Concrete Blocks
Concrete blocks for semi-rigid armor layers are designed with various intermeshing or
interlocking features, and many of the units are patented (Figure 46). Blocks have the advantage of neat,
uniform appearance. Many units are light enough to be i stalled by hand once the slope has been
prepared. The disadvantage of concrete blocks is that the interlocking feature between units must be
maintained. Once one block is lost, other units so dislodge, and complete failure may result. A stable
foundation required since settlement of the toe or subgrade can cause displacement of the units and
ultimate failure. Also, some concrete block revetments have smooth faces that can lead to significantly
higher wave runup and overtopping.
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