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Designation: C1072 − 26Standard Test Methods forMeasurement of Masonry Flexural Bond Strength 1This standard is issued under the f i xed designation C1072; 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 These test methods evaluate the f l exural bond strength,normal to the bed joints, of masonry built of manufacturedmasonry units. Sampling and testing procedures are referenced,and terms are def i ned. Three different specimen fabricationmethods are specif i ed, each for a different purpose:1.1.1 The f i rst method is the “Test Method for Laboratory-Prepared Specimens.” Its purpose is to compare the bondstrengths (under the given conditions) of masonry mortars. Itcould be used, for example, to check the quality of mortarproducts after production, or to indicate the bond strength(under the given conditions) of a mortar product withoutrequiring the product to be tested in combination with manydifferent units. It is not intended to represent f i eld conditions.It uses standard concrete masonry units. Mortars are batchedby weight equivalents of volume proportions and are mixed toa prescribed f l ow. Prisms are constructed using a jig and arebag-cured.1.1.2 The second method is the “Test Method for Field-Prepared Specimens.” Its purpose is to evaluate the bondstrength (under the given conditions) of a particular unit-mortarcombination, either for preconstruction evaluation of materialsor for quality control purposes during construction. Mortars arebatched conventionally, and the f l ow is not prescribed. Prismsare constructed conventionally (no jig) and are bag-cured.1.1.3 The third method is the “Test Method for PrismsRemoved from Existing Masonry.” Its purpose is to evaluatethe bond strength of unit-mortar combinations of prisms cutfrom existing walls.1.1.4 The three methods are not consistent, nor are theyintended to be. They are intended to be used for three differentpurposes. To make this clear, the three methods are presentedseparately.1.1.5 Appendix X1 suggests two possible criteria for assess-ing the bond strength values obtained using these test methods.These possible evaluation criteria are given for illustration onlyand are not mandatory.1.2 The text of this standard refers to notes and footnotesthat provide explanatory material. These notes and footnotes(excluding those in tables and f i gures) shall not be consideredas requirements of the standard.1.3 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are mathemati-cal conversions to SI units that are provided for informationonly and are not considered standard.1.4 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, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2C67/C67M Test Methods for Sampling and Testing Brickand Structural Clay TileC140/C140M Test Methods for Sampling and Testing Con-crete Masonry Units and Related UnitsC230/C230M Specif i cation for Flow Table for Use in Testsof Hydraulic CementC270 Specif i cation for Mortar for Unit MasonryC780 Test Methods for Preconstruction and ConstructionEvaluation of Mortars for Plain and Reinforced UnitMasonryC1232 Terminology for MasonryC1437 Test Method for Flow of Hydraulic Cement Mortar1 These test methods are under the jurisdiction of ASTM Committee C15 onMasonry - Manufactured Masonry Units, Mortars and Grouts and are the directresponsibility of Subcommittee C15.04 on Research for Masonry Units andAssemblies.Current edition approved June 1, 2026. Published July 2026. Originally approvedin 1993. Last previous edition approved in 2022 as C1072 – 22. DOI: 10.1520/C1072-26.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.*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 StatesThis international standard was developed in accordance with internationally 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