WHAT IS CONCRETE
Contrary to popular belief, concrete and cement are not the same thing; cement is actually just a component of concrete. Concrete is made up of three basic components: water, aggregate (rock, sand, or gravel) and Portland cement. Cement, usually in powder form, acts as a binding agent when mixed with water and aggregates. This combination, or concrete mix, will be poured and harden into the durable material with which we are all familiar.
Following is a group of articles that will be helpful when trying to understand more about concrete and cement. Other items that might be of interest to you include concrete basics such as mix design, and cement information.