用三维彩色扫描技术量化表征氯盐致混凝土中钢筋的不均匀锈蚀
发布时间：2018-09-11 15:12
【摘要】：采用三维彩色扫描技术和线性极化电阻测试方法研究了盐水浸烘条件下表面涂覆迁移性阻锈剂(PCI-2015)对含氯盐混凝土中钢筋锈蚀状况的影响,计算了浸烘前后钢筋腐蚀电流密度(I_(corr)),运用逆向工程软件获得了剖开锈蚀钢筋表面积、截面积等参数,并对钢筋沿纵向各截面积进行统计分析。结果表明:表面涂覆400 g/m~2的PCI-2015及防水剂的混凝土试件,浸烘循环后I_(corr)平均值为0.17μA/cm~2,平均锈蚀面积9.58%,未涂覆的空白组I_(corr)平均值为1.04μA/cm~2,平均锈蚀面积为71.75%;氯盐致钢筋不均匀锈蚀的横截面积服从三参数Weibull分布,涂覆组与空白组横截面积分布的阈值参数分别为27.67和27.49,形状参数分别为1.15和2.24,涂覆组钢筋截面均匀且腐蚀较少,钢筋腐蚀累积损伤程度较低;用三维彩色扫描技术量化表征氯盐致混凝土中钢筋不均匀锈蚀是一种较为可行的方法。
[Abstract]:Three-dimensional color scanning technique and linear polarization resistance measurement method were used to study the effect of surface coating on corrosion of steel bar in chloride containing concrete under saltwater immersion and drying conditions, and the effect of migration inhibitor (PCI-2015) on the corrosion of steel bar in concrete containing chloride was studied by means of three-dimensional color scanning technique and linear polarization resistance measurement method. The corrosion current density (I _ (corr),) of steel bar before and after immersion and drying was calculated. The surface area and section area of corroded steel bar were obtained by using reverse engineering software. The results show that the concrete specimens coated with 400 g/m~2 PCI-2015 and water-repellent, The average value of I _ (corr) was 0.17 渭 A / cm ~ (-2), the average corrosion area was 9.58%, the average value of I _ (corr) was 1.04 渭 A / cm ~ (-2) and the average corrosion area was 71.75% in uncoated blank group, and the cross-sectional area of non-uniform corrosion caused by chloride salt was distributed from three parameter Weibull. The threshold parameters of cross-sectional area distribution in coating group and blank group were 27.67 and 27.49, and the shape parameters were 1.15 and 2.24, respectively. It is a feasible method to quantitatively characterize the inhomogeneous corrosion of steel bars in chloride-induced concrete by three-dimensional color scanning technique.
【作者单位】： 烟台大学土木工程学院;
【基金】：国家自然科学基金(51278443,51678520)
【分类号】：TU528
，
本文编号：2237057
[Abstract]:Three-dimensional color scanning technique and linear polarization resistance measurement method were used to study the effect of surface coating on corrosion of steel bar in chloride containing concrete under saltwater immersion and drying conditions, and the effect of migration inhibitor (PCI-2015) on the corrosion of steel bar in concrete containing chloride was studied by means of three-dimensional color scanning technique and linear polarization resistance measurement method. The corrosion current density (I _ (corr),) of steel bar before and after immersion and drying was calculated. The surface area and section area of corroded steel bar were obtained by using reverse engineering software. The results show that the concrete specimens coated with 400 g/m~2 PCI-2015 and water-repellent, The average value of I _ (corr) was 0.17 渭 A / cm ~ (-2), the average corrosion area was 9.58%, the average value of I _ (corr) was 1.04 渭 A / cm ~ (-2) and the average corrosion area was 71.75% in uncoated blank group, and the cross-sectional area of non-uniform corrosion caused by chloride salt was distributed from three parameter Weibull. The threshold parameters of cross-sectional area distribution in coating group and blank group were 27.67 and 27.49, and the shape parameters were 1.15 and 2.24, respectively. It is a feasible method to quantitatively characterize the inhomogeneous corrosion of steel bars in chloride-induced concrete by three-dimensional color scanning technique.
【作者单位】： 烟台大学土木工程学院;
【基金】：国家自然科学基金(51278443,51678520)
【分类号】：TU528
，
本文编号：2237057
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