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  2. Gypsum block - Wikipedia

    en.wikipedia.org/wiki/Gypsum_block

    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.

  3. Gypsum concrete - Wikipedia

    en.wikipedia.org/wiki/Gypsum_concrete

    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 ...

  4. Portland cement - Wikipedia

    en.wikipedia.org/wiki/Portland_cement

    51% (C 3 S), 24% (C 2 S), 6% (C 3 A), 11% (C 4 AF), 2.9% MgO, 2.5% (SO 3), 0.8% ignition loss, and 1.0% free CaO. A limitation on the composition is that the (C 3 A) shall not exceed 8%, which reduces its vulnerability to sulphates. This type is for general construction exposed to moderate sulphate attack, and is meant for use when concrete is ...

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  6. Phosphogypsum - Wikipedia

    en.wikipedia.org/wiki/Phosphogypsum

    The construction industry is the number one user of phosphogypsum in 2020, with 10.5 Mt used as concrete set retarder and 3.5 Mt used in drywall. [13] It is also used as a chemical feedstock for producing sulfates, and as a soil conditioner similar to regular gypsum. [14]

  7. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    8-inch (200 mm) hollow CMU (concrete masonry unit) with 3-inch (76 mm) steel studs, fiberglass insulation and 1 ⁄ 2-inch (13 mm) drywall on each side [35] 72 8-inch (200 mm) concrete block wall, painted, with 1 ⁄ 2-inch (13 mm) drywall on independent steel stud walls, each side, insulation in cavities

  8. Cracker Barrel unveils new menu items for 2025: 'Original and ...

    www.aol.com/cracker-barrel-unveils-menu-items...

    Cracker Barrel's new early dinner deals give customers the option to choose smaller portions of fan favorites – including meatloaf and steak tips – starting at $8.99 between 4 p.m. and 6 p.m ...

  9. "American Nightmare" victims help get Matthew Muller to ... - AOL

    www.aol.com/american-nightmare-victims-help...

    "American Nightmare" victims Denise Huskins and Aaron Quinn worked with two small-town law enforcement officials to get kidnapper Matthew Muller to confess to more cold case crimes.