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6870794 
Journal Article 
Effect of entrained air voids on the microstructure and mass transport properties of concrete 
Wong, HS; Pappas, AM; Zimmerman, RW; Buenfeld, NR; , 
2011 
Yes 
Cement and Concrete Research
ISSN: 0008-8846 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
1067-1077 
WOS:000294525500008 
The effects of entrained air on microstructure and transport properties of concrete with up to 11.5% air at different w/c ratios, curing and conditioning regimes were investigated. It was found that air voids disrupt the packing of cement and increase the heterogeneity of the microstructure. The width of the affected interface is around 30 mu m. Gaseous diffusivity and permeability are increased by up to a factor of 2-3 at the highest air contents. This effect is similar to that due to increasing w/c ratio from 0.35 to 0.50 when samples are conditioned at 52% r.h or 50 degrees C. The effect on sorptivity is less consistent, while the effect on electrical conductivity is influenced by the moisture condition of the air voids. It is estimated that every 1% increase in air content increases transport by 10% or decreases it by 4%, depending on whether the air voids act as conductors or insulators. (C) 2011 Elsevier Ltd. All rights reserved. 
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