1、Designation: D 3423 84 (Reapproved 2003)Standard Practice forApplication of Emulsified Coal-Tar Pitch(Mineral Colloid Type)1This standard is issued under the fixed designation D 3423; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the application of mineral-colloid-stabilized, emulsified coal-tar pitch meeting th
3、e requirementsof Specification D 3320, 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 SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1
4、.3 This standard does not purport to address 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 Do
5、cuments2.1 ASTM Standards:D 3320 Specification for Emulsified Coal-Tar Pitch (Min-eral Colloid Type)23. 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 use
6、d, this should be done aminimum of 90 days prior 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 dep
7、thand width of 12.7 mm and fill with a crack 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
8、 binder by erosion leaving exposedaggregate with 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
9、other foreignmaterials by sweeping, by flushing 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
10、 produce a true “water-break-free” surface, and 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 gre
11、ase as the solvents may affectadhesion of the 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 exc
12、essively built-up from multipleapplications, 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.3.2.2 Before application of sealer over a pavem
13、ent 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 application of thesealer.3.2.3 Extend the curing period for new asp
14、halt 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).1This practice is under the jurisdiction of ASTM Committee D08 on Roofing andWaterproofing and is the direct responsibility of Subcommittee D08.09 on Bitumi-nous Emuls
15、ions.Current edition approved July 10, 2003. Published July 2003. Originallyapproved in 1975. Last previous edition approved in 1998 as D 3423 84 (1998)e1.2Annual Book of ASTM Standards, Vol 04.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Un
16、ited States.4. Preparation of Emulsion4.1 Stir the emulsion to a uniform consistency prior to use.Mechanical mixing is 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
17、as they come from thecontainers unless otherwise specifically recommended by themanufacturer.4.3 It may be necessary to 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 manufacture
18、r) should meet the followingrequirements:Sieve Size % Passing1.18-mm (No. 16) 100850-m (No. 20) 85 to 100425-m (No. 40) 0 to 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 necessar
19、y to ensure proper dispersion.Small additional increments of water may be needed to providea workable consistency.5. Application 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 m
20、aximum adhesion. The surface isproperly dampened when no free water appears on the palm ofthe hand after firmly pressing against 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
21、, or spray at the rate of 3.1 m2/L (125 ft2/gal), or asspecified by the manufacturer. Actual coverage obtained willdepend on the texture 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 m
22、anufacturer.5.1.4 Allow sealer to dry and cure sufficiently to allow foottraffic on sealed pavement before applying second coat. Thetime 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
23、normally requirea longer drying period.5.2 Second Coat:5.2.1 Normally the surface need not be dampened (see 6.3)prior to application 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,
24、 squeegee, sealing machine, ordistributor.5.2.3 When the second coat has thoroughly dried and cured(24 to 48 h under favorable conditions), 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 antic
25、ipated within 8 h afterapplication is completed.6.2 Sealer should not be applied unless pavement tempera-ture is at least 7C (45F) and the 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
26、 completion of the application.6.3 Sealer should never be applied to hot, dry surfaces underthe summer sun. Hot surfaces should first be cooled 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 resu
27、lt.6.5 Since an emulsion may be damaged by freezing, itshould be protected at all times when the temperature dropsbelow 4C (40F).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 ar
28、e 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 the responsible technical committee and must be reviewed every five years andif not
29、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 receive careful consideration at a meeting of theresponsible technical committee, which yo
30、u 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 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).D 3423 84 (2003)2
