Question

_________________ is obtained when alum is calcined with Plaster of Paris.

(a) Parian cement

(b) Martin cement

(c) Keene’s cement

(d) Colourcrete Cement

The question was asked in semester exam.

This key question is from Special Materials for Plastered Surfaces in chapter Pointing and Plastering of Construction & Building Materials

Answer 1

Correct answer is (c) Keene’s cement

Best explanation: Keene’s cement is useful for situation such as angles, skirtings, etc. as it sets hard in few days, giving white and glass like polish. Whereas borax is calcined with plaster of Paris, Parian cement is obtained. It can be used in place of Keene’s plaster.