Principal objective of this research study was to investigate the effects of used engine oil
on the properties of fresh concrete i.e. slump and air content and hardened concrete i.e.
compressive strength, porosity and the coefficient of oxygen permeability. Concrete
mixes were made of 100% cement (OPC) and OPC blended with fly ash, FA as partial
replacement. The used engine oil dosage was kept 0.15% after various trial mixes.
Properties of concrete containing used engine oil were compared with the properties of
concrete containing new engine oil, commercially produced air entraining agent,
superplasticiser and the plain concrete.