Table 4.
Ultrasonic wave velocity (cp) calculated on the basis of transit times recorded (acc. to procedure described in EN 12504-4:2021 standard [43]) 14 days and 3 years after concrete preparation.
| Concrete Symbol | Ultrasonic Wave Velocity, cp | ||||||
|---|---|---|---|---|---|---|---|
| After 28 Days | After 3 Years | Change | |||||
| Mean [m/s] | SD [m/s] |
CV [%] |
Mean [m/s] | SD [m/s] |
CV [%] |
Δcp [%] |
|
| OC | 5070 | 82 | 1.6 | 5020 | 101 | 2.0 | −1.0 |
| SAP-25 | 5047 | 38 | 0.8 | 5152 | 211 | 4.1 | 2.1 |
| SAP-50 | 4947 | 42 | 0.8 | 4958 | 107 | 2.2 | 0.2 |
| SAP-50s | 5043 | 55 | 1.1 | 5475 | 100 | 1.8 | 8.6 |
| SAP-75 | 4727 | 111 | 2.3 | 4940 | 70 | 1.4 | 4.5 |