氯盐侵蚀纤维混凝土的损伤劣化规律

Damage and Deterioration of Fiber Reinforced Concrete in Chloride Corrosion Environment

本研究通过氯盐溶液浸泡试验,以侵蚀龄期内钢纤维(SFs)体积掺量(2%、4%)、聚乙烯醇纤维体积掺量(0.05%、0.1%)、粉煤灰质量替代率(15%、30%)为影响因素,逐一测量混凝土的质量、相对动弹性模量、抗压强度及劈裂抗拉强度损失,研究氯盐侵蚀环境下混凝土的损伤劣化规律。结果表明,钢纤维(SFs)掺量越高混凝土抗压强度和劈裂抗拉强度越好,而掺入0.1%的聚乙烯醇纤维和30%的粉煤灰时,可以有效抑制混凝土动弹性模量损失并提高劈裂抗拉能力。建立了拟合度较高的可以有效反映氯盐侵蚀环境下混杂纤维混凝土损伤劣化规律的二次函数损伤模型。

In this study, the volume content of steel fiber(SFs)(2%, 4%), polyvinyl alcohol fiber(0.05%, 0.1%), and the replacement rate of fly ash(15%, 30%) during the corrosion process are taken as the influencing factors through the chloride solution immersion test. The quality, relative dynamic modulus of elasticity, compressive strength, and splitting tensile strength loss of concrete are measured one by one to study the damage rule of concrete under the chloride solution corrosion environment. The results show that the higher the amount of steel fiber(SFs) is added, the better the compressive strength and splitting tensile strength of concrete. When 0.1% polyvinyl alcohol fiber and 30% fly ash are added, the loss of dynamic elastic modulus of concrete can be effectively restrained and the splitting tensile strength can be improved. A quadratic function damage model with a high fitting degree is established, which can effectively reflect the damage rule of hybrid fiber reinforced concrete under chloride corrosion environment.