1、Designation: D868 10Standard Practice forDetermination of Degree of Bleeding of Traffic Paint1This standard is issued under the fixed designation D868; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A nu
2、mber in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice describes test procedures for determiningthe degree of bleeding of traffic or pavement marking paints. Aspecific formulatio
3、n for a solventborne traffic paint formulationis included as a potential bleeding reference control1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if
4、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:2D226 Specification forAsphalt-Saturated Organic
5、Felt Usedin Roofing and WaterproofingD227 Specification for Coal-Tar-Saturated Organic FeltUsed in Roofing and WaterproofingD476 Classification for Dry Pigmentary Titanium DioxideProductsD867 Specification for Pumice Pigment3D1199 Specification for Calcium Carbonate PigmentsD2244 Practice for Calcul
6、ation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesE1347 Test Method for Color and Color-Difference Mea-surement by Tristimulus Colorimetry3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 bleeding characteristic, nthat condition of disco
7、l-oration manifested in traffic paint when applied to tar orasphaltic-type substrates.3.1.1.1 DiscussionThe amount of discoloration can becomparing the color of the test coating and a specific referencecoating using colorimetric measurements or by visual compari-son to the amount of bleeding in a re
8、ference photograph.4. Significance and Use4.1 Solvents in a traffic paint may cause bleeding ofpavement constituents into the traffic marking, thereby render-ing the traffic marking less effective as a lane or directionalindicator. This practice describes how to prepare a panel of thecoating to be t
9、ested and a reference panel coated with a specificsolventborne traffic paint to be used as a control for evaluation.4.2 This practice can be particularly useful for evaluation ofsolventborne traffic paints, but it may also be used for othertypes of traffic markings including waterborne traffic paint
10、s.4.3 Two basic procedures are described for measuring theamount of bleeding. The procedure used shall be agreed uponby the purchaser and seller.5. Apparatus5.1 Film ApplicatorA conventional type drawdown gagethat casts a film having a minimum width of 50 mm (2 in.) andan approximate wet thickness o
11、f 380 m (15 mils) (using anapplicator clearance of approximately 760 m (30 mils).5.2 Test Panel for Coal-Tar SubstrateA 127 by 254-mm(5 by 10-in.) piece cut from a standard roll of so-called “6.8-kg(15-lb) coal-tar saturated heat resistant or rag felt.” Unlessotherwise specified, use a Specification
12、 D227 coal tar saturatedfelt.5.3 Test Panel for Asphalt SubstrateA 127 by 254-mm (5by 10-in.) piece cut from a standard roll of 6.8-kg (15-lb)asphalt-saturated felt. Unless otherwise specified, use a Speci-fication D226 (Type 1) asphalt saturated felt.5.4 Paint Composition for Use as a ControlThe pa
13、intcomposition shown in Table 1 can be used as a control whenapplied to 6.8 kg (15 lb) felt. This formulation will show severe1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D0
14、1.44 on Traffic Coatings.Current edition approved July 1, 2010. Published September 2010. Originallyapproved in 1946. Last previous edition approved in 2003 as D868 85 (2003).DOI: 10.1520/D0868-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service a
15、t serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, We
16、st Conshohocken, PA 19428-2959, United States.bleeding when applied on a coal tar substrate and a somewhatlower degree of bleeding when applied on the asphalt feltsubstrate.6. Preparation of Test Panels6.1 Cut 125 by 255 mm (5 by 10 in.) pieces from a roll ofcoal tar or asphalt substrate. The specim
17、ens shall be cut at least127 mm (5 in.) in from the edge.6.2 Prepare the non-bleeding contrast surface by attaching a25 mm (1 in.) of cellophane tape to the coal tar or asphaltsubstrate piece using firm pressure. The tape shall be posi-tioned so that the outside edge is at least 25 mm (1 in.) from t
18、heedge and parallel to the edge of the substrate piece.7. Procedure7.1 Place the test panel on a smooth flat surface (such as aglass panel), with the tape side up on the left, and hold in a flatposition by weighting down the edges.7.2 Draw the paint under test down over the specimen panelin such a m
19、anner that the entire width of the tape is covered,leaving the remainder of the film to the right of the tape indirect contact with the test panels. Apply the paint under test ata thickness to ensure complete hiding.7.3 Keep the coated panel in a flat position until the film isset (after which the w
20、eights may be removed) and allow thecoated panel to dry for 48 h at 21 to 27C (70 to 80F).7.4 Immediately after completion of 48-h drying, determinethe contrast in color between the portion of the film over thetape and that portion that is in direct contact with the test panelsusing one of the follo
21、wing two procedures. The procedure usedshall be agreed upon by purchaser and seller.7.4.1 Procedure A:7.4.1.1 Measure color in accordance with Test MethodE1347 in the non-bleed reference area and in the area wherebleeding is allowed to occur. Make these measurements in atleast three positions in bot
22、h the non-bleed reference area and inthe area where bleeding is allowed to occur. Determine theratio between the CIE L* value measured for the area wherebleeding is allowed to the CIE L* value measured in thenon-bleed reference area. Calculate the average of these ratios.7.4.1.2 Alternatively, deter
23、mine the delta E in accordancewith Practice D2244 for the area where bleeding is allowed tooccur compared to the non-bleed reference area. Calculate theaverage of the delta E values.7.4.2 Procedure B:7.4.2.1 Visually compare the contrast between the non-bleed reference area and the area where bleedi
24、ng is allowed tooccur to the reference photograph in Fig. 1.TABLE 1 Control Paint Formulation for Felt SubstratesMaterial Weight PercentTitanium dioxide, TiO2 (Classification D476, Type II, Class II) 15.40 %Calcium carbonate, CaCO3, conforming to Specification D1199 44.00 %Aluminum stearate (a 5 % m
25、ixture in toluene shall gel attemperatures below 49.9C (120F)0.15 %Pumice, No. 100 conforming to Specification D867 6.16 %Alkyd resin solution, pure oxidizing 52 % modified soya oil, 50 %solution in 36 K.B. mineral spirits29.89 %V.M. traffic paintASTM International takes no position respecting the v
26、alidity 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 their own responsibility.This standard is s
27、ubject 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 should be addressed to ASTM International Headq
28、uarters. 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 Standards, at the address shown below.This stan
29、dard 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/).D868 103
