Abstract
This work studied 1 cement paste mixture, 4 mortar mixtures with different fine aggregate-cement ratio, 4 concrete mixtures with different water-to-cement ratio, 3 concrete mixtures with different maximum size of coarse aggregate, 4 concrete mixtures incorporating 50% blast furnace slag, and 3 concrete mixtures utilizing 25% fly ash with different air content. All specimens were mainly used for determination of the coefficient of oxygen diffusion. The characteristics of gas transport through various cementitious materials are investigated by determining the coefficient of oxygen diffusion. The pore size distribution and compressive strength experiment are also measured to explain in more detail the gas transport process through the concrete. Test results indicate the coefficient of oxygen diffusion decreases by reducing the W/C, by using mineral admixtures and large maximum size of coarse aggregate, by increasing the weight of aggregate, and aqueous phase in the concrete. The calculated coefficient of oxygen diffusion values on the theory of gas transport through straight capillaries tends to overestimate the experimental results by a factor of 4. However, the analytical result has the same tendency with the experimental result.
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