Changes

'''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==

==Cement==

==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 are often installed in fresh concrete, to increase the tensile strength.

[[Category:Materials]]

[[Category:Materials]]