1、Designation: C744 11Standard 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.
2、 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 and ca
3、lciumsilicate masonry units with the exposed-to-view-in-place sur-faces covered at the point of manufacture with resin, resin andinert filler, or cement and inert filler to produce a smoothresinous tile facing. This specification does not address, andtherefore is not applicable to, ground-face concr
4、ete masonryunits that are manufactured by grinding a thin layer off thesurface of a concrete masonry unit to expose aggregates withinand polishing to produce a smooth, architectural finish.1.2 The text of this specification references notes andfootnotes which provide explanatory material. These note
5、s andfootnotes (excluding 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
6、 not considered standard.2. Referenced 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 M
7、ethods for Sampling and Testing 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
8、Calculation of Color Tolerances 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 th
9、is specification.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.4.1.2 Specification C90 for Loadbearing Concrete MasonryUnits.4.1.3 Specification C129 for Nonloadbearing Units.4.2 Calcium
10、silicate units on which prefaced surfaces aremolded shall meet the requirements of Specification C73 forCalcium Silicate Brick (Sand-Lime Brick).NOTE 1The purchaser of prefaced units should indicate the applicablespecification and the type and grade of unit required. Where prefaced unitsare required
11、 for exterior use, the manufacturer 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 7.2.1This specification
12、 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 Feb. 1, 2011. Published February 2011. Originallyapproved in 1973. Last previous edition approved
13、in 2010 as C744 10. DOI:10.1520/C0744-11.2For 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 website.1*A Summary of Chang
14、es 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.5.2 Resistance to ChemicalsThe condition of the surfaceshall show no change after testing with each of the chemicalslisted in 7.3.5.3 Adhes
15、ionWhen viewed without magnification, thereshall be no failure of the adhesion of the facing material to theunit subsequent to failure of the entire prefaced unit whentested in compression in accordance with 7.4.5.4 AbrasionThe wear index shall exceed 130 whentested in accordance with 7.5.5.5 Surfac
16、e Burning CharacteristicsWhen 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,
17、tint, or texture shall be asspecified. 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 ac
18、cordance with 7.8.1 andthen viewed from a distance of 10 ft (3m) under an illuminationof not less than 50 fc (538.2 lm/m2) by an observer with normalvision. Spotting media shall be observed to be completelyremoved from specimens when tested in accordance with 7.8.2and 7.8.3 and then viewed from a di
19、stance of 10 ft (3 m) underan illumination of not less than 50 fc (538.2 lm/m2)byanobserver 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 fac
20、e dimensions 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 unit shall not exceed116 in. (1.6 mm).7. Sampling and Testing7.1 The purchaser
21、 or authorized representative shall beaccorded proper facilities to inspect and sample the prefacedunits at the place of manufacture from the lots ready fordelivery.7.2 CrazingResistance to crazing of prefaced units shallbe determined by oven drying from a saturated condition inaccordance with the a
22、bsorption testing procedure of TestMethods C140, allowing the specimen to cool to room tem-perature, and resaturating.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 for theduration o
23、f 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 time pre-scrib
24、ed in Table 1.7.4 Adhesion of FacingTest three prefaced units forcompressive strength in accordance with Test Methods C140.Apply the compressive load until failure of the entire unitoccurs. Subsequent to failure of the entire unit, view withoutmagnification the interface between the unit and the fac
25、ingmaterial and note any adhesion failures.7.5 AbrasionDetermine the wear index in accordancewith Test Method C501 using Taber Abraser Research Model503 with a Taber CS-17 abrasive wheel and a 1000-g weightfor 500 wear cycles.7.6 Surface BurningDetermine flame spread and smokeratings in accordance w
26、ith 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 D2244. Take measurements before and after 500 h ofaccelerated weathering using the single-arc apparatus in a
27、ccor-dance with Practice D822. 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 consisting of 0.5 g ofoil-soluble dye (C.I. Solvent Orange 7, C.I. 12140), 1.0 g oflanolin, and
28、 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 inaccordance with Test Method D2486 using an industrial-gradecleaning agent. Examine
29、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 following stainson each specimen:7.8.2.1 Writing Pencil, No. 2Apply the pencil soil bywe
30、dging 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 Magic MarkerApply the Magic-Marker soil bywedging it in a glass tube that fits snugly but
31、 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 using anartists or similar brush.TABLE 1 Resistance to ChemicalsChemicalDuration ofTest,
32、 hAcetic acid (CH3COOH) (5 %) 24Hydrochloric 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 %) 3C744 1127.8.2.4 Carbon PaperApp
33、ly 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.7.8.3 Clean the stained areas as specified in 7.8.1 except asfollows:7.8.3.1 Use 100 % isopropyl alcohol to clean the Magic-Marker medium; clean spotting
34、 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 units shall be sound and free of cracks orother defects that interfere with the proper placing of the unitsor im
35、pair the strength or permanence of the construction.8.2 SurfaceThe coated surface shall be free of chips,crazes, cracks, blisters, crawling, holes, and other imperfec-tions detracting from the appearance of the units when viewedfrom a distance of 5 ft (1.5 m) perpendicular to the coatedsurface and u
36、sing 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 shall be selected by thepurchaser from remaining units from the shipment with asimilar configuration
37、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 requirements. If thesecond sample fails to meet the specified requirements, theremaining portion of t
38、he 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 results of the tests show thatthe units do not conform to the requirements of this specification, the costi
39、s 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 silicate masonry units; concrete masonryunits; masonry units; prefaced unitsSUMMARY OF CHANGESCommittee
40、C15 has identified the location of selected changes to this standard since the last issue (C744 10)that may impact the use of this standard. (Approved Feb. 1, 2011.)(1) Sections 5.3 and 7.4 were revised to clarify requirementsand testing methods.Committee C15 has identified the location of selected
41、changes to this standard since the last issue (C744 09)that may impact the use of this standard. (Approved June 1, 2010.)(1) Multiple sections were revised to remove specific refer-ences to concrete masonry units.ASTM International takes no position respecting the validity of any patent rights asser
42、ted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any 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
43、the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receiv
44、e careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received 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 Intern
45、ational, 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C744 113
