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  2. Properties of concrete - Wikipedia

    en.wikipedia.org/wiki/Properties_of_concrete

    Concrete has a very low coefficient of thermal expansion, and as it matures concrete shrinks. All concrete structures will crack to some extent, due to shrinkage and tension. Concrete which is subjected to long-duration forces is prone to creep. The density of concrete varies, but is around 2,400 kilograms per cubic metre (150 lb/cu ft). [1]

  3. Compressive strength - Wikipedia

    en.wikipedia.org/wiki/Compressive_strength

    Cubic or cylindrical samples of concrete are tested under a compression testing machine to measure this value. Test requirements vary by country based on their differing design codes. Use of a Compressometer is common. As per Indian codes, compressive strength of concrete is defined as: Field cured concrete in cubic steel molds (Greece)

  4. Shore durometer - Wikipedia

    en.wikipedia.org/wiki/Shore_durometer

    Rubber band: 25: A Door seal: 55: A Automotive tire tread: 70: A Soft wheels of roller skates and skateboard: 78: A Hydraulic O-ring: 70–90: A Pneumatic O-ring: 65–75: A Hard wheels of roller skates and skateboard: 98: A Ebonite rubber: 100: A Solid truck tires: 50: D Hard hat (typically HDPE) 75: D Cast urethane plastic: 80: D

  5. Concrete mixer - Wikipedia

    en.wikipedia.org/wiki/Concrete_mixer

    0.75 m³ (1 cubic yard) cart-away mixing trailer. A variant of standard concrete transportation is the concrete (or, cement) mixing trailer. These small versions of transit-mix trucks are used to supply short loads of concrete. They have a concrete mixing drum with a capacity of between 0.76 and 1.34 cubic metres (1 and 1.75 cu yd).

  6. Ready-mix concrete - Wikipedia

    en.wikipedia.org/wiki/Ready-mix_concrete

    Speed in the construction practices followed in ready mix concrete plant is followed continuously by having mechanized operations. The output obtained from a site mix concrete plant using a 8/12 mixer is 4 to 5 metric cubes per hour which is 30-60 metric cubes per hour in a ready mix concrete plant.

  7. Concrete - Wikipedia

    en.wikipedia.org/wiki/Concrete

    The placement consisted of 10,251 cubic yards of concrete placed in 58.5 hours using two concrete pumps and two dedicated concrete batch plants. Upon curing, this placement allows the 50,180-square-foot (4,662 m 2 ) cofferdam to be dewatered approximately 26 feet (7.9 m) below sea level to allow the construction of the Inner Harbor Navigation ...

  8. Sulfur vulcanization - Wikipedia

    en.wikipedia.org/wiki/Sulfur_vulcanization

    To ensure high-quality vulcanization, the rubber, sulfur, accelerants, activators and other compounds are blended to give a homogeneous mixture. In practice, mixing can result in melting the sulfur (melting point 115 °C for S 8). At these temperatures vulcanization can begin prematurely, which is often undesirable, as the mixture may still ...

  9. Air entrainment - Wikipedia

    en.wikipedia.org/wiki/Air_entrainment

    Air entrainment in concrete is the intentional creation of tiny air bubbles in a batch by adding an air entraining agent during mixing. A form of surfactant (a surface-active substance that in the instance reduces the surface tension between water and solids) it allows bubbles of a desired size to form.

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