ASTM D7958 D7958M-2017 0000 Standard Test Method for Evaluation of Performance for FRP Composite Bonded to Concrete Substrate using Beam Test《采用梁试验评估混凝土基底连接的纤维增强塑料(FRP)复合材料性能的标准试验方.pdf
《ASTM D7958 D7958M-2017 0000 Standard Test Method for Evaluation of Performance for FRP Composite Bonded to Concrete Substrate using Beam Test《采用梁试验评估混凝土基底连接的纤维增强塑料(FRP)复合材料性能的标准试验方.pdf》由会员分享,可在线阅读,更多相关《ASTM D7958 D7958M-2017 0000 Standard Test Method for Evaluation of Performance for FRP Composite Bonded to Concrete Substrate using Beam Test《采用梁试验评估混凝土基底连接的纤维增强塑料(FRP)复合材料性能的标准试验方.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D7958/D7958M 17Standard Test Method forEvaluation of Performance for FRP Composite Bonded toConcrete Substrate using Beam Test1This standard is issued under the fixed designation D7958/D7958M; the number immediately following the designation indicates theyear of original adoption or, in
2、 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. Scope1.1 This test method describes the apparatus and procedurefor evaluating the performanc
3、e of wet lay-up or pultrudedFiber-Reinforced Polymer (FRP) composite systems adhe-sively bonded to a flat concrete substrate. The test determinesthe maximum force that an FRP system can bear beforedetaching from a concrete beam tested in flexure. Failure willoccur along the weakest plane within the
4、system composed ofthe FRP composite, adhesive, and concrete substrate.1.2 This test method is used for assessment and comparisonof FRP systems subject to environmental conditioning. Thistest method is not intended for job approval or productqualification purposes.1.3 This test method is intended for
5、 use with adhesive-applied FRP systems and is appropriate for use with FRPsystems having any fiber orientation or combination of plyorientations comprising the FRP composite, although the testcondition only considers forces in the direction parallel to thebeam longitudinal axis.1.4 The values stated
6、 in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system are not exact equivalents; therefore, each systemmust be used independently of the other. Combining valuesfrom the two systems may result in nonconformance with thestandard.1.4.1 Within
7、the text, the inch-pound units are shown inbrackets.1.5 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, health and environmental practices and deter-mine the a
8、pplicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued
9、by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:C31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC33/C33M Specification for Concrete AggregatesC39/C39M Test Method for Compressive Strength of Cylin-drical
10、Concrete SpecimensC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC78 Test Method for Flexural Strength of Concrete (UsingSimple Beam with Third-Point Loading)C125 Terminology Relating to Concrete and Concrete Ag-gregatesC150/C150M Specification for Portland Ce
11、mentC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC511 Specification for Mixing Rooms, Moist Cabinets,Moist Rooms, and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC617 Practice for Capping Cylindrical Concrete SpecimensD883 Terminology
12、 Relating to PlasticsD3039 Test Method for Tensile Properties of Polymer Ma-trix Composite MaterialsD3878 Terminology for Composite MaterialsD7565 Test Method for Determining Tensile Properties ofFiber Reinforced Polymer Matrix Composites Used forStrengthening of Civil StructuresE4 Practices for For
13、ce Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE122 Practice for Calculating Sample Size to Estimate, WithSpecified Precision, the Average for a Characteristic of aLot or Process1This test method is under the jurisdiction of ASTM Committee D30 onComposite
14、Materials and is the direct responsibility of Subcommittee D30.10 onComposites for Civil Structures.Current edition approved Aug. 1, 2017. Published September 2017. DOI:10.1520/D7958_D7958M-17.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United
15、StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to
16、 Trade (TBT) Committee.1E251 Test Methods for Performance Characteristics of Me-tallic Bonded Resistance Strain GagesE456 Terminology Relating to Quality and Statistics3. Terminology3.1 Terminology D3878 defines terms relating to high-modulus fibers and their composites. Terminology D883 de-fines te
17、rms relating to plastics. Terminology E6 defines termsrelating to mechanical testing. Terminology C125 defines termsrelating to concrete. Terminology E456 and Practice E122define terms relating to statistics. In the event of a conflictbetween terms, Terminology D3878 shall have precedenceover the ot
18、her standards.3.2 Definitions:3.2.1 detach, vThe FRP system pulling off of or breakingaway from the concrete substrate. Detachment may result fromcohesive failure in the FRP laminate, adhesive or substrateconcrete or from adhesive failure between any components ofthe FRP system. Detachment correspon
19、ds to the peak forcecarried by the FRP.3.3 Symbols:3.3.1 Alower bound rate coefficient: A = 0.50 MPa/min72 psi/min3.3.2 Bupper bound rate coefficient: A = 0.69 MPa/min100 psi/min3.3.3 Cresultant force of compression block3.3.4 bwidth of test beam3.3.5 CVsample coefficient of variation3.3.6 doverall
20、depth of test beam3.3.7 Ecmodulus of elasticity of concrete3.3.8 Echordtensile chord modulus of elasticity of FRP(D3039)3.3.9 fccompressive strength of concrete (C39/C39M)3.3.10 Fmaximum force in FRP3.3.11 hthickness of FRP (D3039)3.3.12 K*FRP tensile stiffness per unit width (D7565)3.3.13 nnumber o
21、f specimens3.3.14 Pmaximum applied force indicated by testing ma-chine3.3.15 rrepeatability limit, the value below which theabsolute difference between two individual test results obtainedunder repeatability conditions may be expected to occur with aprobability of approximately 0.95 (95 %)3.3.16 rPr
22、ate of application of load P, N/min lbf/min3.3.17 Sn-1sample standard deviation3.3.18 Sbonded length of FRP3.3.19 wbonded width of FRP3.3.20 xsample mean3.3.21 ximeasured or derived property3.3.22 ratio of neutral axis depth measured from com-pression face of specimen to overall depth of specimen3.3
23、.23 ratio of axial stiffness of FRP to that of concretespecimen3.3.24 strain at debonding recorded from strain gage4. Summary of Test Method4.1 This test is conducted by loading simply supportedconcrete beam specimens having a load located at the center ofthe beam span to failure. The beams are rein
24、forced on theirsoffit (tension face) with bonded FRP reinforcement. Thespecimen configuration and testing procedures are similar tothose used to determine modulus of rupture of concrete (seeTest Method C78).5. Significance and Use5.1 This test method serves as a means for uniformlypreparing and test
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