1、Designation:D676016Standard 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 ye
2、ar 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 bo
3、red 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 para
4、llel 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
5、 this testmethod.1.3 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.4 The method used to specify how data are collected,calculated,or recorded in this test method is not directly relatedto the accuracy to which dat
6、a 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 p
7、repared 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 not
8、es 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
9、for effective testing and interpretation.The methoddoes not give the exact type of flaw(for example,inclusion,honeycombing,lack of cement particles,etc.)but rather onlythat a flaw exists.1.9 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is ther
10、esponsibility 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:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD1143 Test Method for Piles Und
11、er 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 Strai
12、n Impact Integrity Testingof Deep FoundationsD6026 Practice for Using Significant Digits in GeotechnicalData3.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 concret
13、e to allow probe entry in pairs to measure pulsetransmission in the concrete between the probes.1This 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 Dec.1,2016.Published J
14、anuary 2017.Originallyapproved in 2002.Last previous edition approved in 2014 as D6760 14.DOI:10.1520/D6760-16.2For 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 standa
15、rds 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 StatesThis international standard was developed in accordance with in
16、ternationally 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 3.1.2 anomaly,nirregularity or series of irregularitiesobserved in an ultrasonic profile indicating a possible flaw.3.1.3 defect,na flaw that,because of either size orlocation,may significantly detract from the elements capacityor durability.3.1.4