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← ScienceWhich outcome occurs when moisture freezes within porous concrete during rapid cooling?
A)Internal pressure buildup causing fractures✓
B)Increased concrete tensile strength overall
C)Exothermic reaction generating heat
D)Reduced chloride ion penetration resistance
💡 Explanation
When moisture freezes in porous concrete, ice crystal formation causes volumetric expansion because water expands upon freezing creating internal pressure that exceeds the tensile strength, leading to fracturing. Therefore internal pressure buildup and cracking results, rather than strength increase, heat generation, or reduced chloride resistance which require different hydration/chemical processes.
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