Definition of optimal parameters for supercritical carbonation treatment of vegetable fiber-cement composites at a very early age

Published on Oct 15, 2017in Construction and Building Materials4.419
· DOI :10.1016/J.CONBUILDMAT.2017.06.182
Gloria Esther Urrea-Ceferino2
Estimated H-index: 2
(USP: University of São Paulo),
Nolan Rempe2
Estimated H-index: 2
(U of T: University of Toronto)
+ 1 AuthorsHolmer Savastano Júnior18
Estimated H-index: 18
(USP: University of São Paulo)
Sources
Abstract
Abstract This paper presents a study of cellulose pulp fiber-cement composites subjected to supercritical carbonation at a very early age. The raw materials used for the creation of cementitious composite mixes include: Portland cement, limestone filler, and cellulose pulp. Composites were produced by a slurry vacuum dewatering process and subjected to curing conditions which studied the effect of supercritical carbonation concentration (0% and close to 100% of CO 2 ), the effect of cellulosic pulp (unbleached or bleached), and durability. All samples were subjected to mechanical, physical, and microstructural tests. The initial period of thermal curing (varying from 24 h to 48 h) and exposure time to carbonation (from 1 h to 2 h), did not have a statistically significant effect on the mechanical performance of the composites. However, the flexural test results of carbonated composites reinforced with bleached pulp showed a statistically significant improvement when compared to unbleached pulp reinforcement (24% increased average modulus of rupture). Thus, for cementitious composites cured with supercritical carbonation, the use of bleached cellulosic pulp, 24 h of thermal hydration and 1 h in an environmental chamber provided the optimal curing conditions and the most desirable properties in this study.
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