Influence of different conditioning regimes on the oxygen diffusion and oxygen permeability of concrete

Author(s): C. Peretti, A. Leemann, R. Loser, P. Lura
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 1173 - 1181
Total Pages: 8
Language: English

Abstract: 
Penetration of gases and solutions into concrete can cause damage to the cement paste matrix and additionally induce steel corrosion. As transport properties are critically dependent on the moisture state of the concrete and on possible damage of the microstructure (e.g. cracks), proper conditioning is needed to bring concrete from different sources to comparable conditions before testing. However, the effect of conditioning of the samples prior to transport testing is poorly known.

In this paper, the influence of three different conditionings (harsh, intermediate and gentle) on the oxygen diffusion and oxygen permeability of Portland cement concrete (w/c 0.40, 0.50 and 0.65) is studied, in order to help creating a standard procedure to investigate transport phenomena.

All transport coefficients increased linearly with w/c. Oxygen diffusion was related to the moisture-free porosity volume fraction with an exponential correlation. The scatter in the permeability measurements was higher compared to diffusion, while the influence of dryingshrinkage cracks on transport appeared to be negligible. Based on the results of this research, a possible conditioning standardization for transport testing is proposed.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00