1、Designation: C 875 98 (Reapproved 2003)e1Standard Specification forAsbestos-Cement Conduit1This standard is issued under the fixed designation C 875; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numb
2、er in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEAsbestos warning was moved from 10.2.1 to 1.3 in September 2004.1. Scope1.1 This specification covers asbestos-cement conduit foruse in electric
3、-power systems and communication systems.The service is for both underground and exposed conditions.1.2 The values stated in SI units are to be regarded as thestandard. The values stated in parentheses are provided forinformation only.1.3 WarningBreathing of asbestos dust is hazardous.Asbestos and a
4、sbestos products present demonstrated healthrisks for users and for those with whom they come into contact.In addition to other precautions, when working with asbestos-cement products, minimize the dust that results. For informa-tion on the safe use of chrysoltile asbestos, refer to “Safe Useof Chry
5、sotile Asbestos: A Manual on Preventive and ControlMeasures.”21.4 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
6、-bility of regulatory limitations prior to use. See 1.3 for specifichazard warning.2. Referenced Documents2.1 ASTM Standards:3C 150 Specification for Portland CementC 458 Test Method for Organic Fiber Content of Asbestos-Cement ProductsC 500 Test Methods for Asbestos-Cement PipeC 595 Specification f
7、or Blended Hydraulic CementsC 618 Specification for Fly Ash and Raw or CalcinedNatural Pozzolan for Use as a Mineral Admixture inPortland Cement ConcreteD 2946 Terminology Relating to Asbestos and Asbestos-Cement Products2.2 Military Standard:MIL-STD-129 Marking for Shipment and Storage42.3 Federal
8、Standard:Fed. Std. No. 123 Marking for Shipment (Civil Agencies)42.4 Other Standards:Uniform Freight Classification Rules5National Motor Freight Classification Rules6AIA, RCP2, Asbestos-Cement Products3. Terminology3.1 Definitions:3.1.1 conduit, nasbestos-cement pipe used to protectwires for electri
9、c-power or communication systems, for bothunderground and exposed situations.3.1.2 couplingcomponent made from a larger diameterpipe of the same type or Type II and of the same class or ahigher class, or produced otherwise to yield at least equalperformance, for joining asbestos-cement pipe that whe
10、nproperly installed, forms a silt-tight joint, allows alignmentcorrections and slight changes in direction, and provides anassembled joint equivalent in serviceability and strength to thepipe sections.3.1.3 fittingsfittings such as adapters, reducers, increasers,bends, and bell ends, for use in layi
11、ng asbestos-cement conduitas described in Section 5 and made to such dimensions as willprovide equivalent strength and silt-tight joints when as-sembled with the conduit.3.1.4 lota lot as used herein is defined as each 1000lengths of conduit or less, of a given class, type, and sizemanufactured on o
12、ne machine during a 24-h period.1This specification is under the jurisdiction of ASTM Committee C-17 onFiber-Cement Products and is the direct responsibility of C17.03 on Asbestos-Cement Products.Current edition approved Sept. 10, 1998. Published March 1999. Originallypublished as C 875 77. Last pre
13、vious edition C 875 92(1997).2Available from The Asbestos Institute, http:/ referenced 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 AST
14、M website.4Available from Standardization Documents Order Desk, Bldg. 4, Section D,700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.5Available from the Uniform Classification Commission, Room 1106, 222 S.Riverside Plaza, Chicago, IL 60606.6Available from National Motor Freight Inc., 1616 “
15、P St. NW, Washington,DC 20036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.2 Additional terminology is given in TerminologyD 2946.4. Classification4.1 The classes of conduit shall be as follows:Class BIntended for use encased in
16、 concrete after instal-lation.Class CIntended for use without concrete encasement, orfor exposed services.4.2 The types of conduit shall be known as Type I and TypeII corresponding to the chemical requirements given in Section6 of this specification. For a more thorough understanding andas a guide t
17、o the chemical resistance of asbestos-cementconduit, reference is made to Test Methods C 500.NOTE 1To assist the purchaser in choosing the type of conduit mostsuitable for his use, the following descriptions of usage may be consid-ered:Type IFor use where nonaggressive water and soil of moderatesulp
