Research Article
Experimental Study on the Impact Resistance of Closed-Cell Aluminum Foam Protective Materials to RC Piers under Lateral Impact
Table 8
Changes in the ultrasonic velocities of the concrete piers.
| Group | Specimen no. | Impact velocity (m) | Average sound velocity (km/s) | Reduction of sound velocity (km/s) | Total reduction of sound velocity (km/s) | Change rate of sound velocity (%) | Before impact | After impact |
| A | Z1 | 0.76 | 4.179 | 4.174 | 0.005 | 0.696 | 16.65 | 1.14 | 4.161 | 4.146 | 0.015 | 2.43 | 3.658 | 3.483 | 0.175 | Z2 | 0.76 | 4.04 | 4.032 | 0.008 | 0.365 | 9.03 | 1.14 | 4.018 | 4.001 | 0.017 | 2.43 | 3.777 | 3.675 | 0.102 | Z3 | 0.76 | 4.1 | 4.084 | 0.016 | 0.853 | 20.80 | 1.14 | 4.054 | 4.012 | 0.042 | 2.43 | 3.457 | 3.247 | 0.21 |
| B | Z4 | 0.76 | 4.333 | 4.327 | 0.006 | 0.69 | 15.9 | 1.14 | 4.316 | 4.307 | 0.009 | 2.43 | 3.826 | 3.643 | 0.183 | Z5 | 0.76 | 4.102 | 4.096 | 0.006 | 0.351 | 8.57 | 1.14 | 4.087 | 4.076 | 0.011 | 2.43 | 3.851 | 3.751 | 0.1 | Z6 | 0.76 | 4.131 | 4.118 | 0.013 | 0.821 | 19.84 | 1.14 | 4.092 | 4.062 | 0.03 | 2.43 | 3.414 | 3.310 | 0.204 |
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