In a significant advancement for the construction industry, researchers have unveiled a novel approach to enhancing the structural integrity of one-way reinforced concrete slabs. The study, led by Ali Kheyroddin from the Department of Civil Engineering at Semnan University in Iran, explores the use of High-Performance Fiber-Reinforced Concrete Composite (HPFRCC) laminates, which incorporate synthetic fibers, to bolster the performance of these essential structural components.
One-way slabs are integral to various infrastructures, including buildings and bridges, yet many exhibit vulnerabilities due to reduced flexural capacity and environmental wear. Natural disasters, such as earthquakes, have further highlighted these weaknesses, prompting the need for effective repair and strengthening solutions. “Repairing and strengthening these structures using modern materials can be vital and economical,” Kheyroddin emphasizes, underscoring the urgency of the issue.
The study involved constructing 12 full-scale slab specimens, all designed to the same specifications with a characteristic strength of f’c=21 MPa, as per ACI318 regulations. Among these, a normal reference slab was reinforced with four No.8 bars in the tensile area, while others had their tensile bars reduced by 50%. The innovative aspect of this research lies in the application of HPFRCC laminates, which were affixed to the slabs using epoxy grout through the near-surface mount (NSM) method.
Testing revealed remarkable results: the flexural strength of the reinforced slabs surged by two to three times compared to their unreinforced counterparts, while displacements remained significantly limited. This enhancement not only promises to extend the lifespan of existing structures but also offers a cost-effective solution for maintenance and retrofitting in the face of increasing natural threats.
Kheyroddin’s findings could reshape future construction practices, particularly in regions prone to seismic activity. The commercial implications are profound; as construction firms seek to optimize safety and durability, the integration of HPFRCC laminates could become a standard practice, leading to reduced insurance costs and enhanced public confidence in infrastructure resilience.
Published in the journal Mechanics of Advanced Composite Structures, this research signifies a pivotal moment for the construction sector. The advancements in material science and engineering not only pave the way for innovative building techniques but also reflect a broader commitment to sustainability and safety in civil engineering.
For more information on Ali Kheyroddin’s work, you can visit the Department of Civil Engineering at Semnan University.