河水氯盐污染下桥梁混凝土结构腐蚀程度检测方法研究

Detection Method of Corrosion Degree for Bridge Concrete Structure under Chlorine Salt Pollution of River Water

从河水氯盐对混凝土造成腐蚀的内因出发,以交流阻抗计算为核心,提出新型桥梁混凝土腐蚀程度检测方法。预设空间内存密度固定值,建立混凝土腐蚀静电模型,明确桥梁混凝土交流电荷关系,计算桥梁混凝土结构界面电荷,将其引入上述静电模型,提取桥梁定位坐标点,确定边界条件,在条件范围内,依靠模型关系建立等效电路,确定混凝土结构阻抗值,计算桥梁通电时的极化电阻,从而计算出腐蚀钢筋电流的密度,该密度可以直接换算成金属损失率,评价钢筋混凝土的腐蚀程度。

Starting from the internal cause of corrosion of concrete caused by chloride water in rivers,the alternating current impedance calculation is taken as the core,and a new method for detecting the corrosion degree of bridge concrete is proposed.Spatial memory density is predetermined on a fixed value to establish concrete corrosion electrostatic model,clarify the relationship between bridge concrete alternating current charge,calculate the interface charge of bridge concrete structure,introduce into the above electrostatic model,extract the bridge positioning coordinate points,determine the boundary conditions,within the condition range.The equivalent circuit is established by the model relationship,the impedance value of the concrete structure is determined,and the polarization resistance of the bridge when the bridge is energized is calculated,thereby calculating the density of the corroded steel current.The density can be directly converted into the metal loss rate to evaluate the corrosion degree of the reinforced concrete.