Nondestructive Testing to Identify Concrete Bridge Deck Deterioration (2012) / Chapter Skim
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7C h a p t e r 2 Reinforced concrete structures such as bridge decks and pillars, highways, and other infrastructure facilities experience loss of integrity over time because of poor initial quality, damage from deicing salts, overloading, freeze–thaw cycleinduced stresses, fatigue, and, above all, corrosion of rebars (Figure 2.1)
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8engineers can often visually distinguish the two corrosion types. The locally confined, chloride-induced pitting corrosion leaves blackish rust marks, whereas red or brownish rust stains indicate carbonation-based corrosion.
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9Figure 2.3. Corroded rebar in an excavated deck (top)
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10 cycles. The progression of rebar corrosion can further exaggerate these cracks.
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11 liquid may eventually react with calcium- and aluminumcontaining phases of the cement paste to form the hydrated calcium sulfoaluminate mineral, ettringite. The formation of ettringite causes the concrete to expand, and empty cracks (gaps)
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