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Unit cell: a = 5.679(5), b = 15.202(14) ... Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, ... Gypsum board [36] is primarily used as a ...
A gypsum block is made of gypsum plaster and water. The manufacturing process [1] is automated at production plants where raw gypsum (CaSO 4 ·2H 2 O) is ground and dried, then heated to remove three-quarters of the bound water and thus transformed into calcium sulfate hemihydrate (CaSO 4 ·½H 2 O), also known as gypsum plaster, stucco, calcined gypsum or plaster of Paris.
Gypsum concrete is lightweight and fire-resistant. A 1.5-inch slab of gypsum concrete weighs 13 pounds per square foot versus 18 pounds per square foot for regular concrete. [10] Even though gypsum concrete weighs less, it still has the same compressive strength as regular concrete, based on its application as underlayment or top coat flooring ...
Various sized cuts of 1 ⁄ 2 in (13 mm) drywall with tools for maintenance and installation . Drywall (also called plasterboard, dry lining, [1] wallboard, sheet rock, gib board, gypsum board, buster board, turtles board, slap board, custard board, gypsum panel and gyprock) is a panel made of calcium sulfate dihydrate (), with or without additives, typically extruded between thick sheets of ...
One major disadvantage of cement board is the weight per square foot. It is approximately twice that of gypsum board, making handling by one person difficult. Cutting of cement board must also be done with carbide-tipped tools and saw blades. Due to its hardness, pre-drilling of fasteners is often recommended.
Special wall fasteners (screw wall plug anchors) designed for autoclaved aerated concrete including gypsum board and plaster tiles are available at a higher cost than standard expandable wall plugs, including special safety-relevant anchors for high load bearing; [58] [59] [60] It is recommended that fixing holes be drilled using HSS drill bits ...
Typical constituents of portland clinker plus gypsum showing cement chemist notation (CCN) Clinker CCN Mass Tricalcium silicate (CaO) 3 · SiO 2: C 3 S: 25–50% Dicalcium silicate (CaO) 2 · SiO 2: C 2 S: 20–45% Tricalcium aluminate (CaO) 3 · Al 2 O 3: C 3 A: 5–12% Tetracalcium aluminoferrite (CaO) 4 · Al 2 O 3 · Fe 2 O 3: C 4 AF: 6 ...
In recent years, [when?] gypsum board manufacturers have started to offer lightweight drywall board: Normal-weight gypsum has a nominal density of 43 pounds per cubic foot (690 kg/m 3), and lightweight drywall has a nominal density of 36 pounds per cubic foot (580 kg/m 3). This does not have a large effect on the STC rating, though lightweight ...