Absorption Characteristics of Cement Combination Concrete Containing Portland Cement, fly ash, and Metakaolin
Abstract: The resistance to
water penetration of cement combination concretes containing Portland cement
(PC), fly ash (FA), and metakaolin (MK) have been investigated at different
water/cement (w/c) ratios, 28-day strengths, and depths of water penetration
using their material costs and embodied carbon-dioxide (eCO2) contents. Results
revealed that, at equal w/c ratio, eCO2 content reduced with increasing content
of FA and MK. MK contributed to the 28-day strengths more than FA. Compared
with PC, FA reduced cost and increased the depth of water penetration, MK
increased cost and reduced the depth of water penetration, and their ternary
combinations become beneficial. At equal strengths and levels of resistance to
water penetration, most of the cement combination concretes are more
environmentally compatible and costlier than PC concrete. Only MK binary cement
concretes with 10%MK content or more and ternary cement concretes at a total
replacement level of 55% with 10%MK content or more have higher resistance to
water penetration than PC concrete.
Author: Folagbade S.O
Journal Code: jptsipilgg160008
