Experimental Study and Numerical Analysis on Chloride Diffusion Coefficient of Concrete with Various Water-Cement Ratios

Abstract:

A rapid chloride ion diffusion coefficient measurement (RCM) was used in this study. The influence of water-cement ratios of 0.30, 0.35 and 0.40 at various ages (3, 7, 14, 28 and 56 days) on chloride ion diffusion coefficient of the concretes and pastes was studied and analyzed. The results show that, with the increase of curing ages, the chloride ion diffusion coefficient of different water-cement ratio of each specimen is decreased. In the early age, the chloride ion diffusion coefficient of the paste with the water-cement ratio of 0.40 is 2~3 times of the paste with water-cement ratio of 0.30 and 0.35, and with the increase of curing age, this difference is gradually decreased. Additionally, the chloride ion diffusion coefficient of the cement paste is 1~2 times of the concrete with same water-cement ratio at different ages. Based on the actual experiment boundary conditions, the process of chloride ions diffusion and permeability was simulated by COMSOL software, and the simulation result was analyzed to predict the permeability of concrete.

• Periodical: Key Engineering Materials (Volume 726)
• Pages: 547-552
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.726.547
• Online since: January 2017
• Authors: Zheng Ren, Lian Zhen Xiao*, Wen Chong Shi
• Keywords: Chloride Ion Diffusion Coefficient, COMSOL, Concrete, RCM

References

[1] F. M. Li, T. C. Deng, J. H. Wang, X. Y. Luo, J. Architecture and Civil Engineering. 2 (2015) 1-20.

[2] Z. Lv, W. H. Li, C. Z. Zong, J. Highway and Transportation Res. Develop. 9 (2010) 130-134.

[3] L. Zhou, Bridge Construction. 4 (2000) 58-61.

[4] N. Otsuki, S. Miyazato, N.B. Diola, H. Suzuki, ACI Materials Journal. 6 (2000) 454-464.

[5] C. M. Aldea, S. P. Shah, A. Karr, J. Materials in Civil Engineer. 3 (1999) 181-187.

[6] H.J. Ba, W. M Zhang, H. W. Deng, Concrete. 9 (2005) 18-19.

[7] J. H. Wu, Y. M. Zhang, Concrete. 2 (2009) 38-41.

[8] L. J. Wu, D. H. Deng, Z. ZENG, T. P. Yuan, Concrete. 1 (2006) 100-103.

[9] R. H. Mills, Factors influencing cessation of hydration inwater-cured cement pastes, Washington, D. C.: Proceeding of the Symposium on the Structure of Portland Cement Paste and Concrete. 1996406-424.

[10] K. W. Shi, Effect of the Curing Age on the Chloride Diffusivity of Concrete, China, Zhejiang University of Technology. (2014).