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Open AccessArticle

Study on Surface Permeability of Concrete under Immersion

by Jun Liu 1, Feng Xing 1,*, Biqin Dong 1, Hongyan Ma 2,* and Dong Pan 1
Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China
Department of Civil and Environmental Engineering, the Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
Authors to whom correspondence should be addressed.
Materials 2014, 7(2), 876-886;
Received: 12 December 2013 / Revised: 16 January 2014 / Accepted: 23 January 2014 / Published: 28 January 2014
(This article belongs to the Section Porous Materials)
In this paper, concrete specimens are immersed in ultrapure water, to study the evolutions of surface permeability, pore structure and paste microstructure following the prolonging of immersion period. According to the results, after 30-day immersion, the surface permeability of concrete becomes higher as compared with the value before immersion. However, further immersion makes the surface permeability decrease, so that the value measured after 150-day immersion is only half that measured after 30-day immersion. The early increase in surface permeability should be mainly attributed to the leaching of calcium hydroxide, while the later decrease to the refinement of pore structure due to hydration. The two effects work simultaneously and compete throughout the immersion period. The proposed mechanisms get support from microscopic measurements and observations. View Full-Text
Keywords: concrete; immersion; calcium hydroxide; surface permeability; pore structure concrete; immersion; calcium hydroxide; surface permeability; pore structure
MDPI and ACS Style

Liu, J.; Xing, F.; Dong, B.; Ma, H.; Pan, D. Study on Surface Permeability of Concrete under Immersion. Materials 2014, 7, 876-886.

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