Propriedades mecânicas de materiais compósitos à base de cimento Portland e resina epoxi

Abstract

ResumoO estudo de materiais de alto desempenho e multifuncionais, como os compósitos poliméricos cimentícios, tem sido o foco de inúmeras pesquisas na indústria da construção civil. Este trabalho investiga o efeito da combinação de uma fase polimérica termorrígida, uma resina epóxi, com cimento Portland branco estrutural, seguido da avaliação da resistência à compressão e módulo de elasticidade. Este compósito, quando comparado individualmente com as suas matérias-prima originais, promove um aumento da resistência mecânica à compressão, redução da massa específica e, também uma mudança significativa do comportamento mecânico. As mudanças nas propriedades mecânicas estão associadas à hidratação da fase cimentícia na presença da resina, fato comprovado através da análise espectroscópica na região do infravermelho. Palavras-chave: compósito cimentício polimérico, resina epóxi, cimento Portland branco, espectroscopia por infravermelho. AbstractThe study of multi-functional materials of high performance, as the polymeric-cementitious composites, has been the focus of several researches in the industry of the civil engineering. This work investigates the effect of the combination of a thermorigid epoxy phase and the white Portland cement, followed by the evaluation of its compressive strength and modulus of elasticity. This composite, when the phases are individually compared, provides an increase of the compressive strength, a reduction of the density, and a significant change of the mechanical behaviour. The changes in mechanical behaviour are associated with the hydration of cement in the presence of resin, which was evident after infrared spectroscopy analysis.

Epoxy resin‐cement paste composite for wellbores: Evaluation of chemical degradation fostered carbon dioxide

“…Therefore, the amount of hydration products, the hydrate crystals morphology and the microstructure of cement paste are modified. It is related to the partial intercalation of the polymer chains within the cement hydration products and interactions obtained by hydrogen bonds between the resin and these products ,. Moreover, bulk density of cement tends to decrease by increasing epoxy resin content according to the mixing rule of the present phases (polymer and cement) .…”

Timber Beam Repair Based on Polymer-Cementitious Blends

“…2017 367 The use of particulate composites as reinforcement for timber beams has also been investigated in the literature. BRAZ et al (2013) have reported the use of a polymer-ceramic blend (PANZERA et al, 2010) to repair the compressive zone of timber beams. The finite element analysis (FEA) has pointed out the polymer-cementitious blend as an alternative solution for reinforcement of timber beams, presenting excellent strength and stiffness properties in compression.…”

“…A thermoset polymer phase has also been added to enhance the mechanical properties of cementitious composites. PANZERA et al (2010) have evaluated the effect of the epoxy polymer combined with the white Portland cement. The incorporation of 50wt% (weight fraction-wt%) of epoxy polymer into a Portland cement paste resulted in superior mechanical properties compared to the reference condition.…”

“…A similar research has been carried out on the use of particulate composites and blends for timber repairing proposal. Based on the previous research performed by PANZERA et al (2010), this study evaluates the physical and mechanical properties of a polymer-cementitious blend manufactured with epoxy polymer and Ordinary Portland Cement (OPC) in order to repair or to reinforce timber beams. A powder pigment was added to the mixture to attain similar aesthetic characteristics of wood beam surface.…”

Full factorial design analysis of carbon nanotube polymer-cement composites

“…The results revealed that the presence of the polymeric phase leads to an increase of strength and a reduction of the bulk density, compared to pure cement. Based on FTIR analysis it was observed that the formation of hydrated cement grains can occur due to the presence of epoxy resin 10 . Panzera et al 11 also investigated the effect of adding thermoset polymer (25, 50 and 75 wt.…”