Concrete is a composite building material made from the combination of aggregate and a binder such as cement.
The most common form of concrete is Portland cement concrete, which consists of mineral aggregate (generally gravel and sand), portland cement and water.
After mixing, the cement hydrates and eventually hardens into a stone-like material.
When used in the generic sense, this is the material referred to by the term concrete.
For a concrete construction of any size, as concrete has a rather low tensile strength, it is generally strengthened using steel rods or bars (known as rebars).
This strengthened concrete is then referred to as reinforced concrete.
In order to minimise any air bubbles, that would weaken the structure, a vibrator is used to eliminate any air that has been entrained when the liquid concrete mix is poured around the ironwork.
Concrete has been the predominant building material in this modern age due to its longevity, formability, and ease of transport.
Recent advancements, such as Insulating concrete forms, combine the concrete forming and other construction steps (installation of insulation). All materials must be taken in required proportions as described in standards.
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