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  2. Subbase (pavement) - Wikipedia

    en.wikipedia.org/wiki/Subbase_(pavement)

    Unbound granular materials are usually crushed stone, [3] crushed slag or concrete, or slate. Cement-bound materials come in multiple types. Mass concrete is used where exceptional loads are expected, with thickness usually 100 to 150 millimetres (4 to 6 in ), and optional reinforcement with steel mesh or polymer fibers.

  3. California bearing ratio - Wikipedia

    en.wikipedia.org/wiki/California_bearing_ratio

    The CBR is expressed as a percentage of the actual load causing the penetrations of 2.5 mm or 5.0 mm to the standard loads on crushed stone. A load penetration curve is drawn. The load values on standard crushed stones are 1,370 kgf (13.44 kN) and 2,055 kgf (20.15 kN) at 2.5 mm and 5.0 mm penetrations respectively. [citation needed]

  4. Granular base equivalency - Wikipedia

    en.wikipedia.org/wiki/Granular_base_equivalency

    Here is an example of GBE calculation adopted from Piryonesi (2019). [1] This example belongs to a road in the LTPP database. This road is made of the following layers: subbase, base, and three layers of hot mixed asphalt concrete.

  5. Unified Soil Classification System - Wikipedia

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

    gravel > 50% of coarse fraction retained on No.4 (4.75 mm) sieve clean gravel <5% smaller than No.200 Sieve GW well-graded gravel, fine to coarse gravel GP poorly graded gravel gravel with >12% fines GM silty gravel GC clayey gravel sand ≥ 50% of coarse fraction passes No.4 (4.75 mm) sieve clean sand SW well-graded sand, fine to coarse sand SP

  6. Aggregate base - Wikipedia

    en.wikipedia.org/wiki/Aggregate_base

    Class 3 road base. Aggregate base is a construction aggregate typically composed of crushed rock capable of passing through a 20 millimetres (34 in) rock screen. The component particles will vary in size from 20 mm down to dust. The material can be made of virgin (newly mined) rock, or of recycled asphalt and concrete.

  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 ...

  8. Grain size - Wikipedia

    en.wikipedia.org/wiki/Grain_size

    Coarse gravel Pebble −3 to −4 8–16 mm 0.31–0.63 in Medium gravel Pebble ... 4 to 3 62.5–125 μm 0.0025–0.0049 in Very fine sand 8 to 4

  9. Base course - Wikipedia

    en.wikipedia.org/wiki/Base_course

    Aggregate base (AB) is typically a mix of different sizes of crushed rock 20 mm or 34 in Aggregate Base, Class 2, is used in roadways and consists of rock particles of size 20 mm (34 in) and less. An aggregate is normally made from newly quarried rock, or it is sometimes allowed to be made from recycled asphalt concrete and/or ...

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