混凝土结构中钢筋锈蚀物体积膨胀率研究

发布时间：2018-04-14 22:35

本文选题：钢筋混凝土 + 通电锈蚀　；参考：《华中科技大学学报(自然科学版)》2015年09期

【摘要】：采用通电加速锈蚀法对氯盐环境下钢筋混凝土结构保护层锈胀开裂时钢筋铁锈的体积膨胀率进行了研究.结果表明:采用低电流密度进行通电锈蚀时,钢筋铁锈的主要成分为Fe2O3,Fe3O4和FeO(OH),与自然锈蚀情况相似;通过推导分析得到了铁锈体积膨胀率的理论计算公式及其变化范围,表明铁锈的体积膨胀率仅与其所含各锈蚀产物的密度、膨胀率和质量分数有关.利用所建立公式对本研究及不同学者的试验数据进一步分析表明:混凝土中钢筋锈蚀后,生成铁锈的体积膨胀率在2.26~3.00之间;保护层锈胀开裂前后,钢筋铁锈的体积膨胀率对锈蚀方式不敏感,不同加速锈蚀法对混凝土试件内钢筋铁锈的体积膨胀率的影响不显著.
[Abstract]:The volume expansion rate of steel bar rust was studied by means of accelerated corrosion method under chloride environment when the protective layer of reinforced concrete structure was corroded and cracked.The results show that the main components of ferrorust are Fe _ 2O _ 3H _ 3O _ 4 and Fe _ 2O _ 3O _ 4, which are similar to those of natural rust, and the theoretical calculation formula of volume expansion rate of rust and its range of variation are obtained by deducing and analyzing.The results show that the volume expansion rate of rust is only related to the density, expansion rate and mass fraction of rust products.By using the established formula and the experimental data of different scholars, it is shown that the volume expansion rate of rust in concrete is between 2.26 and 3.00, and the bulging rate of the protective layer is before and after the corrosion cracking.The volume expansion rate of steel bar rust is not sensitive to the corrosion mode, but the effect of different accelerated corrosion methods on the volume expansion rate of steel bar rust in concrete specimen is not significant.
【作者单位】：三峡大学土木与建筑学院;三峡地区地质灾害与生态环境湖北省协同创新中心;
【基金】：国家自然科学基金资助项目(51109121,51379111)
【分类号】：TU375

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