Abstract
Application of fibre sheets to strengthening reinforced concrete members has been investigated extensively. This paper presents the results on the use of composite local materials such as woven roving glass fibre sheets and epoxy to flexural strengthening of reinforced concrete beams. As many as 24 specimens with variation on the number of fibre layers (one and two layers) and end anchorage techniques (fasteners, U-shape straps, steel bolts) have been tested. It is shown that the effectiveness of glass fibre can be attained only on the specimens with one-layer sheet indicated by the rupture of fibre composite before specimen failure. Strengthening using two layers, bonding failure and delamination of fibre occur before the fibre develops maximum strength. Applying end anchors on the cut-off point of the two layers of fibreglass improves performance of the composite materials in the range of 5.0% to 16.5%. In addition, the end anchors also prevent delamination of the fibre sheet to occur at the cut-off point.
Highlights
Application of carbon, aramid and glass fibre reinforced polymer (CFRP, AFRP and GFRP) with epoxy bonding agent to strengthen reinforced concrete beams have been studied extensively for decades [1,2,3,4]
There are local products of woven roving fibres glass sheet (GFRP sheet) that are usually used to build boats and canoes with local epoxy resin (®Avian) that may be used to flexural strengthen reinforced concrete beams. These composite materials between GFRP sheet and epoxy have been tested in the laboratory as concrete confinement [8] and shear strengthening of beams [9]
End anchor of GFRP using bolts enabled the two layers of GFRP sheet to develop their capacity indicated by fibre rupture
Summary
Application of carbon, aramid and glass fibre reinforced polymer (CFRP, AFRP and GFRP) with epoxy bonding agent to strengthen reinforced concrete beams have been studied extensively for decades [1,2,3,4]. Some efforts have been done to overcome debonding problems such as roughening the concrete surface [5,6] and using CFRP spike anchors [7] These techniques can significantly improve the performance of the FRP strengthened beams. There are local products of woven roving fibres glass sheet (GFRP sheet) that are usually used to build boats and canoes with local epoxy resin (®Avian) that may be used to flexural strengthen reinforced concrete beams. These composite materials between GFRP sheet and epoxy have been tested in the laboratory as concrete confinement [8] and shear strengthening of beams [9].
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