<< Click to Display Table of Contents >> Navigation:  Chapter 9 Geotechnical Data Management > Geotechnical Tests > Entering Test Data > Concrete Tests > Concrete Flexural Strength

The flexural strength of concrete is a measure of a concrete beam or slab to resist failure in bending. This test method determines the flexural strength using a concrete beam with third-point loading. The flexural strength is expressed as the Modulus of Rupture in psi or MPa. It is typically 10 to 20 percent of the compressive strength. The flexural strength measured will vary depending on the specimen size, preparation, moisture condition, curing, and whether the beam was molded or sawed. Test specimens should have a span within 2% of three times the depth. The test method consists of applying a force perpendicular to the face of the specimen at a constant rate until failure occurs.  

 

Data entry and calculations for this test are performed on the Concrete Flexural Strength form described in the next section. After the data and calculations have been performed the results are displayed in a test report as described in the reporting section below. The format of this report is controlled by the geotechnical template used for the test.

 

The methodology and calculations for this test adhere to "ASTM C78-02 Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)". For more detailed information on the methodology and calculations please review this standard.