Concrete is a composite material which consists of fine or coarse aggregate and cement paste. Both coarse aggregates and fine aggregates are the main constituents of concrete and they are not only giving the body to the concrete, it also has a significant effect on the fresh and hardened concrete based on aggregate's shape, size, texture and grading. Properties of concrete was determined by replacing normal coarse aggregate with 0%, 10%, 20%and 30%weight of combined flaky and elongated aggregates, with 12 samples for each percent of replacement, and 12 * 3=36 samples for 7, 14 and 28 ages. Replacing 30%of combined flakiness and elongated aggregate into the concrete produce the mixes: too coarser, dry mix, harsh mixtures, difficult finish ability and pumpability, and lower compressive strength. Therefore, the flaky and elongated shape of aggregate should be avoided or limited to less than 20%in order to keep proper concrete properties.
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