The shape and surface texture of aggregate particles are important for both portland cement concrete and asphalt concrete. For preparing PCC, would you prefer round and smooth aggregate or rough and angular aggregate? Briefly explain why (no more than two lines). For preparing HMA, would you prefer round and smooth aggregate or rough and angular aggregate? Briefly explain why (no more than two lines).

For preparing PCC (plain cement concrete), a smooth and round aggregate is preferable to increase the workability of fresh concrete during mixing. The cementing action and aggregate interlock are responsible for the stability of PCC.

For preparing HMA (hot mix asphalt) rough and angular aggregate is preferred because the aggregate interlock develops the stability of asphalt.

codiepienagoya codiepienagoya · Answer 2 · 2021-12-17T13:45:20+01:00

We like smooth and spherical aggregate for PCC preparation, and We prefer rough and angular aggregate for HMA preparation.

The PCC If we are using round-shaped aggregate, the flowability of the concrete will rise.
However, the load-carrying compressive strength of concrete may decrease dramatically, it contact amongst the round-shaped aggregates will be minimal.
When resistance would occur in the angular aggregate, increasing the ductility.
As a result, angular-shaped grain was favored in portland cement concrete.
Its HMA If we are using round-shaped aggregate again, there will be less friction between the two aggregates, so the binding of the aggregates will be slack, and the road will wear off more readily.
When a vehicle is traveling from over pavement, its angular material will provide more resistance to the wheels, while around aggregate will produce little friction, making driving on round aggregate asphalt difficult.
As a result, angular aggregate must be used in hot mix asphalt (HMA).

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