In a groundbreaking study published in ‘Composites Part C: Open Access’, researchers have unveiled innovative methods to repair reinforced concrete beams that have been damaged by high temperatures. This research, led by Ahmed Ashteyat from the Department of Civil Engineering at Prince Sattam Bin Abdulaziz University and the University of Jordan, highlights the efficacy of using Basalt Fiber Reinforcing (BFRP) bars and Carbon Fiber Reinforced Polymer (CFRP) ropes and strips to restore the structural integrity of these beams.
The study focused on eleven reinforced concrete beams, each measuring 200mm in width, 300mm in depth, and 1800mm in span length. After a curing period of 28 days, ten of these beams were subjected to extreme conditions, heated for three hours at a scorching 650 °C. This high-temperature exposure mimicked the kind of damage that can occur in real-world scenarios, such as fires or industrial accidents. Following this, the researchers employed a near-surface mounted technique (NSM) to repair nine of these heat-damaged beams using various configurations of BFRP bars and CFRP ropes and strips. One beam remained unrepaired as a control sample.
The results were striking. The use of NSM CFRP ropes significantly enhanced the shear capacity of the damaged beams, with ultimate loads increasing by 40% to 95% compared to the control beam. “The highest improvement in maximum load capacity was achieved by using an inclined rope positioned at 150 mm,” Ashteyat noted. In contrast, the BFRP bars also contributed positively, increasing the maximum load by 37% to 63%, depending on their configuration and spacing.
What does this mean for the construction sector? The ability to effectively repair and strengthen concrete structures exposed to high temperatures could revolutionize the approach to building safety and sustainability. “Our findings suggest that the overall effectiveness of CFRP ropes in increasing shear capacity is 32% higher than that of BFRP bars,” Ashteyat added, emphasizing the potential for engineers to select the most effective materials for specific repair scenarios.
This research not only presents a viable solution for enhancing the longevity of concrete structures but also offers a cost-effective alternative to complete replacements. As construction companies increasingly face the challenges of maintaining aging infrastructure, the implications of this study could lead to significant savings and improved safety standards in the industry.
The advancements in repair technologies highlighted in this research are crucial as they pave the way for future developments in construction practices. By utilizing innovative materials like BFRP and CFRP, the industry can enhance the resilience of structures, ultimately leading to safer environments for communities.
For further insights into this transformative research, you can explore the work of Ahmed Ashteyat at Prince Sattam Bin Abdulaziz University.