混凝土溶蚀加速实验方法综述

混凝土遭受到水的侵蚀破坏,其中的水化产物氢氧化钙析出,这种现象称为混凝土溶出性侵蚀,简称溶蚀,是水工混凝土结构破坏的主要原因之一。一方面,溶蚀导致混凝土强度、密实度下降,孔隙率增加,另一方面,对于钢筋混凝土,钙质的流失会导致空气及水中的氧进入钢筋表面的混凝土保护层,导致钢筋锈蚀。混凝土溶蚀是一个极其缓慢的过程,通常需要十几年甚至几十年的时间,这给试验室研究其破坏机理和影响因素造成一定的不便。归纳了5种常见的混凝土溶蚀加速方法,分别对其加速机理、试验方法、适用范围和优缺点进行了分析总结,并归纳了混凝土溶蚀破坏评价指标及其测试方法,以期为混凝土溶蚀加速试验提供一定的参考。

Summary of experimental methods for accelerated concrete corrosion

Concrete is damaged by water erosion,and the hydration product calcium hydroxide is precipitated.This phenomenon is called concrete dissolution erosion,which is called dissolution,and is one of the main causes of hydraulic concrete structure damage.On the one hand,the dissolution leads to a decrease in strength and compactness of the concrete,and an increase in porosity.On the other hand,for reinforced concrete,the loss of calcium causes the oxygen in the air and water to enter the concrete protective layer on the surface of the steel bar,causing corrosion of the steel.Concrete erosion is an extremely slow process that usually takes ten or even decades,which causes some inconvenience to the laboratory to study its failure mechanism and influencing factors.It summarizes five common methods for accelerating concrete erosion,and analyzes and summarizes its acceleration mechanism,experimental method,scope of application,advantages and disadvantages,and summarizes the evaluation index and test method of concrete corrosion damage,in order to accelerate the concrete dissolution test.Provide a certain reference.