18、hate content are expected to come in contact with the conduit.Type IIFor use where moderately aggressive water or water and soilof high sulphate content, or both, are expected to come in contact with theconduit.4.3 The conduit shall be furnished in 40, 50, 75, 100, and150 mm (1.5, 2, 3, 4, 5, and 6-
19、in.) nominal sizes and shall havea circular cross section.5. Materials and Manufacture5.1 Asbestos-cement conduit shall be composed of an inti-mate mixture of portland cement conforming to SpecificationC 150, or portland slag or pozzolan cements conforming toSpecification C 595, and asbestos fiber w
20、ith or without finelydivided silica or silica-containing mineral additives conform-ing to Specification C 618 that can react to form calciumsilicate reaction products; and asbestos fiber. The mixture shallnot contain more than 0.2 % of non-deleterious organic com-ponents as determined by Test Method
21、 C 458. The materialshall be of laminar construction formed under pressure to ahomogeneous structure and cured to meet the physical andchemical requirements of this specification.6. Chemical Composition6.1 When tested in accordance with Test Methods C 500,the amount of uncombined calcium hydroxide s
22、hall not exceed1.0 % for Type II conduit 2There are no chemical require-ments for Type I conduit.7. Mechanical Properties7.1 Flexural Strength:7.1.1 Each 3 or 4-m (10 or 13-ft) standard length and each2.9 m (9.5 ft) or longer random length conduit shall havesufficient flexural strength to withstand,
23、 without failure, thetotal load prescribed in Table 1, when tested in accordance with7.1.1.1.7.1.1.1 The specimen shall be mounted longitudinally on“V” blocks, preferably of hard wood or of steel, 5 cm (2 in.)long, 2 rad (120) angle of “V,” faces 13 3 5cm(53 2 in.),and the load applied through a rec
24、tangular block, 5 cm (2 in.)in width, at the center of the span. The spans between the facesof supporting blocks shall be as given in Table 1 for theparticular class of conduit. The breaking loads, the average ofat least two specimens from each length, shall not be less thanthose given in Table 1 fo
25、r the particular class of conduit.7.2 Crushing StrengthCrushing tests shall be conductedbefore shipment. Thirty-centimetre (1-ft) lengths of conduit cutfrom the unmachined portion of the conduit shall have theminimum crushing strength prescribed in Table 2, when testedin accordance with Test Methods
26、 C 500.8. Dimensions, Mass, and Permissible Variations8.1 The average inside diameter measured at the end of theconduit shall be 63mm(60.1 in.) of the nominal insidediameter.8.2 The bore of the conduit shall pass freely through amandrel1m(3ft)long and 6 mm (0.25 in.) less in diameterthan the nominal
27、 inside diameter of the conduit.8.3 The inner dimensions of the bends shall be such that aball 1 cm (0.4 in.) less in diameter than the nominal insidediameter of the conduit, shall pass freely through them.8.4 Couplings and coupling areas of the conduit shall bemachined or otherwise finished to such
28、 dimensions as willprovide silt-tight joints when assembled with proper accesso-ries and put into the service for which the conduit is intended.8.5 The standard lengths of conduit shall be 1.5, 2, 3, or 4 m6 2.5 cm (5, 6.5, 10, or 13 ft 6 1 in.). At least 85 % of the totallength of any one class, ty
29、pe, and size shall be furnished instandard lengths. The remaining 15 % may be in randomlengths if not less than 1.5 m (5 ft) for standard 3 and 4-m (10and 13-ft) lengths, or less than1m(3ft)forstandard 2 and1.5-m (6.5 and 5 ft) lengths.9. Workmanship, Finish, and Appearance9.1 Machined ends of the c
30、onduit that receive the couplingshall be free of dents and gouges that will affect the silt-tightness of the joint.TABLE 1 Flexural Strength RequirementsNominal Inner Diameter Test Span (Free Span) Class B Applied Test Load Class C Applied Test Loadmm (in.) mm (in.) kN (lbf) kN (lbf)40 (1.5) 760 (30
31、) 2.7 (600) 3.8 (850)50 (2) 760 (30) 2.7 (600) 3.8 (850)75 (3) 762 (30) 2.7 (600) 3.8 (850)100 (4) 762 (30) 4.4 (980) 5.6 (1260)130 (5) 1219 (48) 4.9 (1100) 6.7 (1500)150 (6) 1372 (54) 5.8 (1300) 8.9 (2000)C 875 98 (2003)e129.2 Each conduit shall be free of bulges, dents, and tears onthe inside surf
32、ace that result in a variation of more than 5 mm(0.2 in.) from the adjacent unaffected portions of the surface.9.3 All inside edges of the conduit shall be rounded andsmooth. The ends of each length of conduit shall be at rightangles to the axis of the conduit.10. Sampling10.1 Test all material unde
33、r this specification in a normalair-dried condition in equilibrium with atmospheric humidity.10.2 For the flexural test, two specimens shall be cut fromone full length of conduit from each lot.10.2.1 Warningsee 1.3.10.3 For the crushing test, two specimens shall be cut fromone full length of conduit
