MODELING OF CRACK OCCURRENCE IN CONCRETE DETERIORATED BY ALKALI AGGREGATE REACTION AND PROPOSAL OF ANALYSIS METHOD

Abstract

The deterioration of concrete structures by an alkali aggregate reaction is the important issue. It is necessary to build up the numerical analysis method to reproduce alkali-aggregate reaction which causes cracking or the fracture of steel bar. In this study, a numerical model is proposed in order to simulate the behaviors of concrete structures damaged by the alkali aggregate-reaction and is implemented into a finite element analysis code. Numerical results simulated by the proposed method and measurement data, such as the distribution and deformation of cracks occured in the bridge abutment damaged by the alkali aggregate-reaction, are compared. By considering the comparisons of the numerical results and the measurement data in terms of the distribution, deformation and fracture energy of cracks, it is clarified that the proposed method is able to predict the behaviors of concrete structure damaged by the alkali-aggregate reaction. It is considerd that the proposed method has availability for the prediction of the deterioration of concrete structures damaged by the alkali aggregate-reaction.