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ASTM C78/C78M-21

Historical Revision

Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)

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1.1 This test method covers the determination of the flexural strength of concrete by the use of a simple beam with third-point loading.

1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


4.1 This test method is used to determine the flexural strength of specimens prepared and cured in accordance with Test Methods C42/C42M or Practices C31/C31M or C192/C192M. Results are calculated and reported as the modulus of rupture. For the same specimen size, the strength determined will vary if there are differences in specimen preparation, curing procedure, moisture condition at time of testing, and whether the beam was molded or sawed to size.

4.2 The measured modulus of rupture generally increases as the specimen size decreases.3,4,5

4.3 The results of this test method may be used to determine compliance with specifications or as a basis for mixture proportioning, evaluating uniformity of mixing, and checking placement operations by using sawed beams. It is used primarily in testing concrete for the construction of slabs and pavements.

4.4 For identical test specimens, the modulus of rupture obtained by this test method will, on average, be lower than that obtained by Test Method C293/C293M.

SDO ASTM: ASTM International
Document Number C78
Publication Date March 1, 2021
Language en - English
Page Count 5
Revision Level 21
Supercedes
Committee C09.61
Publish Date Document Id Type View
March 1, 2022 C0078_C0078M-22 Revision
March 1, 2021 C0078_C0078M-21 Revision
Jan. 1, 2018 C0078_C0078M-18 Revision
Dec. 1, 2016 C0078_C0078M-15B Revision
July 1, 2016 C0078_C0078M-16 Revision
May 1, 2015 C0078_C0078M-15A Revision
April 1, 2015 C0078_C0078M-15 Revision
Aug. 1, 2010 C0078_C0078M-10E01 Revision
Aug. 1, 2010 C0078_C0078M-10 Revision