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20. Continued 
were compared with those of controlled concrete specimens cured in a fog room and 
also in a tank containing continuously circulating seawater. 
Library Card 
Civil Engineering Laboratory 
COMPRESSIVE STRENGTH OF FRESHLY MIXED CON- 
CRETE PLACED, CURED, AND TESTED IN THE DEEP 
OCEAN, by Harvey H. Haynes and Larry D. Underbakke 
TN-1603 20 pp illus February 1981 Unclassified 
1. Concrete — compressive strength 2. Concrete — oceanemplacement I. 3.1610-1 
Freshly mixed concrete, of low- and high-strength mix designs, was placed in the 
Pacific Ocean in 6 x 12-inch (152 x 305-mm) cylindrical molds to attain initial and final set 
and cure at a depth of 1,830 feet (560 m). At age 11 months, the concrete specimens were 
retrieved and subsequently tested under uniaxial compression in a pressure vessel that simu- 
lated the ocean depth. The compressive strengths of the deep-ocean concrete specimens 
were compared with those of controlled concrete specimens cured in a fog room and also in 
a tank containing continuously circulating seawater. 
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SECURITY CLASSIFICATION OF THIS PAGESWhen Data Entered) 
