Experimental and Analytical Studies on Oxygen Transport in Various Cementitious Materials

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Title: Experimental and Analytical Studies on Oxygen Transport in Various Cementitious Materials

Author(s): A. S. Sudjono and H. Seki

Publication: Special Publication

Volume: 192

Issue:

Appears on pages(s): 721-738

Keywords: blast furnace slag; capillary; diffusion; fly ash; mineral admixtures; pore size distribution; water content

Date: 4/1/2000

Abstract:
The following materials were studied in this work: one cement paste mixture, four mortar mixtures with diriment fine aggregate-cement ratio, for concrete mixtures with different water-to-cement ratio, three concrete mixtures with different maximum size of coarse aggregate, four concrete mixtures incorporating 50% blastfurnace slag, and three concrete mixtures incorporating 25% fly ash with different air content. All specimens were mainly used for determination of the coefficient of oxygen diffusion. The characteristic of gas transport through various cementitious materials is investigated by determining the coefficient of oxygen diffusion. The pore size distribution and compressive strength experiment are also measured to explain in more details the gas transport process through the concrete. The test results in this study indicate that the coefficient of oxygen diffusion values based on the theory of gas transport thought straight capillaries tends to overestimate the experimental results by a factor of four. However, the analytical result has the same tendency with the experimental result.