Experimental study on the influence of the shape, size and type of cement on the compressive strength of concrete specimens

Compressive strength test of concrete is one of the most important tests to control the quality of concrete in construction structures and based on the workshop conditions and rules of the relevant regulation and standards, the control specimens with different dimensions and shapes (cubic and cylindrical) are used. In this research for concrete grade C25 and using different types of cement, variations the conversion factors for strength of specimens with different shapes and dimensions was experimentally investigated. In this research with use the cement types 1-425, 2 and 5, totally 81 cubic and cylindrical concrete specimens with different size and dimensions (200×200×200) mm, (150×150×150) mm and (150×300mm) were made and tested at ages 3, 7 and 28 days. The result of this study show that in addition to the shape and size of the specimens, the type of cement used also affect the strength and conversion factor of the strength of the specimens with different shapes and sizes.