CaCO_3。
The effects of M45-ECC and HFA-ECC of two kinds of high ductility fiber-reinforced cement-based composites with different proportions and different ages under the prestressed tensile strain of 0.3%, 0.5%, 1.0% and 2.0% The residual strain, the fracture distribution, the recovery of resonance frequency in the wet-dry self-healing cycle environment and the microscopic characteristics of the self-healing product. The results show that the residual strain of ECC specimen is about 50% of that of prestrain strain, and the cracks of more and smaller widths in 90d age specimen are better. The wet-dry cycles are good for the self-healing of ECC material. Most of the resonance frequency The recovery of the values occurred before 4 to 5 cycles. The resonance frequency recovery value of HFA-ECC was slightly higher than that of M45-ECC. The self-healing products included the “fibrous” hydrated calcium silicate gel and the “ Granular ”CaCO_3.