碳化与酸雨侵蚀共同作用下钢纤维混凝土的耐久性能

发布时间：2018-04-06 05:03

本文选题：钢纤维混凝土　切入点：碳化　出处：《建筑材料学报》2014年04期

【摘要】：测试了碳化和酸雨侵蚀共同作用下钢纤维混凝土的质量变化率、劈拉强度变化率、溶蚀深度、中性化深度,系统研究了碳化和酸雨侵蚀共同作用下钢纤维混凝土的耐久性能.结果表明:碳化加速了酸雨侵蚀下混凝土的溶蚀;碳化和酸雨侵蚀共同作用下的混凝土质量损失率、劈拉强度损失率以及溶蚀深度都大于单独酸雨侵蚀作用下的混凝土质量损失率、劈拉强度损失率以及溶蚀深度,中性化深度大于单独酸雨侵蚀下中性化深度和单独碳化作用下中性化深度的叠加;碳化与酸雨侵蚀作用对混凝土中性化都有贡献,并且贡献大小几乎相当.适量钢纤维的掺入能有效抑制酸雨侵蚀引起的混凝土溶蚀,并降低混凝土中性化速度;掺1.5%(体积分数)钢纤维混凝土的耐久性能最优.
[Abstract]:The mass change rate, splitting tensile strength change rate, dissolution depth and neutralization depth of steel fiber reinforced concrete under the combined action of carbonization and acid rain were tested. The durability of steel fiber reinforced concrete under the combined action of carbonization and acid rain was studied systematically.The results show that carbonization accelerates the dissolution of concrete under acid rain erosion, and the mass loss rate of concrete under the combined action of carbonization and acid rain erosion.The loss rate of splitting tensile strength and dissolution depth are higher than the mass loss rate, splitting tensile strength loss rate and dissolution depth of concrete under the action of acid rain alone.The neutralization depth is greater than the neutralization depth under the single acid rain erosion and the neutralization depth under the sole carbonization, and both carbonation and acid rain erosion contribute to the neutralization of concrete, and the contribution is almost equal.Proper amount of steel fiber can effectively inhibit the corrosion of concrete caused by acid rain and reduce the neutralization rate of concrete, and the durability of steel fiber reinforced concrete mixed with 1.5 (volume fraction) is the best.
【作者单位】：西安建筑科技大学材料科学与工程博士后科研流动站;重庆大学山地城镇建设与新技术教育部重点实验室;西安建筑科技大学土木工程学院;
【基金】：国家杰出青年科学基金资助项目(50725824) 重庆大学山地城镇建设与新技术教育部重点实验室访问学者基金资助项目
【分类号】：TU528.572

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