1、Designation:C74416Standard Specification forPrefaced Concrete and Calcium Silicate Masonry Units1This standard is issued under the fixed designation C744;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A num
2、ber 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 This specification covers prefaced concrete and calciums
3、ilicate masonry units with the finished face(s)covered at thepoint of manufacture with resin,resin and inert filler,or cementand inert filler to produce a smooth tile-like surface feature.This specification does not address,and therefore is notapplicable to,ground-face concrete masonry units that ar
4、emanufactured by grinding a thin layer off the surface of aconcrete masonry unit to expose aggregates within and polish-ing to produce a smooth,architectural finish.1.2 The text of this specification references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding
5、those in tables and figures)shall not beconsidered as requirements of the standard.1.3 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.2.R
6、eferenced Documents2.1 ASTM Standards:2C55 Specification for Concrete Building BrickC73 Specification for Calcium Silicate Brick(Sand-LimeBrick)C90 Specification for Loadbearing Concrete Masonry UnitsC129 Specification for Nonloadbearing Concrete MasonryUnitsC140 Test Methods for Sampling and Testin
7、g ConcreteMasonry Units and Related UnitsC501 Test Method for Relative Resistance to Wear ofUnglazed Ceramic Tile by the Taber AbraserC1232 Terminology of MasonryD822 Practice for Filtered Open-Flame Carbon-Arc Expo-sures of Paint and Related CoatingsD2244 Practice for Calculation of Color Tolerance
8、s andColor Differences from Instrumentally Measured ColorCoordinatesD2486 Test Methods for Scrub Resistance of Wall PaintsE84 Test Method for Surface Burning Characteristics ofBuilding Materials3.Terminology3.1 Terminology defined in Terminology C1232 shall applyfor this specification.3.2 Definition
9、s of Terms Specific to This Standard:3.2.1 prefaced concrete masonry unit,na concrete ma-sonry unit where the finished face(s)are covered at the point ofmanufacture with either resin,resin and an inert filler,orcement and an inert filler to produce a smooth,tile-like surfacefeature.3.2.1.1 Discussio
10、nSome prefaced units may also be re-ferred to as glazed concrete masonry units.3.2.2 prefaced calcium silicate masonry unit,na calciumsilicate masonry unit where the finished face(s)are covered atthe point of manufacture with either resin,resin and an inertfiller,or cement and an inert filler to pro
11、duce a smooth,tile-likesurface feature.3.2.2.1 DiscussionSome prefaced units may also be re-ferred to as glazed calcium silicate masonry units.4.Materials4.1 Concrete masonry units on which prefaced surfaces aremolded shall meet the requirements of:4.1.1 Specification C55 for Concrete Building Brick
12、.4.1.2 Specification C90 for Loadbearing Concrete MasonryUnits.4.1.3 Specification C129 for Nonloadbearing Units.4.2 Calcium silicate units on which prefaced surfaces aremolded shall meet the requirements of Specification C73 forCalcium Silicate Brick(Sand-Lime Brick).NOTE1The purchaser of prefaced
13、units should indicate the applicablespecification and the type and grade of unit required.Where prefaced unitsare required for exterior use,the manufacturer should be consulted formaterial suitable for this purpose.1This specification is under the jurisdiction of ASTM Committee C15 onManufactured Ma
14、sonry Units and is the direct responsibility of SubcommitteeC15.03 on Concrete Masonry Units and Related Units.Current edition approved Feb.1,2016.Published February 2016.Originallyapproved in 1973.Last previous edition approved in 2014 as C744 14.DOI:10.1520/C0744-16.2For referenced ASTM standards,
15、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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100
16、 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Facing Requirements5.1 Resistance to Crazing,Cracking,or SpallingThereshall be no crazing,cracking,or spalling of the facing materialwhen the unit is tested in accordance with 7.2.5.2 Resistance to ChemicalsThe condition of the surfaceshall show no change after testing with each of the chemicalslisted in 7.3.5.3 AdhesionWhen viewed without magnification,thereshall be no failure of the adhesion of the facing material
