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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Urrea-Ceferino, Gloria Esther [1] ; Rempe, Nolan [2] ; dos Santos, Valdemir [1] ; Savastano Junior, Holmer [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Res Nucleus Mat Biosyst, Pirassununga, SP - Brazil
[2] Univ Toronto, Fac Appl Sci & Engn, Toronto, ON - Canada
Total Affiliations: 2
Document type: Journal article
Source: CONSTRUCTION AND BUILDING MATERIALS; v. 152, p. 424-433, OCT 15 2017.
Web of Science Citations: 4
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 CO2), 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. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 13/23810-8 - Study of cementitious matrices with agroindustrial ashes and vegetable fibers for fibre-cement
Grantee:Valdemir dos Santos
Support Opportunities: Scholarships in Brazil - Post-Doctoral