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WEBER, S.; REINHARDT, H. W. Sílica fume concrete with partially lightweight aggregates. In: INTERNATIONAL CONFERENCE ON HIGH- PERFORMANCE CONCRETE, AND PERFORMANCE AND QUALITY OF CONCRTETE 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: 2
Índice h: 1  
Co-autores: Nenhum co-autor encontrado

Abstract

Due to the low water-cement ratio in case of high performance concrete with silica fume a shortage of water during hydration and drying occurs. Because of the very dense structure of the cement paste insufficient water reaches the interior of a concrete member when conventional curing is applied. In order to optimise the hydration of high performance concrete a manipulation of the water content and the microstructure is pro-posed. The main idea consists in introducing into the concrete mixture a certain amount of water saturated lightweight aggregates which become an internal water storage at the dis-posal of the cement paste during hardening and drying. When necessary, the moisture of the lightweight aggregates can be transported by capillary suction and condensation to the ce-ment paste, allowing the hydration process to continue. The newly built hydration products will grow into the existing pores which are partially or completely emptied during drying and hydration and will fill microcracks which might have appeared. The result is a denser structure of the cement paste and thus improved mechanical properties of the concrete. This concrete with an internal water supply achieves a higher performance if when no curing is applied. The theoretical consideration, the optimisation procedure of the mixture and the im-proved properties of the concrete including for partially lightweight aggregates will be shown. The most important results from the macroscopical and microscopical investigations will be presented.
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