关键词: 横向裂缝;干湿循环;氯离子;浓度分布;裂缝影响区域

Abstract: The chloride ion concentration distribution and crack-influenced area in concrete crack area under dry-wet cycle are studied.Concrete samples with different widths of transverse crack are exposed in the chloride dry-wet cycle environment for accelerating chloride ion erosion into concrete.The chloride ion concentration in the side of the crack and from the surface of the specimen to the steel bar of different erosion cycles is regularly detected.The test results show that chloride concentration decreases with the increase of transmission depth, and achieves stability at 20 mm.With the dry-wet cycle progressing, after 20 dry-wet cycle periods, chloride concentration in specimen with crack width from 0.1 mm to 0.5 mm is over 0.1% on the side of crack by 30 mm, which means the steel in this section is in danger of corrosion.Meanwhile, because of the influence of two dimensional transmissions, the greater crack width, the higher chloride concentration of same transmission depth is.

Key words: transverse crack;dry-wet cycle;chloride ion;concentration distribution;crack influence