Abstract

This study presents the development of a new method for strengthening Reinforced Concrete (RC) slabs using Carbon Fiber Reinforced Polymer (CFRP) rods and an Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) external jacket with a Mechanical Anchorage System (MAS) under impact loading.

Introduction

Over the past few decades, the challenges associated with ageing and deterioration have become prominent issues in the construction field. Reinforced concrete structures are constructed to endure a range of environmental conditions throughout their anticipated operational lifespan. However, human errors such as changes in usage, structural design flaws, inadequate maintenance, and alterations in environmental conditions can lead to significant damage over time. These environmental factors can result in concrete deterioration, steel reinforcement corrosion, and ultimately, a loss of structural integrity.

As a result, these issues require careful consideration and innovative solutions to ensure the durability and longevity of constructed assets, and it is essential to strengthen or rehabilitate existing structures. In recent years, carbon fiber reinforced polymer (CFRP) materials have seen a notable increase in use as a strengthening technology. In the domain of FRP material utilization, the Externally Bonded (EB) and near-surface mounted (NSM) techniques stand out as the principal and extensively utilized approaches. The externally bonded technique involves the attachment of FRP sheets to the tension zone or soffit of the member’s surface.

Ultra-high-performance fiber-reinforced concrete (UHPFRC) is an innovative material that has been developed to be used for improving and strengthening reinforced concrete structures. UHPFRC material has higher compressive and tensile strengths, improved durability, enhanced ductility, and lowered permeability compared to conventional concrete. Due to its outstanding energy absorption capacities, the UHPFRC becomes an excellent material to resist impact loads and
blasts.