1、Designation:C82506(Reapproved 2011)Standard Specification forPrecast Concrete Barriers1This standard is issued under the fixed designation C825;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in par
2、entheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers precast concrete barriers,in-tended to be used adjacent to a roadway or as a median,toredirect vehicles unintentionally leavin
3、g the roadway.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standards:2A82/A82M Specification for Ste
4、el Wire,Plain,for ConcreteReinforcement(Withdrawn 2013)3A185/A185M SpecificationforSteelWeldedWireReinforcement,Plain,for Concrete(Withdrawn 2013)3A416/A416M Specification for Steel Strand,UncoatedSeven-Wire for Prestressed ConcreteA421/A421M Specification for Uncoated Stress-RelievedSteel Wire for
5、Prestressed ConcreteA496/A496M Specification for Steel Wire,Deformed,forConcrete Reinforcement(Withdrawn 2013)3A497/A497M SpecificationforSteelWeldedWireReinforcement,Deformed,for Concrete(Withdrawn2013)3A615/A615M Specification for Deformed and Plain Carbon-Steel Bars for Concrete ReinforcementA996
6、/A996M Specification for Rail-Steel and Axle-SteelDeformed Bars for Concrete ReinforcementC31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC33 Specification for Concrete AggregatesC39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC42/C42M Test
7、Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC150 Specification for Portland CementC173/C173M Test Method forAir Content of Freshly MixedConcrete by the Volumetric MethodC231 Test Method for Air Content of Freshly Mixed Con-crete by the Pressure MethodC260 Specification f
8、or Air-Entraining Admixtures for Con-creteC330 Specification for Lightweight Aggregates for Struc-tural ConcreteC494/C494M Specification for Chemical Admixtures forConcreteC595 Specification for Blended Hydraulic CementsC618 Specification for Coal Fly Ash and Raw or CalcinedNatural Pozzolan for Use
9、in Concrete3.Classification3.1 Precast concrete barriers manufactured in accordancewith this specification shall be as shown in either Fig.1or Fig.2.4.Basis of Acceptance4.1 Precast barrier shall comply with all of the provisions ofthis specification and shall be tested as prescribed in 8.3 and8.4.4
10、.1.1 Acceptance as to Strength PropertiesConcrete bar-rier shall be acceptable under the strength tests when thesections have met the requirements of Section 8.4.1.2 Acceptance as to Dimensional PropertiesConcretebarrier shall meet the dimensional tolerances of Section 9.4.1.3 Acceptance as to End R
11、esultThe concrete barriersections shall be finally acceptable to the purchaser at thedesignated point of delivery with no significant cracking.Significant cracking is defined as fractures or cracks passingthrough the section or any continuous structural crack extend-ing for a length of 12 in.(305 mm
12、)or more,regardless ofposition in the section.5.Materials5.1 CementPortland cement shall conform to the require-ments of Specification C150 or shall be portland blast-furnace1This specification is under the jurisdiction ofASTM Committee C27 on PrecastConcrete Products and is the direct responsibilit
13、y of Subcommittee C27.20 onArchitectural and Structural Products.Current edition approved May 1,2011.Published June 2011.Originallyapproved in 1979.Last previous edition approved in 2006 as C825 06.DOI:10.1520/C0825-06R11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact A
14、STM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C7
15、00,West Conshohocken,PA 19428-2959.United States1 slag cement or portland-pozzolan cement conforming to therequirements of Specification C595.5.2 AggregatesAggregates shall conform to SpecificationC33 or C330.5.3 AdmixturesAdmixtures may be used with the approvalof the purchaser.Air-entraining admix
16、tures shall conform toSpecification C260.Chemical admixtures shall conform toSpecification C494/C494M.Fly ash or other pozzolanic ad-mixtures shall conform to Specification C618.Admixturescontaining chlorides shall not be used in the manufacture ofprestressed barrier sections.5.4 Steel ReinforcementSteel reinforcement shall consistof wire fabric conforming to Specifications A185/A185M orA497/A497M,or of wire conforming to Specifications A82/A82M,A421/A421M,or A496/A496M,or of strand conform-ing
