Your review on FRP bonding techniques for concrete strengthening can be classified into three main categories:

1. Mechanical Anchorage: Methods like anchors and bolts to prevent debonding.

2. Chemical Modification: Surface treatments and adhesives to improve bond strength.

3. Hybrid Connections: A combination of mechanical and chemical methods.

1. Widely Accepted Classification Standard for FRP Bonding Techniques

As of now, there isn't a universally standardized classification for FRP bonding techniques that is consistently applied across all studies. However, several approaches are commonly used, and the classification can depend on the focus of the study (mechanical vs. chemical properties, types of FRP materials, etc.). The most common classifications in existing literature are:

• Mechanical Anchorage: This involves methods like pins, bolts, or special anchor devices that physically connect the FRP to the substrate to prevent debonding.
• Chemical Modification: This refers to using adhesives or chemical treatments (like surface priming or coatings) that enhance the bond between the FRP and concrete, aiming to improve the interfacial strength.
• Hybrid Connections: A combination of mechanical anchorage and chemical modification, this method often includes both adhesive bonding and the use of anchors or mesh to enhance the bond strength.

The variation in the criteria can arise due to differences in experimental setups, the type of FRP being used, or the specific performance goals (e.g., increasing bond strength, durability, or long-term performance). It's essential to structure your classification framework to reflect the most relevant approaches to your review’s focus on anti-debonding strategies.

2. Should the Review Prioritize Engineering Application Scenarios or Mechanical Principles?

This depends on your target audience and the purpose of your review:

• Engineering Application Scenarios: If the primary goal of your paper is to serve as a practical guide for engineers or designers, focusing on real-world applications and the pros and cons of each bonding technique in different scenarios would be essential. This approach would be more accessible to practitioners in construction and structural engineering who are looking for direct solutions to apply to their projects.
• Mechanical Principles: If your goal is to delve deeper into the fundamental science and mechanics of debonding and strengthening mechanisms, prioritizing mechanical principles (e.g., shear strength, interfacial stresses, fracture mechanics) may be more suitable. This would be more relevant to researchers and academics who are interested in the theoretical underpinnings and modeling of FRP bonding.

You could also take a hybrid approach, where you discuss both the mechanical principles of bonding and the engineering applications. For example, you could explain the mechanical behavior in terms of adhesion, stress distribution, and failure modes, followed by an overview of how these principles inform the practical use of FRP bonding in different scenarios.

3. Recommended Literature

For your review, I recommend the following literature to get insights into both theoretical and application-based approaches for FRP bonding techniques:

• "FRP for Concrete Strengthening" by S. H. Rizkalla and M. F. Wight: This is an essential resource that covers various strengthening techniques using FRP, including discussions on bonding and debonding.
• "Fiber-Reinforced Polymer Composites for Structural Applications" by M. S. R. Anwar: Provides a detailed review of FRP bonding techniques, including anchorage systems and chemical modifications.
• "Strengthening of Concrete Structures with Fibre-Reinforced Polymers" by R. H. T. Maaddawy and M. S. S. El-Banouty: Discusses the practical applications of FRP, with a focus on bonding strategies and failure mechanisms.
• "Debonding of FRP Sheets from Concrete Substrates: A Review of Bonding Mechanisms and Debonding Prevention Techniques" in Composites Part B: Engineering: This article focuses specifically on debonding and anti-debonding strategies, reviewing mechanical, chemical, and hybrid approaches.
• "Bond Behavior Between Fiber Reinforced Polymer Composites and Concrete: A Review" in Journal of Reinforced Plastics and Composites: This paper gives a comprehensive review of the bond behavior and mechanisms for FRP applications on concrete.