# Evaluation of Condition of Concrete Structures Using Ultrasonic Pulse Velocity Method
## 3 Ultrasonic Pulse Velocity Method
** \\ \hline \multirow{8}{*}{48} & 2357 & 2250 & 1706 & 2272 & 2302 & 2357 & 2250 & 1677 & 2272 & 2357 & \multirow{8}{*}{2.99} & \multirow{8}{*}{2.99} \\  & 2357 & 2302 & 1706 & 2222 & 2302 & 2357 & 2250 & 1706 & 2272 & 2357 & \multirow{8}{*}{2.99} \\  & 2302 & 2250 & 1706 & 2272 & 2302 & 2357 & 2302 & 1677 & 2222 & 2357 & \multirow{8}{*}{2.77} \\  & 2357 & 2302 & 1706 & 2222 & 2302 & 2302 & 2250 & 1706 & 2222 & 2357 & \multirow{8}{*}{2176.86} \\  & 2302 & 2302 & 1706 & 2222 & 2302 & 2357 & 2302 & 1677 & 2272 & 2357 & \multirow{8}{*}{2.77} \\  & 2357 & 2250 & 1706 & 2272 & 2302 & 2357 & 2250 & 1677 & 2325 & 2357 & \multirow{8}{*}{2.77} \\  & 2302 & 2302 & 1706 & 2272 & 2357 & 2302 & 2302 & 1706 & 2272 & 2357 & \multirow{8}{*}{2.77} \\  & 2302 & 2250 & 1706 & 2222 & 2357 & 2357 & 2250 & 1677 & 2272 & 2357 & \multirow{8}{*}{2.77} \\  & 2302 & 2250 & 1706 & 2272 & 2302 & 2302 & 2250 & 1546 & 2272 & 2357 & \multirow{8}{*}{2.77} \\  & 2357 & 2302 & 1706 & 2272 & 2357 & 2302 & 2302 & 1571 & 2272 & 2302 & \multirow{8}{*}{2.77} \\ \hline \multirow{8}{*}{72} & 2662 & 2572 & 2838 & 2750 & 2736 & 2592 & 2572 & 2757 & 2750 & 2736 & \multirow{8}{*}{5.86} \\  & 2662 & 2572 & 2757 & 2675 & 2662 & 2662 & 2648 & 2838 & 2750 & 2736 & \multirow{8}{*}{5.98} \\  & 2662 & 2572 & 2838 & 2750 & 2736 & 2662 & 2648 & 2757 & 2750 & 2736 & \multirow{8}{*}{6.36} \\  & 2662 & 2572 & 2757 & 2828 & 2662 & 2662 & 2572 & 2757 & 2750 & 2736 & \multirow{8}{*}{2703.51} \\  & 2662 & 2648 & 2838 & 2750 & 2736 & 2662 & 2648 & 2838 & 2750 & 2714 & \multirow{8}{*}{2703.51} \\  & 2592 & 2648 & 2757 & 2750 & 2736 & 2662 & 2648 & 2757 & 2750 & 2736 & \multirow{8}{*}{2703.51} \\  & 2662 & 2572 & 2757 & 2828 & 2736 & 2592 & 2648 & 2757 & 2750 & 2736 & \multirow{8}{*}{2703.51} \\  & 2662 & 2572 & 2838 & 2675 & 2736 & 2662 & 2648 & 2838 & 2675 & \multirow{8}{*}{2705} \\  & 2662 & 2648 & 2838 & 2750 & 2736 & 2662 & 2572 & 2757 & 2750 & 2736 & \multirow{8}{*}{2703.51} \\  & 2736 & 2648 & 2757 & 2750 & 2662 & 2662 & 2572 & 2757 & 2750 & 2736 & \multirow{8}{*}{2703.51} \\ \hline \multirow{8}{*}{72} & 3062 & 2969 & 3078 & 3031 & 2954 & 3062 & 3062 & 3177 & 2939 & 2954 & \multirow{8}{*}{11.98} \\  & 3163 & 2969 & 3177 & 2939 & 2867 & 3062 & 3062 & 3078 & 293.9 2954 & \multirow{8}{*}{12.85} \\  & 3161 & 2969 & 3078 & 3031 & 2867 & 3062 & 2969 & 3078 & 3031 & 2954 & \multirow{8}{*}{12.85} \\  & 3161 & 2969 & 3177 & 2939 & 2954 & 3062 & 3062 & 3078 & 3031 & 3046 & \multirow{8}{*}{2988.83} \\  & 3062 & 2969 & 3177 & 3031 & 2954 & 3062 & 3062 & 3177 & 3031 & 3046 & \multirow{8}{*}{14.22} \\  & 3062 & 3062 & 3078 & 3031 & 2954 & 3161 & 2969 & 3177 & 3031 & 2954 & \multirow{8}{*}{13.60} \\  & 3161 & 3062 & 3177 & 3031 & 3046 & 3062 & 3062 & 3177 & 3031 & 2954 & \multirow{8}{*}{13.35} \\  & 3062 & 3062 & 3078 & 3031 & 3046 & 3062 & 3062 & 3177 & 3031 & 2954 & \multirow{8}{*}{14.35} \\  & 3062 & 3062 & 3177 & 2939 & 2954 & 3062 & 3062 & 3177 & 3031 & 2954 & \multirow{8}{*}{19.09} \\  & 3062 & 3078 & 3145 & 3078 & 3046 & 3062 & 3062 & 3177 & 3031 & 2954 & \multirow{8}{*}{17.84} \\  & 3062 & 3078 & 3145 & 3078 & 3046 & 3062 & 3078 & 3250 & 3177 & 3046 & \multirow{8}{*}{17.79} \\  & 3062 & 3177 & 3145 & 3078 & 3046 & 3062 & 3177 & 3250 & 3177 & 3046 & \multirow{8}{*}{18.72} \\  & 3161 & 3177 & 3145 & 3177 & 3046 & 3161 & 3177 & 3145 & 3283 & 3145 & \multirow{8}{*}{18.97} \\  & 3161 & 3177 & 3145 & 3177 & 3046 & 3161 & 3177 & 3250 & 3177 & 3046 & \multirow{8}{*}{18.97} \\  & 3161 & 3177 & 3145 & 3177 & 3145 & 3062 & 3177 & 3250 & 3177 & 3145 & \multirow{8}{*}{18.97} \\  & 316 Figure 5 shows the concrete compressive strength according to age. As shown in the Figure 5, the concrete compressive strength was 2.58% of the designed strength at 16 h of age, 3.3% at 20 h, 3.83% at 24 h, 11.54% at 48 h, 25.25% at 72 h, 55.00% at 120 h, 74.13% at 168 h, 85.79% at 360 h, and 92.38% at 672 h. In particular, it was found that the compressive strength increased as the age increased. Figure. 6 shows the correlation between the ultrasonic pulse velocity and the compressive strength.