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← TechnologyWhich risk escalates if concrete's pH around reinforcing steel (rebar) decreases below 9?
A)Accelerated rebar corrosion leading to spalling✓
B)Reduced concrete compressive strength under load
C)Increased thermal expansion causing cracking
D)Weakened bond between aggregate and cement
💡 Explanation
When concrete's pH drops below 9, passivation layer breakdown on the rebar occurs allowing oxidation to happen because the alkaline environment normally protects rebar, initiating corrosion ultimately leading to expansion from rust, causing concrete to spall, rather reduced strength which targets compressive qualities.
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