Table 4. Modified Schmidt Hammer Data - 

 Dry vs. Wet 



Concrete 



Test 



Block 



Mod. Hammer - 8148 



Comparison 



Dry 



Wet 



Wet -Dry 



W-D/W 





Avg/S.D. 



Avg/S.D. 



A 



% 



No. 1 



32.8/4.9 



38.1/3.3 



5.3 



14 



No. 2 



29.5/4.8 



33.3/7.2 



3.8 



11 



No. 3 



24.2/1.8 



28.0/5.4 



3.8 



14 



No. 4 



19.4/4.0 



13.7/2.6 



-5.7 



-42 



No. 5 



14.2/1.1 



16.0/2.1 



1.8 



11 



No . 6-Area 1 



33.9/3.4 



36.4/4.9 



2.5 



7 



No. 6-Area 2 



30.5/5.1 



31.5/4.6 



1.0 



3 



No. 6-Area 3 



37.7/4.5 



41.0/5.5 



3.3 



8 



Table 5. 



Ultrasonic Sound Velocity 

 Ratings for Concrete 



Sound Velocity 



General 



Condition 



Rating 



ft/sec 



m/sec 



>15,000 



12,000-15,000 



10,000-12,000 



7,000-10,000 



<7,000 



4,860 



>4,575 

 3,660-4,575 

 3,050-3,660 

 2,135-3,050 



<2,135 

 1,480 



Excellent 



Good 

 Questionable 



Poor 

 Very Poor 



Water 



26 



