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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.
The volume expansion rate of steel rust during the corrosion cracking of reinforced concrete structure in chloride salt environment was studied by means of electrified accelerated corrosion test.The results showed that the main components of steel rust were Fe2O3 and Fe3O4 And FeO (OH), which are similar to those of natural corrosion. The theoretical calculation formula of the volumetric expansion rate of rust and its variation range are obtained through the derivation analysis, which shows that the volume expansion rate of rust is only related to the density, expansion rate and mass of each rust product According to the established formulas, further analysis of the experimental data of this study and different scholars shows that the volume expansion rate of rust formation in concrete is between 2.26 and 3.00 after corroded by concrete; the volume expansion of rust of steel bar before and after the cracking of the protective layer The rate is not sensitive to the corrosion mode. The effects of different accelerated corrosion methods on the volumetric expansion rate of steel rust in concrete specimens are not significant.