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.
J. Liu et al., "Study on Surface Permeability of Concrete under Immersion," Materials, vol. 7, no. 2, pp. 876-886, MDPI AG, Jan 2014.
The definitive version is available at https://doi.org/10.3390/ma7020876
Civil, Architectural and Environmental Engineering
Keywords and Phrases
Calcium hydroxide; Concrete; Immersion; Pore structure; Surface permeability
International Standard Serial Number (ISSN)
Article - Journal
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01 Jan 2014