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The coarse aggregates act like bone in concrete. If we use low quality aggregate in concrete mix, the strength of concrete will be low. The amount of aggregate greatly affects the properties of hardened concrete. Increasing the amount of aggregate at a constant cement content reduce the concrete strength. Strength of concrete can also be affected by the type of aggregate. Such as, angular and rough surface concrete increase the concrete strength.
45% limit for concrete other than wearing surfaces and a 30% limitfor concrete for wearing surfaces, respectively. From the results, itwas observed that the crushing value of fresh aggregate is 17.77%,itis19.86,27.33,and31.44%,respectively,forrecycledaggregateswith 5, 10, and 15 years of age.