Utilization of Recycled Polyethylene Terephthalate (PET) Strips As an Alternative Confinement Material in Retrofitting Concrete Columns
Abstract Proceedings of 2019 International Conference on Resource Sustainability - Cities (icRS Cities)
Posted: 28 Jun 2019
Date Written: June 24, 2019
Concrete has been proven to be an essential material in the construction of structures in the development of modern and sustainable societies. With the goal of prolonging existing structures’ lifespan, retrofitting is done to increase their strength to better withstand external loads over time. Numerous technologies have been developed such as the use of fiber reinforced polymers (FRP) as confinement for structural members. However, the use of FRP such as carbon, glass, and aramid fibers are costly and is often limited to trade contractors of highly-specific and advanced technical skills. The development of societies has also brought vast environmental issues which has pushed researchers to innovate in terms of sustainable materials for construction – one of which is the use of Polyethylene Terephthalate (PET) Strips from recycled water bottles. The development of this alternative method provides (3) positive impacts: reduces the cost of retrofitting structures, reuses plastic waste, and enables developing societies more accessible solutions for retrofitting. For this study, both circular and square columns were evaluated. Fifteen cylindrical specimen (100 mm dia. x 400mm ht.) and sixty rectangular specimens (100mm x 100mm x 400mm ht.) were casted and confined with PET strips. The width of the strips, center-to-center spacing, bottle brand, and fastening method was varied. The prepared concrete samples’ compressive strength was then tested using a Universal Testing Machine (UTM). Results show the confined samples yielded significant increases in compressive strengths over their unconfined control groups. For the cylindrical specimen, its strength increased by 15%-70%. Moreover, the rectangular specimens’ strength increased by 37%-67%. The use of Polyethylene Terephthalate strips from recycled water bottles proves to be a viable alternative material for retrofitting concrete columns given by the significant increase in compressive strength.
Keywords: Concrete confinement, Retrofitting, PET Strips, Concrete Columns
JEL Classification: Q01, Q53, L74, F64, N65, Q20
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