Oxygen permeability of structural lightweight aggregate concrete

This paper characterizes the oxygen permeability of structural lightweight aggregate concrete (SLWAC). The influence of different parameters is analysed, namely water/binder (w/b) ratio, type of binder and aggregate, relative humidity, water content and concrete age. The correlation between this and other properties is investigated. The oxygen permeability varied over a broad range. Nevertheless, the oxygen permeability of SLWAC with denser aggregates could be as low as that of normal weight concrete. The influence of the type of aggregate tended to increase with w/b ratio, aggregate porosity and percentage of additions. Small differences between mixtures were masked by the high variability of the test.