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'''Concrete''' is a material commonly used in construction. It is composed of cement, aggregate, water and special chemicals known as admixtures.
'''Concrete''' is a material commonly used in [[construction]]. It is composed of [[cement]], aggregate, [[water]] and special [[chemicals]] known as admixtures.
==Cement==
Usually, Portland cement is used to make concrete. Portland cement contains calcium silicates.
==Admixtures==
==Admixtures==
==Reinforced concrete==
==Reinforced concrete==
Concrete is very strong in compression, but weak in tension. To make it a more useful construction material, steel bars are often installed in fresh concrete, to increase the tensile strength.
Concrete is very strong in compression, but weak in tension. To make it a more useful construction material, [[steel]] bars (rebar) are often installed in fresh concrete, to increase the tensile strength.
[[Category:Materials]]
[[Category:Materials]][[Category:Construction]]