CONTRIBUIÇÃO AO ESTUDO DAS PROPRIEDADES MECÂNICAS E DA DURABILIDADE DE CONCRETOS COM ESCÓRIA DE ACIARIA ELÉTRICA (EAF) COMO AGREGADO GRAÚDO / CONTRIBUTION TO THE STUDY OF MECHANICAL PROPERTIES AND THE DURABILITY OF CONCRETE WITH SLAG OF Residue (EAF) as aggregate

AUTOR(ES)

Ricardo Andrade Fernandes Faria

DATA DE PUBLICAÇÃO

2007

RESUMO

The increasing demand for aggregate for uses in engineering stimulated the search for alternative materials. In this way, the civil construction potentially started to be a great consumer of residues from other industries, becoming a great recycle plant. The use of by-product, brings great environmental benefits in relation to the degradation of the environment, as for example, less settlement of residues in earth fill, the reduction of extraction of natural resources, and the exploration of aggregate ores. Steel plants from around the world have a commom problem, that is what to do with all the steel slags generated as a by-product from the steel refining in electric steel plants or oxygen steel plants. There are two points of these process where slags can be generated: the first comes from the electric or oxygen furnace itself (called oxidizing refining) and the second is the laddle metallurgy slag (reduction refining slag), which is the last stage of the steel production. This aims to demonstrate related studies to the use of steel slags (EAF slags) in electric steel plants as coarse aggregate. Expansibility of the steel slag tests had been carried through, compressive strength, tensile strength for diametrical compression, related modulus of deformation and durability tests, such as: intensity of corrosion, potential of corrosion, ohmic resistivity and depth of carbonation. After this, it was observed the similarity of the results between the concrete made with steel slag and the concrete made with conventional aggregates, natural aggregate known as mica schist. It was observed improvements in the properties of the concrete with steel slag, such as: increase in its strength (compressive / tensile) and increase of the modulus of deformation. Concerning the durability, it was noted, in a general way, that the substitution of the aggregates, conventional for siderurgical, has not influenced in the performance of the concrete.

ASSUNTO(S)

concreto - resistencia concrete - durability concreto - aço - reaproveitamento concrete - resistencia concreto - aço - resíduos industriais - reaproveitamento engenharia civil concreto - durabilidade concrete - steel - reuse concrete - steel - waste industrial - reuse

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