Which risk increases when Roman concrete fortifications were built with high amounts of seawater during construction?

💡 Explanation

When Roman concrete used seawater, chloride-induced corrosion occurs because the chloride ions penetrate the cement matrix and attack the reinforcing volcanic ash, resulting in expansion and cracking. Therefore reduced tensile strength over time results, rather than increased weathering resistance, better adhesion, or decreased permeability because these rely on a stable, non-corroding matrix.

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