Concrete is the most used construction material in the world. It is made from aggregates that are finer in size (sand) as well as those that are courser (gravel), cement, and water (with the possible addition of admixtures). There are different sorts of concrete (reinforced concrete, fibre-reinforced concrete, pre-stressed concrete, etc.) and these concretes are classified based on their durability and their compressive strengths.
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