Influence of Pore Structure on Chloride Penetration in Cement Pastes Subject to Wetting-Drying Cycles. (12th December 2019)

• Record Type: Journal Article
• Authors: Chang, Honglei; Zuo, Zhiwu; Qu, Mingyue; Wang, Fei; Ge, Zhi; Liu, Jian
• Other Names: Narayan Roger Academic Editor.
• Is Part Of: Advances in materials science and engineering. Volume 2019(2019)
• Publication Date: 2019-12-12
• Subjects: Materials science -- Periodicals; Materials science; Periodicals; 620.11
• DOI: 10.1155/2019/3909348
• Languages: English
• ISSNs: 1687-8434

Abstract

Abstract : Copious studies have discovered a phenomenon that a chloride concentration peak appears on the surface of concrete under cyclic drying-wetting environments. In such cases, the chloride diffusion coefficient ( D ) obtained through directly fitting the standard error function of Fick's second law is no longer accurate. The more reliable D obtained by the method proposed by Andrade is employed in this research to investigate the influence of pore structure on chloride penetration rate of pastes. The results show that both the effective coefficient ( D eff ) and the apparent coefficient ( D app ) increase with total porosity, the most probable pore size, and water absorption porosity, suggesting that the increase of the three pore structure parameters accelerates chloride penetration rate under cyclic wetting-drying condition. The increase of the three parameters makes more room available and eases the difficulty for salt solution to enter the matrix and thus leads to the augmentation of chloride transporting in matrix.