Adoption of specific surface for control of cement grinding began during WWII, and a specific surface minimum of 225 m 2 /kg was introduced into the British Standard in 1947, and remained unchanged until 1989, when it was raised to 275 m 2 /kg.
The Egyptians used calcined gypsum as a cement and the Greeks and Romans used lime made by heating limestone and added sand to make mortar, with coarser stones for concrete. The Romans found that a cement could be made which set under water and this was used for the construction of harbours.
The success of grinding wheels began in the early 1840s, when bonds containing rubber or clay were introduced, and by the 1870s a bond with a vitrified or glass-like structure was patented. Live Chat; Cement Machinery Cement Making Machine Latest . Find here Cement Machinery, Cement Making Machine manufacturers, suppliers exporters in India
The origin of hydraulic cements goes back to ancient Greece and Rome. The materials used were lime and a volcanic ash that slowly reacted with it in the presence of water to form a hard mass. This formed the cementing material of the Roman mortars and concretes of more than 2,000 years ago and of subsequent construction work in western Europe.