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Information Sciences Letters

Information Sciences Letters

Abstract

The technique of fibre-reinforced polymers (FRP)-strengthening of concrete columns has emerged in recent years as an excellent alternative to the iron plate reinforcement and strengthening using reinforced concrete cover. That is because the mechanical properties of fibre-reinforced polymers (FRP) being (lightweight, has excellent tensile resistance, has high corrosion resistance) and finally speed of work execution. In this research, the behaviour of short reinforced concrete columns with circular sections and strengthened with treated natural jute and non-treated jute fibres was studied. The practical program includes casting and testing 24 specimens of short circular tubed reinforced concrete columns where laboratory testing was carried out under axial compression load. All columns were 700 mm in height and 150 mm in diameter. Regarding fibre treatment, there are four methods used in this research; chemical treatment, thermal treatment, red iron oxide treatment and epoxy treatment. The results showed that the columns strengthened by jute fibres, in general, have higher durability than the unstrengthened columns. Moreover, it was shown that the treatment of jute fibres in the four different ways has a significant effect on improving the performance of jute fibres in the process of strengthening in different proportions depending on the nature of the treatment, where the strengthening of the regular untreated fibres led to an increase in ultimate load capacity by 24.8%. Besides, the process of jute fibre treatment (chemical, thermal, red iron oxide and liquid epoxy) resulted in an increase of ultimate load by 35.6%, 39.28% 48.56% and 59.07% respectively compared with reference columns. The results also showed that the strengthening of jute fibres reduced the agitation and longitudinal deformations of the columns at the same load values as well as increased both ductility and toughness with the increase of ultimate load.

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