Research Articles

Modeling Hydroionic Transport in Cement-Based Porous Materials Under Drying-Wetting Actions

[+] Author and Article Information
Kefei Li

e-mail: likefei@tsinghua.edu.cn

Chunqiu Li

Research Assistant
e-mail: lcq@mails.tsinghua.edu.cn
Department of Civil Engineering,
Tsinghua University,
Beijing 100084, PRC

1Corresponding author.

Manuscript received August 4, 2011; final manuscript received April 6, 2012; accepted manuscript posted October 25, 2012; published online February 4, 2013. Assoc. Editor: Younane Abousleiman.

J. Appl. Mech 80(2), 020904 (Feb 04, 2013) (9 pages) Paper No: JAM-11-1269; doi: 10.1115/1.4007907 History: Received August 04, 2011; Revised April 06, 2012

This paper investigates the hydroionic transport processes at the near surface of cement-based porous materials under external drying-wetting (D-W) actions. A basic multiphase model is retained and reviewed critically for moisture transport under D-W actions. The multiphase model fails to account for the substantial difference between moisture diffusivities during drying and wetting. The multiphase model is adapted for moisture transport under D-W actions through the respective mechanisms of moisture transport during drying and wetting. Together with the associated ionic transport, a global hydroionic model is established and the corresponding numerical scheme is developed to solve the near surface transport problem. Then, systematic experiments are performed on two concretes with high and low porosities for transport properties and hydroionic transport under D-W actions with pure water and salt solution. Experimental data validate the global model, while some fundamental aspects of hydroionic modeling are discussed.

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Grahic Jump Location
Fig. 1

Regressed moisture diffusivities (up) and deduced diffusivities from the hysteresis effect (down) (“D-”, “W-” for drying and wetting)

Grahic Jump Location
Fig. 2

Sorption isotherm (up) and characteristic curves (down) for CO and CH specimens

Grahic Jump Location
Fig. 3

Moisture loss during drying (up) and gained mass during wetting (down)

Grahic Jump Location
Fig. 4

Schematic of drying-wetting experiment and installation of humidity probes and electrodes

Grahic Jump Location
Fig. 5

Recorded electrical conductivity/humidity (up) and model-predicted humidity (down)

Grahic Jump Location
Fig. 6

Measured/predicted chloride profiles (up) and adapted moisture isotherm (down) for CO specimen

Grahic Jump Location
Fig. 7

Evolution of saturation degree (up) and chloride profile (down) for CO specimen with drying period of 6.5 days and wetting period of 0.5 days



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