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Durability evaluation of MOS matrix fiber cement reinforced with lignocellulosic fibers and submitted to accelerated carbonation process

Grant number: 22/07179-5
Support Opportunities:Scholarships abroad - Research Internship - Post-doctor
Effective date (Start): September 01, 2022
Effective date (End): February 24, 2023
Field of knowledge:Engineering - Civil Engineering - Construction Industry
Principal Investigator:Holmer Savastano Junior
Grantee:Adriano Galvão de Souza Azevedo
Supervisor: Maria Paulina Santos Forte de Faria Rodrigues
Host Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil
Research place: Universidade Nova de Lisboa, Portugal  
Associated to the scholarship:21/04780-7 - Study of durability on cementitious composites reinforced with lignocellulosic fibers with MgO and MgSO4 matrices, BP.PD

Abstract

The aim of the activities is the development and formulation of a hydraulic cementitious matrix with a clinker-free chemical composition and incorporated aggregates, together with microscopic fibers. The innovation in this work follows the principle of producing fiber cements with lignocellulosic fibers of plant origin, given their physicochemical characteristics, which allows economic advantages over other types of fibers. Obtaining a stable matrix based on MgO and MgSO4 that allows the insertion of biomass as reinforcement without fiber degradation and promotes CO2 capture through accelerated carbonation reactions. To investigate the influence of fiber in the composites and to evaluate the durability of fiber cements through accelerated aging processes in order to understand the behavior of these materials when exposed to weathering. Characterize the material through mechanical, physical, and chemical properties, before and after the carbonation and accelerated aging processes. Identify and quantify the crystalline phases of the chemical compounds formed during hardening through structural refinement by the Rietveld method and the application of spectroscopic techniques to follow the formation reactions of the phases responsible for the strength gain of the MOS cement. To study the changes in the matrix structure produced by carbonation and to promote an understanding of the transition zone between the matrix and the fiber in order to improve the adhesion and the performance of the composite. To analyze the microstructure of the material after carbonation and accelerated aging and establish a relationship with important properties in cementitious materials, such as porosity and permeability. By employing the techniques of quantification of captured CO2, the results can be used in the Life Cycle Analysis of (LCA) fiber cement. (AU)

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