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LEVY, S. M.; HELENE, P. R. L. Durability of concrete produced with mineral waste of civil construction industry. In: CIB SYMPOSIUM ON CONSTRUCTION E ENVIRONMENT: THEORY INTO PRACTICE, 2000, São Paulo. Anais… São Paulo, 2000.
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Abstract

The data in this paper are part of a doctoral thesis which aims at studying the durability of the concrete produced from mineral wastes deriving from concrete and masonry. From the vast study developed in the thesis, only the results of three families of concrete have been analyzed: one for reference, and produced exclusively from natural aggregates, and the other two containing 50% of natural aggregates and 50% of recycled aggregates, measured by weight, being some of masonry and some of concrete. For the mix proportions produced, 1:3, 1:4.5 and 1:6, the fixed consistency was 70 ± 20 mm. The evolution of the mechanical strength at the ages of 28, 91 and 182 days, as well as the absorption by immersion, the void ratio, resistivity and depth of carbonation for the three families of concrete have been analyzed. The results showed no differences in mechanical resistance when the natural aggregates were replaced by recycled aggregates, and a reduction of 20% to 30% when aggregates from masonry were used. Absorption by immersion and void ratio showed a strong influence exerted by the choice of the aggregate, which did not occur to the advance of the carbonation front and the resistivity, which are far more dependent on the mix proportions. Under the conditions of the experiment, it can be concluded that the aggregates recycled from concrete did not show limitations in terms of mechanical strength or durability, which was not the case when aggregates recycled from masonry were used.
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