Cables for lowering and raisios loads in deep water, for aooring 

 buoys «uui ships .» for guying structurfeSj, and cables for general -purpose 

 work are inportant to the deep-ocean prograja and will be tested » 

 Inclxided in this prograa will be galvanized steel, electrogalvanized 

 steel, altaainized steel, uncoated steel, and polyvinyl -chloride-coated 

 steel cables. Stainless steels and other alloys will be included. 

 Specimens of some electricaJ. cables will also be included. 



The suitability of concrete for use in deep-ocegm stnictures will 

 be investigated. Experiments will be set trp to evaluate the effect of 

 this environment on its permeability, water absorption, volume change, 

 auid durability. The types of reinforcing material for this use will 

 euLso be investigated. 



KXPERBENTAL EMVIRONMEHTS 



If the restilts of experiments conducted in deep-ocean environments 

 differ materially from what would be expected of similar materials 

 closed in shaU-ow-water environments (judged on the basis of data 

 published in the literature), it will then be necessary to conduct 

 similar experiments using identical specimens in shallow water to 

 Insure that the anomalous restilts were in fact due to the environmental 

 differences and not due to some variable in the particular specimens 

 used or to the experimental technique. In the event that such shallow- 

 water expoBxire seoss desirable. Port Huenane Harbor will probably be 

 used. Various pressurized and unpressiirized laboratory-simulated deep- 

 ocean environments will also be used to isolate and study the contribution 

 of individual factors to the deterioration of materials exposed in the 

 deep ocean. 



Deep-Water Environments 



The environments with which this task is primarily concerned are 

 those of the water near the ocean bottom (at depths beyond normal _ 

 engineering construction practicesj i.e., depths in excess of 2000 ft), 

 the water-bottom interface, the sediments adjacent to the water-bottcm 

 interface, and to a sonewhat lesser extent, the intervening water mass 

 between the ocean bottom and the surface ^ 



This study concentrates on these environments because the effects 

 of the near-surface (shallow -water) environment on materials have been 

 and are under intensive study by many other agencies. Also it is 

 believed that the greater part of most deep-ocean structures of interest 

 to BuDocks win be on the oceaua bottom or in its immediate vicinity. 



