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  2. Interface, Inc. - Wikipedia

    en.wikipedia.org/wiki/Interface,_Inc.

    Interface was founded in 1973 by Ray Anderson, whose decade and a half in the carpet trade had led him to create one of the first U.S. manufacturers of carpet tiles, also known as modular carpet or carpet squares. Carpet tiles, which originated in Europe, became highly popular during the 1980s as an alternative to broadloom carpet, especially ...

  3. Carpet - Wikipedia

    en.wikipedia.org/wiki/Carpet

    These include insulating a person's feet from a cold tile or concrete ... Carpet is commonly made in widths of 12 and 15 feet (3.7 and 4.6 m) in the US and 4 and 5 m ...

  4. Types of concrete - Wikipedia

    en.wikipedia.org/wiki/Types_of_concrete

    Foam concrete is produced by mixing cement or fly ash, sand, water, and a synthetic aerated foam, which provides stability to the air bubbles, in contrast to air-entrained concrete which is produced incorporating specialized admixtures directly into the concrete mix. Foam concrete offers excellent thermal and acoustic insulation properties ...

  5. Water–cement ratio - Wikipedia

    en.wikipedia.org/wiki/Water–cement_ratio

    A higher ratio gives a too fluid concrete mix resulting in a too porous hardened concrete of poor quality. Often, the concept also refers to the ratio of water to cementitious materials, w/cm. Cementitious materials include cement and supplementary cementitious materials such as ground granulated blast-furnace slag (GGBFS), fly ash (FA), silica ...

  6. Properties of concrete - Wikipedia

    en.wikipedia.org/wiki/Properties_of_concrete

    Engineers usually specify the required compressive strength of concrete, which is normally given as the 28-day compressive strength in megapascals (MPa) or pounds per square inch (psi). Twenty eight days is a long wait to determine if desired strengths are going to be obtained, so three-day and seven-day strengths can be useful to predict the ...

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  9. Cement - Wikipedia

    en.wikipedia.org/wiki/Cement

    6.9 23 18 12 — Fe 2 O 3: 3 11 6 1 — CaO 63 5 21 40 < 1 MgO 2.5 — — — — SO 3: 1.7 — — — — Specific surface (m 2 /kg) [d] 370 420 420 400 15,000 – 30,000 Specific gravity 3.15 2.38 2.65 2.94 2.22 General purpose Primary binder Cement replacement Cement replacement Cement replacement Property enhancer

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