Unsuitable environmental conditions of mines, wet, coastal and marine areas and even refineries sometimes cause cracks, corrosion of reinforcement and damage to the foundation and foundation. in some cases , Even an inappropriate design in which the quantity of strengthening elements is not included increases these problems.
today, Companies and employers put the reinforcement of the foundation using FRP on their agenda to prevent such damage to the foundation, pile or base. All types of composite and polymer products can largely prevent such damages from reaching the foundations of your structure.
Now the use of FRP in repair and strengthening projects has become very widespread. Significantly damaged structures can be strengthened using FRP materials. Due to infrastructure erosion and the need to reinforce structures to meet precise design needs, In the past two decades, The focus on strengthening and restoring structures has spread throughout the world. On the other hand , The seismic strengthening of structures, FRP applications in repair, reinforcement and strengthening projects are currently widespread.
The unique properties of this material, Including light weight, High wear resistance, High tensile strength and simple implementation, This makes it a quick alternative to traditional strengthening methods. FRP sheets of different types and with different mechanical properties are installed as external reinforcement at the required level of concrete members and play the role of additional load resistance.
The reliability of the FRP bonding system mainly depends on the proper transfer of stress from the concrete to the FRP sheet by the interface. Applying an FRP layer under the beam changes the bending state of the element from flexible to brittle.
Advantages and characteristics of strengthening the foundation and pillar using FRP fibers
below, Briefly mention the benefits of using FRP fibers:
- Increase the axial strength and shear strength of the foundation
- It acts as a barrier to the penetration of moisture and oxygen into the foundation and substrate. Thus significantly reducing wear
- The change in foundation dimensions is close to zero
- Speed of execution without disrupting the process
- The low thickness of FRP fiber makes the FRP composite sheets thin (on the order of millimeters) and makes them not occupy extra space.
- The reasonable price of FRP composite polymer materials from Avzir Company has led to an increase in its sales in Iran and other countries in recent years.
- FRP polymer composite materials have low weight and the density of the resulting FRP sheets and materials is low
- Tensile strength and high elastic modulus of FRP polymer composite materials
- The connection of a sheet, sheet, or sheet of FRP to different surfaces of concrete and iron is considered good, and its overlap is not much. Which leads to lower price of FRP polymer composite materials
- Easy transportation due to the low weight of FRP composite polymer materials
- Increases bending strength for positive and negative torque zones
- Increases shear strength
- Increases stiffness under service loads
- Reduces crack width for increased durability and wear resistance
- By reducing moisture penetration into the crossbar, It delays the rate of corrosion in the future
- Do not reduce customs clearance (for example in garages or parking lots)
- Less expensive than traditional methods
Was implementing these fibers as a known solution able to reduce concerns?
Strengthening concrete columns using FRP is a method to strengthen and increase the resistance of concrete columns against earthquakes, shrinkage, corrosion, heat, fire or strengthening columns until optimal performance.
in buildings, Rust, corrosion, increased live or dead weight, and construction errors often lead to weak columns that require strengthening. Using FRP materials is a quick and cost-effective way to strengthen concrete columns. today, The price of strengthening concrete columns with FRP is low compared to traditional methods. It is easy and cheap to implement.
FRP as a strengthening solution for submerged piles
Recent earthquakes around the world revealed the weakness of bridges and many material and human losses as a result of their destruction. In many cases, When the foundations are under water, Carrying out the strengthening of the bridge becomes more difficult. FRP can be used for any type of pile and in any case increases strength significantly. Because it does not depend on the type of bridge foundation and its implementation.
At the ends of the wax and a space, there is a gap between the wax and the wax with a base.
The main application of underwater piles is in river bridges and offshore platforms. Repeated drying and wetting cycle increases the corrosion rate in steel and concrete of submerged piles. A common solution for corrosion protection is to make a plaster of fiberglass and run it around the substrate and then fill the gap between the casting and the substrate with resin.
These plasters do not add any structural strength to the damaged substrate. in addition to , Since these plasters are seamless, Oxygen and moisture can still reach the surface of the substrate and continue corrosion. The use of this type of fiber can greatly contribute to extending the life of these substrates. Among other benefits of using it, The following can be mentioned.
- Features and benefits
- Increasing submerged piles (small columns), axial, shear and bending
- Ideal solution for re-strengthening water damaged block
- Reducing the size of reinforced piles after strengthening them with the help of polymer composite materials
- Eliminate the step of repairing the concrete surface by the main strengthening process
- Reduced wear resulting from the integration of this method
- High-speed implementation of strengthening submerged piles