1、Designation: C 744 05Standard 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 (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.Note Sections 5.7 and 7.1 were corrected and the year date c
3、hanged on April 14, 2005.1. Scope*1.1 This specification covers prefaced concrete masonryunits 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.1.2 The text of this sta
4、ndard references notes and footnoteswhich provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be consideredas requirements of the standard.2. Referenced Documents2.1 ASTM Standards:2C55 Specification for Concrete Building BrickC73 Specification fo
5、r Calcium Silicate Face Brick (Sand-Lime Brick)C90 Specification for Loadbearing Concrete MasonryUnitsC 129 Specification for Nonloadbearing Concrete MasonryUnitsC 140 Test Methods for Sampling and Testing ConcreteMasonry Units and Related UnitsC 501 Test Method for Relative Resistance to Wear ofUng
6、lazed Ceramic Tile by the Taber AbraserC 1209 Terminology of Concrete Masonry Units and Re-lated UnitsC 1232 Terminology of MasonryD 822 Practice for Conducting Tests on Paint and RelatedCoatings and Materials Using Filtered Open-FlameCarbon-Arc Light and Water Exposure ApparatusD 2244 Test Method f
7、or Calculation of Color Differencesfrom Instrumentally Measured Color CoordinatesD 2486 Test Method for Scrub Resistance of Interior LatexFlat Wall PaintsE84 Test Method for Surface Burning Characteristics ofBuilding Materials3. Terminology3.1 Terminology defined in Terminology C 1209 andC 1232 shal
8、l 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 Brick).4.1.3 Specification C90for Loadbearing
9、 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 manufacturer should be consulted formaterial sui
10、table for this purpose.5. Facing Requirements 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 c
11、hange 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 compression in accordance with7.4.5.
12、4 AbrasionThe wear index shall exceed 130 whentested in accordance with 7.5.5.5 Surface Burning CharacteristicsWhen tested in ac-cordance with 7.6, the surfaces of the prefaced units shall havea flame spread classification not greater than 25 without1This specification is under the jurisdiction of A
13、STM Committee C15 onManufactured Masonry Units and is the direct responsibility of SubcommitteeC15.03 on Concrete Masonry Units and Related Units.Current edition approved April 14, 2005. Published April 2005. Originallyapproved in 1973. Last previous edition approved in 2004 as C 744 04.2For referen
14、ced 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 Changes section appears at the end of this standard.Copyri
15、ght ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.evidence 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 asspecified. When tested in ac
16、cordance 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 viewed from a distance of 10
17、 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 m) under an illumination of
18、 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 dimensions of the units shallnot
19、 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 purchaser or authorized rep
20、resentative 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 asaturated condition in accor
21、dance 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 for theduration of the test pe
22、riod. 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-scribed in Table 1
23、.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 adhesion of the facing materi
24、alto 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 wear cycles.7.6 Surface Burnin
25、gDetermine 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 measurements before and after 500 h ofa
26、ccelerated 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 consisting of 0.5 g ofoil-soluble dye
27、 (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 inaccordance with Test Meth
28、od 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 following stainson each speci
29、men: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 Magic MarkerApply the Magic-Ma
30、rker 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 using anartists or similar br
31、ush.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.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-Mar
32、ker medium; clean spotting of writing pencil medium forTABLE 1 Resistance to ChemicalsChemicalDuration ofTest, hAcetic acid (CH3COOH) (5 %) 24Hydrochloric acid (HCl) (10 %) 3Potassium hydroxide (KOH) (10 %) 3Trisodium phosphate (Na3PO4)(5%) 24Hydrogen peroxide (H2O2)(3%) 24Household detergent (10 %)
33、 24Vegetable oil 24Blue-black ink 1Ethyl alcohol, industrial denatured (95 %) 3C74405210 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 shall be sound andfree of cracks
34、 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 appearance of the units when viewe
35、dfrom 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 shall be selected by thepurc
36、haser 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 requirements. If thesecond s
37、ample 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 results of the tests show thatthe
38、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 silicate masonry units; concret
39、e masonryunits; masonry units; prefaced unitsSUMMARY OF CHANGESCommittee C15 has identified the location of selected changes to this standard since the last issue (C 744 04)that may impact the use of this standard.(1) Changes were made to section 5.7 to specify how to observe specimens for soiling o
40、r spotting.(2) Changes were made to section 7.1 to remove time allowed for conducting tests.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 determinatio
41、n 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 the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdra
42、wn. Your comments are invited 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 c
43、omments 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 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).C744053
