CONCRETE CONSTRUCTION IN THE PHILIPPINE ISLANDS. 127 

 Concrete cubes from Garcar Bridge, Gebu. 



Mark on cubes. 



Age, 



in 

 days. 



Dimen- 

 sions, in 

 inches. 



Initial 

 crack. 



Ultimate, 

 strength. 



Strength, in 



pounds, per square 



inch. 



Remarks. 



First 

 crack. 



Ultimate. 



Class "B" con- 

















crete, Spand- 







10, 600 



43, 600 



294 



1,211 



Good mixture, fair 



rel Wall, Car- 















mortar. The lar- 



car Bridge, 















ger stones were 



project R-16- 



35 



6X6X6 











mostly broken. 

 Gravel poor. 









28, 650 



54,630 



796 



1,517 



Do. 



■ 







00 



35, 300 





980 



First crack at about 



l " 















8,000. 



Do 



.37 



6 6 X 6 



21,300 



28, 580 



592 



794 



The large stones 

















were broken. 

















Sand seems to be 



i' 















the chief fault, as 

















it contains shells 

















and dirt. 



Do 



47 



6X6X6 



9, 250 



32, 800 



257 



911 



Voids in sand not 

 filled up. The 



















mortar was weak. 



Do 



37 



6X6X6 



17, 300 



28,000 



480 



778 



Large percentage 

 of the stones was 































broken, fair mor- 

















tar. 









00 



36, 000 





1,000 



First crack at about 

















6,000 pounds. 



Do 



47 



6X6X6 











Cube received 

 with 2 corners 



















broken off. 









16,000 



34, 000 



444 



944 



The mortar as well 

 as the gravel was 

 poor. 









r 17,300 



36, 800 



| 



480 



1,022 



The majority of the 



Do 



49 



6X6X6 





. 







stones were 

 broken. 









I (•') 



36, 400 





1,011 



First crack at a bout 



i 















6,000 pounds. 



, 















Cube received 

















with 2 corners 











j 







broken off. 



"Less than 8,000. 



11 Less than 6,000. 



All cubes were submerged two weeks iti water. 



