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ZOUAGHI, A.; NAKAZAWA, T. Influence of mixture proportions upon very high air void content concrete properties. 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)
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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

In recent years, there has been a growing interest in the use of Very High Air Void Content Concrete (VHAVCC) as an ecological material (Environmentally friendly concrete). Expanding production has encouraged researchers to examine the internal structure of VHAVCC and its influence upon certain physical and mechanical properties of VHAVCC and to develop pertinent design methodologies compatible with the environment conditions, materials availability, and construction procedures. The present study details the properties of VHAVCC that satisfy permeability and strength requirements. It investigates the relationships between air void content, aggregate types, gradation, shape, bound limit and permeability requirements. Evaluation of the effects of VHAVCC's components on its strength and elastic modulus was also performed. The study was extended to the effects of portland cement substitution by silica fume and compaction degree. Available crushed limestone, pumice and scoria were used as coarse aggregates to produce VHAVCC. The basic aggregate-cement ratios by volume were 6, 8 and 12. Sets of curves showing the effects of the above enumerated factors were constructed. They clearly show that: (a) factors such as age, mixture proportions and aggregate types influence the strength and elastic modulus of the VHAVCC; (b) VHAVCC has higher modulus of rupture than ordinary concrete; (c) silica fume does not significantly increase the strength of VHAVCC; and (d) aggregate gradation, bound limit, shape, and binder content as well as compaction degree influence the permeability significantly.
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