CREEP AND DRYING SHRINKAGE OF CONCRETE CONTAINING HIGH VOLUME PALM OIL FUEL ASH
Advancement in concrete technology has given rise to application of high volume of some industrial waste in the production of normal strength concrete. Fly ash has been found to perform favourably in this regard, and this trend is expected to continue in the years ahead because of technological, economical and ecological advantages of the material. This study investigates the potentials of high volume palm oil fuel ash (POFA) replacement of ordinary Portland cement (OPC) and presents experimental results on the creep and drying shrinkage of concrete containing high volume palm oil fuel ash. Concrete specimen containing 50, 60 and 70% POFA were made and tested for creep and drying shrinkage for a period of 120 days. The results obtained were compared with that of 100% OPC concrete. It was observed that, concrete containing 50% POFA had a reduced creep strain of 7%, while concrete containing 60 and 70% POFA showed slightly higher creep strain. Like that of creep strain, a comparatively lower magnitude was observed in drying shrinkage of samples containing 50% POFA. The drying shrinkage value, however, was found to increase with the increase in the amount of ash in concrete.