ASTM C Standard Specification for Aggregate for Job-Mixed Portland Cement-Based Plasters. Questions and answers on Stucco and Plastering March, Graded sand for cement-plaster and interior plaster. ASTM C , and ASTM C Find ASTM C products and abstract using the BuildSite database. Get the right product for the spec.
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The reason is that the smaller grains fill in the voids when the mortar is packed down. This specification covers natural or manufactured aggregate for use in job-mixed base and finish-coat full thickness Portland cement, Portland cement-lime and modified Portland cement plasters. When used as a stucco finishdifferent aastm are usually mixed together to vary the size for improved strength and appearance.
I know somebody out west who plasters boats.
The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Q-ROK comes in 3 grades, 1, or fine; 2, or medium and 3, coarse.
Number two is all xstmand number 1 is all fine. The main difference is that number 3 is all the same size about 3 mm. Now, gypsum plaster is only avaiable in 50 lb. When used in a cement basecoat for high strength applications such as stucco floors or cement boats, the various grits can quadruple the compressive strength of Portland cement mortar.
Graded sand for cement-plaster and interior plaster, ASTM C , and ASTM C
These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the specification. The varied grits, or different particle size adds increased strength and crack resistance to stucco. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided 8c97 part of the standard.
This is what we usually use in our stucco finish coat. Aggregate subjected to five cycles of the soundness test shall show a loss, when weighed in accordance with the grading of a sampling complying with the limitations set forth.
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This chart is completely ambiguous if you do the math, but the idea is that the sand is graded from coarse down to fine powder. What I am trying to say with all of this is that mortar can develop incredible strength by simply varying the grit of the sand, and using silica sand. To put this into perspective, the footers under your house are probably about 2, PSI.
The fineness modulus, friable particles, light constituents, organic impurities, material soundness, and sieve analysis of the aggregate shall be tested to meet the requirements prescribed.
This abstract is a brief summary of the referenced standard.
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Sand like Q-ROK is used in stucco finishes, but the grading is different. ASTM C is currently being specified a lot for interior basecoat plaster in Federal government work. His formula is 7 bags of varied grits of sand, that is one bag each of 1, 2, etc.
ASTM C is sold in bags for about 11 dollars a 50 lb. Distribution of the PDF is not permitted. Also, since the sand is irregularly shaped, larger width particles can pass through the sieves.