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Influence of Type of Cement and Curing on Carbonation Progress and Pore Structure of Hydrated Cement Pastes

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Abstract

Different series of cement paste specimens were prepared with ordinary Portland cement, with portland, blast furnace slag cements having slag contents of 30, 50 and 75% by mass, with commercial fly ash cement and with portland cement containing fly ash additions of 10, 20, 30 and 50% by mass. Moist curing of the specimens varied between 3 and 28 days before the pore size distribution and characteristics of the phase composition were analyzed. Subsequent to curing, the specimens were subjected to drying in air of 65% RH with a controlled CO2 content of 0, 0.03 and 2% CO2 by volume. Depth of carbonation, pore size distribution of the carbonated paste, and the phase composition were investigated after 28 days and 6 months of drying, respectively. The results show that carbonation alters the prevailing pore structure of the hydrated paste. Important parameters are the type of cement used and the duration of curing.

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Bier, T.H.A. Influence of Type of Cement and Curing on Carbonation Progress and Pore Structure of Hydrated Cement Pastes. MRS Online Proceedings Library 85, 123 (1986). https://doi.org/10.1557/PROC-85-123

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  • DOI: https://doi.org/10.1557/PROC-85-123

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