Potencialidades do aproveitamento do resíduo de estação de tratamento de efluentes do processo de lapidação do vidro sodo-cálcico na produção de concretos
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Data
2012-03-30
Autores
Antônio, Aline Pignaton
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Universidade Federal do Espírito Santo
Resumo
The search for the reuse of waste generated in the rapidly growing urban centers in order to save natural resources, has remained fairly constant, both in the context of preventing the exploitation of resources and waste disposal on the environment. The main objective of this study is to use the waste from the treatment plant effluent in the process of cutting glass soda - calcium as a partial substitute for cement in concrete production. The substitutions on the weight of cement by the residue used in powder form with a particle size of about 38 µm, followed proportions of 0, 5, 10, 15 and 20% for all tests included in this study. First, cement pastes were studied for determining the expansion. The fresh concretes were subjected to slump tests and tests for determination of incorporated air content, density and water exudation, according to the Brazilian Standards. To determine the mechanical properties of the hardened concrete steel-molded cylindrical specimens were produced, with diameter of 10 cm and 20 cm height, tested for compressive strength and tensile strength at ages 3, 7 and 28 days and modulus of elasticity at the age of 28 days. Statistical analysis of data obtained allowed establishing that the test results of compressive strength showed significant variation and were subdivided into three heterogeneous and distinct groups, while the results of other tests showed no significant variation and homogeneity between the groups. Mixtures with more waste had mechanical strength reduced, except for the modulus of elasticity, which showed appreciable upward trend with the highest levels of replacement. Still, the strength results obtained meet the current Brazilian Standards for structural concrete. Samples of cement pastes and hardened concrete were examined by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Crystalline inclusions of calcium hydroxide could be noticed at different levels for each sample.
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replacement , cement , waste , glass powder waste , concrete , Efluentes , substituição , cimento , resíduo , pó de vidro , efluentes , concreto
Citação
ANTÔNIO, Aline Pignaton. Potencialidades do aproveitamento do resíduo de estação de tratamento de efluentes do processo de lapidação do vidro sodo-cálcico na produção de concretos. 2011. Dissertação (Mestrado em Engenharia Civil) - Universidade Federal do Espírito Santo, Centro Tecnológico, Vitória, 2011.