1、Designation:D738208Standard Test Methods forDetermination of Maximum Dry Unit Weight and WaterContent Range for Effective Compaction of Granular SoilsUsing a Vibrating Hammer1This standard is issued under the fixed designation D7382;the number immediately following the designation indicates the year
2、 oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 These test methods cover the determination of themaximum dry u
3、nit weight and water content range for effectivecompaction of granular soils.A vibrating hammer is used toimpart a surcharge and compactive effort to the soil specimen.1.2 These test methods apply to soils with up to 35%,bydry mass,passing a No.200(75-m)sieve if the portionpassing the No.40(425-m)si
4、eve is nonplastic.1.3 These test methods apply to soils with up to 15%,bydry mass,passing a No.200(75-m)sieve if the portionpassing the No.40(425-m)sieve exhibits plastic behavior.1.4 These test methods apply to soils in which 100%,bydry mass,passes the 2-in.(50-mm)sieve.1.5 These test methods apply
5、 only to soils(materials)thathave 30%or less,by dry mass of their particles retained on the34-in.(19.0-mm)sieve.NOTE1For relationships between unit weights and water contents ofsoils with 30%or less,by dry mass,of material retained on the34-in.(19.0-mm)sieve to unit weights and water contents of the
6、 fraction passingthe34-in.(19.0-mm)sieve,see Practice D4718.1.6 These test methods will typically produce a highermaximum dry density/unit weight for the soils specified in 1.2and 1.3 than that obtained by impact compaction in which awell-defined moisture-density relationship is not apparent.However
7、,for some soils containing more than 15%fines,theuse of impact compaction(Test Methods D698 or D1557)maybe useful in evaluating what is an appropriate maximum indexdensity/unit weight.1.7 Two alternative test methods are provided,with thevariation being in mold size.The method used shall be asindica
8、ted in the specification for the material being tested.If nomethod is specified,the choice should be based on themaximum particle size of the material.1.7.1 Method A:1.7.1.1 Mold6-in.(152.4-mm)diameter.1.7.1.2 MaterialPassing34-in.(19.0-mm)sieve and con-sistent with the requirements of 1.2 and 1.3.1
9、.7.1.3 LayersThree.1.7.1.4 Time of Compaction per layer60 6 5 s.1.7.2 Method B:1.7.2.1 Mold11-in.(279.4-mm)diameter.1.7.2.2 MaterialPassing 2-in.(50-mm)sieve and consis-tent with the requirements of 1.2 and 1.3.1.7.2.3 LayersThree.1.7.2.4 Time of Compaction per layer52 6 5 s at each of8 locations.NO
10、TE2Method A(with the correction procedure of Practice D4718,if appropriate),has been shown(reference thesis or paper)to provideconsistent results with Method B.Therefore,for ease of operations,it ishighly recommended to use Method A,unless Method B is required dueto soil gradations not meeting Pract
11、ice D4718.NOTE3Results have been found to vary slightly when a material istested at the same compaction effort in different size molds.1.7.3 Either method,A or B,can be performed with thematerial in an oven-dried or wet/saturated state,whicheverprovides the maximum dry unit weight.1.8 If the test sp
12、ecimen contains more than 5%by mass ofoversize fraction(coarse fraction)and the material will not beincluded in the test,corrections must be made to the unitweight and water content of the test specimen or to theappropriate field in-place density test specimen using PracticeD4718.1.9 This test metho
13、d causes a minimal amount of degrada-tion(particle breakdown)of the soil.When degradation occurs,typically there is an increase in the maximum unit weightobtained,and comparable test results may not be obtainedwhen different size molds are used to test a given soil.For soilswhere degradation is susp
14、ected,a sieve analysis of the speci-men should be performed before and after the compaction testto determine the amount of degradation.1.10 UnitsThe values stated in either SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equival
15、ents;1These test methods are under the jurisdiction ofASTM Committee D18 on Soiland Rock and are the direct responsibility of Subcommittee D18.03 on Texture,Plasticity and Density Characteristics of Soils.Current edition approved Nov.1,2008.Published November 2008.Originallyapproved in 2007.Last pre
16、vious edition approved in 2007 as D7382 07.DOI:10.1520/D7382-08.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.1.11 The vibrating hammer test method may be performedin the field or in the laboratory.1.12 This standard does
