Discussion
Consider the following statements about single layer armour systems.
1. They achieve stability at lower total concrete volume.
2. They demand accurate placement to develop the interlock.
3. They fail gradually in the same manner as rock armour.
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: a single layer of interlocking units achieves stability with substantially less concrete than two layers of cubes, and the interlock only develops if the units are placed to the pattern and density specified. Statement 3 is wrong and is the system’s principal risk - single layer armour fails progressively rather than gradually, so it is designed for essentially no damage.
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