Development of a simplified bond stress–slip model for bonded FRP–concrete interfaces

Strengthening by fiber-reinforced polymers (FRPs) is one of the most common solutions to the ageing infrastructures. However, long-term durability of such systems under different environmental conditions needs to be understood properly before widely adopting these methods in the field. This paper presents research outcomes from an experimental program carried out to determine the influence of moisture on the durability of the bond between FRP and concrete along with its constituent materials. Performance was evaluated through single lap shear bond tests and various kinds of tests on the resin samples, including water absorption, mechanical characterization, and glass transition temperature (Tg) analysis. The specimens were exposed to continuous water immersion and wet-dry cycles for a maximum period of up to 24 and 18 months, respectively. The results show some deterioration on the material and the bond properties in both exposure conditions. The bond strength decreased up to 32 and 12% for high-s...

/pdf/durability-of-frp-concrete-bonds-and-its-constituent-4ogyl3o96m.pdf

Durability of FRP Concrete Bonds and Its Constituent Properties under the Influence of Moisture Conditions

A review of test methods for studying the FRP-concrete interfacial bond behavior

Bond stress – slip characteristics play a major role in the behaviour of EBR FRP strengthened RC beams. These characteristics are normally determined by using experimental data from small-scale bond tests. However, the research community is yet to agree on a unified experimental set-up and testing procedure for these tests. The lack of standard tests leads to high variability in published results and hinders the development of reliable design models. The testing programme presented herein was part of an international Round Robin Test (iRRT) exercise, aimed at assessing the suitability of double shear tests to characterise the bond behaviour of FRP strengthening systems. A total of 20 tests were performed on different FRP plates. Recommendations on how to improve the iRRT methodology are given. Based on the results, an improved capacity model that accounts for concrete surface preparation is proposed and validated against an extensive database of published results. The outcome of the current research is expected to provide engineers with more confidence in designing safely strengthening applications whilst making the best use of the FRP materials.

Standardised double-shear test for determining bond of FRP to concrete and corresponding model development

Externally bonded fibre reinforced polymer (FRP) has been proven to be a successful strengthening technique for deteriorated and aged structures. In the last two decades, an extensive number of stu...

https://www.tandfonline.com/doi/pdf/10.1080/23311916.2018.1525015

Critical review of strength and durability of concrete beams externally bonded with FRP

Addition of graphene oxide to ZIF-8/HKUST-1 composite for enhanced adsorptive and photocatalytic removal of congo red in wastewater

This paper summarizes the research findings of an extensive experiment conducted on Carbon Fibre Reinforced Polymer “CFRP” bonding and its relationship with the level of the concrete surface preparations.  The experiment is conducted with 90 samples prepared using different surface preparation procedures each with different degrees of surface roughness. The experiment has revealed interesting results regarding the type of methods that should be used for surface preparation and optimum degree of surface roughness. The experimental results indicated that there is a minimum level of surface roughness below which bonding strength is negatively influenced. Below that level of surface roughness the concrete surface behaves very similar to surface with no preparation whatsoever. Although the relationship between surface roughness and adhesion properties are known already, it was surprising to see that  some surface preparation methods generated bonding strengths which are considerable inferior to other methods even for the same degree of surface roughness. Another very interesting result of the study was the debilitating affect of some surface preparation methods on the strength of the concrete substrate. The results has indicated that use of such techniques generate good quality rough surface for bonding but reduces the strength of the concrete substrate considerably.

Investigation of the Effect of Surface Preparation Method and the Degree of Surface Roughness on CFRP-Concrete Bonding and Substrate Strength

Electrospinning enables simple and cost-effective production of polymer nanofibers from different polymer materials. Drug delivery systems are capable of achieving maximum drug treatment benefits by significantly reducing adverse complications. Electrospun nanofibers have recently attracted considerable attention owing to their distinctive properties, including flexibility and biocompatibility. The implementation of functional constituents within nanostructure fibers blends is an effective technique for the administration of a variety of drugs in animal research, broadening the nanofiber capability and reliability. The nanofibrous mesh and its various application purposes are discussed in terms of a summary of recent research, emphasizing the ease of streaming and a large number of combinations of this approach, which could lead to a breakthrough in targeted therapy.

/pdf/advancement-of-nanofibrous-mats-and-common-useful-drug-1it573gj.pdf

Advancement of Nanofibrous Mats and Common Useful Drug Delivery Applications

Tissue engineering is a cutting-edge discipline that brings together scientific and health-related, biological, and engineering principles in order to build tissue-engineered constructions able to restore or sustain the physiological properties of native tissue, or to marginally enhance those properties. This field is called "regenerative medicine". By constructing structures that are analogous to the extracellular matrix, it will be possible to improve the transmission of oxygen and nutrients, as well as the release of toxins during the process of tissue healing, all while simultaneously maturing tissues. Over the past few years, various studies have concentrated on looking at nanostructures in three dimensions with the goal of using them in tissue engineering. In this group of methods, electrospinning stands out as one of the most successful options. Over the course of the past few decades, a great number of nanofibrous scaffolds have been produced for the purpose of restoring and repairing damaged tissue. In this article, the engineering of new tissues using nanofibrous textures as scaffolds are reviewed. In addition, recent developments in tissue regeneration and the difficulties related to electrospinning are discussed in this article, along with their respective solutions.

Emerging development in polymeric electrospun nanoscale mats for tissue regeneration: narrative review of the literature

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Addition of graphene oxide to ZIF-8/HKUST-1 composite for enhanced adsorptive and photocatalytic removal of congo red in wastewater

Investigation of the Effect of Surface Preparation Method and the Degree of Surface Roughness on CFRP-Concrete Bonding and Substrate Strength

Advancement of Nanofibrous Mats and Common Useful Drug Delivery Applications

Emerging development in polymeric electrospun nanoscale mats for tissue regeneration: narrative review of the literature