Resumo Novos desenvolvimentos na tecnologia do concreto, como concretos de alto e ultra-alto desempenho (CAD e UHPC) são notórios não apenas pela elevada resistência mecânica e durabilidade, como também pelo alto consumo de cimento Portland. Materiais cimentícios suplementares têm sido utilizados como substitutos parciais do cimento Portland visando minimizar o consumo de clínquer, otimizando o uso de aglomerantes, reduzindo as emissões de CO2 e aumentando a durabilidade. O pó de vidro residual pode ser uma alternativa viável devido à sua natureza rica em sílica, ampla disponibilidade e baixo custo. Este trabalho tem como objetivo avaliar a influência da substituição do cimento Portland por pó de vidro residual finamente moído em teores de 10%, 20%, 30% e 50% no comportamento físico e mecânico de compósitos cimentícios de ultra alto desempenho (UHPC). Os resultados indicam que o uso de pó de vidro como substituição de até 50% do cimento Portland não afeta significativamente as propriedades analisadas aos 28 dias.

Abstract 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.

Abstract The addition of pozzolans has a potentially important role in the cement industry since using waste from other industries has important environmental benefits, including reduced CO2 emissions from cement production. This study evaluates the pozzolanic activity of the glass powder in three different particle sizes (150 µm, 75 µm, and 45 µm, upper limits) and compares the results with those of other added pozzolans and technical standards found in the literature. Pozzolanicity was determined by four methods: Pozzolanic Activity Index (PAI) with lime, Performance Index (PI) with Portland cement, electric conductivity, and modified Chapelle. The results of the Chapelle and electrical conductivity trials indicated the pozzolanic activity of glass powder in all three particle sizes studied. The results of PAI with lime revealed pozzolanic activity of the 45 µm fraction while the performance index with cement showed the pozzolanicity of the 75 µm and 45 µm fractions according to ASTM C 618-05 (2005). It is concluded that the smallest glass fractions provided better reaction rates due to larger contact surfaces and are, therefore, considered pozzolans.