ASTM C744-2008 Standard Specification for Prefaced Concrete and Calcium Silicate Masonry Units.pdf
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1、Designation: C 744 08Standard Specification forPrefaced Concrete and Calcium Silicate Masonry Units1This standard is issued under the fixed designation C 744; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. 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 Department of Defense.1. Scope*1.1 This specification covers prefaced concrete maso
3、nryunits with the exposed-to-view-in-place surfaces covered at thepoint of manufacture with resin, resin and inert filler, or cementand inert filler to produce a smooth resinous tile facing. Thisspecification does not address, and therefore is not applicableto, ground-face concrete masonry units tha
4、t are manufacturedby grinding a thin layer off the surface of a concrete masonryunit to expose aggregates within and polishing to produce asmooth, architectural finish.1.2 The text of this specification references notes andfootnotes which provide explanatory material. These notes andfootnotes (exclu
5、ding 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 stand
6、ard.2. Referenced Documents2.1 ASTM Standards:2C55 Specification for Concrete Building BrickC73 Specification for Calcium Silicate Brick (Sand-LimeBrick)C90 Specification for Loadbearing Concrete MasonryUnitsC 129 Specification for Nonloadbearing Concrete MasonryUnitsC 140 Test Methods for Sampling
7、and Testing ConcreteMasonry Units and Related UnitsC 501 Test Method for Relative Resistance to Wear ofUnglazed Ceramic Tile by the Taber AbraserC 1209 Terminology of Concrete Masonry Units and Re-lated UnitsC 1232 Terminology of MasonryD 822 Practice for Filtered Open-Flame Carbon-Arc Expo-sures of
8、 Paint and Related CoatingsD 2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD 2486 Test Methods for Scrub Resistance of Wall PaintsE84 Test Method for Surface Burning Characteristics ofBuilding Materials3. Terminology3.1 Terminolog
9、y defined in Terminology C 1209 andC 1232 shall apply for this specification.4. Materials4.1 Concrete masonry units on which prefaced surfaces aremolded shall meet the requirements of:4.1.1 Specification C55for Concrete Building Brick.4.1.2 Specification C73 for Calcium Silicate Face Brick(Sand-Lime
10、 Brick).4.1.3 Specification C90for Loadbearing Concrete MasonryUnits.4.1.4 Specification C 129 for Nonloadbearing Units.NOTE 1The purchaser of prefaced units should indicate the applicablespecification and the type and grade of unit required. Where prefaced unitsare required for exterior use, the ma
11、nufacturer should be consulted formaterial suitable for this purpose.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
12、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 to theconcrete masonry unit at the time of failure of the entireprefaced unit when tested in compressio
13、n in accordance with7.4.1This specification is under the jurisdiction of ASTM Committee C15 onManufactured Masonry Units and is the direct responsibility of SubcommitteeC15.03 on Concrete Masonry Units and Related Units.Current edition approved Aug. 1, 2008. Published September 2008. Originallyappro
14、ved in 1973. Last previous edition approved in 2005 as C 744 05.2For 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 websi
15、te.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.4 AbrasionThe wear index shall exceed 130 whentested in accordance with 7.5.5.5 Surface Burning CharacteristicsWhe
16、n tested in ac-cordance with 7.6, the surfaces of the prefaced units shall havea flame spread classification not greater than 25 withoutevidence of continued progressive combustion and shall have asmoke density rating not greater than 50.5.6 Color, Tint, or TextureColor, tint, or texture shall be as
17、specified. When tested in accordance with 7.7 and thencompared with an unexposed unit, there shall be no change intexture, and color differences shall not exceed 5.0 Delta units.5.7 Soiling and CleansabilityThere shall not be a stainvisible when specimens are tested in accordance with 7.8.1 andthen
18、viewed from a distance of 10 ft (3m) under an illuminationof not less than 50 footcandles (538.2 lm/m2) by an observerwith normal vision. Spotting media shall be observed to becompletely removed from specimens when tested in accor-dance with 7.8.2 and 7.8.3 and then viewed from a distance of10 ft (3
19、 m) under an illumination of not less than 50footcandles (538.2 lm/m2) by an observer with normal vision.5.8 ReportTest reports shall show the results of testsrequired by 5.1 through 5.7.6. Dimensional Tolerances6.1 Face DimensionThe total variation from specifieddimensions in the finished face dime
20、nsions of the units shallnot exceed 6116 in. (1.6 mm) from specified dimensions.6.2 DistortionThe distortion of the plane and edges of theface of individual units from the corresponding plane surfaceand edges of the concrete masonry unit shall not exceed116 in.(1.6 mm).7. Sampling and Testing7.1 The
21、 purchaser or authorized representative shall beaccorded proper facilities to inspect and sample the prefacedconcrete masonry units at the place of manufacture from thelots ready for delivery.7.2 CrazingResistance to crazing of prefaced concretemasonry units shall be determined by oven drying from a
22、saturated condition in accordance with 13.2 of Test MethodsC 140, allowing the specimen to cool to room temperature, andresaturating.7.3 Resistance to ChemicalsApply a convenient quantityof the chemicals, as shown in Table 1, one at a time on thefacing material and leave covered with a watchglass fo
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