Experimental Study on the effects of waste engine oil as superplasticizer on the properties of High strength concrete

Abstract

Using industrial wastes or by-products as raw materials in cement and concrete is a common practice in modern building. This research was deals with the effects of waste engine oil as superplasticizer on properties of high strength concrete like workability, compaction factor, strength, durability and microstructure. Four mixes were used as 1% Superplasticizer, 1% of used engine oil, 2% superplasticizer and 2% used engine oil from weight of cement in kg. The test conducted were slump test, compaction factor, compressive strength test, split tensile strength test, water absorption, ultrasonic pulse velocity and scanning electron microscopy analysis. From total 72 concrete samples, 48 were cubes and 24 were cylindrical samples. The results of this research for workability tests show as the mix of used engine oil show less slump value when compared to control but it is in the range of 25-50mm which was designed value. Mix with addition of 1% of used engine perform higher compressive strength than control at 28 curing days, thus at 2% compressive strength decreased from control by 5%. The same things occurred for split tensile strength. At addition of 1%, the mix with used engine oil improves split tensile strength by 2.08%. From second control the mix perform less strength decreased by 15.5%.This due to different minerals in used engine which can affect the hydration of cement. Water absorption and UPV tests were prove that less water absorption and high UPV resulted for the higher compressive strength which is accepted by engineering properties of concrete. Used engine oil show the positive effect on the hydration products at optimum dosage of 1% from weight of cement in kg. Beyond optimum dosage, the sulphate and calcium sulphate in this by product would cause the expansive ettringite.