Unclassified 



SECURITY CLASSIFICATION OF THIS PAGE (When Dale Entered) 



REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 2. GOVT ACCESSION NO. 



TR-869 DN04405 3 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (^rdSub„,UJ 



LONG-TERM, DEEP-OCEAN TEST OF CONCRETE 

 SPHERICAL STRUCTURES - Results After 6 Years 



S TYPE OF REPORT S PERIOD COVERED 



Not final; Jul 1971 - Mar 1978 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORfs, 



Harvey H. Haynes and Roy S. Highberg 



8. CONTRACT OR GRANT NUMBERfsJ 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



Civil Engineering Laboratory 



Naval Construction Battalion Center 



Port Hueneme, California 93043 



10. PROGRAM ELEMENT PROJECT, TASK 

 AREA a WORK UNIT NUMBERS 



63713N, S0397,S0397-SL, 

 3.1610-1 



■' CONTROLLING OFFICE NAME AND ADDRESS 



Naval Facilities Engineering Command 

 Alexandria, Virginia 22 332 



12- REPORT DATE 



January 1979 



13. NUMBER OF PAGES 



51 



M MONITORING AGENCY NAME a AOORESSr.( d./ferenr /rom Conff.il/ine Olfice) 



15, SECURITY CLASS, (of this reporl) 



Unclassified 



15fl. DECLASSIFICATION 'DOWNGRADING 

 SCHEDULE 



16 DISTRIBUTION ST ATEMEUT (of Ihi s Report) 



Approved for public release; distribution unlimited. 



17. DISTRIBUTION STATEMENT (of the abstract entered in Block 20, if different from Report) 





19 KEY WORDS (Continue on reverse side it necessary and identify by btocl< number) 



Concrete structures, pressure-resistant structures, concrete spheres, permeability, 

 implosion, submerged concrete structures, undersea structures, long-term loading, 

 unreinforced concrete. 



20 ABSTRACT (Continue on reverse side if necessary and identify by block number) 



In 1971, a long-term, deep-ocean test was started on eighteen concrete spheres, 66 

 inches (1,676 mm) in outside diameter by 4.12 inches (105 mm) in wall thickness. The 

 spheres were placed in the ocean at depths from 1,840 to 5,075 feet (560 to 1,547 m). 

 Over a 6.4-year period, yearly inspections of the spheres by submersibles have provided data 

 on time-dependent failure and permeability. After 5.3 years, three of the spheres were 



continued 



DD ,j$ 



1473 



' 65 IS OBSOLETE 



Unclassified 



' CLASSIFICATION OF 



