1、Designation: A 862/A 862M 98 (Reapproved 2008)Standard Practice forApplication of Asphalt Coatings to Corrugated Steel Sewerand Drainage Pipe1This standard is issued under the fixed designation A 862/A 862M; the number immediately following the designation indicates the yearof original adoption or,
2、in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice covers the post coating of corrugated steelpipe and corrugated str
3、uctural steel plate with asphalt materi-als. This practice is intended for shop-applied coating only.1.2 The values stated in either inch-pound units or SI unitsshall be regarded separately as standard. The values stated ineach system are not exact equivalents; therefore, use eachsystem independentl
4、y of the other, without combining values inany way. The SI units are shown in brackets in the text forclarity, but they are the applicable values when the applicationis to be performed using SI units.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its
5、 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:2A 849 Specification for Post-Applied Coatings, Pavings,and Linings for C
6、orrugated Steel Sewer and Drainage Pipe3. Significance and Use3.1 Asphalt coating is used to provide additional protectionfor corrugated steel products (product) in corrosive or abrasiveenvironments, or both.4. Classification4.1 This practice covers three separate and distinct classifi-cations of co
7、atings. The general conditions under which thesecoatings are used are described in Specification A 849.4.1.1 Classification A, Asphalt CoatedA uniform coatingis applied to the interior and exterior of the product.4.1.2 Asphalt Coated with Paved Invert:4.1.2.1 Classification B1, Asphalt, Half Coated
8、with PavedInvertA uniform coating is applied to the interior andexterior of the pipe covering at least 50 % of the circumferenceon the lower portion of the pipe as installed, and then a pavingis applied on the lower portion of the interior of the pipe asinstalled (the invert) to provide a smooth flo
9、w line.4.1.2.2 Classification B2, Asphalt, Fully Coated with PavedInvertA uniform coating is applied to the interior andexterior of the pipe, and then a paving is applied on the lowerportion of the interior of the pipe as installed (the invert) toprovide a smooth flow line.4.1.3 Classification C, As
10、phalt Coated and LinedA uni-form coating is applied to the interior and exterior of the pipe,and then a lining is applied to fill the corrugations on the fullinterior of the pipe to provide a smooth interior.NOTE 1This coating is sometimes referred to as any of the following:asphalt coated and lined
11、, asphalt coated and fully paved, asphalt coatedand 100 % paved, or asphalt coated smooth flow. The term “bituminous”is sometimes used instead of asphalt.5. Materials5.1 The coating and lining material shall be in conformancewith the requirements for asphalt material in SpecificationA 849.6. Tank Co
12、ntrol and Maintenance6.1 Tank TemperatureThe asphalt temperature in the tankshall be maintained between 392 and 410F 200 and 210Cduring the coating operation.6.2 Tank Cleanliness:6.2.1 The asphalt in the tank shall be kept free of contami-nants such as dirt, drum paper, and asphalt drippings from th
13、eshop floor.6.2.2 The asphalt tank shall be cleaned as necessary with aminimum frequency of once per year.1This practice is under the jurisdiction of ASTM Committee A05 on Metallic-Coated Iron and Steel Products and is the direct responsibility of SubcommitteeA05.17 on Corrugated Steel Pipe Specific
14、ations.Current edition approved May 1, 2008. Published July 2008. Originally approvedin 1986. Last previous edition approved in 2003 as A 862/A 862M - 98(2003).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of
15、 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.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2.3 The foam that
16、results from the inadvertent introduc-tion of moisture to the tank shall be skimmed off or moved tothe side of the tank before inserting or extracting the product.7. Procedure7.1 Coating ApplicationApply the asphalt coating byinserting the product into the bath twice; the first applicationresults in
17、 a thin coating to achieve very good adherence, andthe second achieves the coating thickness required by Specifi-cation A 849.7.1.1 Steel surfaces shall be free of dirt, grease, dust, andmoisture before placement in the asphalt bath. The productshall be prepared immediately prior to the coating oper
18、ation.7.1.2 Rotate large structures in the tank to ensure that allsurfaces are coated.7.1.3 The product must remain in the tank until it achievesa minimum temperature of 375F 190C. The specific timerequirements will depend on factors unique to each operationand the product being coated. The time to
