Table 6. 



Comparison of Direct Transmission 

 Sound Velocity Data 



Concrete 



Test 



Block 



Average Sound Velocity (ft/sec) 



D T Wet x 100 

 Dry 



Dry 



Wet 



Mean 



Std. Dev. 



Mean 



Std. Dev. 



No. 1 

 No. 2 

 No. 3 

 No. 4 

 No. 5 



12,900 

 12,720 

 12,510 

 10,810 

 10,980 



160 

 220 

 260 

 210 

 85 



12,820 

 12,600 

 12,690 

 10,760 

 10,850 



140 

 470 

 200 

 270 

 120 



0.6% 

 0.9% 

 -1.4% 

 0.5% 

 1.2% 



Table 7. R-Meter Measurements on Selected Piles 

 from Pier J/K, Naval Air Station, 

 North Island, San Diego, CA 



Pile 



Location/ 



Rebar 



Measured Concrete 



Depth (ft) 



Size 



Cover (inches) 



9 3D 



Top/ 1.3 



No. 7 



4.6 



9 3D 



Bot/16.8 



No. 6 



1.9 



93E 



Top/ 1.5 



No. 7 



4.4 



93E 



Bot/15.7 



No. 6 



2.0 



93F 



Top/0.8 



No. 7 



4.7 



93F 



Bot/16.1 



No. 6 



2.0 



93G 



Top/ 1.0 



No. 7 



4.8 



93G 



Bot/17.5 



No. 6 



1.7 



93H 



Top/ 1.0 



No. 7 



4.7 



93H 



Bot/15.0 



No. 6 



1.9 



27 



