Menu
Search
Filters
Close
Menu

99563 EVALUATION OF STEEL REINFORCEMENT CORROSION IN CONCRETE DRAINAGE CULVERTS

Picture for 99563 EVALUATION OF STEEL REINFORCEMENT CORROSION
Available for download
Product Number: 51300-99563-SG
ISBN: 99563 1999 CP
Author: M.A. Pech-Canul and A. A. Sagues
$0.00
$20.00
$20.00
In an investigation in progress, reinforced concrete test specimens cut from two different sources of concrete culvert pipe were tested under cyclic saltwater pending and under constant exposure to seawater. The specimens were electrochemically monitored over 700 days (cyclic test) and 400 days constant exposure for evidence of corrosion initiation and measurement of resulting corrosion rates. Corrosion initiation took place after a few months of exposure in the cyclic pending tests. The corrosion was localized and developed at regions where the concrete cover was lowest (but still within a range consistent with manufacturing practice). Corrosion rates after initiation in the affected spots were estimated to be sufficient to cause concrete cover deterioration after a few years. No corrosion initiation took place after 400 days of continuous exposure to simulated seawater. Near-surface chloride concentrations were much higher in the concrete exposed to cyclic pending than in that continuously exposed to salt water. Within each exposure regime, the concrete containing fly ash developed a higher near-surface chloride content than the OPC. The apparent chloride diffusivity of the OPC concrete was greater than that of the concrete containing fly ash, even though the reported total binder content of the OPC concrete was higher. The average estimated threshold chloride concentration under cyclic pending conditions for fly ash containing concrete was - 0.6% of binder content. For OPC concrete it was - 0.34% of binder content, but the latter value may be underestimated since stable corrosion initiation in the OPC concrete was not observed. Keywords: concrete, culverts, chlorides, pending, fly ash, durability.
In an investigation in progress, reinforced concrete test specimens cut from two different sources of concrete culvert pipe were tested under cyclic saltwater pending and under constant exposure to seawater. The specimens were electrochemically monitored over 700 days (cyclic test) and 400 days constant exposure for evidence of corrosion initiation and measurement of resulting corrosion rates. Corrosion initiation took place after a few months of exposure in the cyclic pending tests. The corrosion was localized and developed at regions where the concrete cover was lowest (but still within a range consistent with manufacturing practice). Corrosion rates after initiation in the affected spots were estimated to be sufficient to cause concrete cover deterioration after a few years. No corrosion initiation took place after 400 days of continuous exposure to simulated seawater. Near-surface chloride concentrations were much higher in the concrete exposed to cyclic pending than in that continuously exposed to salt water. Within each exposure regime, the concrete containing fly ash developed a higher near-surface chloride content than the OPC. The apparent chloride diffusivity of the OPC concrete was greater than that of the concrete containing fly ash, even though the reported total binder content of the OPC concrete was higher. The average estimated threshold chloride concentration under cyclic pending conditions for fly ash containing concrete was - 0.6% of binder content. For OPC concrete it was - 0.34% of binder content, but the latter value may be underestimated since stable corrosion initiation in the OPC concrete was not observed. Keywords: concrete, culverts, chlorides, pending, fly ash, durability.
PRICE BREAKS - The more you buy, the more you save
Quantity
1+
5+
Price
$20.00
$20.00
Product tags
Also Purchased
Picture for 98639 CATHODIC PROTECTION OF REINFORCEMENT
Available for download

98639 CATHODIC PROTECTION OF REINFORCEMENT IN CARBONATED CONCRETE

Product Number: 51300-98639-SG
ISBN: 98639 1998 CP
Author: L. Bertolini, F. Bolzoni, P. Pietro, T. Pastore
$20.00
Picture for 02228 CORROSION PROTECTION OF NEW...
Available for download

02228 CORROSION PROTECTION OF NEW REINFORCED CONCRETE STRUCTURES

Product Number: 51300-02228-SG
ISBN: 02228 2002 CP
Author: Prof. Efim Ya. Lyublinski, Dr. Donald A. Kubik, and Chuck M. Zvosec
$20.00
Picture for 03387 MONITORING OF REINFORCEMENT CORROSION
Available for download

03387MONITORING OF REINFORCEMENT CORROSION IN CONCRETE STRUCTURES IN THE FIELD.

Product Number: 51300-03387-SG
ISBN: 03387 2003 CP
Author: John Broomfield, Kevin Davies, Karel Hladky, Paul Noyce
$20.00
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support