硫酸盐侵蚀作用下混凝土损伤层与微观研究

发布时间：2018-02-04 18:31

本文关键词： 混凝土干湿交替硫酸盐侵蚀损伤层厚度　出处：《硅酸盐通报》2015年12期 　论文类型：期刊论文

【摘要】：混凝土损伤层性能劣化规律对研究硫酸盐侵蚀作用下混凝土耐久性具有重要意义。采用超声波平测法,研究了硫酸盐与干湿交替作用下不同水胶比混凝土的损伤层厚度变化规律,从损伤层角度分析了混凝土的损伤劣化特点与性能退化规律,并采用X衍射方法对混凝土中的主要侵蚀产物进行分析。研究结果表明:随着水胶比增大,混凝土中钙矾石和石膏不断增多,氢氧化钙含量逐步减小,宏观表现为混凝土损伤层中超声波速逐渐减小,损伤层厚度增大。当混凝土损伤层越厚、声速越低时,表明其密实度降低,损伤劣化程度增大。通过测量混凝土损伤层厚度,可以有效判断硫酸盐侵蚀作用下混凝土损伤劣化情况。
[Abstract]:It is important to study the durability of concrete under sulfate erosion by using ultrasonic leveling method. The variation of damage layer thickness of concrete with different water-binder ratio under the alternating action of sulphate and dry-wet was studied. The damage deterioration characteristics and performance degradation law of concrete were analyzed from the point of view of damage layer. The results show that with the increase of water-binder ratio, ettringite and gypsum in concrete increase, and the content of calcium hydroxide decreases gradually. Macroscopically, the ultrasonic velocity in the concrete damage layer decreases gradually, and the thickness of the damage layer increases. When the concrete damage layer is thicker, the sound velocity is lower, which indicates that the compactness of the concrete damage layer decreases. By measuring the thickness of concrete damage layer, the damage and deterioration of concrete under sulfate erosion can be effectively judged.
【作者单位】：安阳师范学院建筑工程学院;西安建筑科技大学土木工程学院;
【基金】：教育部创新团队发展计划(IRT13089)
【分类号】：TU528
【正文快照】： 1引言混凝土耐久性是混凝土建筑物在设计和使用过程中的重要问题。然而,由于环境中存在大量侵蚀性离子而导致混凝土结构性能退化的问题普遍存在。其中,硫酸盐侵蚀是众多侵蚀破坏中分布广泛且常见的破坏形式。硫酸盐侵蚀导致混凝土膨胀、开裂和强度下降,严重影响混凝土结构物的

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