Powder substitution (%)

Three point flexural strength (MPa)

2 days

7 days

28 days

PBV (υ)

PBB (υ)

PBV (υ)

PBB (υ)

PBV (υ)

PBB (υ)

0

1.67 (0.36)

1.04 (0.26)

2.94 (0.54)

2.47 (0.42)

3.53 (0.87)

4.97 (0.68)

10

1.84 (0.50)

1.39 (0.30)

3.36 (0.46)

2.86 (0.75)

4.05 (0.79)

5.21 (0.89)

20

1.95 (0.41)

2.64 (0.53)

3.62 (0.69)

3.36 (0.71)

4.24 (0.91)

5.30 (0.82)

35

2.02 (0.55)

2.92 (0.44)

3.84 (0.67)

3.66 (0.80)

4.53 (0.83)

5.35 (0.87)

50

2.86 (0.63)

3.63 (0.46)

3.94 (0.52)

3.91 (0.64)

4.90 (0.79)

5.72 (0.84)

65

1.85 (0.31)

2.91 (0.37)

3.57 (0.39)

3.62 (0.37)

4.17 (0.56)

4.23 (0.68)