From the comparison, it shows that there is a good correlation between the compressive strengths of aggregates and a few of the aforementioned engineering properties of coarse aggregates. The influence of aggregate strength on the compressive strength of highstrength concrete is signiant.
between the maximum coarse aggregate size and the compressive strength follows a polynomial with R 2= 1; indicating that the model is reliable. The optimum maximum coarse aggregate size for the best compressive. strength of 28 day concrete was therefore found to be 8mm for the water/cement ratio of
compressive strength increased by %, % and % respectively. An attempt has been made in the present investigation to study the influence of addition of waste materials of metal bottle caps of drinks as fibers and as coarse aggregate in concrete production using Orange leaves powder as a plasticizer.
However, the maximum size of coarse aggregate in RC or PC structures is generally 20mm or 25mm. Therefore, the percentage of the area occupied by coarse aggregate against crosssectional area of the core specimens increases. Hence, condition of coarse aggregate in the specimen will influence the compressive strength value (SHIMIZU .
partial replacement for coarse aggregate in concrete is studied. The density, slump and compressive strength of concrete are tested. The replacement of coarse aggregate by coconut shell by 0%, 10%, 20% and 30%. The tests were carried out and the results obtained suggested that the replacement more than 20% leads to lightweight .