A SIMPLIFIED MODEL FOR PREDICTION OF SHRINKAGE BEHAVIOUR OF HIGH PERFORMANCE CONCRETE CONTAINING SUPPLEMENTARY CEMENTITIOUS MATERIALS

Abstract

In this study, autogenous and drying shrinkage of nine high performance concrete (HPC) mixes that are commonly used for bridge decks and bridge overlays were monitored with time. The mixes contained 10-30% of class C fly ash (FA) and 25-45% ground granulated blast-furnace slag (GGBFS) replacement for cement. Based on the shrinkage measurements, a statistical model was developed for describing and predicting shrinkage behaviour of concrete made with different types and amounts of supplementary cementitious materials (SCMs). The results indicate that this new simplified, exponential model can well predict shrinkage behavior of concrete and mortar made with materials similar to those used in the present study. From the newly developed model, the physical meaning of ultimate shrinkage and rate of shrinkage are further elucidated, and the effects of SCMs on concrete shrinkage behaviour are clearly expounded..