透水混凝土的冻融破坏一直是一个影响其在北方地区大规模推广的严重问题,为解决这些问题,分别用粉煤灰、乙烯-醋酸乙烯酯(EVA)乳胶和聚乙烯纤维作为掺合料,通过用掺合料置换透水混凝土混合物中不同比例的水泥来分析掺合料比例的影响,对透水混凝土的渗透性、抗压强度等基本物理性能作了验证试验,采用快冻法以质量损失率和相对动弹模量来评价透水混凝土的冻融循环性能.试验结果表明,不同掺合料对透水混凝土的冻融循环性能均有一定的有利作用,但影响程度和作用机理不同.
Freeze-thaw damage of pervious concrete has been a serious problem which discourages its application in north China.To solve this problem, a series of experiments were carried out to study the effect of admixtures on compressive strength and freeze-thaw resistance of pervious concrete.Three admixtures, fly ash, ethylene vinyl acetate (EVA) latex and polyethylene fiber with different replacement of cement were used in this study, and physical properties such as permeability and compressive strength were tested.The freeze-thaw cycle tests were conducted base on fast freeze-thaw test.Mass loss and dynamic modulus were chosen for evaluation index.The results indicate that positive effects are found on freeze-thaw resistance for pervious concrete specimens with the addition of admixtures, but the degree and mechanism of effects are different for different admixtures.
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