Study of Early-Age Creep and Shrinkage of Concrete Containing Iranian Pozzolans: An Experimental Comparative Study

This paper presents an experimental study on prediction of the early-age creep and shrinkage of concrete with and without silica fumes, trass, ground-granulated blast-furnace slag, combinations thereof, and in uences of the proposed Iranian pozzolans. Experiments were carried out under a controlled ambient condition at a temperature of 40 C and a relative humidity (RH) of 50%, and a laboratory ambient condition at a temperature of 20 C and a relative humidity (RH) of 30% in order to collect the required data. Comparisons are made between ACI209-92, BS8110-1986 and CEB1970 prediction models, and an estimation model, based on 28-day results (short-term test method), using the same experimental data to predict the creep and shrinkage of the specimens at the ages of 120 and 200 days after curing. The results show that the above-mentioned models are not accurate enough for predicting the creep and shrinkage of concrete containing local Iranian pozzolans. It was also observed that the prediction, based on short-term results, would lead to more accurate creep and shrinkage predictions.