ASTM C1231 C1231M-2014 Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete Cylinders《测定硬化混凝土筒柱压强用不粘合盖板的标准使用规程》.pdf
《ASTM C1231 C1231M-2014 Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete Cylinders《测定硬化混凝土筒柱压强用不粘合盖板的标准使用规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1231 C1231M-2014 Standard Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete Cylinders《测定硬化混凝土筒柱压强用不粘合盖板的标准使用规程》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1231/C1231M 14Standard Practice forUse of Unbonded Caps in Determination of CompressiveStrength of Hardened Concrete Cylinders1This standard is issued under the fixed designation C1231/C1231M; the number immediately following the designation indicates theyear of original adoption or, i
2、n the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice covers requirements for a capping systemusing unbonded caps for tes
3、ting concrete cylinders molded inaccordance with Practice C31/C31M or C192/C192M. Un-bonded neoprene caps of a defined hardness are permitted tobe used for testing for a specified maximum number of reuseswithout qualification testing up to a certain concrete compres-sive strength level. Above that s
4、trength, level neoprene capswill require qualification testing. Qualification testing is re-quired for all elastomeric materials other than neopreneregardless of the concrete strength.1.2 Unbonded caps are not to be used for acceptance testingof concrete with compressive strength below 10 MPa 1500 p
5、si or above 80 MPa 12 000 psi.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may
6、result in non-conformancewith the standard.1.4 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-bility of regulato
7、ry limitations prior to use. (WarningConcrete cylinders tested with unbonded caps rupture moreviolently than comparable cylinders tested with bonded caps.The safety precautions given in the Manual of Aggregate andConcrete Testing are recommended.2)2. Referenced Documents2.1 ASTM Standards:3C31/C31M
8、Practice for Making and Curing Concrete TestSpecimens in the FieldC39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC617 Practice for Capping Cylindrical Concrete SpecimensD2000 Classifica
9、tion System for Rubber Products in Auto-motive Applications3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 pad, nan unbonded elastomeric pad.3.1.2 unbonded cap, na metal retainer and an elastomericpad.4. Significance and Use4.1 This practice provides for using an unbonded capp
10、ingsystem in testing hardened concrete cylinders made in accor-dance with Practices C31/C31M or C192/C192M in lieu of thecapping systems described in Practice C617.4.2 The elastomeric pads deform in initial loading to con-form to the contour of the ends of the cylinder and arerestrained from excessi
11、ve lateral spreading by plates and metalrings to provide a uniform distribution of load from the bearingblocks of the testing machine to the ends of the concrete ormortar cylinders.5. Materials and Apparatus5.1 Materials and equipment necessary to produce ends ofthe reference cylinders that conform
12、to planeness requirementsof Test Method C39/C39M and the requirements of Practice1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand ConcreteAggregates and is the direct responsibility of Subcommittee C09.61 onTesting for Strength.Current edition approved July 1, 2014. Publ
13、ished July 2014. Originally approvedin 1993. Last previous edition approved in 2013 as C1231/C1231M 13. DOI:10.1520/C1231_C1231M-14.2Section on Safety Precautions, Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards, Vol 04.02.3For referenced ASTM standards, visit the ASTM website
14、, 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 ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Driv
15、e, PO Box C700, West Conshohocken, PA 19428-2959. United States1C617. This may include grinding equipment or capping mate-rials and equipment to produce neat cement paste, highstrength gypsum plaster, or sulfur mortar caps.5.2 Elastomeric Pads:5.2.1 Pads shall be 13 6 2mm12 6116 in. thick and thedia
16、meter shall not be more than 2 mm 116 in. smaller than theinside diameter of the retaining ring.5.2.2 Pads shall be made from polychloroprene (neoprene)meeting the requirements of Classification D2000 as follows:Shore ADurometerClassification D2000Line Call-Out50 M2BC51460 M2BC61470 M2BC714The toler
17、ance on ShoreAdurometer hardness is 65. Table 1provides requirements for use of caps made from materialmeeting the requirements of Classification D2000, above.5.2.3 Other elastomeric materials that meet the performancerequirements of qualification tests in Section 8 are permitted.5.2.4 Elastomeric p
18、ads shall be supplied with the followinginformation:5.2.4.1 The manufacturers or suppliers name,5.2.4.2 The Shore A hardness, and5.2.4.3 The applicable range of concrete compressivestrength from Table 1 or from qualification testing.5.2.5 The user shall maintain a record indicating the date thepads
19、are placed in service, the pad durometer, and the numberof uses to which they have been subjected.5.3 Retainers, are a pair of metal fixtures used to providesupport for and alignment of the neoprene pads and thecylinder ends (Note 1 and Fig. 1). Each retainer (upper andlower) includes a (retaining)
20、ring that is welded to or manu-factured integrally with a base plate. The height of the retainingring shall be 25 6 3 mm 1.0 6 0.1 in. The inside diameterof the retaining ring shall not be less than 102 % or greater than107 % of the diameter of the cylinder. The thickness of theretaining ring shall
21、be at least 12 mm 0.47 in. for 150 mm 6in. diameter retainers and at least 9 mm 0.35 in. for 100 mm4 in. diameter retainers. The surface of the base plate thatcontacts the bearing block of the testing machine shall be planeto within 0.05 mm 0.002 in. The thickness of the base plateshall be at least
22、12 mm 0.47 in. for 150 mm 6 in. retainersand at least 8 mm 0.3 in. for 100 mm 4 in. retainers. Thebearing surfaces of the retainers shall not have gouges,grooves, protrusions, or indentations greater than 0.25 mm0.010 in. deep or greater than 32 mm20.05 in.2 in surfacearea.NOTE 1Retainers made from
23、steel and some aluminum alloys havebeen found acceptable.6. Test Specimens6.1 The specimens shall be either 150 by 300 mm 6 by 12in. or 100 by 200 mm 4 by 8 in. cylinders made inaccordance with Practices C31/C31M or C192/C192M. Nei-ther end of a cylinder shall depart from perpendicularity to theaxis
24、 by more than 0.5 (Note 2). No individual diameter of acylinder may differ from any other diameter by more than 2 %.NOTE 2One method of measuring the perpendicularly of ends ofcylinders is to place a try square across any diameter and measure thedeparture of the longer blade from an element of the c
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