ASTM_C_780_-_18a.pdf

Designation:C78018aStandard Test Method forPreconstruction and Construction Evaluation of Mortars forPlain and Reinforced Unit Masonry1This standard is issued under the fixed designation C780;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.INTRODUCTIONThis test method provides a standard procedure for sampling and testing mortars for compositionand plastic and hardened properties,either before or during actual construction.The proceduresoutlined in the Annexes are considered applicable for evaluating various combinations of portlandcement,lime,and masonry cement for mortars common to plain and reinforced unit masonryconstruction.The test procedures describe methods for the measurement of mortar composition and mortarproperties.No attempt is made to claim or substantiate specific correlations between the measuredproperties and mortar performance in the masonry.However,data from these test methods can becombined with other information to formulate judgments about the quality of the masonry.Testing using these procedures is limited to the preconstruction evaluation of masonry mortarswithin the laboratory,to the evaluation of masonry mortars at the construction site,and in establishingthe degree of quality control exercised during mortar production at the construction site.1.Scope*1.1 This test method covers procedures for the sampling andtesting of mortars for composition and for their plastic andhardened properties,either before or during their actual use inconstruction.NOTE1Guide C1586 provides guidance on evaluating mortar andclarifies the purpose of both this test method and Specification C270.NOTE2The testing agency performing this test method should beevaluated in accordance with Practice C1093.1.2 Preconstruction EvaluationThis test method permitscomparisons of mortars made from different materials undersimulated field conditions.It is also used to establish baselinevalues for comparative evaluation of field mortars.1.3 Construction EvaluationUse of this method in thefield provides a means for quality assurance of field-mixedmortar.It includes methods for verifying the mortar mixproportions,comparing test results for field mortars to precon-struction testing,and determining batch-to-batch uniformity ofthe mortar.1.4 The test results obtained under this test method are notrequired to meet the minimum compressive values in accor-dance with the property specifications in Specification C270.1.5 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.1.6 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.For specific hazards statements,see Section 8.1.7 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.1This test method is under the jurisdiction ofASTM Committee C12 on Mortarsand Grouts for Unit Masonry and is the direct responsibility of SubcommitteeC12.02 on Research and Methods of Test.Current edition approved Aug.15,2018.Published September 2018.Originallyapproved in 1974.Last previous edition approved in 2018 as C780 18.DOI:10.1520/C0780-18A.*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 2.Referenced Documents2.1 ASTM Standards:2C39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C128 Test Method for Relative Density(Specific Gravity)and Absorption of Fine AggregateC173/C173M Test Method forAir Content of Freshly MixedConcrete by the Volumetric MethodC185 Test Method for Air Content of Hydraulic CementMortarC187 Test Method for Amount of Water Required for Nor-mal