Building Construction Technology quizzes
How building materials work, from concrete’s hardening reactions to the strength and durability of the structures around us.
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From Building Construction Technology: Why Concrete Never Really Dries
Roman harbor concrete has survived two thousand years in seawater. What helps explain its durability?
- The Romans coated it with thick layers of lead
- Its stone was cut from the ocean floor itself
- Volcanic ash reacts with seawater, growing new minerals
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Answer: Volcanic ash reacts with seawater, growing new minerals
Studies found seawater seeping through the volcanic-ash mix slowly grows interlocking crystals that strengthen it, while modern concrete tends to erode.
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