Flexural strength. The bending strength values after a 28-
day moist curing period are shown in Fig. 6. For specimens with
the same w/c ratio, the bending strength increased with the filling
paste ratio. The concrete with a 0.40 w/c ratio and a 70% pore-filling
paste ratio had the highest value, at 3.11 MPa. The value of the
bending strength of concrete was approximately 1/4 of the value of
the compressive strength.