1、Designation:D776018Standard Test Method forMeasurement of Hydraulic Conductivity of Materials Derivedfrom Scrap Tires Using a Rigid Wall Permeameter1This standard is issued under the fixed designation D7760;the number immediately following the designation indicates the year oforiginal adoption or,in
2、 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 laboratory measurement of thehydraulic conductivity(also referred
3、 to as coeffcient of per-meability)of water-saturated samples obtained from materialsderived from scrap tires using a rigid-wall permeameter.Thescrap tire materials covered in this method include tire chips,tire shreds,and tire derived aggregate(TDA)as described inPractice D6270 with particle sizes
4、ranging from approximately12 to 305 mm.Whole scrap tires are not included in thisstandard.A clear trend between hydraulic conductivity andshred size has not been established at a given vertical pressurefor shreds 50 mm(1).21.2 A single-or dual-ring permeameter may be used in thetests.A dual-ring per
5、meameter may be preferred over asingle-ring permeameter to take into account and preventshort-circuiting of permeant along the sidewalls of the per-meameter.The effects of sidewall flow is more significant athigh stresses and when the cell diameter is less than 6 times theparticle size(1).1.3 The te
6、st method is used under constant head conditions.1.4 Water is used as the permeant with the test method.1.5 Test Method D2434 also can be used for determinationof hydraulic conductivity of materials derived from scrap tireswith sizes smaller than 19 mm under constant head conditionsin a rigid-wall p
7、ermeameter.Method D2434 includes the use ofa permeameter with a single ring.1.6 The values stated in SI units are to be regarded as thestandard.Hydraulic conductivity has traditionally been ex-pressed in cm/s in the US,even though the official SI unit forhydraulic conductivity is m/s.1.7 This standa
8、rd 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.8 This internatio
9、nal standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee
10、.2.Referenced Documents2.1 ASTM Standards:3D653 Terminology Relating to Soil,Rock,and ContainedFluidsD2434 Test Method for Permeability of Granular Soils(Constant Head)(Withdrawn 2015)4D3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in
11、 Engineering Design and ConstructionD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses for Use in Soil,Rock,andConstruction Materials TestingD6026 Practice for Using Significant Digits in GeotechnicalDataD6270 Practice for Use of Scrap Tires in Civil EngineeringApplica
12、tions3.Terminology3.1 Definitions:3.1.1 For common definitions of terms in this standard,referto Terminology D653.3.1.2 For definitions of terms related to scrap tires,refer toPractice D6270.3.1.3 hydraulic conductivity,k(also referred to as coeff-cient of permeability or permeability)the rate of di
13、scharge of1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.14 on Geotechnics ofSustainable Construction.Current edition approved Jan.1,2018.Published February 2018.Originallyapproved in 2012.Last previous edition ap
14、proved in 2012 as D776012.DOI:10.1520/D776018.2The boldface numbers in parentheses refer to a list of references at the end ofthis standard.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume in
15、formation,refer to the standards Document Summary page onthe ASTM website.4The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was de
16、veloped in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 water under laminar flow conditions through a unit cross-sectional area of porous medium under a unit hydraulicgradient and standard temperature conditions(20 C).3.1.4 hydraulic gradient,ithe change in total head(headl
