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  2. 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

  3. Hudson's equation - Wikipedia

    en.wikipedia.org/wiki/Hudson's_equation

    Hudson's equation, also known as Hudson formula, is an equation used by coastal engineers to calculate the minimum size of riprap (armourstone) required to provide satisfactory stability characteristics for rubble structures such as breakwaters under attack from storm wave conditions.

  4. Three-point flexural test - Wikipedia

    en.wikipedia.org/wiki/Three-point_flexural_test

    1940s flexural test machinery working on a sample of concrete Test fixture on universal testing machine for three-point flex test. The three-point bending flexural test provides values for the modulus of elasticity in bending, flexural stress, flexural strain and the flexural stress–strain response of the material.

  5. Rubberized asphalt - Wikipedia

    en.wikipedia.org/wiki/Rubberized_asphalt

    Asphalt rubber is the largest single market for ground rubber in the United States, consuming an estimated 220,000,000 pounds (100,000,000 kg), or approximately 12 million tires annually. [1] Use of rubberized asphalt as a pavement material was pioneered by the city of Phoenix, Arizona in the 1960s because of its high durability. [2]

  6. 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]

  7. Rubber elasticity - Wikipedia

    en.wikipedia.org/wiki/Rubber_elasticity

    Rubber elasticity is the ability of solid rubber to be stretched up to a factor of 10 from its original length, and return to close to its original length upon release. This process can be repeated many times with no apparent degradation to the rubber. [1] Rubber, like all materials, consists of molecules.

  8. Mohr–Coulomb theory - Wikipedia

    en.wikipedia.org/wiki/Mohr–Coulomb_theory

    Mohr–Coulomb theory is a mathematical model (see yield surface) describing the response of brittle materials such as concrete, or rubble piles, to shear stress as well as normal stress. Most of the classical engineering materials follow this rule in at least a portion of their shear failure envelope.

  9. 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 ...

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