Assessment of the physical-mechanical performance of magnesium oxide-based fiber cement submitted toaccelerated carbonation

Autor(es)

A. G. S. Azevedo ^[1] ; T. O. G. Freitas ^[2] ; J. C. A. Molano ^[3] ; H. R. Trevisan ^[4] ; I. M. S. Parente ^[5] ; P. Faria ^[6] ; A. Camões ^[7] ; H. Savastano ^[8]

Afiliação do(s) autor(es)

^[1] University of São Paulo. Department of Biosystems Engineering - Brasil

^[2] University of São Paulo. Department of Biosystems Engineering - Brasil

^[3] University of São Paulo. Department of Biosystems Engineering - Brasil

^[4] University of São Paulo. Department of Biosystems Engineering - Brasil

^[5] University of São Paulo. Department of Biosystems Engineering - Brasil

^[6] NOVA University Lisbon. NOVA School of Science and Technology. Department of Civil Engineering - Portugal

^[7] NOVA University Lisbon. NOVA School of Science and Technology. Department of Civil Engineering - Portugal

^[8] University of São Paulo. Department of Biosystems Engineering - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Cerâmica; v. 69, n. 392, p. 312-317, 2024-04-22.

Resumo

Abstract In the pursuit of unconventional binders that can reduce energy consumption in production, magnesium oxysulfate (MOS) cement emerges as a viable alternative. Moreover, carbon dioxide (CO2) has been employed in the curing process of certain MOS cement products, such as magnesia fiber cement, due to its capacity to enhance their performance. This study aims to assess the impact of pre-curing prior to accelerated carbonation on the physical-mechanical properties of magnesium oxide fiber cement boards. These boards were manufactured using the Hatschek process simulation and subjected to pre-curing periods of 24, 48, and 72 h post-production. The relationship between microstructural alterations and the physical-mechanical properties was examined through analyses including water absorption, apparent porosity, apparent density, four-point bending tests, X-ray diffraction, and scanning electron microscopy analyses. The results indicated that pre-curing had an influence on the physical-mechanical attributes of the manufactured boards. After 72 h, the carbonated materials exhibited a decline in mechanical performance, a phenomenon attributed to the carbonation reactions between CO2 and the hydration products responsible for enhancing the mechanical strength of the cementitious materials. (AU)

• Processo FAPESP: 21/04780-7 - Estudo da durabilidade em compósitos cimentícios reforçados com fibras lignocelulósicas com matrizes com MgO e MgSO4
• Beneficiário: Adriano Galvão de Souza Azevedo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 14/50948-3 - INCT 2014: tecnologias ecoeficientes avançadas em produtos cimentícios
• Beneficiário: Vanderley Moacyr John
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 22/07179-5 - Avaliação da durabilidade de fibrocimentos de matriz MOS reforçados com fibras lignocelulósicas e submetidos à processos de carbonatação acelerada
• Beneficiário: Adriano Galvão de Souza Azevedo
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado