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Re: Plaster

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Marlou,

Plaster is generally not used for its compressive strength qualities, so
there is not likely to be much reference data available.

There are numerous formulations of plaster: gypsum, lime-gypsum, portland
cement-lime.  Your specific formulation will probably need to be tested to
establish a strength.

If you are working with an existing plaster, you may not be able to cut a
testable specimen out of it.  However, it may be worth a try and you may get
some useful information.

U.S Gypsum plasters have various constituents; some, like their structo-base
are very hard -- equivalent to concrete-- but U.S Gypsum will not provide
any strength data on it.

Nels Roselund
Structural Engineer