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  2. Grain size - Wikipedia

    en.wikipedia.org/wiki/Grain_size

    Granular material can range from very small colloidal particles, through clay, silt, ... Coarse gravel Pebble −3 to −4 8–16 mm 0.31–0.63 in Medium gravel

  3. Unified Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/Unified_Soil...

    For example, GW-GM corresponds to "well-graded gravel with silt." If the soil has more than 15% by weight retained on a #4 sieve (R #4 > 15%), there is a significant amount of gravel, and the suffix "with gravel" may be added to the group name, but the group symbol does not change. For example, SP-SM could refer to "poorly graded SAND with silt ...

  4. AASHTO Soil Classification System - Wikipedia

    en.wikipedia.org/wiki/AASHTO_Soil_Classification...

    Granular Materials (35% or less passing the 0.075 mm (No. 200) sieve) ... Usual types of significant constituent materials stone fragments, gravel and sand fine sand

  5. Soil gradation - Wikipedia

    en.wikipedia.org/wiki/Soil_Gradation

    A poorly-graded soil is a soil that does not have a good representation of all sizes of particles from the no. 4 to no. 200 sieve. A poorly-graded gravel is classified as GP, while a poorly-graded sand is classified as SP. Poorly-graded soils are more susceptible to soil liquefaction than well-graded soils. [1]

  6. Gravel - Wikipedia

    en.wikipedia.org/wiki/Gravel

    Gravel is a major basic raw material in construction. [24] Sand is not usually distinguished from gravel in official statistics, but crushed stone is treated as a separate category. In 2020, sand and gravel together made up 23% of all industrial mineral production in the U.S., with a total value of about $12.6 billion.

  7. Sieve analysis - Wikipedia

    en.wikipedia.org/wiki/Sieve_analysis

    A sieve analysis (or gradation test) is a practice or procedure used in geology, civil engineering, [1] and chemical engineering [2] to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction ...

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  9. Permeability (materials science) - Wikipedia

    en.wikipedia.org/wiki/Permeability_(Materials...

    Unconsolidated sand and gravel Well sorted gravel: Well sorted sand or sand and gravel Very fine sand, silt, loess, loam: Unconsolidated clay and organic Peat: Layered clay: Unweathered clay Consolidated rocks Highly fractured rocks Oil reservoir rocks Fresh sandstone: Fresh limestone, dolomite: Fresh granite: k (cm 2) 0.001 0.0001 10 −5: 10 ...