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  2. 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 ... (approx. inches) Aggregate name (Wentworth class) Other names <−8

  3. 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

  4. Gravel - Wikipedia

    en.wikipedia.org/wiki/Gravel

    Gravel is classified by particle size range and includes size classes from granule- to boulder-sized fragments. In the Udden-Wentworth scale gravel is categorized into granular gravel (2–4 mm or 0.079–0.157 in) and pebble gravel (4–64 mm or 0.2–2.5 in). ISO 14688 grades gravels as fine, medium, and coarse, with ranges 2–6.3 mm (0.079 ...

  5. 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 ...

  6. AASHTO Soil Classification System - Wikipedia

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

    A-3 A-2 A-4 A-5 A-6 A-7 A-1-a A-1-b A-2-4 A-2-5 A-2-6 A-2-7 A-7-5 A-7-6 ... stone fragments, gravel and sand fine sand silty or clayey gravel and sand

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  8. Proctor compaction test - Wikipedia

    en.wikipedia.org/wiki/Proctor_compaction_test

    The original Proctor test, ASTM D698 / AASHTO T99, uses a 4-inch-diameter (100 mm) by 4.584-inch-high (116.4 mm) mold which holds 1/30 cubic feet of soil, and calls for compaction of three separate lifts of soil using 25 blows by a 5.5 lb hammer falling 12 inches, for a compactive effort of 12,375 ft-lbf/ft 3. [3] [4] The "Modified Proctor ...

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