Designation: D 1557 – 02 e1 Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft 3 (2,700 kN-m/m 3 )) 1 This standard is issued under the fixed designation D 1557; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. e 1 NOTE—Paragraph 10.4.3 was corrected editorially in November 2003. 1. Scope* 1.1 These test methods cover laboratory compaction meth- ods used to determine the relationship between 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-lbf. (44.5-N) rammer dropped from a height of 18 in. (457 mm) producing a compactive effort of 56,000 ft-lbf/ft 3 (2,700 kN-m/m 3 ). NOTE 1—Soils and soil-aggregate mixtures should 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 silt, gravel, or crushed rock. NOTE 2—The equipment and procedures are the same as proposed by the U.S. Corps of Engineers in 1945. The modified effort test (see 3.2.2) is sometimes referred to as the Modified Proctor Compaction Test. 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. NOTE 3—For relationships between unit weights and 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 water contents of the fraction passing the 3 /4-in. (19.0-mm) sieve, see Practice D 4718. 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 Use—May be used if 20 % or less by mass of the material is retained on the No. 4 (4.75-mm) sieve. 1.3.1.6 Other Use—If this method is not specified, materials that meet these gradation requirements may be tested using Methods B or C. 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 Use—Shall be used if more than 20 % by mass of the material is retained on the No. 4 (4.75-mm) sieve and 20 % or less by mass of the material is retained on the 3 /8-in. (9.5-mm) sieve. 1.3.2.6 Other Use—If this method is not specified, materials that meet these gradation requirements may be tested using Method C. 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 Use—Shall be used if more than 20 % by mass of the material is retained on the 3 /8-in. (9.53-mm) sieve and less than 30 % 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 4—Results have been found to vary slightly when a material is tested at the same compactive effort in different size molds. 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 water content of the test specimen or to the appropriate field in place density test specimen using Practice D 4718. 1.5 This test method will generally produce well defined maximum dry unit weight for non-free draining soils. If this test method is used for free draining soils the maximum unit 1 This standard is under the jurisdiction of ASTM Committee D18 on Soil and Rock and is the direct responsibility of Subcommittee D18.03 on Texture, Plasticity and Density Characteristics of Soils. Current edition approved Nov. 10, 2002. Published January 2003. Originally published as D 1557 – 58. Last previous edition D 1557 – 00. 1 *A Summary of Changes section appears at the end of this standard. Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.