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

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

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Author(s):
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]
Total Authors: 8
Affiliation:
[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
Total Affiliations: 8
Document type: Journal article
Source: Cerâmica; v. 69, n. 392, p. 312-317, 2024-04-22.
Abstract

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)

FAPESP's process: 14/50948-3 - INCT 2014: advanced eco-efficient technologies in cementitious products
Grantee:Vanderley Moacyr John
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 22/07179-5 - Durability evaluation of MOS matrix fiber cement reinforced with lignocellulosic fibers and submitted to accelerated carbonation process
Grantee:Adriano Galvão de Souza Azevedo
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 21/04780-7 - Study of durability on cementitious composites reinforced with lignocellulosic fibers with MgO and MgSO4 matrices
Grantee:Adriano Galvão de Souza Azevedo
Support Opportunities: Scholarships in Brazil - Post-Doctoral