What is the specified rate of load application when testing concrete cylinders for compressive strength per ASTM C39?
-
A
20 ± 5 psi/s (0.14 ± 0.03 MPa/s)
-
B
35 ± 7 psi/s (0.25 ± 0.05 MPa/s)
-
C
50 ± 10 psi/s (0.34 ± 0.07 MPa/s)
-
D
75 ± 15 psi/s (0.52 ± 0.10 MPa/s)