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TOBORI, N.; HOSODA, T.; KASAMI, H. Properties of superplasticized concrete containing recycled fine aggregate. 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: 1 (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: 1 (Nenhum com arquivo PDF disponível)
Citações: Nenhuma citação encontrada
Índice h: Indice h não calculado  
Co-autores: Nenhum co-autor encontrado

Abstract

For improvement of workability and hardened properties of concrete containing recycled aggregates, application of superplasticized concrete for recycled aggregates concrete was investigated. Fresh and hardened properties of superplasticized concrete containing recycled coarse and fine aggregates were compared with that of natural aggregates concrete. The superplasticized concrete containing recycled fine aggregate can be produced with satisfactory slump, air content, bleeding and setting time. The superplasticizing effect on the concrete containing recycled coarse aggregates was nearly equal to the natural aggregates system. However, for the concrete made with all recycled aggregates, the superplasticizing effect decreased remarkably. It was found that the superplasticizing effect depended on the cement paste from original concrete that was present as isolated flocs and adhered to the surface of recycled aggregates. For the superplasticized concrete with recycled fine aggregates, the amount of bleeding and setting time were lower than the natural aggregates concrete, although it required a higher dosage of the superplasticizer. Notwithstanding a higher dosage of superplasticizer, the hardened properties, compressive strength, drying shrinkage and resistance to freezing and thawing cycling of base concrete and superplasticized concrete with recycled fine aggregates were comparable. Furthermore, it was found that the drying shrinkage of superplasticized concrete was lower than that of the corresponding control concrete.
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