1、Designation:D652700(2008)Standard Test Method forDetermining Unsaturated and Saturated HydraulicConductivity in Porous Media by Steady-StateCentrifugation1This standard is issued under the fixed designation D6527;the number immediately following the designation indicates the year oforiginal adoption
2、 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.Scope1.1 This test method covers the determination of the hy-draulic conductivity,or the per
3、meability relative to water,ofany porous medium in the laboratory,in particular,the hydrau-lic conductivity for water in subsurface materials,for example,soil,sediment,rock,concrete,and ceramic,either natural orartificial,especially in relatively impermeable materials ormaterials under highly unsatu
4、rated conditions.This testmethod covers determination of these properties using anyform of steady-state centrifugation(SSC)in which fluid can beapplied to a specimen with a constant flux or steady flowduring centrifugation of the specimen.This test method onlymeasures advective flow on core specimen
5、s in the laboratory.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associa
6、ted with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D420 Guide to Site Characterization for Engineering Designand Co
7、nstruction Purposes(Withdrawn 2011)3D653 Terminology Relating to Soil,Rock,and ContainedFluidsD2216 Test Methods for Laboratory Determination of Water(Moisture)Content of Soil and Rock by MassD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock as
8、Used in Engineering Design and ConstructionD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses for Use in Soil,Rock,andConstruction Materials TestingD5084 Test Methods for Measurement of Hydraulic Con-ductivity of Saturated Porous Materials Using a FlexibleWall Permeame
9、terD5730 Guide for Site Characterization for EnvironmentalPurposes With Emphasis on Soil,Rock,the Vadose Zoneand Groundwater(Withdrawn 2013)3D6026 Practice for Using Significant Digits in GeotechnicalData3.Terminology3.1 Definitions:For common definitions of terms in thisguide,such as porosity,perme
10、ability,hydraulic conductivity,water content,and matric potential(matric suction,watersuction,or water potential),refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 hydraulic steady statethe condition in which thewater flux density remains constant along the conductin
11、gsystem.This is diagnosed as the point at which both the massand volumetric water contents of the material are no longerchanging.3.2.2 SSCM or SSC-UFAApparatus to achieve steady-state centrifugation.The SSCM(steady-state centrifugationmethod)uses a self-contained flow delivery-specimen system(1).4Th
12、e SSC-UFA(unsaturated flow apparatus)uses anexternal pump to deliver flow to the rotating specimen(2).Thistest method will describe the SSC-UFA application,but otherapplications are possible.Specific parts for the SSC-UFA aredescribed in Section 6 as an example of a SSC system.3.2.3 steady-state cen
13、trifugationcontrolled flow of wateror other fluid through a specimen while it is rotating in a1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.04 on HydrologicProperties and Hydraulic Barriers.Current edition approv
14、ed Sept.15,2008.Published November 2008.Originallyapproved in 2000.Last previous edition approved in 2000 as D6527 2000.DOI:10.1520/D6527-00R08.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volum
15、e information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4The boldface numbers in parentheses refer to the list of references at the end ofthis standard.Copyright ASTM International,100 Barr Harb
16、or Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 centrifuge,as distinct from water retention centrifugationmethods which measure drainage from a wet specimen bycentrifugation with no flow into the specimen.3.2.4 water flux densitythe flow rate of water through across-sectional area per unit time,for example,5 cm3/cm2/s,written as 5 cm/s.3.3 Symbols:K=hydraulic conductivity,cm/sq=water flux density,cm3/cm2/s or cm/sr=distance from axis of rotation,cm=dry density,g/cm3=rotation