Which immediate structural effect occurred when Roman engineers introduced pozzolanic concrete in harbor fortifications?

💡 Explanation

When pozzolanic concrete was used, it reacted chemically with seawater through hydration because the pozzolan is a siliceous material, leading to superior strength and durability in marine environments. Therefore, increased tidal erosion resistance results, rather than reduced set time, decreased weight or coloration improvement which relied on different aggregate properties.

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