干湿循环腐蚀环境下钢筋混凝土柱的锈胀裂缝分析  

Corrosive crack analysis of reinforced concrete columns under wet-dry cycles and corrosive environment

作　　者：雷超[1] 方从启[1] 胡冉[1] 杨帅[1] 薛文韬[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《混凝土》2017年第6期24-27,共4页Concrete

基　　金：国家自然科学基金项目(51178264);铁道部科技研究开发项目(J2011G003)

摘　　要：通过7组钢筋混凝土墩柱的通电锈蚀及干湿循环试验,研究氯盐侵蚀和干湿循环作用对混凝土墩柱锈胀裂缝形态及分布的影响。试验通过控制通电电流和通电时间得到试件不同的钢筋腐蚀率;通过控制试件浸泡盐溶液的水位高低的周期性变化实现试件的干湿循环作用。试验结果表明:在腐蚀率相近时,干湿循环腐蚀试件相较单一腐蚀试件而言,其锈胀裂缝数量有着明显的增加,试件的最大裂缝宽度至多增加约100%,其平均裂缝宽度则至多增加约83.3%。Under the wet-dry cycles and accelerated corrosion test, 7 reinforced concrete columns were tested to investigate the impact of chloride ion corrosion and wet-dry cycle on the shape and the distribution of corrosive cracks.The corrosion rate was controlled by the intensity of electric current and the power-on time.The wet-dry cycle was controlled by the periodic change of the level of salt solutions. The results show that, under the same corrosion rate, comparing to the specimens under effect of corrosion, the number of corrosive cracks of specimens under the effect of corrosion and wet-dry cycles showed an obvious increase, the maximum crack width showed an increased up to about 100% ,the average crack width showed an increase up to about 83.3%.

关 键 词：干湿循环 腐蚀 裂缝 混凝土墩柱 

分 类 号：TU528.01[建筑科学—建筑技术科学]