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

Autor(es)

Urrea-Ceferino, Gloria Esther ^[1] ; Rempe, Nolan ^[2] ; dos Santos, Valdemir ^[1] ; Savastano Junior, Holmer ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Res Nucleus Mat Biosyst, Pirassununga, SP - Brazil

^[2] Univ Toronto, Fac Appl Sci & Engn, Toronto, ON - Canada

• Tipo de documento: Artigo Científico
• Fonte: CONSTRUCTION AND BUILDING MATERIALS; v. 152, p. 424-433, OCT 15 2017.
• Citações Web of Science: 4

Resumo

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)

• Processo FAPESP: 13/23810-8 - Estudo de matrizes cimentícias com cinzas agroindustriais e fibras vegetais para fibrocimento
• Beneficiário: Valdemir dos Santos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado