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  2. Ready-mix concrete - Wikipedia

    en.wikipedia.org/wiki/Ready-mix_concrete

    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. Better handling and proper mixing practice will help reduce the consumption of cement by 10 – 12%.

  3. Gypsum concrete - Wikipedia

    en.wikipedia.org/wiki/Gypsum_concrete

    US patent 4,444,925 lists the components of Gyp-Crete® as atmospheric calcined gypsum, sand, water, and small amounts of various additives.Additives listed include polyvinyl alcohol, an extender such as sodium citrate or fly ash, a surfactant such as Colloid defoamer 1513 DD made by Colloids, Inc., and a fluidizer based on sodium or potassium derivatives of naphthalene sulfonate formaldehyde ...

  4. Slip forming - Wikipedia

    en.wikipedia.org/wiki/Slip_forming

    The first residential building of slipform construction; erected in 1950 in Västertorp, Sweden, by AB Bygging Later picture of the residential building in Västertorp. Slip forming, continuous poured, continuously formed, or slipform construction is a construction method in which concrete is placed into a form that may be in continuous motion horizontally, or incrementally raised vertically.

  5. Quikrete to take Summit Materials private in deal valued at ...

    www.aol.com/quikrete-buy-summit-materials-deal...

    (Reuters) -Summit Materials said on Monday rival Quikrete would acquire the company in a deal valued at $11.5 billion, in a move to capitalize on higher demand for building materials. The company ...

  6. Meniscus (liquid) - Wikipedia

    en.wikipedia.org/wiki/Meniscus_(liquid)

    When a tube of a narrow bore, often called a capillary tube, is dipped into a liquid and the liquid wets the tube (with zero contact angle), the liquid surface inside the tube forms a concave meniscus, which is a virtually spherical surface having the same radius, r, as the inside of the tube. The tube experiences a downward force of magnitude ...

  7. Concrete slump test - Wikipedia

    en.wikipedia.org/wiki/Concrete_slump_test

    The test is carried out using a metal mould in the shape of a conical frustum known as a slump cone or Abrams cone, that is open at both ends and has attached handles.The tool typically has an internal diameter of 100 millimetres (3.9 in) at the top and of 200 millimetres (7.9 in) at the bottom with a height of 305 millimetres (12.0 in).The cone is placed on a hard non-absorbent surface.

  8. Field-tube boiler - Wikipedia

    en.wikipedia.org/wiki/Field-tube_boiler

    Field tube, sectioned. A Field-tube boiler (also known as a bayonet tube [1]) is a form of water-tube boiler where the water tubes are single-ended. The tubes are closed at one end, and they contain a concentric inner tube. Flow is thus separated into the colder inner flow down the tube and the heated flow upwards through the outer sleeve.

  9. Internally rifled boiler tubes - Wikipedia

    en.wikipedia.org/wiki/Internally_rifled_boiler_tubes

    The internally rifled (also known as ribbed) tubes are used in boilers and heat exchangers to improve the efficiency of heat transfer. The rifling imparts a centrifugal force to the flowing fluid (commonly a mixture of steam and water). This separates water from the mixture, forces the water towards the wall, and prevents formation of a steam ...

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