Which consequence results when mortar experiences freeze-thaw cycles in ancient ashlar masonry?

💡 Explanation

When water permeates inadequately formulated mortar in ashlar block construction and subsequently freezes, crystals form. This crystallization induces localized cracking, representing the mechanism of frost wedging, because the mortar volume expands. Therefore, cracking occurs rather than compressive strength increase, which demands stable conditions; insulation involves air gaps.

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