Masonry Magazine August 2012 Page. 18
MANUFACTURED STONE
masonry product. See CSI Division 03 45 00.
Limestone is a natural stone made from sedimentary rock that is formed by accumulation of organic remains (shells or coral), consisting mainly of calcium carbonate. Shapes are achieved by sawing or fracturing the stone, which has a fine grained texture. Grade II Limestone is specified as per ASTM C568, which requires a minimum 4,000 psi, less than 7.5 percent absorption and no freeze thaw requirement is considered. It generally is used for architectural trim, facing and ornamentation and is not reinforced.
Calcium silicate masonry units are produced from sand and silica, which is mixed with hydrated lime and other elements. The no-slump mixture is then pressed into modular-sized molds and cured in an autoclave. Calcium silicate contains no Portland cement. The units produced can have a variety of textures and are used primarily as architectural veneer facing. Calcium silicate units must comply with ASTM C73 with MW Grade at 3,500 psi with maximum 14 percent absorption and SW grade at 5,500 psi with 11.6% maximum absorption. There is no freeze-thaw durability requirement and reinforcement is not available.
PROPERTIES COMPARISON CHART
| | PSI | Maximum Absorption | ASTM Designation | Durability Freeze Thaw | Reinforced |
| --- | --- | --- | --- | --- | --- |
| Cast Stone | 6,500 | 6% | C-1364 | 5% loss or less @300 cycles | Yes |
| Architectural Precast | 5,000 | 6% | None | None | Yes |
| Limestone Grade II | 4,000 | 7.5% | C568 | None | No |
| Calcium Silicate | Grade MW 3,500 Grade SW 5.500 (assuming average density of 129 bsid) | 14% 11.6% | C73 | None | No |
| AMSMV | 1,800-2,000 | 22% (UBC Standard 15-5) | None | None | No |
Adhered manufactured stone masonry veneer (AMSMV) is a lightweight man made concrete masonry product which is usually cast into random sizes, in a variety of colors with a natural undressed quarried or cleft stone finish. Sometimes referred to as adhered veneer, AMSMV is generally applied on a residential or lightweight commercial structures for exterior and interior walls, landscape structures, and other structures suitable to receive lightweight adhered units. These simulated stone products are manufactured to meet CSI Division 04 73 00 classification for simulated stone. There are currently no ASTM standard specifications for AMSMV.
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16 MASONRY
READER SERVICE #121
August 2012 www.masoncontractors.org
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