Accession Number : AD0649290

Title :   BEHAVIOR OF SPHERICAL CONCRETE HULLS UNDER HYDROSTATIC LOADING. PART I. EXPLORATORY INVESTIGATION.

Descriptive Note : Technical rept., Apr 65-May 66,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF

Personal Author(s) : Stachiw,J. D. ; Gray,K. O.

Report Date : MAR 1967

Pagination or Media Count : 75

Abstract : Hollow concrete spheres 16 inches in outside diameter have been tested to destruction by exposure to external hydrostatic pressure in seawater to determine the compressive strength and permeability of concrete under such loading. The testing has shown that for the particular mix used, the compressive strength of dry concrete in a spherical hull of 16-inch outside diameter and 1-inch wall thickness under biaxial loading (short-term hydrostatic pressurization to failure at a constant rate) is approximately 48% higher than for identical dry concrete in 3-inch-diameter by 6-inch-long solid test cylinders under uniaxial loading conditions. Concrete spheres in which the wall was thoroughly permeated by seawater failed at stress levels approximately 18% higher than 3-inch-long solid test cylinders. The permeability of uncoated spheres to seawater at simulated ocean pressure of 1,500 psi was approximately 6 x 0.001 milliliters per hour per square inch of area per 1 inch of thickness. (Author)

Descriptors :   (*SHELLS(STRUCTURAL FORMS), *CONCRETE), (*UNDERWATER, SHELLS(STRUCTURAL FORMS)), PERMEABILITY, MIXTURES, SEA WATER, OCEAN BOTTOM, CYLINDRICAL BODIES, HYDROSTATIC PRESSURE, DEFORMATION

Subject Categories : Ceramics, Refractories and Glass
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE