Question

Write a brief note on the preparation and uses of either portland cement or plaster of paris

Answer 1

Plaster of paris is prepared by heating calcium sulfate dihydrate, or gypsum, to 120–180 °C (248–356 °F). With an additive to the set, it is called wall, or hard wall, plaster, which can provide passive fire protection for interior surfaces.

It is commonly used to precast and hold parts of ornamental plasterwork placed on ceilings and cornices. It is also used in medicine to make plaster casts to immobilize broken bones while they heal, though many modern orthopedic casts are made of fibreglass or thermoplastics.

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