Estudo de viabilidade da utilização da escória de aciaria na redução da expansão causada no concreto pela reação álcali-agregado

Abstract

The alkali-aggregate reaction (AAR) is a reaction that occurs between alkali cement and some mineral compounds present in certain aggregates, leading to concrete consequences, such as cracking. The alkali-aggregate reaction can be divided into three types: alkali-silica reaction, alkali-silicate and alkali-carbonate. Among these, the reaction with larger events also the most studied is the alkali-silica reaction (ASR), due to the rapidity with which this occurs as a function of reactive mineral forms involved. Several methods have already studied proved effective to control this reaction, one of the partial replacement of cement by additions such as pozzolans, among which may be cited the fly ash and steel slag source. In order to prove these results, this study aimed to study the use of electrical steel slag as reduction of alkali-aggregate reaction, being developed under the guidelines of NBR 15577:2008 Aggregates – Alkali-Aggregate Reactivity, evaluating different proportions partial replacement of cement by steel slag. Electrical steel slag, a non-traditional pozzolan, resulting in the production process of steel, despite its expansive feature proved to be efficient front of the ASR.