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ASTM C78/C78M-18 pdf free download.Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading.
1 .1 This test method covers the determination of the Ilexural 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 he 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 1101 purport to address till of the safety concerns, if any, associated wit/i its use. It is the responsththtv of the user of this standard to establish appropriate safety, health, and environmental practices and deter mine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards.
C31/C3IM Practice for Making and Curing Concrete Test Specimens in the Field
C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
C125 Terminology Relating to Concrete and Concrete Aggregates
3. Terminology
3. 1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology C125 and Terminology E6.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 flexural strength—maximum resistance of a specimen subjected to bending.
3.2. 1.1 Discussion—in this test method, flexural strength is reported as the modulus of rupture.
3.2.2 flexural testing apparatus—fixture used to apply force to the beam specimen and consists of loading and support blocks.
3.2.3 loading block—component of the testing apparatus in the shape of a portion of a cylinder that is used to apply a force to the beam specimen.
3.2.4 modulus of rupture—calculated stress. assu ml ng linear-elastic behavior, in the tensile face of a beam specimen at the maximum bending moment during a standard test method.
3.2.5 span length—distance between lines of support, or reaction, for the beam specimen. and it is equal to three times the nominal depth of the beam.
3.2.5. 1 Discussion—For example, for a 100 mm [4 in.] nominal depth beam, the span length is 300 mm [12 in.] and for a 150 mm [6 in.] nominal depth beam, the span length is 450 mm [18 in.]. See 3.2.6. 1, for discussion of reaction block.
ASTM C78/C78M pdf download.