CORE-LOC concrete armor units

Abstract : A new series of coastal rubble structure concrete armor units called CORE-LOC has been developed at the Coastal Engineering Research Center, U.S. Army Engineer Waterways Experiment Station. CORE-LOC units have been designed for random placement in a single layer on steep or shallow slopes. CORE-LOC shapes have been optimized to maximize hydraulic stability, unreinforced strength, and reserve stability, but minimize on slope volume and casting yard space. CORE-LOC is designed to interlock well with dolosse so that it can be used as a repair unit. While several different CORE-LOC shapes have been developed, this report discusses preliminary hydraulic stability tests of the middle aspect ratio. Finite element studies of CORE-LOC showed maximum flexural tensile stresses to be 47 percent, 74 percent, and 33 percent those of dolosse, accropode, and tribar, respectively. Torsional stresses were 54 percent, 74 percent, and 38 percent those of dolosse, accropode, and tribar, respectively. Initial two-dimensional hydraulic stability tests of the CORE-LOC shape indicate that the unit is one of the most stable randomly placed armor units ever tested, withstanding breaking wave heights 5 to 7 times the maximum dimension of the unit on slopes of 3V:4H and 1V:1.5H.

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