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September 3, 2023
RAAC Concrete: The Future… Is There One?

RAAC Concrete: The Future with Carbon Fibre Wrapping and Ground-breaking Resin Injection Techniques


Reinforced Autoclaved Aerated Concrete (RAAC) is a construction material with a complicated legacy. Once hailed as revolutionary, RAAC’s reputation has suffered due to long-term structural issues, sparking fears around the safety of buildings where it’s used.

Thankfully, innovative solutions like Carbon Fibre Wrapping and Ground Breaking Resin Injection Techniques offer a glimmer of hope.

Structural Repairs, a leading company in the field, is at the forefront of researching and implementing these cutting-edge methods.

This blog delves into the details of these new technologies and how they might extend the life of buildings with RAAC structures. For more information, you can reach out to Structural Repairs at 0300 030 1822 or [email protected].

A Brief History of RAAC

Introduced in the post-war era and widely used in the UK during the ’60s and ’70s, RAAC promised low-cost, rapid construction.

Its lightweight nature, coupled with good thermal insulation, made it a popular choice for everything from schools to hospitals.

However, the drawbacks have become more evident over time, with RAAC showing susceptibility to premature degradation and even catastrophic failure.

The Problem with RAAC

RAAC can be particularly vulnerable to moisture ingress, leading to corrosion of the reinforcement. Its lack of tensile strength makes it less resilient to changing weather conditions, particularly in the UK’s fluctuating climate.

Over the years, buildings with RAAC elements have encountered issues such as cracking, bowing, and in extreme cases, complete structural failure. Consequently, there has been a pressing need for remedial solutions to extend the life of such buildings.

RAAC Concrete: The Future

Carbon Fibre Wrapping

One of the most promising solutions is Carbon Fibre Wrapping. This technique involves the use of carbon fibre reinforced polymers (CFRP), a high-strength material, to wrap around the RAAC structures for added strength and durability.

How Does it Work?

The affected RAAC panel or beam is initially prepared by removing any loose or deteriorated concrete. Then, a high-strength epoxy resin is applied to the surface. Carbon fibre sheets are then wrapped around the element and left to cure.

The composite action of the carbon fibre and epoxy significantly enhances the structural strength of the RAAC element.

Benefits of Carbon Fibre Wrapping

  1. Enhanced Strength: Carbon fibre offers exceptionally high tensile strength, providing much-needed reinforcement to RAAC structures.
  2. Durability: Carbon fibre is highly resistant to environmental factors such as moisture and temperature changes, significantly reducing the rate of degradation.
  3. Non-intrusive: Carbon fibre wrapping can often be carried out without requiring the evacuation of the building, making it a convenient option.
  4. Cost-effective: This method can extend the lifespan of existing structures, eliminating the need for more expensive replacement procedures.
  5. Speed: The curing time for the epoxy is relatively short, allowing for rapid completion of repair work.

Ground Breaking Resin Injection Techniques

Another advanced solution being explored is resin injection. In this method, specialised resin materials are injected into cracks or voids within the RAAC elements to restore structural integrity.

How Does it Work?

Under controlled pressure, the resin is injected into the affected areas. As the resin cures, it expands, filling any voids and adhering to the concrete, thereby restoring the original structural properties.

Benefits of Ground Breaking Resin Injection

  1. Crack Filling: The resin effectively fills any cracks in the RAAC, preventing further ingress of moisture and other corrosive elements.
  2. Enhanced Load-bearing Capacity: By restoring the integrity of the concrete, the load-bearing capacity is often significantly improved.
  3. Reduced Downtime: Similar to carbon fibre wrapping, resin injection is less intrusive and can usually be performed without disrupting normal building operations.
  4. Environmental Resistance: The resins used are generally resistant to chemical and environmental degradation, providing a long-lasting solution.

Structural Repairs: At the Forefront of Innovation

Structural Repairs is committed to exploring these innovative techniques further, with rigorous research and field tests. They offer a range of services that include expert consultation, comprehensive inspection, customised solutions, and more.

Expert Consultation

Their team of experienced structural engineers can offer you an initial consultation to gauge the condition of the RAAC structures in your building and recommend the most appropriate remedial measures.

Comprehensive Inspections

They use state-of-the-art diagnostic tools for a detailed analysis, providing an in-depth report on the condition of the building and the required interventions.

Custom Solutions

Each building is unique, and Structural Repairs offers tailored solutions based on the specific needs of your structure. Whether it’s Carbon Fibre Wrapping, Resin Injection, or a combination of both, they’ve got you covered.

Reach Out for More Information

If you’re responsible for a building with RAAC elements and concerned about its structural integrity, it’s advisable to act sooner rather than later.

Structural Repairs’ relentless pursuit of research aims to extend the life of all buildings by leveraging these ground-breaking technologies. For more information or to schedule a consultation, you can contact them at 0300 030 1822 or via email at [email protected].

RAAC Concrete: The Future


The use of RAAC in UK buildings is a ticking time bomb that requires immediate and innovative solutions. The emergence of Carbon Fibre Wrapping and Ground Breaking Resin Injection Techniques offers a lifeline to extend the operational life of such buildings.

Structural Repairs is at the forefront of this important work, conducting research and offering solutions that could redefine the future of RAAC structures in the UK.

Time is of the essence, so don’t hesitate to reach out to them for expert guidance and tailored solutions to address the RAAC concerns in your building.

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