Which structural risk grew during medieval castle wall construction when mortar mixing ratios increased lime content disproportionately versus aggregate?

💡 Explanation

Increased lime leads to higher alkalinity; this encourages sulfate attack from groundwater by forming expansive minerals within the mortar, weakening it from within through crystal growth—a chemical weathering process. This occurs because the binding reaction changes; therefore, lower porosity is not likely; rather than increased compressive strength.

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