34、 from each lot.10.4 When uncombined calcium hydroxide tests are re-quested (Section 6), one sample shall be taken from each lot ofconduit. The sample to be tested may be taken from any one ofthe specimens selected for the crushing test.11. Inspection11.1 All material furnished under this specificati
35、on shallconform to the physical and chemical requirements statedherein and may be subject to factory inspection by thepurchaser. All conduit shall be inspected by the manufacturerfor compliance to dimensional tolerances and workmanship.The manufacturer shall accept to certify that his productconform
36、s to the requirements of this specification.11.2 On orders requiring inspection by the purchaser, themanufacturer shall arrange the time of testing so that thepurchaser or his authorized inspector may be present to witnesssuch tests at the purchasers expense. The conduit to be testedwill already hav
37、e passed the routine inspection and testing ofthis specification. The number of tests to be conducted forflexural strength and crushing strength shall be limited to amaximum of one sample per each 1000 standard lengths ofeach size, type, and class of conduit on the order. If uncom-bined calcium hydr
38、oxide tests are required, the numbers oftests shall be one for each size, type, and class of pipe on theorder. The purchaser or his authorized inspector may select theconduit to be tested.12. Rejection and Rehearing12.1 Failure of any specimen tested for flexural and crush-ing strength to withstand
39、75 % of the load specified in Section7 shall be cause for rejection of the lot from which the testspecimen was taken. When any specimen tested for flexural orcrushing strength withstands over 75 % but under 100 % of theload specified in Section 7, one specimen shall be cut fromeach of two additional
40、 conduits of the same lot. Failure ofeither of these additional specimens to meet the strengthrequirements of Section 7 shall be cause for rejection of theentire lot from which the original sample was taken.12.2 If the results of the uncombined calcium hydroxide testshow the sample failed to meet th
41、e specification requirements,two additional specimens shall be selected and sampled fortest. The failure of one of these two additional samples to meetthe specification requirements of Section 6 shall be cause forrejection of the lot.13. Product Marking13.1 Each standard and random length of conduit
42、 shall bemarked by the manufacturer with the trade name, nominal size,type, class, and the date of manufacture, in alkali resistant inkor indelible paint. Each carton containing coupling sleevesshall be marked by the manufacturer with the nominal size,type, and class for the conduit with which it sh
43、all be used.14. Packaging14.1 Conduit and couplings shall be prepared for commer-cial shipment so as to ensure acceptance by common or othercarriers.14.2 Refer also to S1.1.15. Keywords15.1 asbestos; asbestos-cement; conduit; specificationTABLE 2 Crushing Strength RequirementsNominalDiameterMinimum
44、Crushing Loadsmm (in.) Class B Class CkN (lbf) kN (lbf)40 (1.5) 2.2 500 5.3 120050 (2) 2.2 500 5.3 120075 (3) 2.2 500 5.3 1200100 (4) 2.2 500 5.3 1200130 (5) 2.2 500 4.0 900150 (6) 2.2 500 3.6 800C 875 98 (2003)e13SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply when ma
45、terial is supplied under thisspecification for U.S. Government procurement.S1. Packaging for U.S. GovernmentS1.1 Unless otherwise specified in the contract, the materialshall be packaged in accordance with the producers standardpractice which will be acceptable to the carrier at lowest rates.Contain
46、ers and packing shall comply with Uniform FreightClassification Rules or National Motor Freight ClassificationRules. Marking for shipment of such material shall be inaccordance with Fed. Std. No. 123 for civil agencies andMIL-STD-129 for military agencies.S2. Responsibility for InspectionS2.1 Unless
47、 otherwise specified in the contract or pur-chaseorder, the producer is responsible for the testing of all materialto assure compliance with the requirements specified herein.Except as otherwise specified in the contract or order, theproducer may use his own or any other suitable facilities for thep
48、erformance of the inspection and test requirements specifiedherein, unless disapproved by the purchaser. The purchasershall have the right to perform any of the inspections and testsset forth in this specification where such inspections aredeemed necessary to assure that material conforms to pre-scr
49、ibed requirements.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 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 wit
