Building Materials
Asbestos

All of these
Contains iron oxide and alumina
Is a natural fibrous mineral substance
Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)

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Building Materials
Rapid hardening cement attains early strength due to

Lesser proportion of lime grounded coarser than normal cement
Lesser proportion of lime grounded finer than normal cement
Excess percentage of gypsum
Larger proportion of lime grounded finer than normal cement

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