Table 3. Schmidt Hammer Data Comparison - Dry Tests 



Concrete 

 Test 



Schmidt Hammer Data 



Comparison 



Hammer 



Hammer 



Mod. Hammer 



1 - 



2 



1 - M.H. 



2 - M.H. 



Block 



No. 1-8140 



No. 2-8155 



No. 8148 



























(Avg/S.D.) 



(Avg/S.D.) 



(Avg/S.D.) 



A 





A 



% 



A 



% 



No. 1-side 



30.5/2.4 



32.3/3.17 



32.8/4.9 



-1.8 



-6 



-2.3 



-8 



-0.5 



-2 



No. 1-top 



28.6/3.3 



29.4/3.2 



24.0/3.1 



-0.8 



-3 



4.6 



16 



5.4 



18 



No. 2-side 



32.2/2.4 



27.5/3.4 



29.5/4.8 



4.7 



15 



2.7 



8 



-2 



-7 



No. 2-top 



19.8/1.8 



18.9/3.6 



16.9/3.3 



0.9 



5 



2.9 



15 



2.0 



11 



No. 3-side 



31.5/3.0 



27.1/2.8 



24.2/1.8 



4.4 



14 



7.3 



23 



2.9 



11 



No. 3-top 



17.7/2.0 



18.9/3.5 



* 



-1.2 



-7 



— 



— 



— 



— 



No. 4-side 



20.0/2.1 



15.5/1.9 



19.4/4.0 



4.5 



23 



0.6 



3 



-3.9 



-25 



No. 4-top 



13.0/3.7 



14.9/3.0 



A 



-1.9 



-15 



— 



— 



— 



— 



No. 5-side 



16.3/1.8 



15.9/3.7 



14.2/1.1 



0.4 



2 



2.1 



13 



1.7 



11 



No. 5-top 



13.0/1.5 



12.6/2.4 



* 



0.4 



3 











No . 6-Area 1 



32.9/1.3 



32.6/1.6 



33.9/3.4 



0.3 



1 



-1 



-3 



-1.3 



-4 



No. 6-Area 2 



26.5/1.8 



28.8/3.6 



30.5/5.1 



-2.3 



-9 



-4.0 



-15 



-1.7 



-6 



No. 6-Area 3 



33.8/2.8 



33.2/3.1 



37.7/4.5 



0.6 



2 



-3.9 



-12 



-4.5 



-14 



No. 7-Floor 



43.7/2.7 



42.4/3.1 



40.6/6.6 



1.3 



3 



3.1 



7 



1.8 



4 







Number of Data Points: 



n = 



14 



n = 



11 



n = 11 







Average Difference: 



x = 



2% 



x = 



4.3% 



x = -0.3% 







Standard Deviation: 



s = 



10 



s = 



12.4 



s = 12.8 



*0utside operating range (too low) . 



25 



