Influence of Early Age on the Wave Velocity and Dynamic Compressive Strength of Concrete Based on Split Hopkinson Pressure Bar Tests

Table 2

Critical failure strength of different age concrete under signal impact.

Age/day	Incident energy/J	Strain rate/	Strength/MPa
1	50	29	5.88
3	58	30	12.39
7	74	42	17.95
14	80	33	26.07
28	85	35	31.65