Traditional Systems

To address these challenges, a range of strengthening technologies has been introduced to the market. Traditional methods include section enlarfements using reinforced concrete, steel plate bonding, and, more recently, fibre-reinforced polymer (FRP) systems.

Despite their effectiveness, these approaches present limitations: reinforced concrete jacketing increases dead load and geometric footprint, steel systems are susceptible to corrosion and can be difficult to install and FRP solutions, although lightweight, often lack fire resistance and may rely heavily on the quality of the substance.

Moving Towards Lightweight and Highly Durable Systems

Over the past two decades, innovation in materials science has led to the development of high-performance alternatives. One such advancement is High-Performance Concrete (HPC), a class of cementitious composites offering superior strength, ductility, and durability in thinner profiles.

Originally developed for use in new structural elements to achieve higher mechanical performance within reduced cross-sectional dimensions, HPC has more recently been adapted for the retrofitting of existing structures. These high-performance mortars are characterised by ultra-high compressive strength, excellent post-cracking behaviour, and exceptional bond performance to substrates.

Experimental studies have demonstrated HPC’s capability to enhance structural capacity with minimal additional thickness. For example, tests on full-scale reinforced concrete columns jacketed with thin layers of HPC have shown significant increases in axial load capacity and ductility. Likewise, overlaying deteriorated floor systems with low-thickness HPC screed has led to notable improvements in flexural stiffness and cracking resistance, even without the use of shear connectors.

Advantages

• Very high flexural and compressive strength
• Excellent adhesion
• Fibre reinforced
• High resistance to abrasion and impact
• High resistance to cyclical loads
• Impermeable to water

Mapei Solutions for Structural Strengthening

Mapei’s new range of high-performance cementitious mortars is designed for the structural repair and strengthening of reinforced concrete.

These advanced solutions combine durability, strength and ease of application across vertical, horizontal and overhead applications. With formulation tailored for both fluid and thixotropic placement, the range ensures consistent performance while incorporating fibre and steel reinforcement for enhanced crack resistance and long-term stability. suitable for use in infrastructure, industrial and civil construction projects.

Read more about the Plaintop HPC Range.

For more information contact Mapei;
Aviral Choudhary
Technical Engineer – Mapei Australia
Technical-AU@mapei.com.au