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  2. Expansion joint - Wikipedia

    en.wikipedia.org/wiki/Expansion_joint

    Control joints, or contraction joints, are sometimes confused with expansion joints, but have a different purpose and function. Concrete and asphalt have relatively weak tensile strength, and typically form random cracks as they age, shrink, and are exposed to environmental stresses (including stresses of thermal expansion and contraction).

  3. Rebar - Wikipedia

    en.wikipedia.org/wiki/Rebar

    Rebar (short for reinforcement bar or reinforcing bar), known when massed as reinforcing steel or steel reinforcement, [1] is a tension device added to concrete to form reinforced concrete and reinforced masonry structures to strengthen and aid the concrete under tension. Concrete is strong under compression, but has low tensile strength.

  4. Norma Group - Wikipedia

    en.wikipedia.org/wiki/Norma_Group

    Norma Group SE (often written as NORMA) is a German manufacturer of machine joining components, such as hose couplings, clamps and quick connectors. [ 1 ] [ 2 ] The company's products are used in industries such as automotive, aviation, construction and shipping, and for purposes such as cooling, emission outputs, hoses, water pipes and sterile ...

  5. Anchorage in reinforced concrete - Wikipedia

    en.wikipedia.org/wiki/Anchorage_in_Reinforced...

    Conventionally the term concrete refers only to concrete that is reinforced with iron or steel. However, other materials are often used to reinforce concrete e.g. organic and inorganic fibres, composites in different forms. While compared to its compressive strength, concrete is weak in tension. Thus adding reinforcement increases the strength ...

  6. Rebar spacer - Wikipedia

    en.wikipedia.org/wiki/Rebar_spacer

    The engineering study of every reinforced concrete construction, whether it is a building, a bridge, a bearing wall, or another structure, dictates the positioning of steel rebars at specific positions in the volume of concrete (predicted concrete cover of steel reinforcement bars). This cover varies between 10 mm and 100 mm.

  7. Waterstop - Wikipedia

    en.wikipedia.org/wiki/Waterstop

    Hydrophobic Polymer waterstops such as PVC, PE, TPV, or rubber are supplied to the construction site in coils (usually 25 m long), and are generally anywhere from 120 mm to 320 mm wide in a variety of profiles that are designed to simultaneously provide an interlock with the concrete they are installed in and to provide for a limited amount of ...

  8. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    A union also connects two pipes but is quite different from a coupling, as it allows future disconnection of the pipes for maintenance. In contrast to a coupling requiring solvent welding, soldering, or rotation (for threaded couplings), a union allows easy connection and disconnection multiple times if needed. It consists of three parts: a nut ...

  9. Coupling (piping) - Wikipedia

    en.wikipedia.org/wiki/Coupling_(piping)

    Pipe coupling (copper sweat) In piping and plumbing , a coupling (or coupler ) is a very short length of pipe or tube , with a socket at one or both ends that allows two pipes or tubes to be joined, welded ( steel ), brazed or soldered ( copper , brass etc.) together.

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