A piece of concrete from a driveway is not considered a rock because it is man made rock
Cement, gravel, and water are combined to create the composite building material known as concrete. Cement, sand, and tiny stones are combined to create the durable material known as concrete.
Concrete has been compared to "man-made rock" and while the analogy isn't perfect, we agree with the generalization. It has a cementitious matrix, physical characteristics that are largely similar to some sedimentary and igneous rocks, and a texture that is roughly comparable to breccias or conglomerate. It also performs fairly similarly to masonry over its working life in a building or engineering constructions. The evaluation of construction stones and the study and testing of concrete are very comparable.
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