In a groundbreaking study published in the journal ‘Composites Part C: Open Access’ (translated from Thai as ‘Composites Part C: Open Access’), researchers have unveiled a promising approach to enhancing the structural performance of sustainable concrete, with significant implications for the energy sector. The research, led by Chisanuphong Suthumma from the Department of Civil Engineering at Kasetsart University in Thailand, focuses on the axial compressive performance of basalt fiber-reinforced polymer (BFRP) confined rectangular columns using recycled brick aggregates.
The study addresses a critical gap in existing research, which has primarily concentrated on circular and square columns. By exploring rectangular columns, the team has opened new avenues for the application of BFRP in construction, particularly in the energy sector where such shapes are commonly used in infrastructure projects.
The research involved testing 32 rectangular specimens to evaluate the influence of aggregate type, concrete grade, and the number of BFRP layers on axial compressive performance. The results were striking. “BFRP confinement significantly enhanced both strength and ductility,” Suthumma explained. “We observed maximum gains of 81% in strength and 230% in strain in low-strength natural aggregate concrete.”
While recycled brick aggregate concrete (RBAC) exhibited lower stiffness compared to natural aggregate concrete, BFRP confinement still provided up to 23% strength improvement. This finding is particularly relevant for the energy sector, where sustainability is increasingly becoming a priority. “The use of waste brick aggregates not only promotes sustainability but also offers a viable alternative to traditional aggregates,” Suthumma noted.
The study also revealed that the effectiveness of confinement reduced with increasing unconfined strength, highlighting the need for aggregate-specific design considerations. Post-peak analysis showed that additional BFRP layers delayed stiffness degradation, promoting more ductile failure. This could be a game-changer for the energy sector, where structures often need to withstand extreme conditions.
The experimental elastic modulus closely matched ACI predictions in natural aggregate (NA) specimens but was overestimated in RBAC due to its higher porosity. This underscores the importance of tailored design approaches for different types of aggregates.
The research employed design-oriented modeling to predict the complete stress-strain response of BFRP-confined concrete incorporating both natural and recycled brick coarse aggregates. The proposed approach closely predicted the response of BFRP-confined concrete, offering a reliable tool for future applications.
The findings of this study could shape future developments in the field by promoting the use of sustainable materials and advanced confinement techniques. As the energy sector continues to evolve, the need for durable, sustainable, and cost-effective construction materials will only grow. This research provides a compelling case for the adoption of BFRP-confined concrete, particularly in applications where rectangular columns are prevalent.
In summary, this study not only advances our understanding of BFRP confinement in rectangular columns but also paves the way for more sustainable and resilient infrastructure in the energy sector. As Suthumma puts it, “The future of construction lies in innovation and sustainability, and our research is a step in that direction.”