This special issue focuses on the role of nanotechnology and polymer nanocomposites in enhancing the performance and bonding efficiency of near-surface mounted (NSM)-Fiber-Reinforced Polymer (FRP) retrofitting systems for concrete structures. Traditional FRP systems have been effective for structural retrofitting, yet the integration of nanomaterial-modified epoxy adhesives (NMEAs) promises to further improve bonding characteristics, durability, and overall structural integrity.

The objective of this issue is to bridge the research gap on nanotechnology-enhanced bonding agents, such as carbon-based and silicon-based nanomaterials, in NSM-FRP applications. Nanomaterials can optimize retrofitting by improving adhesive mechanical properties, reducing failure risks, and boosting performance under environmental and loading conditions.

NSM-FRP retrofitting has gained importance for strengthening concrete structures due to its superior load-bearing and bonding properties. However, limited research exists on how nanotechnology can further enhance adhesives used in NSM systems. Investigating nanomaterials like carbon nanofibers, cellulose nanocrystals, and silica Nano powder in these systems is crucial for advancing sustainable infrastructure. This special issue encourages the exploration of polymer nanocomposites for structural retrofitting, driving innovation at the intersection of nanotechnology and concrete reinforcement.

The main goal is to explore how nanomaterial-modified adhesives can improve the performance of NSM-FRP retrofitting systems. We invite studies focused on the development, testing, and application of polymer nanocomposites, particularly those that enhance bonding, durability, and failure resistance.

We welcome contributions in the form of original research articles, review articles, case studies, and technical notes. Articles should focus on experimental, theoretical, and computational studies related to nanotechnology and polymer nanocomposites in NSM-FRP retrofitting systems. Interdisciplinary perspectives from materials science, structural engineering, and nanotechnology are encouraged to foster a comprehensive understanding of the topic.

Through this special issue, we aim to advance the integration of nanotechnology in structural retrofitting, providing a deeper understanding of how NMEAs and polymer nanocomposites can improve the bonding efficiency and durability of NSM-FRP systems. Researchers from various disciplines are invited to contribute, as their insights will play a crucial role in bridging the knowledge gap and advancing the field of sustainable concrete retrofitting.