ASTM_D_5333_-_03.pdf

Designation:D 5333 03Standard Test Method forMeasurement of Collapse Potential of Soils1This standard is issued under the fixed designation D 5333;the number immediately following the designation indicates the year 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(e)indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the mag-nitude of one-dimensional collapse that occurs when unsatur-ated soils are inundated with fluid.1.2 This test method may be used to determine the magni-tude of potential collapse that may occur for a given vertical(axial)stress and an index for rating the potential for collapse.1.3 This test method specifies the technique for specimenpreparation,apparatus,and procedure for quantifying theamount of height change associated with collapse and proce-dures for reporting test results.1.4 The procedures given in this test method are applicableto both undisturbed and remolded specimens.1.5 The values stated in SI units are to be regarded as thestandard.The inch-pound units given in parentheses are forinformation only.1.6 The values stated in SI units are to be regarded as thestandard.The inch-pound units given in parentheses are forinformation only.1.6.11.7 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 653 Terminology Relating to Soil,Rock,and ContainedFluids2D 2216 Test Method for Laboratory Determination of Water(Moisture)Content of Soil and Rock2D 2435 Test Method for One-Dimensional ConsolidationProperties of Soils2D 3740 Practice for Evaluation of Agencies Engaged in theTesting and/or Inspection of Soil and Rock as Used inEngineering Design and Construction2D 4829 Test Method for Expansion Index of Soils2D 6026 Pratice for Using Significant Digits in Calculatingand Reporting Geotechnical Test Data33.Terminology3.1 Refer to Terminology D 653 for standard definitions ofterms.Additional terms are as follows:3.2 Definitions of Terms Specific to This Standard:3.2.1 collapsedecrease in height of a confined soil fol-lowing wetting at a constant applied vertical stress.A collaps-ible soil may withstand relatively large applied vertical stresswith small settlement while at a low water content,but this soilwill exhibit settlement(that could be large)after wetting withno additional increase in stress.Large applied vertical stress isnot necessary for collapse.3.2.2 collapse index(Ie),percentrelative magnitude ofcollapse determined at 200 kPa(2 tsf)and calculated using(Eq1).3.2.3 collapse potential(Ic),percentrelative magnitude ofsoil collapse determined at any stress level as follows:Ic5Fdf2 doho2di2 dohoG100 5Fdf2 dihoG100(1)where:d=dial reading,mm(in.),do=dial reading at seating stress,mm(in.),ho=initial specimen height,mm(in.),df=dial reading at the appropriate stress levelafter wetting,mm(in.),di=dial reading at the appropriate stress levelbefore wetting,mm(in.),(df do)/ho=strain at the appropriate stress level afterwetting,and(di do)/ho=strain at the appropriate stress level beforewetting.Eq 1 may be rewritten in terms of void ratio:Ic5De1 1 eo100(2)where:De=change in void ratio resulting from wetting,andeo=initial void ratio.or,since the test is conducted as a one-dimensional test:1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.05 on StructuralProperties of Soils.Current edition approved Jan.10,2003.Published March 2003.Originally approved in 1992.Last previous edition approved in 1996 asD 533392(1996).2Annual Book of ASTM Standards,Vol 04.08.3Annual Book of ASTM Standards,Vol 04.09.1*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.Ic5Dhho 100(3)where:Dh=change in specimen height resulting from wetting,mm(in.)andho=initial specimen height,mm(in.).4.Summary of Test Method4.1 The test method consists of placing a soil specimen atnatural water content in a consolidometer,applying a prede-termined applied vertical stress to the specimen and inundatingthe specimen with fluid to induce the potential collapse in thesoil specimen.The fluid shall be distilled-deionized waterwhen evaluating the collapse index,Ie.The fluid may simulatepore water of the specimen or other field condition as necessarywhen evaluating collapse potential,Ic.5.Significance and Use5.1 Collapsible soils occur widely in the United States andworldwide.Collapsible soils are typified by low values of dryunit weight and natural water content.Engineering worksfounded on collapsible so