Building Materials, Third Edition

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The breaking load of the boards are given in Table 19.2.

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These can be solid or hollow, rectangular with straight and square edges and true surfaces. The
compressive strength of these partition blocks should not be less than 50 N/m^2 on gross area.
These boards are available in sizes as given in Table 19.3.

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It is finely ground powder containing an admixture, forms a gas on being mixed with water
and expands the mixture to 3 or 4 times its volume. This inflated paste hardens into a light,
cellular, fire resistant mass possessing good acoustical and insulating properties.

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1. (a) What is gypsum?
   (b) How is gypsum classified?
   (c) What is Keene’s cement?


2. (a) What is Plaster of Paris?What are its uses?
   (b) What are the various types of gypsum wall plasters?
   (c) Briefly describe the effect of heat and moisture on gypsum.


3. Write notes on:
   (a) Stucco (b) Hard finish plaster (c) Pyrocell