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Influence of Pore Structure on Chloride Distribution in Surface Layer of Cement Paste under Cyclic Wet-Dry Condition

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Abstract:

This research focuses on influence of pore structure on chloride distribution in surface layer of cement paste under cyclic wet-dry condition. The results of chloride distribution reveal that drying and wetting cycles can lead to a peak value of chloride content (Cmax) occurring in surface layer of cement paste. Cmax increases with the increase of W/C. While the depth (Δx) at which Cmax appears does not show a regular change. Moreover, Cmax should be used to predict service life of concrete structures when Cmax appears in the chloride profiles. For the influence of pore structure, there exists an obvious hyperbolic relationship between chloride diffusion coefficient (D), Cmax and pore structure parameters. D and Cmax increase with total porosity and the most probable pore diameter, decrease with tortuosity, and stabilize gradually. And the most probable pore diameter has the most significant impact on D and Cmax. In addition, XRD and SEM-EDS results indicate that the deposition of Friedel’s salt results in the formation of more inkbottle shaped pores, which may cause the appearance of Cmax under cyclic drying-wetting conditions due to hysteretic moisture effect.

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Periodical:

Applied Mechanics and Materials (Volume 875)

Pages:

165-173

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.875.165

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Online since:

January 2018

Authors:

Hong Lei Chang*, Song Mu, Ya Ya Du, Li Yang

Keywords:

Dry-Wet, Friedel’s Salt, Paste, Peak Value of Chloride Content, Pore Structure

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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