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  2. California bearing ratio - Wikipedia

    en.wikipedia.org/wiki/California_bearing_ratio

    The CBR test is a penetration test in which a standard piston, with a diameter of 50 mm (1.969 in), is used to penetrate the soil at a standard rate of 1.25 mm/minute. Although the force increases with the depth of penetration, in most cases, it does not increase as quickly as it does for the standard crushed rock, so the ratio decreases.

  3. Asphalt concrete - Wikipedia

    en.wikipedia.org/wiki/Asphalt_concrete

    Asphalt batch mix plant A machine laying asphalt concrete, fed from a dump truck. Asphalt concrete (commonly called asphalt, [1] blacktop, or pavement in North America, and tarmac or bitumen macadam in the United Kingdom and the Republic of Ireland) is a composite material commonly used to surface roads, parking lots, airports, and the core of embankment dams. [2]

  4. International roughness index - Wikipedia

    en.wikipedia.org/wiki/International_roughness_index

    [1] [2] Although a universal term, IRI is calculated per wheelpath, but can be expanded to a Mean Roughness Index (MRI) when both wheelpath profiles are collected. This performance measure has less stochasticity and subjectivity in comparison to other pavement performance indicators , such as PCI , but it is not completely devoid of randomness ...

  5. Bitumen - Wikipedia

    en.wikipedia.org/wiki/Bitumen

    The total amount of crude bitumen in Alberta that could be extracted is estimated to be about 310 billion barrels (50 × 10 ^ 9 m 3), [10] which at a rate of 4,400,000 barrels per day (700,000 m 3 /d) would last about 200 years.

  6. Road surface - Wikipedia

    en.wikipedia.org/wiki/Road_surface

    Cold mix asphalt is often used on lower-volume rural roads, where hot mix asphalt would cool too much on the long trip from the asphalt plant to the construction site. [ 18 ] An asphalt concrete surface will generally be constructed for high-volume primary highways having an average annual daily traffic load greater than 1,200 vehicles per day ...

  7. Pavement condition index - Wikipedia

    en.wikipedia.org/wiki/Pavement_Condition_Index

    The pavement condition index (PCI) is a numerical index between 0 and 100, which is used to indicate the general condition of a pavement section.The PCI is widely used in transportation civil engineering [1] and asset management, and many municipalities use it to measure the performance of their road infrastructure and their levels of service. [2]

  8. Asphaltite - Wikipedia

    en.wikipedia.org/wiki/Asphaltite

    Asphaltite (also known as uintahite, asphaltum, gilsonite or oil sands [1]) is a naturally occurring soluble solid hydrocarbon, a form of asphalt [2] (or bitumen) with a relatively high melting temperature. Its large-scale production occurs in the Uintah Basin of Utah and Colorado, United States.

  9. Asphalt - Wikipedia

    en.wikipedia.org/wiki/Asphalt

    Asphalt most often refers to: Bitumen , also known as "liquid asphalt cement" or simply "asphalt", a viscous form of petroleum mainly used as a binder in asphalt concrete Asphalt concrete , a mixture of bitumen with coarse and fine aggregates, used as a road surface