*2.2.3. Flexural strength testing*

Samples of dimensions 65 mm × 10 mm × 4 mm were prepared using paraffin wax in accordance with the ASTM F417-78 standards. Cement samples were put in these molds and used for flexural testing. The same compression machine was used at a cross-head speed of 1 mm/min. Three samples for each concentration of HNTs were used and an average was calculated.
