Concrete
Wave Height Range: Below five feet.
Runup Characteristic: Rough or stepped.
A concrete rubble revetment utilizes a waste product otherwise difficult to dispose of in an
environmentally acceptable manner. The concrete should have the strength to resist abrasion by
waterborne 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, usually because of
neglect of filter requirements. Figure B-4 shows two cross sections that would probably be more
successful than random dumping on a slope. The upper section uses up to three layers of concrete rubble
shaped so that the longest dimension is no greater than three times the shortest. This increases stability
by minimizing uplift on the slabs from wave forces. The revetment shown in Figure B-2 was similar,
except that only one layer of rubble was used. This revetment subsequently suffered damages, but more
than one layer might have improved its performance. The lower section in Figure B-4 utilizes shaped
rubble, stacked on the slope to create a stepped face.
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