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Admixtures are those which are added to concrete to give some desired quality to the concrete.
As per the report of ACI committee 212 admixtures have been classified into 15 groups according to type of materials constituting the admixture or characteristic affect of the use. The following are 15 groups:
Ferrocement is a relatively new material consisting of mortar made with portland cement, water and aggregate with reinforcing mesh.
P.L. Nervi an Italian engineering and architecture developed this material in 1940.