ASTM_D_5335_-_14.pdf

Designation:D533514Standard Test Method forLinear Coefficient of Thermal Expansion of Rock UsingBonded Electric Resistance Strain Gauges1This standard is issued under the fixed designation D5335;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()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the laboratory determination ofthe linear(one-dimensional)coefficient of thermal expansionof rock using bonded electric resistance strain gauges.This testmethod is intended for evaluation of intact rock cores.Discon-tinuities in the rock mass,such as joints,inclusions,voids,veins,bedding,and the like can influence the thermal expan-sion of the rock,and judgment should be used when selectingthe specimen to be analyzed in this test method.1.2 This test method is applicable for unconfined stressstates over the temperature range from 20 to 260C.NOTE1Unconfined tests performed at elevated temperatures mayalter the mineralogy or grain structure of the test specimen.This alterationmay change the physical and thermal properties of the test specimen.NOTE2The strain gauges are mounted with epoxy.Most commer-cially available high temperature epoxies require elevated temperaturecuring.The elevated temperature required for this curing may alter thephysical and thermal properties of the test specimen.Epoxy should beselected based upon the maximum expected test temperature.Roomtemperature curing epoxy should be used whenever practical.1.3 The test specimens may be either saturated,dry orunsaturated.If saturated or unsaturated specimens are used,then the test temperature shall be at least 10C less than theboiling point of the saturating fluid in order to reduce theeffects of evaporation of the fluid.NOTE3When testing a saturated specimen,the gravimetric watercontent of the specimen may change unless special precautions are takento encapsulate the test specimen.Refer to 7.4.1.4 UnitsThe values stated in SI units are to be regardedas the standard.No other units of measurement are included inthis standard.1.5 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.5.1 The procedure used to specify how data are collected/recorded or calculated in this standard are regarded as theindustry standard.In addition,they are representative of thesignificant digits that generally should be retained.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies,or any consider-ations for the users objectives;and it is common practice toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analyticalmethods for engineering design.1.6 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 requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD2113 Practice for Rock Core Drilling and Sampling ofRock for Site InvestigationD2216 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 asUsed in Engineering Design and ConstructionD6026 Practice for Using Significant Digits in GeotechnicalDataE83 Practice for Verification and Classification of Exten-someter SystemsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessE228 Test Method for Linear Thermal Expansion of SolidMaterials With a Push-Rod DilatometerE289 Test Method for Linear Thermal Expansion of RigidSolids with Interferometry1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.12 on Rock Mechanics.Current edition approved June 1,2014.Published July 2014.Originally approvedin 1992.Last previous edition approved in 2008 as D5335 08.DOI:10.1520/D5335-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*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 3.Terminology3.1 DefinitionsFor definitions of common technical terms,refer to Terminology D653.3.2 Definitions of Terms S