Study of incorporation of wasted foundry sand and construction and demolition wastes in manufacture of structural concrete blocks

Reference Presenter Authors
(Institution)
Abstract
06-047 Ana Luisa Rizzatti da Costa da Costa, A.R.(Universidade do Estado de Santa Catarina); Dalla Valentina, L.V.(Universidade do Estado de Santa Catarina); Folgueras, M.V.(Universidade do Estado de Santa Catarina); The high estimate of growth in the generation of construction and demolition wastes (C&D waste), as well as the waste foundry sand (WFS), lead to increased research to enable reuse and / or recycling of these materials. In this context, the present work carried out resistance analysis on structural concrete blocks of concrete produced with the combination of both residues in different percentages. The first analysis was carried out only with the casting sand and was aimed to verify that the material posed a risk to health and to the environment. Afterwards were performed tests of strength, durability and water absorption. Both tests showed that: 1) for samples containing 30% of WFS, regardless of the percentage of C&D waste, resistance ranged from 15 to 16 MPa; 2) The increase of the percentage of C&D waste caused reduction in the resistance for all proportions of WFS; 3) For the percentage of 10% of WFS and 0% of WFS there was increase in resistance when compared to the reference concrete block, without residues; 4) The combination of 10% of WFS with 20% of C&D waste obtained increased resistance when compared to the sample with 0% WFS and 20% C&D waste, but lower than the resistance of the reference block; 5) The WFS presented positive results in the leaching and solubilization tests. The analysis of the results shows that it is possible to make blocks with the use of both residues simultaneously. However, caution was needed in choosing the percentages used due to the increase of fineness in foundry sand, when compared to natural sand, and percentage of fines in C&D waste, which causes a higher percentage of adsorbed water in the material, making it less resistant and susceptible to cracking when exposed to the compression force.
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