10-08-2011, 02:25 PM
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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 alvord bridge is the the first reinforced concrete bridge in america
It was built in 1889 by ernest l. Ransome
It is the entrance to san francisco's golden gate park
The bridge was constructed as a single arch 64-feet wide with a 20-foot span.
Survived the 1906 earthquake and fire
Ncbc&hpc bridges
National Concrete Bridge Council (NCBC) promotes these bridges because of speed construction, strength and durability and provides great looks
Segments for the bridge's superstructure were cast using eight casting beds along the project site
Advantages of HPC bridges
COST SAVINGS
Minimizes maintenance
Reduces inspections
Affords longer lengths
Extends service life
DURABILITY
Resistant to harsh elements
Friendly to the environment
Daptable to requirements
Amazing
constructions
Hoover dam bypass bridge- across Colorado river, America
conclusion
These bridges are the bridges of 21st century
HPC bridges are the trade mark in civil engineering
HPC bridges provides efficient designs longer spans, fewer beams, and shallower structural depths
High performance, faster construction, reduced maintenance, longer service life, and low cost
It can be made with in few years.so it can meet traffic and environmental is with a low life-cycle costs.
