International Science and Technology Journal

In this research، the effect of changing the ratio of water to cement and the percentage of aggregate to cement on the compressive strength of concrete was studied، from this point of view we found that it is important as it was to study the components of concrete from the physical aspects and study the factors that affect the compressive resistance of concrete cubes، the most important of which is W/C water to cement ratio as well as aggregate ratio to cement A / C and to generalize Scientific benefit for this subject has been chosen quarry for coarse aggregate (1.5 and 1) cm، which is located within the municipality of Masalata، while fine aggregate was from the city of Zliten، has determined the values of W/C = (0.40، 0.45، 0.50) and A/C = (4،4.3). and conducted laboratory tests and compared with British specifications. It was shown from the results and figures that since the experiments had a ratio A/C= 4 they gave a greater compressive strength than when containing a ratio of A/C= 4.3، for all samples. We recommend conducting further experiments an studies on other ratios W/C and (A/C) and various other quarries to see the extent of their effect on concrete mixture. Keywords: Properties of concrete – plain of concrete – absorption – coarse aggregate - fine aggregate - concrete mixtures