The objective of this experimental study is to evaluate the effect of treated and untreated Jute fibers on the behavior of concrete members. Fifteen samples of concrete reinforced by JFRP are subjected to a compression test. The main issues investigated are the ultimate load, and the effect of treatment on fiber morphology. It has shown that the treatment of fibers by 2% of Potassium hydroxide during 24h in a liquor ratio of 10:1 decreases the maximum load capacity. On the other hand, the reinforcement of concrete members using untreated Jute Fibers Reinforced Polymer (JFRP) increases the maximum load capacity. As well as the augmentation of the number of layers of fibers fabric increases the maximum load capacity of concrete of 36.6% and 57.3% in the case of C3-JFRP-2L, C3-JFRP-3L respectively.

The objective of this experimental study is to evaluate the effect of untreated and treated Jute fibers, on the behavior of concrete members. The first category of Jute fibers fabrics is treated in the alkaline treatment of 4% of NaOH solution and the second one in 2% of the Potassium hydroxide solution, during 24h in a liquor ratio of 10:1. In the case of specimens reinforced by treated fibers in 4% of NaOH have noted an increase of 25% compared to unreinforced specimens and 10.93% compared to untreated specimens. This concludes that the mechanical properties of the composite are enhanced by the treatment of the Jute fibers in 4% of NaOH. They become more compatible with the matrix, which increases the maximum load capacity of the reinforced specimens. On the other hand, it has seen that the treatment of fibers by 2% of Potassium hydroxide decreases the maximum load capacity of specimens reinforced by treaded fibers compared to untreated specimens. This means that the treatment by 2% of KOH has a negative effect on the properties of the Jute fibers fabrics.

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This paper presents an innovative method of reinforcement of concrete based on the use of the Jute fibers composites. These renewable raw bioresource fibers are available at a low cost. Moreover, they can be compared to Glass Fiber-Reinforced Polymer (GFRP) by enhancing the resistance of Jute Fiber-Reinforced Polymer (JFRP), while improving the compatibility between the fiber and the resin. For that purpose, this paper presents an experimental study that evaluates the influence of the curing conditions (time and temperature) on the behavior of JFRP laminates and concrete members strengthened by JFRP. The curing conditions at 30 °C for 2h 30min and at 50 °C for 1 h were the only two parameters studied and determined on the basis of Sikadur 330 properties and preliminary tests. Through the experimental tests, the maximum load capacity and observed failure modes are investigated. The results indicated that the curing at 30 °C for 2h 30min is the optimum curing condition. In addition, a low difference in the maximum load capacity was noted in the case of 50 °C. As to the failure modes, all the specimens cured with additional heat before being left under room conditions, have shown the ductile mode failure, especially in the case of specimens cured at 30 °C during 2h 30min. The analytical model conducted in this paper predicts the elastic modulus depending on temperature. The obtained results and proposed model can be used as input parameters in the analysis and design of externally strengthened members with Jute FRP composites.