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*Pigments change the colour of the concrete.
*Pigments change the colour of the concrete.
*Bonding agents create a good bond when adding new concrete to old.
*Bonding agents create a good bond when adding new concrete to old.
==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.
[[Category:Materials]]