Influence of Early Age on the Wave Velocity and Dynamic Compressive Strength of Concrete Based on Split Hopkinson Pressure Bar Tests
Table 3
Effect of impact with different age on the dynamic strength of concrete at age of 28 days.
Serial number
Impact level
Dynamic strength/MPa
Failure shape (impact at 28 days)
1-1
50% 120%
4.08
24.91
fragmentation with large degrees
1-2
50% 50%
3.85
17.4
intact
1-3
50% 75%
4.50
20.35
local crack crush
3-1
50% 50%
7.91
17.98
intact
3-2
50% 75%
8.39
23.4
intact
3-3
50% 130%
10.9
30.51
crush
3-4
75% 50%
10.19
16.14
fragmentation, exit large degrees
3-5
100% 75%
11.91
20.48
crush
7-1
50% 75%
7.73
20.2
critical failure
7-2
50% 100%
8.44
21.74
fragmentation with large degrees
7-3
75% 75%
13.69
18.19
fragmentation with large degrees
7-4
75% 100%
12.89
19.26
crush
7-5
100% 50%
16.71
23.94
crush
14-1
50% 130%
7.83
21.71
critical failure
14-2
75% 75%
15.3
15.56
intact
14-3
75% 130%
12.93
23.22
fragmentation with large degrees
14-4
75% 150%
12.34
24.1
crush
14-5
50% 130%
7.83
21.71
critical failure
Note: the first number of the serial number indicates the specimen age, and the second number indicates the specific number; the first value of impact level indicates the impact level of first impact, and the second value of impact level indicates the impact level at 28 days.
