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电化学修复技术是提升既有钢筋混凝土结构耐久性重要方法,能有效除去有害氯离子,延长结构使用寿命。采用电化学修复技术对钢筋混凝土结构进行耐久性修复时,作为阴极的钢筋会发生析氢反应,当钢筋表面的氢浓度达到临界值时,钢筋的塑性会降低,并发展成裂纹,导致钢筋出现氢脆现象。开展了不同电化学参数的电化学修复试验,并采用物理方法和力学方法进行了氢致塑性降低的影响分析。结果表明氢致塑性降低与电流密度、应力水平均相关;当清楚工程构件的受力状态时,可采用合适的电流密度对构件进行电化学修复,控制塑性损失程度在工程的可接受范围内,以达到钢筋氢脆控制的目的。
Electrochemical repair technology is an important method to enhance the durability of existing reinforced concrete structures, which can effectively remove harmful chloride ions and prolong the service life of the structure. When the durability of reinforced concrete structures is repaired by using electrochemical repair technique, hydrogen evolution reaction occurs on the steel bars as the cathode. When the hydrogen concentration on the steel bar surface reaches a critical value, the plasticity of the steel bars will decrease and develop into cracks, resulting in the emergence of hydrogen Crisp phenomenon. Electrochemical repair experiments with different electrochemical parameters were carried out. The effects of hydrogen reduction on plasticity were analyzed by physical and mechanical methods. The results show that the decrease of hydrogen plasticity is related to the current density and the stress level. When the stress state of the engineering component is clear, the current density can be used to electrochemically repair the component to control the degree of plastic loss within the acceptable range of engineering. In order to achieve the purpose of reinforced hydrogen embrittlement.