Abstract
To predict the progression of ASR, both chemical aspect and physical aspect should be taken into consideration. As first step of this study, chemical analysis and diffusion analysis were carried out. Through these investigations, we developed chemical model for the generation of ASR gel and the consumption of alkali by reactive aggregate. We also developed physical model which predicts concrete expansion from the amount of ASR gel. Our physical model indirectly considers the influences of damages induced in concrete matrix during expansion process. As second step of this study, we considered about the mechanism of the unique phenomenon that ASR expansion is significantly reduced when rebar restrains concrete somewhat. We developed ASR expansion model which evaluates the restraint effect of rebars by expressing the migration of ASR gel into capillary pores with pore size distribution function (PSD function). By comparing with experimental results of concrete bar specimens, our model was verified to predict the expansion of reinforced concrete due to ASR.
