CPCI_Precast_Corrosion_n

CPCI_Precast_Corrosion_n - PRECAST / PRESTRESSED CONCRETE...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 PRECAST / PRESTRESSED CONCRETE CORROSION RESISTANCE
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 2
3 CORROSION: Concrete Quality Concrete Quality High quality precast concrete with adequate air entrainment will reduce or eliminate scaling, spalling and premature wear.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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. Locate isolation (expansion) joints at high points to
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/10/2009 for the course ENGR BCEE 345 taught by Professor Drgala during the Winter '07 term at Concordia Canada.

Page1 / 12

CPCI_Precast_Corrosion_n - PRECAST / PRESTRESSED CONCRETE...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online