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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.
Cite. Please copy/paste the following text to properly cite this Pavement Interactive article: Asphalt concrete base (ACB), also called asphalt treated base (ATB), is a dense-graded HMA with a larger nominal maximum aggregate size (1 inch) intended for use as a base course or binder course (see Figure 1).In addition to site paving benefits, ACB can be advantageous because it can provide: The minimum recommended crushed aggregate base thickness is 4 inches. 2  Substituting ACB for a portion of crushed aggregate is often acceptable, however if any crushed aggregate is to remain it should be at least 4 inches thick.