Seismic Performance of Prestressed Concrete Beam and Shear Wall with Innovative Epoxy Resin and Carbon Quantum Dots

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Seismic resilience of prestressed concrete structures remains a pressing challenge, particularly for beams and shear walls that are prone to brittle shear failure, debonding, and limited energy dissipation under cyclic loading. This chapter introduces a novel nanocomposite approach: epoxy resin modified with carbon quantum dots (CQDs), applied both to structural retrofitting of prestressed beams and to nonstructural curtain wall connections. CQDs, synthesized via a green hydrothermal route, impart enhanced toughness, adhesion, and crack resistance to the epoxy matrix while also enabling fluorescence-based self-sensing. Experimental programs on full-scale prestressed beams demonstrated that CQD-modified epoxy bonding prevented premature Carbon Fiber-Reinforced Polymer (CFRP) debonding, shifted failure modes toward ductile rupture, and increased drift capacity by 30% compared to conventional retrofits. Curtain wall connection tests revealed ∼35% higher energy dissipation and ∼ 50% greater stiffness when CQD-modified epoxy was used, with the added benefit of real-time damage detection through piezochromic fluorescence. Integrated system analysis confirmed that the dual application of CQD-modified epoxy improves both structural ductility and façade integrity, enabling immediate post-earthquake occupancy and reducing downtime. By merging nanotechnology with seismic engineering, this chapter establishes CQD-modified epoxy as a multifunctional material that enhances strength, durability, and smart monitoring capabilities, marking a paradigm shift toward intelligent, resilient infrastructure.

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