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  2. Gravel road - Wikipedia

    en.wikipedia.org/wiki/Gravel_road

    A gravel road in Asikkala, Finland. A gravel road is a type of unpaved road surfaced with gravel that has been brought to the site from a quarry or stream bed.Gravel roads are common in less-developed nations, and also in the rural areas of developed nations such as Canada and the United States.

  3. Grading (earthworks) - Wikipedia

    en.wikipedia.org/wiki/Grading_(earthworks)

    Section through railway track and foundation showing the sub-grade. Grading in civil engineering and landscape architectural construction is the work of ensuring a level base, or one with a specified slope, [1] for a construction work such as a foundation, the base course for a road or a railway, or landscape and garden improvements, or surface drainage.

  4. Permeable paving - Wikipedia

    en.wikipedia.org/wiki/Permeable_paving

    Open-graded friction courses (OGFC) are a porous asphalt surface course used on highways to improve driving safety by removing water from the surface. These use an open-graded mix design for the top layer of asphalt. Unlike a full-depth porous asphalt pavement, OGFCs do not drain water to the base of a pavement.

  5. Road surface - Wikipedia

    en.wikipedia.org/wiki/Road_surface

    There also exists a research facility near Auburn University, the NCAT Pavement Test Track, that is used to test experimental asphalt pavements for durability. In addition to repair costs, the condition of a road surface has economic effects for road users. Rolling resistance increases on rough pavement, as does wear and tear of vehicle ...

  6. Grade (slope) - Wikipedia

    en.wikipedia.org/wiki/Grade_(slope)

    Grade indicator near Bellville, Western Cape, South Africa, showing 1:150 and 1:88 grades. Ruling gradients limit the load that a locomotive can haul, including the weight of the locomotive itself. Gradients are expressed as a ratio of vertical rise to horizontal distance; for example, a 1% gradient (1 in 100) means the track rises 1 vertical ...

  7. Aggregate industry in the United States - Wikipedia

    en.wikipedia.org/wiki/Aggregate_industry_in_the...

    As of 2023, there were about 3400 companies mining sand and gravel, [1] and 1400 mining crushed rock in the United States, [2] with many companies doing both. Top crushed rock companies as of 2015, in order of descending tonnage. The top ten companies provided 45 percent of the crushed rock produced in the US. [5] Rank Company 1. Martin ...

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