期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 152, 期 -, 页码 424-433出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2017.06.182
关键词
Cementitious matrixes; Curing process; Unbleached pulp; Bleached pulp; Mechanical behavior; Microstructure
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior [33002010239P2]
- University of Toronto's Division of Engineering Science
- Faculty of Forestry
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo FAPESP [2013/23810-8, 2012/514673]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [150384/2016-5]
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.
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