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  2. Voided biaxial slab - Wikipedia

    en.wikipedia.org/wiki/Voided_biaxial_slab

    Concrete is poured around these plastic forms to create internal voids in the slab A voided biaxial slab installation in Turkey. Voided biaxial slabs, sometimes called biaxial slabs or voided slabs, are a type of reinforced concrete slab which incorporates air-filled voids to reduce the volume of concrete required.

  3. DeWalt - Wikipedia

    en.wikipedia.org/wiki/DeWalt

    In April 2016, DeWalt created an Android-powered smartphone designed for building industry workers. It costs £379 ($544), is designed to survive a 2 m (6 ft 7 in) drop onto concrete, and has an operating range of −20 to 60 °C (−4 to 140 °F). [9]

  4. Airlock - Wikipedia

    en.wikipedia.org/wiki/Airlock

    An airlock on board the Space Shuttle. An airlock [a] is a room or compartment which permits passage between environments of differing atmospheric pressure or composition, while minimizing the changing of pressure or composition between the differing environments.

  5. Double dump valve - Wikipedia

    en.wikipedia.org/wiki/Double_dump_valve

    Double dump valves are used to discharge a flow of material while at the same time serving as an airlock transition point to preserve the pressure differential above and below the valve. This type of material handling valve is ideal for use with bulky or abrasive materials that would tend to jam or damage a rotary feeder.

  6. 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.

  7. James Hardress de Warrenne Waller - Wikipedia

    en.wikipedia.org/wiki/James_Hardress_de_Warrenne...

    Returning to Ireland, he developed a system of construction with lightweight concrete called Nofrango (meaning "no break") in the late 1920s. [4] Waller's first projects was at Foynes, County Limerick, building a pier using concrete filled hessian bags to create a deep-water jetty. [2]

  8. Quest Joint Airlock - Wikipedia

    en.wikipedia.org/wiki/Quest_Joint_Airlock

    The Quest Joint Airlock is the primary airlock for the International Space Station. Quest was designed to host spacewalks with both Extravehicular Mobility Unit (EMU) spacesuits and Orlan space suits. The airlock was launched on STS-104 on July 14, 2001. It was attached to the starboard CBM of the Unity during STS-104. The four external HP ...

  9. Nanoracks Bishop Airlock - Wikipedia

    en.wikipedia.org/wiki/Nanoracks_Bishop_Airlock

    The Nanoracks Bishop Airlock is a commercially funded airlock module launched to the International Space Station on SpaceX CRS-21 on 6 December 2020. [3] [4] It was berthed to the Tranquility module on 19 December 2020 by the Canadarm2. [5] The module was built by Nanoracks, Thales Alenia Space, and Boeing. [6]

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