Effects of Crude Oil on Workability and Compressive Strength of Concrete

The research aims to study the effect of adding crude oil on the workability and compressive strength of concrete, where it was noted that there are significant changes in the properties of concrete that were provided when varying percentages of crude oil were added. In this study, different percentages of crude oil were used, constituting (0%, 1%, 2%, 2.5%, 3%, 4%, 5%, 6%, 10%, 15%, 20%, 25%) of The weight of the fine aggregate used in the concrete mixtures, where the results of the laboratory examination of the amount of slump as a measure of the workability of the concrete showed that there was a collapse of the concrete after fixing it in the test cone when adding percentages of crude oil more than 6%, which indicates that the addition of crude oil causes a delay in the cement reactions And water, and this indicates that its presence hinders the bonding between the components of concrete, and thus leads to the separation of these components from each other. As for the results of the compressive strength test, the concrete cubes that were tested at the age of (7) days proved that the compressive strength decreases when adding percentages ranging from (1%) to (5%), then it starts to increase from (5%) to (10%) and then back. to decreasing again, which indicates an improvement in the compressive strength of concrete when adding a ratio of (10%) and a higher percentage of the compressive strength in the event that crude oil is not added to its components. The study also showed that there is an improvement in the compressive strength when adding percentages of crude oil ranging Between (6%) and (15%).