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
23、r theduration of the test period. For volatile chemicals, place asaturated wad under the watchglass and keep saturated. Uponcompletion of the test period, wipe the test area clean with aclean cloth. The condition of the test area shall show no changeafter testing with each chemical for the specified
24、 time pre-scribed in Table 1.7.4 Adhesion of FacingTest three prefaced concrete ma-sonry units for compressive strength in accordance with TestMethods C 140.Apply the compressive load until failure of theentire unit occurs. When viewed without magnification, thereshall be no visible failure of the a
25、dhesion of the facing materialto the concrete masonry unit at the time of failure of the entireprefaced concrete masonry unit.7.5 AbrasionDetermine the wear index in accordancewith Test Method C 501 using Taber Abraser Research Model503 with a Taber CS-17 abrasive wheel and a 1000-g weightfor 500 we
26、ar cycles.7.6 Surface BurningDetermine flame spread and smokeratings in accordance with Test Method E84.7.7 Color ChangeDetermine color difference using CIEL*, a*, b*, or CIELAB (1976) with two-degree observer,illuminant C, and specular excluded in accordance with TestMethod D 2244. Take measurement
27、s before and after 500 h ofaccelerated weathering using the single-arc apparatus in accor-dance with Practice D 822. Use test panels not less than 3 in.(76.2 mm) wide by 6 in. (152.4 mm) long. Test panels need notbe conditioned.7.8 Soiling and Cleansability:7.8.1 Staining MediaPour a stain consistin
28、g of 0.5 g ofoil-soluble dye (C.I. Solvent Orange 7, C.I. 12140), 1.0 g oflanolin, and 5.0 g of SAE 10 oil one at a time on an areaapproximately12 in. (12.7 mm) in diameter on the preface sideof units. Allow the stain to remain on the specimens for aperiod of 4 days. Clean the specimen for 80 cycles
29、 inaccordance with Test Method D 2486 using an industrial-gradecleaning agent. Examine the cleaned surface for the followingdegrees of intensity (see 5.7):7.8.1.1 Stain completely removed.7.8.1.2 Trace.7.8.1.3 Evident.7.8.1.4 Pronounced.7.8.1.5 Very pronounced.7.8.2 Spotting MediaApply each of the f
30、ollowing stainson each specimen:7.8.2.1 Writing Pencil, No. 2Apply the pencil soil bywedging it in a glass tube that fits snugly but floats freely in awooden block. Apply the soil by placing a 500-g weight on topof the pencil in such a manner that the soil is uniform in widthand thickness.7.8.2.2 Ma
31、gic MarkerApply the Magic-Marker soil bywedging it in a glass tube that fits snugly but floats freely in awooden block. Apply the soil by placing a 500-g weight on topof the Magic Marker in such a manner that the soil is uniformin width and thickness.7.8.2.3 LanolinSmear the lanolin on the surface u
32、sing anartists or similar brush.7.8.2.4 Carbon PaperApply the carbon paper soil byplacing a 500-g weight on 1 in.2(645.2 mm2) of paper anddrawing the weighted paper across the surface in a singlestroke.TABLE 1 Resistance to ChemicalsChemicalDuration ofTest, hAcetic acid (CH3COOH) (5 %) 24Hydrochlori
33、c acid (HCl) (10 %) 3Potassium hydroxide (KOH) (10 %) 3Trisodium phosphate (Na3PO4)(5%) 24Hydrogen peroxide (H2O2)(3%) 24Household detergent (10 %) 24Vegetable oil 24Blue-black ink 1Ethyl alcohol, industrial denatured (95 %) 3C7440827.8.3 Clean the stained areas as specified in 7.8.1 except asfollow
34、s:7.8.3.1 Use 100% isopropyl alcohol to clean the Magic-Marker medium; clean spotting of writing pencil medium for10 cycles; clean spotting of Magic-Marker medium for 150cycles; clean spotting of lanolin and of carbon paper media for60 cycles.8. Inspection8.1 All prefaced concrete masonry units shal
35、l be sound andfree of cracks or other defects that interfere with the properplacing of the units or impair the strength or permanence of theconstruction.8.2 SurfaceThe coated surface shall be free of chips,crazes, cracks, blisters, crawling, holes, and other imperfec-tions detracting from the appear
36、ance of the units when viewedfrom a distance of 5 ft (1.5 m) perpendicular to the coatedsurface and using daylight without direct sunlight.9. Compliance9.1 If a sample fails to conform to the specified require-ments, the manufacturer shall be permitted to remove unitsfrom the shipment. A new sample
37、shall be selected by thepurchaser from remaining units from the shipment with asimilar configuration and dimension and tested at the expenseof the manufacturer. If the second sample meets the specifiedrequirements, the remaining portion of the shipment repre-sented by the sample meets the specified
38、requirements. If thesecond sample fails to meet the specified requirements, theremaining portion of the shipment represented by the samplefails to meet the specified requirements.NOTE 2Unless otherwise specified in the purchase order, the cost oftests is typically borne as follows: (1) if the result
39、s of the tests show thatthe units do not conform to the requirements of this specification, the costis typically borne by the seller; (2) if the results of the tests show that theunits conform to the specification requirements, the cost is typically borneby the purchaser.10. Keywords10.1 calcium sil
40、icate masonry units; concrete masonryunits; masonry units; prefaced unitsSUMMARY OF CHANGESCommittee C15 has identified the location of selected changes to this standard since the last issue (C 744 05)that may impact the use of this standard. (Approved Aug. 1, 2008.)(1) Subsection 1.1 was modified t
41、o preclude application ofC 744 to ground-face concrete masonry units.ASTM 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 expressly advised that determination of the validity of an
42、y such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are i
43、nvited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not receiv
44、ed a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C744083
