Concrete
Wave Height Range: Below five feet.
A concrete rubble revetment utilizes a waste product that is otherwise difficult to dispose of in an
environmentally acceptable manner. The concrete should have the durability to resist abrasion by water-
borne debris and ice pressure. In addition, all protruding reinforcing bars should be burned off prior to
placement. Numerous concrete rubble revetments have failed in the past, but this has generally been
attributable to neglect of filter requirements. Figure 44 shows two cross sections that would probably be
more successful than random dumping on a slope. The upper section uses three layers of concrete
rubble, shaped so that the longest dimension is no greater than three times the shortest, thus increasing
stability and minimizing uplift on the slabs from wave forces. The revetment shown on Figure 45 is
similar, except only one layer of rubble was used. It subsequently suffered damages, but more than one
layer of rubble may have improved its performance. The lower section on Figure 44 utilizes shaped-
rubble stacked on a slope to create a stepped face.
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