Simulação numérica de pilar afetado pela reação álcali-agregado

Abstract

The chemical reaction involving the alkalis from Portland cement and minerals of concrete aggregates, the AAR, is cause of expansive effect that, in view of its potential deleterious in structural members, arouses attention in the field of Civil Engineering. In its State-of-the-art the theme has the satisfactory numerical modeling support and good amount of records experimental tests, however, it still lingers in incipient stage. The numerical simulation represents relevant tool to the assessment of damage caused by the reaction, and their repairs. The aim of this work is the performance numerical simulation of columns, affected by the AAR. For the analysis it is adopted the finite element method on an orthotropic nonlinear model, and a thermodynamic formulation for the AAR deformations. The results showed that, although the expansion arising from the reaction was immaterial provoked discrete variations in the stress magnitude, the pathology-related concrete strength reduction induced the safety margin decline the structural member stability.