Discussion
Slender legged concrete armour units such as tetrapods are vulnerable to
Answer: A
Correct answer: breakage of the legs under repeated wave impact
The slender legs that give a tetrapod its interlock are also its weakest feature: unreinforced concrete in tension, they crack under repeated impact and rocking, and once broken the unit loses both its interlock and its mass. The failure is not chemical - marine concrete of good quality is durable - but structural, and it is what led to the development of bulkier single layer units.
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