Avaliação da microfibra de resíduo de lã de vidro como reforço alternativo para compósitos de fibrocimento com polpa celulósica de pinus

Abstract

Fiber cement is widely used in the world, however, with the ban on the use of asbestos, it becomes necessary to seek new alternatives. In this scenario, the reuse of glass wool residue (RLV) appears as a promising option. Currently, significant amounts of this waste are produced and often discarded in landfills, causing long-term environmental damage. Thus, the main objective of this work is to evaluate the use of RLV in matrices based on Portland cement reinforced with cellulose pulp of Pine (PCP). The process included the processing of RLV and Kraft Pinus leaves, being submitted to physical, chemical, mineralogical and morphological characterization. The fiber cement composites were made using CPV-ARI Portland cement, limestone filler, long pine fibers and RLV. The incorporation of RLV was carried out in different proportions, including a reference condition (0%) and variations of 1%, 2%, 6%, 8% and 25%, in relation to the total mass of the composite. The manufacturing processes of the composites occurred through the Hatschek simulation method, followed by curing for periods of 7, 28 and 90 days. Subsequently, the composites were subjected to physical and mechanical analysis. Furthermore, the cement pastes were produced following the same proportion used for the composites, being submitted to microstructural analysis, conducted through chemical, mineralogical and morphological analyses. Through the analyzes carried out, it was possible to observe that the use of RLV in the cementitious matrix provided a better fiber/matrix ratio, results obtained through the SEM, which contributed to the improvement of the mechanical performance in the flexural tensile strength (MOR) of the composites (with values of up to 58% increase), increment related to changes in the porosity of the composite and the formation of a denser and less porous matrix. Chemical analysis showed that RLV is mainly composed of silica, aluminum, calcium and iron and has an amorphous structure, characteristics that suggest its potential as a pozzolan. These results demonstrate the potential of RLV as an alternative raw material in the production of composites, generating environmental benefits and reducing the need for disposal in landfills.