Influence of the Pretreatment on the Concrete Chloride Diffusion Coefficient

Abstract:

The pretreatment of concrete rapid chloride migration coefficient (RCM) method in different standard is different in China. However the influence of pretreatment on the experimental result is uncertain, which leads to poor comparability about the results between different standards and trouble in evaluating the durability of concrete structures. The influence of the pretreatment on the chloride diffusion coefficient was studied by contrastive method. On the base of the results a suitable pretreatment of RCM method was proposed. The results are as followings: (1) the influence of pretreatment on the chloride migration coefficient of concrete with 0.45 W/B is insignificant. The influence of pretreatment on the chloride migration coefficient of concrete with other W/B is significant, and the influence increase with the lower w/b.; (2) the chloride diffusion coefficient will increase after the ultrasonic bath and vacuum saturation, and the influence of the ultrasonic bath is larger. Considering the judgment to the durability of structure, the ultrasonic bath and the vacuum saturation are suggested to be used; (3) on the condition of the same anode and cathode solution, the chloride diffusion coefficient in accordance with JTG / T B07-01-2006 standard is usually higher than that in accordance with GB/T50082-2009 standard; (4) the relationship of the chloride diffusion coefficient between mortar and concrete specimens is uncertain under different proportion and curing system, so the mortar specimens can not replace the concrete specimens for the RCM method.

• Periodical: Key Engineering Materials (Volume 477)
• Pages: 382-387
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.477.382
• Online since: April 2011
• Authors: Jia Cheng Li, Wen Ying Guo, Jing Wei Wu, Yi Bo Yang
• Keywords: Chloride Ion, Concrete, Mortar, RCM Method, Ultrasonic Bath, Vacuum Saturation

References

[1] Changsha university of technology, Tsinghua university: JTG/T B07-01-2006 Specification for deterioration prevention of highway concrete structures [S]. Beijing: China Communication Press (in Chinese).

[2] Chinese architecture academy of science: GB/T50082-2009 Standard for test method of long-term performance and durability of ordinary concrete[S] Beijing: China Architecture & Building Press (in Chinese).

[3] Yang Yi-bo, Liang Song, Mo Hai-hong, Chen You-wen. Discussion of the test method of the resistance to chloride ion penetration of concrete [J]. Chinese harbor, 2007, 46-47 (in Chinese).

[4] Si Cai-jun, De-Hua Deng, Xieyou Jun. Concrete pore structure and chloride ion penetration mechanism [A]. See: Si Cai-jun was the Editor-in-chief . International Conference on Ecological environment and concrete technology [C]. Urumuqi: 2005: 224-228 About the author: Li Jia-cheng (1987 -), male, undergraduate, Civil Engineering, South China University of Technology School of Civil Engineering and Transportation, Post Code: 510640. Corresponding author: Guo Wen-ying, Wushan, Tianhe District, Guangzhou, South China University of Technology Department of Civil Engineering (510640); Tel / Fax : [phone]; Mobile: [phone]; Email: wyguo@scut. edu. cn.

DOI: 10.25165/j.ijabe.20191203.4358