ASTM_D_6760_-_14.pdf

Designation:D676014Standard Test Method forIntegrity Testing of Concrete Deep Foundations byUltrasonic Crosshole Testing1This standard is issued under the fixed designation D6760;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.Scope1.1 This test method covers procedures for checking thehomogeneity and integrity of concrete in deep foundation suchas bored piles,drilled shafts,concrete piles or augercast piles.This method can also be extended to diaphragm walls,barrettes,dams etc.In this test method,all the above will bedesignated“deep foundation elements.”The test measures thepropagation time and relative energy of an ultrasonic pulsebetween parallel access ducts(crosshole)or in a single tube(single hole)installed in the deep foundation element.Thismethod is most applicable when performed in tubes that areinstalled during construction.1.2 Similar techniques with different excitation sourcesexist,but these techniques are outside the scope of this testmethod.1.3 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.3.1 The method used to specify how data are collected,calculated,or recorded in this standard is not directly related tothe accuracy to which data can be applied in design or otheruses,or both.How one applies the results obtained using thisstandard is beyond its scope.1.4 The method used to specify how data are collected,calculated,or recorded in this test method is not directly relatedto the accuracy to which data can be applied in design or otheruses,or both.How one applies the results obtained using thisstandard is beyond its scope.1.5 This standard provides minimum requirements forcrosshole(or single hole)testing of concrete deep foundationelements.Plans,specifications,provisions,or combinationsthereof prepared by a qualified engineer,and approved by theagency requiring the test(s),may provide additional require-ments and procedures as needed to satisfy the objectives of aparticular test program.1.6 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.8 LimitationsProper installation of the access ducts isessential for effective testing and interpretation.The methoddoes not give the exact type of defect(for example,inclusion,honeycombing,lack of cement particles,etc.)but rather onlythat a defect exists.The method is limited primarily to testingthe concrete between the access ducts and thus gives littleinformation about the concrete outside the reinforcement cageto which the access ducts are attached when the tubes areattached to the inside of the reinforcement cage.1.9 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:2D1143 Test Method for Piles Under Static Axial Compres-sive Load(Withdrawn 2005)3D3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4945 Test Method for High-Strain Dynamic Testing ofDeep FoundationsD5882 Test Method for Low Strain Impact Integrity Testingof Deep FoundationsD6026 Practice for Using Significant Digits in GeotechnicalData1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.11 on Deep Foundations.Current edition approved June 1,2014.Published July 2014.Originally approvedin 2002.Last previous edition approved in 2008 as D6760 08.DOI:10.1520/D6760-14.2For 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.3The 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 States1 3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 access ducts,npreformed steel tubes,plastic tubes(for example,PVC or equivalent),or drilled boreholes,placedin the concrete to allow probe entry in pairs to measure pulsetransmission in the concrete between the probes.3.1.2 anomaly,nirregularity or series of irregularitiesobserved in an ultrason