1、Designation: D3423/D3423M 84 (Reapproved 2011)1Standard Practice forApplication of Emulsified Coal-Tar Pitch (Mineral ColloidType)1This standard is issued under the fixed designation D3423/D3423M; the number immediately following the designation indicates theyear of original adoption or, in the case
2、 of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEUnits information was editorially revised in June 2011.1. Scope1.1 This practice covers the applica
3、tion of mineral-colloid-stabilized, emulsified coal-tar pitch meeting the requirementsof Specification D3320, as a weather protection and aliphatic-solvent-resistant sealer for use on bituminous pavements ofairports, parking lots, and driveways.1.2 The values stated in either SI units or inch-pound
4、unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 This standard does not purport to addr
5、ess all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D3320 Specific
6、ation for Emulsified Coal-Tar Pitch (MineralColloid Type)3. Preparation of Surface3.1 Old Asphalt Surfaces (those which have weathered overa change of seasons):3.1.1 Repair and patch all pavement defects. If a solventcontaining cold-applied material is used, this should be done aminimum of 90 days p
7、rior to the planned application of thesealer to permit solvent escape before sealing.3.1.2 Thoroughly inspect the pavement surface for minorcracks or other imperfections. Ignore hairline cracks. Openminor cracks (less than 12.7 mm 12 in.) to a minimum depthand width of 12.7 mm and fill with a crack
8、filler approved bythe manufacturer of the sealer. Wider cracks, along with soft orsunken spots, indicate that the pavement or the pavement baseshould be repaired or replaced.3.1.3 Treat old, badly oxidized asphalt pavement or asphaltpavement that has lost binder by erosion leaving exposedaggregate w
9、ith a prime coat recommended by the sealermanufacturer after all loose aggregate is removed. This primecoat is to dry thoroughly before proceeding.3.1.4 Immediately prior to application of the sealer, cleanthe surface of all loose dust, dirt, leaves, and other foreignmaterials by sweeping, by flushi
10、ng well with water, or acombination of both.3.1.5 Remove oil or grease that has not penetrated theasphalt pavement by scrubbing with a detergent until a water-break-free surface is obtained after thorough flushing withclear water. If cleaning is unable to produce a true “water-break-free” surface, a
11、nd the size of the unsatisfactory area istoo small to warrant replacement as described in 3.1.1, thequestionable area should be treated with a spot sealer as per thepavement sealer manufacturers recommendation. Do not useonly solvents to remove oil or grease as the solvents may affectadhesion of the
12、 sealer.3.1.6 Remove and patch pavement that has been penetratedby oil and grease in accordance with the precautions describedin 3.1.1 if a cold patch is required.3.1.7 Treat old parking and traffic control lines with a primecoat. If control lines are excessively built-up from multipleapplications,
13、abrade to the pavement surface before applicationof the prime coat.3.2 New Asphalt Surfaces:3.2.1 Allow conventional hot-mix asphalt surfaces to age aminimum of 30 days prior to the application of the sealer.1This practice is under the jurisdiction ofASTM Committee D08 on Roofing andWaterproofing an
14、d is the direct responsibility of Subcommittee D08.09 on Bitumi-nous Emulsions.Current edition approved May 1, 2011. Published June 2011. Originallyapproved in 1975. Last previous edition approved in 2003 as D3423 84 (2003).DOI: 10.1520/D3423_D3423M-84R11E01.2For referenced ASTM standards, visit the
15、 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, U
16、nited States.3.2.2 Before application of sealer over a pavement con-structed by the use of solvent-containing cold-mix asphalt, agethe pavement a minimum of 90 days. A careful review andinspection of the pavement should be made by the supplier toensure that all solvents have escaped prior to applica
17、tion of thesealer.3.2.3 Extend the curing period for new asphalt surfacesduring cool or cold weather.3.2.4 The surface should be clean and free from oil andgrease (see 3.1.4, 3.1.5, and 3.1.6).4. Preparation of Emulsion4.1 Stir the emulsion to a uniform consistency prior to use.Mechanical mixing is
18、preferred as it will lessen the stirringtime and usually result in a more uniform mix.4.2 Coal-tar pitch emulsion sealers normally require nodilution and should be applied directly as they come from thecontainers unless otherwise specifically recommended by themanufacturer.4.3 It may be necessary to
19、 add sand to the top coat of theemulsion prior to application in order to provide addedtraction. This sand (No. 2 blast sand unless otherwise desig-nated by the emulsion manufacturer) should meet the followingrequirements:Sieve Size % Passing1.18-mm No. 16 100850-m No. 20 85 to 100425-m No. 40 0 to
20、15150-m No. 100 0 to 54.3.1 Clean sand should be uniformly blended with thesealer using 240 to 720 g/L 2 to 6 lb/gal. Stirring throughoutthe application period is necessary to ensure proper dispersion.Small additional increments of water may be needed to providea workable consistency.5. Application
21、of Emulsion5.1 First Coat:5.1.1 Unless previously primed as specified by the sealermanufacturer, uniformly dampen the clean bituminous surfacewith clean water to provide maximum adhesion. The surface isproperly dampened when no free water appears on the palm ofthe hand after firmly pressing against
22、the pavement, yet it hasa wet appearance.5.1.2 On unprimed surfaces, thin the first coat of sealer nomore than 15 % with clean water prior to application by brush,squeegee, or spray at the rate of 3.1 m2/L 125 ft2/gal, or asspecified by the manufacturer. Actual coverage obtained willdepend on the te
23、xture and porosity of the pavement beingsealed.5.1.3 On primed surfaces, apply the sealer as it comes fromthe container unless otherwise specifically recommended bythe manufacturer.5.1.4 Allow sealer to dry and cure sufficiently to allow foottraffic on sealed pavement before applying second coat. Th
24、etime required could be as short as three hours under the mostideal conditions and as long as 36 h or more when conditionsare unfavorable. Sheltered or shady areas will normally requirea longer drying period.5.2 Second Coat:5.2.1 Normally the surface need not be dampened (see 6.3)prior to applicatio
25、n of the second coat.5.2.2 Apply the second coat at right angles to the first coatat the rate of 2.5 m2/L 100 ft2/gal or as specified by themanufacturer, using brush, squeegee, sealing machine, ordistributor.5.2.3 When the second coat has thoroughly dried and cured(24 to 48 h under favorable conditi
26、ons), the sealed surface maybe opened to traffic.6. Application Precautions6.1 Pavement sealer should not be applied during rainy orwet weather, or when rain is anticipated within 8 h afterapplication is completed.6.2 Sealer should not be applied unless pavement tempera-ture is at least 7C 45F and t
27、he air temperature is 7C andrising. It is best applied when the air and pavement surface arebetween 10 and 27C 50 and 80F and at least3hofsunlightwill remain upon completion of the application.6.3 Sealer should never be applied to hot, dry surfaces underthe summer sun. Hot surfaces should first be c
28、ooled with cleanwater (see 5.1.1).6.4 Adequate drying time must be allowed between coatsand before use (see 5.1.4 and 5.2.3), otherwise pickup ortracking may result.6.5 Since an emulsion may be damaged by freezing, itshould be protected at all times when the temperature dropsbelow 4C 40F.ASTM Intern
29、ational 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 any such patent rights, and the riskof infringement of such rights, are entirely t
30、heir 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 invited either for revision of this standard or for additional standardsand shoul
31、d 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 received a fair hearing you shouldmake your views known to the ASTM Committee on Stand
32、ards, 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D3423/D3423M 84 (2011)12
