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Q: What type of cements can be used to make stucco?
A:  There
are many types of hydraulic cements that can be used as a binder
for stucco, or portland cement plaster. The cement standards used
in the U.S. most often are from the American
Society for Testing and Materials.
A hydraulic cement is one that sets and hardens when mixed with
water. Cement, along with sand and water, are the basic ingredients
of a plaster mix. The following materials are candidate binders
for stucco:
- Portland Cement, ASTM C 150
- Blended Cement, ASTM C 595
- Hydraulic Cement, ASTM C 1157
- Masonry Cement, ASTM C 91
- Plastic Cement/Stucco Cement, ASTM C 1328 (primarily available
in the west and southwest United States)
Hydrated lime, either ASTM C 206 Finishing Hydated Lime or C 207
Hydrated Lime for Masonry Purposes, are also used with portland
cement to provide workability. Hydrated lime may be used with blended
cement or hydraulic cement, too, but is not used with masonry cement,
mortar cement, or plastic or stucco cement. Those materials already
contain workability agents and the addition of lime is neither necessary
not allowed. If used with those materials, lime poses potential
problems such as reduced strength or durability.
 White
cements are also available for use in stucco. They are generally
specified under C 150, C 91, or C 1328. (More
on specifying white cement.) Sometimes they are blended with
pigment in the factory or on the job to create colored mixes. Where
white or colored plaster mixes are used, they often are applied
only as the finish coat.
Standards for all of these materials are available from ASTM.
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