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DONZA, H.; GONZÁLEZ, M.; CABRERA, O. Influence of fine aggregate mineralogy on mechanical properties of high-strength concrete. In: INTERNATIONAL CONFERENCE ON HIGH- PERFORMANCE CONCRETE, AND PERFORMANCE AND QUALITY OF CONCRETE STRUCTURES, 2., 1999, Gramado. Anais… Gramado, 1999.
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Número de Trabalhos: 2 (Com arquivo PDF disponíveis: 1)
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Dados do autor na base InfoHab:
Número de Trabalhos: 2 (Nenhum com arquivo PDF disponível)
Citações: Nenhuma citação encontrada
Índice h: Indice h não calculado  
Co-autores: Nenhum co-autor encontrado

Dados do autor na base InfoHab:
Número de Trabalhos: 2 (Com arquivo PDF disponíveis: 1)
Citações: Nenhuma citação encontrada
Índice h: Indice h não calculado  
Co-autores: Nenhum co-autor encontrado

Abstract

During last decades, high-performance concrete has suffered an important development due to the requirements in design and construction practice of concrete structures. In terms of concrete materials, the investigations have been focused to know the influence of different type of cements, the kind and proportions of mineral admixtures, the type of superplasticizer and the mineralogical composition of coarse aggregates. However, rounded and smooth grains sand has been widely used in this research. In the center of Buenos Aires State, crushed sands from diverse sources are commonly used in concrete production. These fine aggregates are considered as marginal aggregates for standard due to the high volume of paste required to making workable concrete. But this is not an obstacle in high-strength concrete since high paste volume is always required to attain the specified strength. In this paper, the effect of different crushed sand (granite, limestone and dolomite) on fresh and hardened concrete properties is analyzed. High early strength portland cement without mineral admixtures and very low W/C (0.30 to 0.36) were used. Results show that crushed sand requires an increase of superplasticizer dosage to obtain high workable concrete, without detrimental effects on the strength development at later ages (70 MPa at 90 days).
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