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← HistoryWhich outcome occurs when alternating freezing and thawing affects lime mortar supporting Mughal pietra dura?
A)Detachment of stonework due to cryoclasty✓
B)Uniform surface oxidation of all elements
C)Complete conversion to gypsum accelerates
D)Cracks initially heal through autogenous swelling
💡 Explanation
Cryoclasty is the mechanism because water expands upon freezing within mortar pores, thereby exerting pressure, which causes the stonework to detach rather than uniform oxidation. Therefore, physical fracturing is the consequence, rather than a chemical alteration.
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