ASTM C293-2007 Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)《混凝土抗弯强度的标准试验方法(用中心点荷载简支梁法)》.pdf
《ASTM C293-2007 Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)《混凝土抗弯强度的标准试验方法(用中心点荷载简支梁法)》.pdf》由会员分享,可在线阅读,更多相关《ASTM C293-2007 Standard Test Method for Flexural Strength of Concrete (Using Simple Beam With Center-Point Loading)《混凝土抗弯强度的标准试验方法(用中心点荷载简支梁法)》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C 293 07Standard Test Method forFlexural Strength of Concrete (Using Simple Beam WithCenter-Point Loading)1This standard is issued under the fixed designation C 293; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This test method covers det
3、ermination of the flexuralstrength of concrete specimens by the use of a simple beamwith center-point loading. It is not an alternative to TestMethod C78.1.2 The values stated in inch-pound units are to be regardedas standard. The SI equivalent of inch-pound units has beenrounded where necessary for
4、 practical application.1.3 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 regulatory limitations prior
5、 to use.2. Referenced Documents2.1 ASTM Standards:2C 31/C 31M Practice for Making and Curing Concrete TestSpecimens in the FieldC78 Test Method for Flexural Strength of Concrete (UsingSimple Beam with Third-Point Loading)C 192/C 192M Practice for Making and Curing ConcreteTest Specimens in the Labor
6、atoryC 617 Practice for Capping Cylindrical Concrete Speci-mensC 1077 Practice for Laboratories Testing Concrete and Con-crete Aggregates for Use in Construction and Criteria forLaboratory EvaluationE4 Practices for Force Verification of Testing Machines3. Significance and Use3.1 This test method is
7、 used to determine the modulus ofrupture of specimens prepared and cured in accordance withPractices C 31 or C 192. The strength determined will varywhere there are differences in specimen size, preparation,moisture condition, or curing.3.2 The results of this test method may be used to determinecom
8、pliance with specifications or as a basis for proportioning,mixing and placement operations. This test method producesvalues of flexural strength significantly higher than TestMethod C78(Note 1).NOTE 1The testing laboratory performing this test method may beevaluated in accordance with Practice C 10
9、77.4. Apparatus4.1 The testing machine shall conform to the requirementsof the sections on Basis of Verification, Corrections, and TimeInterval Between Verifications of Practices E4. Hand operatedtesting machines having pumps that do not provide a continu-ous loading to failure in one stroke are not
10、 permitted. Motor-ized pumps or hand operated positive displacement pumpshaving sufficient volume in one continuous stroke to completea test without requiring replenishment are permitted and shallbe capable of applying loads at a uniform rate without shock orinterruption.4.2 Loading ApparatusThe mec
11、hanism by which forcesare applied to the specimen shall employ a load-applying blockand two specimen support blocks. It shall ensure that all forcesare applied perpendicular to the face of the specimen withouteccentricity. A diagram of an apparatus that accomplishes thispurpose is shown in Fig. 1.4.
12、2.1 All apparatus for making center-point loading flexuretests shall be similar to Fig. 1 and maintain the span length andcentral position of the load-applying block with respect to thesupport blocks constant within 60.05 in. (61.3 mm).4.2.2 Reactions shall be parallel to the direction of theapplied
13、 load at all times during the test, and the ratio of thehorizontal distance between the point of load application andnearest reaction to the depth of the beam shall be 1.5 6 2%.4.2.3 The load-applying and support blocks shall not bemore than 212 in. (64 mm) high, measured from the center orthe axis
14、of pivot, and shall extend at least across the full widthof the specimen. Each hardened bearing surface in contact withthe specimen shall not depart from a plane by more than 0.002in. (0.05 mm) and shall be a portion of a cylinder, the axis of1This test method is under the jurisdiction of ASTM Commi
15、ttee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.61 on Testing for Strength.Current edition approved July 15, 2007. Published August 2007. Originallyapproved in 1952. Last previous edition approved in 2002 as C 293 02.2For referenced ASTM standards, vis
16、it 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 ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,
17、 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.which is coincidental with either the axis of the rod or centerof the ball, whichever the block is pivoted upon. The anglesubtended by the curved surface of each block shall be at least45 (0.79 rad). The load-applyi
18、ng and support blocks shall bemaintained in a vertical position and in contact with the rod orball by means of spring-loaded screws that hold them incontact with the pivot rod or ball. The rod in the centerload-applying block in Fig. 1 may be omitted when a spheri-cally seated bearing block is used.
19、5. Test Specimen5.1 The test specimen shall conform to all requirements ofPractice C 31 or C 192 applicable to beam specimens and shallhave a test span within 2 % of being three times its depth astested. The sides of the specimen shall be at right angles withthe top and bottom. All surfaces shall be
20、 smooth and free ofscars, indentations, holes, or inscribed identification marks.6. Procedure6.1 Flexural tests of moist-cured specimens shall be made assoon as practical after removal from moist storage. Surfacedrying of the specimen results in a reduction in the measuredmodulus of rupture.6.2 Turn
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