Table B-1. Early Compressive Strength Data of Spheres 



[Each compressive strength value is average of three 6 x 12-in. (152 x 305-mm) cast cylinders.] 



Sphere 

 No. 



Hemisphere 

 No. 



28-Day Fog Cure 



Prior to Ocean Emplacement 



Compressive 

 Strength, f^ 



(psi) 



Coefficient 

 of 



Variation 



(%) 



Compressive 



Strength, 



f^, of Wet 



Concrete 



(psi) 



Coefficient 



of 

 Variation 



(%) 



Compressive 



Strength 



f^, of Dry 



Concrete 



(psi) 



Coefficient 



of 

 Variation 



(%) 



Age 



(days) 



1 



W4 



8,520 



0.1 







8,940 



1.5 



174 





W35 



8,070 



2.1 







9,360 



1.5 



65 



2 



W8 



8,250 



2.9 







9,950 



3.3 



164 





W7 



7,940 



0.6 







8,970 



4.5 



162 



3 



W15 



8,520 



1.5 







8,840 



1.5 



134 





W16 



8,400 



1.9 







9,650 



2.0 



132 



4 



W6 



8,760 



0.7 



8,320 



5.8 







170 





W5 



8,050 



1.5 



7,600 



2.7 







172 



5 



WIO 



7,730 



1.1 



8,090 



2.9 







156 





W9 



8,240 



1.7 



7,690 



1.7 







158 



6 



W14 



8,580 



1.8 



8,510 



1.6 







143 





W13 



8,060 



1.5 



8,370 



2.6 







144 



7 



W20 



7,660 



1.7 







9,530 



2.3 



117 





W17 



7,550 



5.5 







9,480 



2.3 



126 



8 



W22 



7,520 



2.2 







9,030 



1.2 



111 





W19 



8,410 



3.2 







9,380 



5.7 



119 



9 



W28 



6,920 



1.8 



7,820 



5.5 







94 





W25 



8,070 



3.4 



8,740 



2.7 







104 



10 



W30 



8,190 



1.2 



8,560 



4.4 







88 





W27 



7,900 



0.2 



8,330 



9.6 







97 



11 



W24 



7,540 



3.8 







9,820 



5.6 



103 





W21 



7,720 



2.7 







9,190 



3.3 



113 



12 



W32 



7,570 



0.6 



8,390 



6.7 







80 





W29 



7,240 



3.0 



7,430 



0.6 







89 



13 



W26 



8,070 



4.5 







10,210 



5.3 



98 





W23 



7,640 



2.0 







9,370 



1.2 



105 



14 



W12 



6,990 



2.1 







8,170 



1.3 



144 





WU 



7,550 



3.0 







9,200 



2.0 



148 



15 



W34 



8,170 



2.3 



7,830 



4.9 







74 





W31 



7,810 



1.4 



8,740 



1.9 







82 



16 



W36 



7,220 



2.0 



7,780 



1.7 







67 





W33 



7,930 



0.4 



8,340 



0.3 







75 



17 



W39 



8,050 



1.1 







9,050 



4.2 



51 





W40 



7,730 



2.0 



7,730 



5.0 







52 



18 



W41 



8,620 



2.3 







8,770 



5.2 



48 





W42 



7,970 



2.1 



7,590 



4.3 







45 



^0 



