Angle (degrees)

6 MV concrete

18 MV concrete

20

1.42 × 10−03 ± 1.06 × 10−04

1.44 × 10−03 ± 2.43 × 10−05

30

6.74 × 10−04 ± 5.51 × 10−05

4.95 × 10−04 ± 1.09 × 10−05

45

2.99 × 10−04 ± 3.21 × 10−05

1.98 × 10−04 ± 6.21 × 10−06

60

2.74 × 10−04 ± 2.56 × 10−05

1.10 × 10−04 ± 4.81 × 10−06

75

1.80 × 10−05 ± 1.46 × 10−05

4.77 × 10−05 ± 3.65 × 10−06