Figure 25. Permeability of uncoated spheres expressed as secant K„ versus time. 



the chemical composition of the cement 

 pastes; his report is given in Appendix E. 

 All samples showed that the cement 

 compounds were hydrated. The samples 

 also showed that substantial amounts of 

 calcium hydroxide were present, which 

 indicates the hardened cement pastes 

 were undamaged. No evidence was 

 present of harmful chemical compounds. 

 The ocean concrete remained essentially 

 unaltered from the fog-cured concrete. 



FINDINGS 



1. Concrete that was placed in the ocean 

 decreased in compressive strength by at 

 least 10% due to saturation. A time 

 period of from 1 to 2 years in the ocean 

 was required to regain a strength equal 

 to that of the 28-day fog-cured strength. 



2. After 5.3 years in the ocean, concrete 

 showed a compressive strength that was 

 15% greater than its 28-day fog-cured 



33 



