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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. Impervious surface - Wikipedia

    en.wikipedia.org/wiki/Impervious_surface

    Parking lots are highly impervious.. Impervious surfaces are mainly artificial structures—such as pavements (roads, sidewalks, driveways and parking lots, as well as industrial areas such as airports, ports and logistics and distribution centres, all of which use considerable paved areas) that are covered by water-resistant materials such as asphalt, concrete, brick, stone—and rooftops.

  4. Standard penetration test - Wikipedia

    en.wikipedia.org/wiki/Standard_penetration_test

    The sample tube is driven a total of 45 cm into the ground and the number of blows needed for the tube to penetrate each 15 cm (6 in) interval up to a depth of 45 cm (18 in) is recorded. The sum of the number of blows required for the second and third 15 cm (6 in) intervals of penetration is termed the "standard penetration resistance" or the ...

  5. Bearing capacity - Wikipedia

    en.wikipedia.org/wiki/Bearing_capacity

    The bearing capacity of soil is the maximum average contact pressure between the foundation and the soil which should not produce shear failure in the soil. Ultimate bearing capacity is the theoretical maximum pressure which can be supported without failure; allowable bearing capacity is the ultimate bearing capacity divided by a factor of safety.

  6. How Cities Are Using Nature-Based Solutions to Tackle Floods

    www.aol.com/news/cities-using-nature-based...

    Surface water flooding is especially dangerous for cities with a high proportion of impervious soil coverage and hard surfaces—such as roads and parking lots—that prevent rainwater from being ...

  7. International roughness index - Wikipedia

    en.wikipedia.org/wiki/International_roughness_index

    The difference between the two is the relative elevation profile of the road. This elevation profile is then processed through the quarter-car algorithm to obtain the IRI. The most common approaches see the IRI measured in each wheelpath. The two wheelpath IRIs need to be combined to obtain the overall IRI "roughness profile". [19] for the lane ...

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. How Did Tamales Become a Christmas Tradition? - AOL

    www.aol.com/did-tamales-become-christmas...

    It’s tamale time. This Mexican comfort food has a long history and is an essential part of every major holiday, particularly Christmas. It’s also the perfect portable snack for holiday travelers.

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