Designation:D6760−16StandardTestMethodforIntegrityTestingofConcreteDeepFoundationsbyUltrasonicCrossholeTesting1ThisstandardisissuedunderthefixeddesignationD6760;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversproceduresforcheckingthehomogeneityandintegrityofconcreteindeepfoundationsuchasboredpiles,drilledshafts,concretepilesoraugercastpiles.Thismethodcanalsobeextendedtodiaphragmwalls,barrettes,damsetc.Inthistestmethod,alltheabovewillbedesignated“deepfoundationelements.”Thetestmeasuresthepropagationtimeandrelativeenergyofanultrasonicpulsebetweenparallelaccessducts(crosshole)orinasingletube(singlehole)installedinthedeepfoundationelement.Thismethodismostapplicablewhenperformedintubesthatareinstalledduringconstruction.1.2Similartechniqueswithdifferentexcitationsourcesexist,butthesetechniquesareoutsidethescopeofthistestmethod.1.3AllobservedandcalculatedvaluesshallconformtotheguidelinesforsignificantdigitsandroundingestablishedinPracticeD6026.1.4Themethodusedtospecifyhowdataarecollected,calculated,orrecordedinthistestmethodisnotdirectlyrelatedtotheaccuracytowhichdatacanbeappliedindesignorotheruses,orboth.Howoneappliestheresultsobtainedusingthisstandardisbeyonditsscope.1.5Thisstandardprovidesminimumrequirementsforcrosshole(orsinglehole)testingofconcretedeepfoundationelements.Plans,specifications,provisions,orcombinationsthereofpreparedbyaqualifiedengineer,andapprovedbytheagencyrequiringthetest(s),mayprovideadditionalrequire-mentsandproceduresasneededtosatisfytheobjectivesofaparticulartestprogram.1.6Thetextofthisstandardreferencesnotesandfootnoteswhichprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthestandard.1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.N...
