Mercedes Perez Mendez - Study of the strength developed by stable carbonated phases  in high alumina cement

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          Cement and Concrete Research,     14, 161-169 (1984). 


        The direct hydration of high alumina cement to the cubic phase,   C3AH6,   at temperatures above 30°C is proposed to avoid the conversion   from CAH10 to   C3AH6.   The carbonation of C3AH6 with   CO2 between   20°C and 90°C causes an increase in strength which is higher at   higher temperatures. It is caused by the presence of   thermodynamically stable carbonated phases. The optimum hydration   times are the minimum necessary to get C3AH6:   3 hours at 80°C and 6 hours at 60°C. Subsequent carbonation up to   a total time of 24 hours after the end of mixing provides 80% of   the strength obtained after 28 days of hydration at the same   temperature, with the same compounds being formed. If   CaCO3 is   added to the cement before mixing, the strengths are even higher   than for specimens without it. The effect of a   super-water-reducing admixture on strength has also been   studied.

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