Comparison of Drying Shrinkage Models of IOTs Concrete

Abstract

ABSTRACT Problems associated with drying shrinkage of concrete is still a major concern in the construction industry. Due to the hygral nature of concrete, particularly the instability of the volume as a result of drying shrinkage, concrete will crack at any stage during its service life. The depletion of the environment due to huge consumption of sand for construction is a major problem. Iron ore tailings (IOTs), an industrial waste, generated during the production of iron ore is utilized in concrete to alleviate environmental problems. The iron ore tailings were sourced from five different mines to produce five types of normal weight concrete. The drying shrinkage of these concrete were compared with that of the control normal weight concrete. The ultimate shrinkage of all the concrete samples were further studied, using three prediction models. The inclusion of iron ore tailings in concrete contributed to reduction of drying shrinkage. The prediction of the ultimate drying shrinkage of IOTs concrete based on the analysis of three models revealed