Os compósitos cimentícios, especialmente os de ultra alto desempenho, são materiais de grande resistência mecânica que têm em sua composição materiais cimentícios suplementares com a finalidade de diminuir o impacto ambiental provocado pela produção do cimento Portland. O pó de vidro pode ser considerado um material cimentício suplementar devido à sua composição rica em sílica amorfa e, pode ser amplamente utilizado como substituição parcial do cimento Portland no concreto. Assim, o objetivo deste trabalho é avaliar a influência da substituição do cimento Portland por diferentes teores de pó de vidro no comportamento físico e mecânico de um compósito cimentício elaborado para ser utilizado no reparo de estruturas de concreto armado, proporcionando uma opção de destinação adequada para o resíduo de vidro. Para tanto, foram produzidos compósitos cimentícios com consumo de cimento de 1000 kg/m³ com a substituição de 10%, 20%, 30% e 50% em volume do cimento por pó de vidro finamente moído (<75μm). Foram avaliados a massa específica e teor de ar incorporado no estado fresco, resistência à compressão simples, resistência à tração por compressão diametral, módulo de elasticidade dinâmico e absorção de água. As propriedades mecânicas foram determinadas e comparadas com a composição de referência, sem utilização de vidro moído. Os resultados demonstram que o uso do pó de vidro em substituição ao cimento Portland não altera significativamente as propriedades analisadas na idade de 28 dias. Palavras-chave: Compósito cimentício, ultra alto desempenho, pó de vidro Abstract: Cementitious composites, especially those of ultra-high performance, are high mechanical strength materials composed of supplementary cementitious materials in order to reduce the environmental impact caused by the production of Portland cement. Glass powder may be considered a supplementary cementitious material due to its composition rich in amorphous silica, and this material can be used as a partial substitution of Portland cement in concrete. Therefore, this work aims to assess the influence of partial substitution of Portland cement by different contents of glass powder on a cementitious composite designed to be used in reinforced concrete structures repair, providing a suitable destination for glass waste. In this work cementitious composites produced with cement content of 1000 kg/m³, with substitutions of 10%, 20%, 30% and 50 % by volume of finely ground glass (<75μm). Was evaluated the specific gravity and air content in fresh state, axial compression strength tensile splitting strength dynamic elasticity modulus, and water absorption of the mechanical properties were evaluated and compared with reference mix without using ground glass. The results indicate the use of glass powder as substitution of Portland cement does not significantly affect the properties analyzed at 28 days.
Novel developments on concrete technology such as high and ultra-high-performance concrete (HPC and UHPC) are notorious by its high consumption of Portland cement. Supplementary cementitious materials have been used as partial replacement of Portland cement aiming to minimizing clinker content, optimizing the use of binders, reducing CO2 emissions, and increasing durability. Waste glass powder could be an alternative due to its silica-rich nature and wide availability. This work aims to assess the influence Portland cement substitution by finely ground waste glass powder in contents of 10%, 20%, 30% and 50% on physical and mechanical behavior of ultra-high-performance cementitious composites (UHPCC). Results indicates the use of glass powder as substitution up to 50% of Portland cement does not significantly affect the analyzed properties at 28 days.
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