Infrastructure

Infrastructure

Strengthening Structures That Matter To Us All

Carbon Fibre Reinforced Polymer (CFRP) composite systems have been used for structural strengthening of aging or damaged infrastructure for several decades.

Lightweight, high strength, corrosion resistant and thermally compatible, CFRP composite systems can be applied over existing structures to significantly extend their lifetime while maintaining their design integrity.

The cost-effective and innovative solution prevents expensive rebuilds of buildings and bridges and ensures minimal impact to the public by way of closed roads and detouring.

FRP Structural Strengthening Systems can be used in infrastructure on concrete, masonry, steel, and wood structures to increase their strength and lifespan both domestically and globally.

Structural Strengthening Systems – Advantages

  • Very high tensile or flexural strengths can be achieved.
  • Easy to transport.
  • Can be coated without preparation.
  • Alkali resistant.
  • Fast and easy installation – reducing overall installation cost of strengthening.
  • Durable – non-corroding even if in contact with moisture.
  • Thin section compared to traditional methods -Low profile (thickness) does not impact on architectural aesthetics or reduce useable space.
  • Simplified designs enable engineering to easily calculate amount of reinforcement required to overcome applied loads

Structural Strengthening Systems – Intended Use

CFRP systems provide a very practical tool for strengthening and retrofit of concrete structures, and are used in Beams, Columns and Concrete Slabs.

CFRP strengthening systems can be used for strengthening due to increased load capacity or aging structures by way of:

  • Increasing Flexural strengthening
  • Increasing Shear strengthening
  • Increasing axial load capacity
  • Alkali resistant.
  • Increasing ductility
  • Increasing compressive strength of concrete
  • Increasing flexural moment capacity

FRP systems have also been successfully used for seismic upgrading of concrete structures.

These applications include mitigating brittle failure mechanisms such as shear failure of unconfined beam-column joints, shear failure of beams and/or columns, and lap splice failure.

FRP systems have also been used to confine columns to resist buckling of longitudinal steel bars. These FRP schemes increase the global displacement and energy dissipation capacities of the concrete structure and improve its overall behaviour.

Because of the resistance to corrosion, CFRP composites can be utilised on interior and exterior structural members in all almost all types of environments.

Structural Strengthening Systems – Compliance

  • Vic Roads Specification Section 688 – Fibre Reinforced Polymer Composite Strengthening of Concrete Structures
  • AS5100.8:2017 – Bridge Design, Part 8 Rehabilitation and Strengthening of existing bridges & Appendix A
  • AC125 – Acceptance Criteria for Concrete and Reinforced and Unreinforced Masonry Strengthening Using Externally Bonded Fiber-Reinforced Polymer (FRP) Composite Systems
  • ACI 440.2-08 – Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures
  • ACI 440.3-12 – Guide Test Methods for Fiber-Reinforced Polymers (FRPs) for Reinforcing or Strengthening Concrete Structures

  • ACI 440.6-08 – Specification for Carbon Fiber-Reinforced Polymer Bar Material for Concrete Reinforcement