PROTECTIVE COATINGS FOR CONCRETE BRIDGES

Protection of structures is very important for increasing the life of the structure. There is a growing national concern about premature deterioration of our concrete infrastructure projects such as bridges, aqueducts etc. requiring early repair and/or replacement. Use of protective coatings will increase the durability and hence the life of these structures. As most of these structures are made up of concrete and steel, the role that coatings play in protecting the surfa ....etc

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INTRODUCTION
Protective relaying is an integral part of any electrical power system. The fundamental objective of system protection is to quickly isolate a problem so that the unaffected portions of the system can continue to function. The flip side of this objective is that the protection system should not interrupt power for acceptable operating conditions, including tolerable transients.
The choice of protection depends upon several aspects such as type, rating of the protected equipment, its important lo ....etc

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Advantages of Prestressed Concrete Bridges


Owners and designers have long recognized the low initial cost, low maintenance needs and long life expectancy of prestressed concrete bridges. This is reflected in the increasing market share of prestressed concrete, which has grown from zero in 1950 to more than 55 percent today.

This growth continues very rapidly, not only for bridges in the short span range, but also for spans in excess of 150 feet which, heretofore, has been nearly the exclusive domain of structural steel.

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High performance concrete bridges
introduction
HPC is made with some basic ingredients but has totally different microstructure than ordinary concrete
HPC is an engineered concrete obtained through a careful selection
The low water/binder ratio of HPC that is its universal characteristics
It has very dense microstructure having a very fine and more or less well connected capillary system
Dense microstructure of HPC makes the migration of aggressive environmental conditions.
100 year old bridge
Lake alv ....etc

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Concrete Bridges


A. EMIN AKTAN, Drexel University
MICHAEL P. CULMO, CME Associates, Inc.
DAN M. FRANGOPOL, University of Colorado
CATHERINE W. FRENCH, University of Minnesota
BASILE G. RABBAT, Portland Cement Association
MARY LOU RALLS, Texas Department of Transportation
HENRY G. RUSSELL, Henry G. Russell, Inc.
DAVID H. SANDERS, University of Nevada
JOSEPH SHOWERS, Parsons Brinckerhoff
MAHER K. TADROS, University of Nebraska
STANLEY W. WOODS, Wisconsin Department of Transportation


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