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

COMPETITIVENESS• Value&Quality• Construction efficiency• Economic Impact

AESTHETICS• Provides architectural

distinction• Distinguishes the community.• Promotes economic

development and tourism

Disadvantages of bridges using hpc

Minor vibrations, transmitted from the equipments during repairing activity

Stresses resulting in debond of the repair mortar

CAN present in the core of concrete which was not apparently visible

Amazing constructions

Happy hollow bridge, tennesse, usa Jointless design (new design)

Hoover dam bypass bridge- across Colorado river, America

Icon federation bridge, canada built in early 80’s

Sunshine skyway bridge, floridaCompleted in 1987Length- 4.2 miles

SAGADAHOC BRIDGE, usa across the Kennebec River. completed in 2000

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.

High Performance Fiber Reinforced Concrete (HPFRC) Can be used to built super structure bridges

This is just a slight modification pakage of HPC

This can with stand huge earth quicks and other natural disasters

A new kind of concrete called Ductal is now in manufacturing process

Future expansion

Thank you