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← ScienceWhich outcome occurs when rapid heating causes water's phase transition inside concrete?
A)Increased internal pressure causes spalling✓
B)Decreased chloride diffusion lessens reinforcement corrosion
C)Slower carbonation enhances concrete matrix integrity
D)Reduced alkalinity prevents aggregate dissolution
💡 Explanation
Spalling occurs because rapid heating initiates the phase transition of water to steam. The resulting volumetric expansion increases internal pressure due to the increased kinetic energy and vapor generation, therefore spalling occurs rather than the other options related to concrete chemistry.
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