1、Designation: C1586 17Standard Guide forQuality Assurance of Mortars1This standard is issued under the fixed designation C1586; 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 indic
2、ates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This document provides guidance regarding the properuse of Specification C270 and Test Method C780 for evaluat-ing masonry mortar produced in the laboratory and a
3、t theconstruction site.1.2 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 Organizati
4、on TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C144 Specification for Aggregate for Masonry MortarC270 Specification for Mortar for Unit MasonryC780 Test Method for Preconstruction and ConstructionEvaluation of Mortars for Plain and Reinforced UnitMasonry3.
5、Significance and Use3.1 This document is intended to provide guidance andclarification to designers, specifiers, inspectors, testingagencies, producers, and users in specifying and evaluatingmasonry mortar.3.2 Users of documents Specification C270 and TestMethod C780 often confuse and sometimes inad
6、vertentlymisuse parts of the two documents when specifying or evalu-ating masonry mortar. This guide seeks to address specificitems within Specification C270 and Test Method C780 to helppromote their proper use and interpretation.4. Specifying Masonry Mortar4.1 Use Specification C270 to specify maso
7、nry mortar byeither the Proportion or Property Specifications of thatstandard, but not both. If neither Proportion or PropertySpecification C270 are specified, the Proportion specificationshall govern, unless data are presented to and accepted by thespecifier to show that the mortar meets the proper
8、ty specifica-tion requirements.4.2 Proportion SpecificationsThese Specifications directthe mason to produce the masonry mortar using designatedvolumetric proportions of cementitious materials and aggregateas set forth in Table 1, Proportion Specifications, of Specifica-tion C270 for the Type of mort
9、ar specified. This procedure ofspecifying mortar requires no sampling and testing of mortar,and hence, no measurement of mortar properties in the labo-ratory or the field is required. All that is necessary is fieldconfirmation of the proper proportions of the mixes used inconstruction.4.3 Property S
10、pecificationsThese Specifications requiretesting of laboratory-prepared mortar for compliance with therequirements of Table 2, Property Specifications, of Specifica-tion C270 for the Type of mortar specified.4.3.1 The Property Specifications require evaluation of amortar with a consistency (flow) of
11、 110 6 5 %. This is anarbitrarily established mortar consistency that is used toapproximate the water content of mortar after it is placed in amasonry assemblage with absorbent masonry units. Theamount of water required in mortar produced at the construc-tion site is normally greater than the amount
12、 used for Specifi-cation C270 Property Specifications testing.4.3.2 Do not use the Specification C270 Property Specifi-cations requirements to evaluate construction site-producedmortars. Due to the higher amount of water necessary foractual masonry construction, mortar produced and sampled inthe fie
13、ld will typically have lower compressive strength thanthat produced in the laboratory per Specification C270.1This guide is under the jurisdiction of ASTM Committee C12 on Mortars andGrouts for Unit Masonryand is the direct responsibility of Subcommittee C12.03 onSpecifications for Mortars.Current e
14、dition approved Dec. 15, 2017. Published January 2018. Originallyapproved in 2004. Last previous edition approved in 2011 as C1586 05(2011).DOI: 10.1520/C1586-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book
15、of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognize
16、d 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.14.3.3 When mortar is specified by the PropertySpecifications, the qu
17、antities of cementitious materials andaggregates as determined through laboratory testing are con-verted to volumetric proportions to produce masonry mortar atthe construction site.5. Quality Assurance of Masonry Mortar5.1 Mortar MaterialsVerify that individual mortar mate-rials being used meet the
18、ASTM Standards listed under theMaterials Section of Specification C270. Compliance is typi-cally verified by submission of a letter of certification or testreport for each mortar material.NOTE 1If any of the materials used do not comply with the materialrequirements of Specification C270, the Propor
19、tion Specifications can notbe used. Specification C270 specifically permits the use of masonry sandsthat do not comply with the gradation requirements of Specification C144provided that the Property Specifications of Specification C270 are usedrather than the Proportion Specifications.5.2 Property S
20、pecificationsVerify that the tested proper-ties of the laboratory-prepared mortar meet the appropriateProperty Specifications requirements of Specification C270for the specified mortar Type. Also verify that the laboratorytest report includes the volumetric proportions and materialsused to meet the
21、Property Specifications.5.3 Proportioning of MaterialsUse inspection, testing, orboth to assure proper proportioning of mortar materials at theconstruction site.5.4 InspectionVerify by observation that the method ofmeasuring material quantities for the mortar used in construc-tion accurately maintai
22、ns the required proportions. Verify thatthe individual mortar materials being used are those approvedfor the project.5.5 Testing:5.5.1 Use Test Method C780, not Specification C270,toevaluate mortars prepared at the construction site.5.5.2 Use Test Method C780 to evaluate masonry mortarprepared at th
23、e construction site for the following properties:consistency (Test Method C780, Annex A1), board life (TestMethod C780, Annex A3), mortar aggregate ratio (TestMethod, Annex A4), and air content (Test Method C780,Annex A5). By measuring the mortar aggregate ratio, theproportion of cementitious materi
24、als to aggregate by mass canbe determined and then converted to proportions by volume.The measured volumetric proportions of the constructionsite-produced mortar can be compared to the SpecificationC270 Proportion Specifications or the volumetric proportionsderived for the Property Specifications, w
25、hichever applies.5.5.3 Measurement of construction site masonry mortarcompressive strength using Test Method C780, Annex A6, isnot the appropriate test method to determine the compliance ofthe mortar with the compressive strength requirements ofSpecification C270; however it may have some value in t
26、hedetermination of mortar uniformity. Construction site masonrymortar strengths are not generally equal to the values cited inthe Property Specifications Requirements Table of Specifica-tion C270 due to the difference between water contents of field-and laboratory-produced mortars. Furthermore, mort
27、ar com-pressive strengths can vary from day to day depending on theamount of mix water required, the curing conditions at theconstruction site, the weather conditions, masonry unit andsand moisture contents, and other variables.5.5.3.1 Measuring mortar compressive strength of field-sampled mortar ha
28、s no relevance unless preconstruction testingis performed in the laboratory using similar mixing equipment,mortar materials, and the same specimen geometry. Even whenthis is done, the field compressive strength data can only becompared to the preconstruction mortar strength data ingeneral, due to ot
29、her factors, such as weather, temperature ofmortar, and the absorption properties of the specific masonryunits being used.6. Preconstruction and Construction Evaluation ofMortar Properties6.1 Use Test Method C780 to evaluate mortar properties ofa mortar mixed to a field consistency.6.2 Annex A1 and
30、A3 of Test Method C780 are used tomeasure consistency (sometimes called plasticity or flow).Annex A6 is used to measure air content. Annex A7 is used tomeasure compressive strength.NOTE 2The consistency of mortar at a construction site should beadjusted to provide optimum workability that is compati
31、ble with themasonry units used in the construction, rather than using a predeterminedvalue for consistency. Due to different weather conditions (temperature,humidity, and wind velocity) and masonry unit and sand moisturecontents, mortar properties measured from construction site-producedspecimens ca
32、n be quite different from and more variable than thosemeasured during preconstruction evaluation testing.6.3 Properties of mortars measured by Test Method C780are not required nor expected to meet the Property Require-ments of Table 2 in Specification C270.7. Keywords7.1 aggregate ratio; compressive
33、 strength; consistency; fieldtesting; laboratory testing; masonry; mortar; quality; specify-ing; water contentC1586 172ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressl
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