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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.
If concrete made with Portland cement or blast furnace slag cement is subjected to heat, a number of transformations and reactions occur, even if there is only a moderate increase in temperature.5,6 As aggregate materials normally occupy 65 to 75% of the concrete volume, the behavior of concrete at elevated temperature is strongly influenced by the aggregate type.