<p><p><strong>Reference(s):</strong></p><p><em>NAIK (2004)<br>Reindl (2003)<br>RMT NCASI (2003)<br>Schimmoller et l. (2000)<br>Solanski (2007)</em></p><p><strong>Method Summary</strong></p><p>Testing the flexural strength of concrete (ASTM C78) requires the use of a simple beam with third-point loading. The results of this test method may be used to determine compliance with specifications or as a basis for proportioning, mixing and placement operations. It is used in testing concrete for the construction of slabs and pavements. The third point loading method shall be used in making flexure tests of concrete employing bearing blocks which will ensure that forces applied to the beam will be perpendicular to the face of the specimen and applied without eccentricity. Concrete containing recycled materials shall follow same testing procedure to assess its flexural strength.</p><p><strong>Accuracy and Precision</strong></p><p>Standard tests are employed.</p><p><strong>Adequacy of Coverage</strong></p><p>Standard tests are employed.</p><p><strong>Implementation Requirements </strong></p><p>Implementation requirements are not excessive.</p><p><strong>General Comments</strong></p><p>Fifteen high-sulfur coal ash samples were obtained from eight different sources and tested for their physical, chemical, mineralogical, and microstructural properties. Based on these properties, two sources of both conventional (Class F) and clean-coal ashes were selected for further investigation. Two additional ash samples were prepared by blending these selected conventional and clean-coal ashes. Using these six different ash samples, eleven masonry mixtures were proportioned for initial testing and evaluation.</p></p>