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ASTM International, 05/01/2012
Publisher: ASTM
File Format: PDF
$38.00$76.00
Published:01/05/2012
Pages:14
File Size:1 file , 340 KB
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1.1 These test methods cover laboratory compaction methods used to determine the relationship between molding water content and dry unit weight of soils (compaction curve) compacted in a 4- or 6-in. (101.6- or 152.4-mm) diameter mold with a 10.00-lbf. (44.48-N) rammer dropped from a height of 18.00 in. (457.2 mm) producing a compactive effort of 56 000 ft-lbf/ft3 (2700 kN-m/m³).
Note 1: The equipment and procedures are the same as proposed by the U.S. Corps of Engineers in 1945. The modified effort test (see 3.1.3) is sometimes referred to as the Modified Proctor Compaction Test.
1.1.1 Soils and soil-aggregate mixtures are to be regarded as natural occurring fine- or coarse-grained soils, or composites or mixtures of natural soils, or mixtures of natural and processed soils or aggregates such as gravel or crushed rock. Hereafter referred to as either soil or material.
1.2 These test methods apply only to soils (materials) that have 30 % or less by mass of their particles retained on the ³/4-in. (19.0-mm) sieve and have not been previously compacted in the laboratory; that is, do not reuse compacted soil.
1.2.1 For relationships between unit weights and molding water contents of soils with 30 % or less by weight of material retained on the ³/4-in. (19.0-mm) sieve to unit weights and molding water contents of the fraction passing the ³/4-in. (19.0-mm) sieve, see Practice D4718.
1.3 Three alternative methods are provided. The method used shall be as indicated in the specification for the material being tested. If no method is specified, the choice should be based on the material gradation.
1.3.1 Method A:
1.3.1.1 Mold-4-in. (101.6-mm) diameter.
1.3.1.2 Material-Passing No. 4 (4.75-mm) sieve.
1.3.1.3 Layers-Five.
1.3.1.4 Blows per layer-25.
1.3.1.5 Usage-May be used if 25 % or less by mass of the material is retained on the No. 4 (4.75-mm) sieve. However, if 5 to 25 % by mass of the material is retained on the No. 4 (4.75-mm) sieve, Method A can be used but oversize corrections will be required (See 1.4) and there are no advantages to using Method A in this case.
1.3.1.6 Other Use-If this gradation requirement cannot be met, then Methods B or C may be used.
1.3.2 Method B:
1.3.2.1 Mold-4-in. (101.6-mm) diameter.
1.3.2.2 Material-Passing ³/8-in. (9.5-mm) sieve.
1.3.2.3 Layers-Five.
1.3.2.4 Blows per layer-25.
1.3.2.5 Usage-May be used if 25 % or less by mass of the material is retained on the ³/8-in. (9.5-mm) sieve. However, if 5 to 25 % of the material is retained on the ³/8-in. (9.5-mm) sieve, Method B can be used but oversize corrections will be required (See 1.4). In this case, the only advantages to using Method B rather than Method C are that a smaller amount of sample is needed and the smaller mold is easier to use.
1.3.2.6 Other Usage-If this gradation requirement cannot be met, then Method C may be used.
1.3.3 Method C:
1.3.3.1 Mold-6-in. (152.4-mm) diameter.
1.3.3.2 Material-Passing ³/4-in. (19.0-mm) sieve.
1.3.3.3 Layers-Five.
1.3.3.4 Blows per layer-56.
1.3.3.5 Usage-May be used if 30 % or less (see 1.4) by mass of the material is retained on the ³/4-in. (19.0-mm) sieve.
1.3.4 The 6-in. (152.4-mm) diameter mold shall not be used with Method A or B.
Note 2: Results have been found to vary slightly when a material is tested at the same compactive effort in different size molds, with the smaller mold size typically yielding larger values of unit weight and density (1).2
1.4 If the test specimen contains more than 5 % by mass of oversize fraction (coarse fraction) and the material will not be included in the test, corrections must be made to the unit weight and molding water content of the test specimen or to the appropriate field in-place unit weight (or density) test specimen using Practice D4718.
1.5 This test method will generally produce a well-defined maximum dry unit weight for non-free draining soils. If this test method i
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