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← HistoryWhich outcome arises from repeated freeze-thaw cycles where Roman roads used pozzolanic concrete?
A)Reduced binder hydration rate indoors
B)Increased aggregate thermal expansion stress
C)Accelerated concrete hydraulic fracturing✓
D)Decreased pozzolan volcanic ash content
💡 Explanation
Concrete hydraulic fracturing is accelerated from volumetric expansion of ice crystals during phase transition because water permeates microcracks, therefore stress exceeds tensile strength causing crack propagation, rather than aggregate expansion affecting intact concrete. Pozzolan's effect indoors or ash content aren't relevant.
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