CPCI_Precast_Corrosion_n - PRECAST PRESTRESSED CONCRETE...

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1 PRECAST / PRESTRESSED CONCRETE CORROSION RESISTANCE
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2 CORROSION: The natural alkaline environment of fresh concrete protects the steel reinforcement from corrosion. Prolonged exposure to road salt (chlorides) breaks down this protection. Chlorides reach the reinforcement by penetrating into the concrete and through small cracks in the concrete. Once steel reinforcement starts to rust, the rust takes up more volume than the original steel. This causes expansion, cracking and progressively more corrosion (ratchet action). If left unchecked, expensive repairs will be required.
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3 CORROSION: Concrete Quality Concrete Quality High quality precast concrete with adequate air entrainment will reduce or eliminate scaling, spalling and premature wear.
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4 CORROSION: Drainage Drainage Sloping the structure to achieve good drainage is essential to quickly remove rain and salt laden water from the structure. The drainage pattern selected should repeat for all floors to allow for repetition in the construction.
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