19、reach the requiredtemperature is dependent on the initial temperature of theproduct, the steel thickness, the size of the product, and thevolume of the tank.7.1.4 The following table contains minimum immersiontimes:Steel Thickness, in. mm Time, min0.052 1.32 2 to 2.50.064 1.63 2.5 to 30.079 2.01 3.5
20、 to 50.109 2.77 5 to 60.138 3.50 6.5 to 80.168 4.27 8 to 147.1.5 Cool the product to ambient temperature before appli-cation of the second coating.7.1.6 Insert the product a second time to provide theminimum thickness on each surface.7.2 Paving:7.2.1 Pave the interior of the coated pipe by applying
21、the hotasphalt from the tank to the interior surface of the pipe toprovide a thickness over the crest of the corrugation as requiredby Specification A 849. Pump the hot asphalt to the pipe byappropriate mechanical means, not by transfer with buckets.The asphalt used for paving shall be a least 395F
22、200C toensure good adhesion to the coated pipe. Pave the pipe as soonas possible after coating to avoid poor adhesion associated withthe accumulation of dirt and other residue on the coatingsurface.NOTE 2Steam, hot oil jacketing, or high-temperature electric tape isrecommended to keep the asphalt sy
23、stem free flowing. For furtherinformation on the selection of application equipment, consult a producerof asphalt products.7.2.2 Place end dams of wood or heavy paper at the ends ofthe pipe to retain the asphalt in the pipe. Three or moreapplications are usually required for most operations.7.3 Smoo
24、th Lining:7.3.1 Line the interior of the pipe that has been coated bycovering the corrugations with hot asphalt. Provide a thicknessover the crest of the corrugations as required by SpecificationA 849.7.3.2 Spray the hot asphalt, taken from the tank, whilerotating the pipe on a powered rotary device
25、 to provide auniform smooth lining.7.4 Storage and Handling:7.4.1 Store and handle the coated product properly to avoidbruising, scaling, or scuffing of the asphalt coating. At thefabricators option, spray inorganic materials such as lime(whitewash), chalk, or silica dust on the exterior asphaltsurf
26、aces after cooling to prevent removal of the tacky coatingwhen sections of pipe are stored in contact with each other.These inorganic coatings also help to lower the surfacetemperature of the pipe during storage.7.4.2 Install and backfill asphalt-coated corrugated steelproduct as soon as possible to
27、 avoid the damage due to infraredradiation. Infrared radiation volatizes the thin oils in the asphaltwhich dries the coating and promotes cracking. Product in-stalled in situations where prolonged exposure to the suns raysis unavoidable (that is, aerial sewer), and cracking of theasphalt coating is
28、possible, shall be coated with supplementalcoatings such as aluminum-rich paints.7.5 RepairRepair damaged coatings with a cold-appliedasphalt mastic material described in Specification A 849.8. Keywords8.1 asphalt coated steel pipe; asphalt coating; asphalt coat-ing repair; coating application; corr
29、ugated steel pipe; pavedinvert; protective coatings; smooth linedA 862/A 862M 98 (2008)2SUMMARY OF CHANGESThis section identifies the principal changes to this standard that have been incorporated since the last issue.(1) General revisions have been made to the text to betterorganize it and to clari
30、fy meanings.(2) Coating classifications describe the application of thecoating rather than the use of the product.(3) General conditions under which the coatings can be usedare described in Specification A 849.(4) The coating classification “Asphalt Coated with PavedInvert” has been split into two s
31、ubclassifications.(5) The term “bituminous” has been replaced by the term“asphalt” in all cases, since there are some bituminous mate-rials that are carcinogenic and the actual material used isasphalt.(6) The term “product” has been used as the general descriptorfor the material being coated. This w
32、as done to differentiatebetween cases where only pipe is the product being coated andwhere corrugated structural place can be coated.(7) A section describing “General Requirements” has beenremoved, since the items listed were detailed in the subsequentparagraphs.(8) The keywords paragraph has been s
33、ignificantly revised.(9) A Summary of Changes has been added.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 determination of the validity of any such p
34、atent 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 withdrawn. Your comments are invited e
35、ither 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 comments have not received a fai
36、r 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).A 862/A 862M 98 (2008)3
