crushed rock aggregate is commonly used as coarse aggregate in concrete and asphalt production. /fine aggregate could also be produced from crushed rock and it is one of the suitable materials identified for use on alternative to river sand.This material usually has a high content of fines associated with clay size particles considered to be harmful in a concrete. However,if properly controlled, the fines in crushed rock aggregate could be used to advantage in improving the strength of concrete produced or in reducing the cement content