MICROMECHANICS MODELING THE SOLUTE DIFFUSION IN UNSATURATED HARDENED CEMENT PASTE

Author(s): Rongwei Yang, Eric Lemarchand, Teddy Fen-Chong, Kefei Li
Book Title: RILEM International Symposium on Concrete Modelling - CONMOD 2014
Editor: Kefei Li, Peiyu Yan and Rongwei Yang
ISBN: 978-2-35158-139-1
e-ISBN: 978-2-35158-140-7
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 374-385
Total Pages: 12
Language: English

Abstract: Based on the characterization of microstructure morphology and local physical properties, a micromechanics model is proposed to estimate the solute diffusion coefficient of the unsaturated hardened cement paste. The water films adsorbed on the gas-pore wall interface as well as the connectivity of the capillary pore water are accounted for in the micromechanics model. It is shown that the evolution of solute diffusion coefficient exhibits notable nonlinear decrease with saturation degree. At high saturation degree (Sr  80%), the drastic decrease of the solute diffusion with decreasing saturation degree is due to the draining of the capillary pore water.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00