1、Designation:C90015Standard Test Method forPullout Strength of Hardened Concrete1This standard is issued under the fixed designation C900;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 parenthese
2、s 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 determination of the pulloutstrength of hardened concrete by measuring the force requiredto pull an embedded metal insert and the atta
3、ched concretefragment from a concrete test specimen or structure.The insertis either cast into fresh concrete or installed in hardenedconcrete.This test method does not provide statistical proce-dures to estimate other strength properties.1.2 The values stated in SI units are to be regarded as thest
4、andard.No other units of measurement are included in thistest method.1.3 The text of this test method references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of this test method.1.4 This st
5、andard 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.(WarningFreshhydraulic cement
6、itious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)2.Referenced Documents2.1 ASTM Standards:3C125 Terminology Relating to Concrete and Concrete Ag-gregatesC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction Mate
7、rialsE4 Practices for Force Verification of Testing MachinesE74 Practice of Calibration of Force-Measuring Instrumentsfor Verifying the Force Indication of Testing Machines3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this practice,refer toTerminology C125.4.Summary of Test Met
8、hod4.1 A metal insert is either cast into fresh concrete orinstalled into hardened concrete.When a measure of thein-place pullout strength is desired,the insert is pulled bymeans of a jack reacting against a bearing ring.The pulloutstrength is determined by measuring the maximum forcerequired to pul
9、l the insert from the concrete mass.Alternatively,the insert is loaded to a specified load to verifywhether a minimum level of in-place pullout strength has beenattained.5.Significance and Use5.1 For a given concrete and a given test apparatus,pulloutstrengths can be related to compressive strength
10、test results.Such strength relationships are affected by the configuration ofthe embedded insert,bearing ring dimensions,depth ofembedment,and the type of aggregate(lightweight or normalweight).Before use,the relationships must be established foreach test system and each new concrete mixture.Such re
11、la-tionships are more reliable if both pullout test specimens andcompressive strength test specimens are of similar size,con-solidated to similar density,and cured under similar conditions.NOTE1Published reports(1-17)4by different researchers present theirexperiences in the use of pullout test equip
12、ment.Refer toACI 228.1R(14)for guidance on establishing a strength relationship and interpreting testresults.The Appendix provides a means for comparing pullout strengthsobtained using different configurations.5.2 If a strength relationship has been established experi-mentally and accepted by the sp
13、ecifier of tests,pullout tests areused to estimate the in-place strength of concrete to establishwhether it has reached a specified level so that,for example:(1)post-tensioning may proceed;(2)forms and shores may be removed;(3)structure may be placed into service;or(4)winter protection and curing ma
14、y be terminated.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.64 on Nondestructive and In-Place Testing.Current edition approved May 1,2015.Published June 2015.Originallyapproved in 1978.Last p
15、revious edition approved in 2014 as C900 14.DOI:10.1520/C0900-15.2Section on Safety Precautions,Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards,Vol 04.02.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For A
16、nnual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4The boldface numbers refer to the list of references at the end of this testmethod.*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 In addition,post-installed pullout tests may be used toestimate the strength of concrete in existing construction.5.3 When plannin
