ASTM_C_1531_-_16.pdf

Designation:C153116Standard Test Methods forIn Situ Measurement of Masonry Mortar Joint ShearStrength Index1This standard is issued under the fixed designation C1531;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 These test methods cover procedures for the determina-tion of the average in situ mortar joint shear strength index inexisting unreinforced solid-unit and ungrouted hollow-unitmasonry built with clay or concrete units.Three methods areprovided:1.1.1 Method A(with Flatjacks Controlling Normal Com-pressive Stress)For determining mortar joint shear strengthindex when the state of normal compressive stress at the testsite is controlled during the test using the flatjack methoddescribed in Test Method C1197.Horizontal displacement ofthe test unit is monitored throughout the test.The test setup forMethod A is shown in Fig.1.1.1.2 Method B(without Flatjacks Controlling NormalCompressive Stress)For determining mortar joint shearstrength index when using an estimate of the normal compres-sive stress at the location of the test site.Horizontal displace-ment of the test unit is not monitored during this procedure.The test set up for Method B is shown in Fig.2.1.1.3 Method C(with Flatjack Applying Horizontal Load)For determining mortar joint shear strength index using anestimate of the normal compressive stress at the location of thetest site,as shown in Fig.3.Horizontal displacement of the testunit is generally not measured during this procedure.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 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:2C1180 Terminology of Mortar and Grout for Unit MasonryC1196 Test Method for In Situ Compressive Stress WithinSolid Unit Masonry Estimated Using Flatjack Measure-mentsC1197 Test Method for In Situ Measurement of MasonryDeformability Properties Using the Flatjack MethodC1232 Terminology of MasonryE4 Practices for Force Verification of Testing Machines2.2 Other Document:International Existing Building Code(Appendix A,ChapterA1,Seismic Strengthening Provisions for UnreinforcedMasonry Bearing Wall Buildings),20143ASCE/SEI 41 Seismic Evaluation and Retrofit of ExistingBuildings,ASCE Standard ASCE/SEI 41(Chapter 11,Masonry)43.Terminology3.1 Terminology defined in Terminologies C1180 andC1232 shall apply for these test methods.4.Summary of Test Method4.1 The in-place shear test is used to provide an index of thein situ,horizontal shear resistance of mortar joints in unrein-forced masonry.For Method A,a single masonry unit isremoved from opposite ends of the chosen test unit as shownin Fig.1.For Method B,a single masonry unit and a head jointare removed from opposite ends of the chosen test unit,asshown in Fig.2.For Method C,head joints on both ends of thetested unit are removed as shown in Fig.3.Ensure that the bedjoints are not disturbed in the unit to be tested.The test unit isthen displaced horizontally relative to the surrounding masonryusing a hydraulic jack or specialized flatjacks.The horizontal1These test methods are under the jurisdiction of ASTM Committee C15 onManufactured Masonry Units and are the direct responsibility of SubcommitteeC15.04 on Research.Current edition approved June 1,2016.Published July 2016.Originally approvedin 2002.Last previous edition approved in 2015 as C1531 15.DOI:10.1520/C1531-16.2For 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 standards Document Summary page onthe ASTM website.3Available from International Code Council,4051 Flossmoor Road,CountryClub Hills,IL 60478.4Available from American Society of Civil Engineers(ASCE),1801 AlexanderBell Dr.,Reston,VA 20191,http:/www.asce.org.*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 force required to cause first movement of the test unit providesa measured index of the mortar joint shear strength.5.Significance and Use5.1 This test method provides a means of evaluating thehorizontal in-plane shear behavior of mortar joints in existingunreinforced masonry assemblies(see Note 1).NOTE1The masonry mortar joint shear strength index obtained bythis test method can