A feasibility study in which a pultruded fibre reinforced polymer (FRP) plank was used as stay-in-place (SIP) form serving as formwork during wet stage and as reinforcement during hardened stage is presented here. First, the strength and stiffness of the FRP plank serving as formwork for concrete casting under construction stage was verified by sand-filling test. Then shear tests were carried out to develop proper bond technique between FRP and concrete, so that they can perform as composite structural member. Thirdly, static tests on beams were conducted to evaluate the load-carrying capacity and failure modes of the proposed hybrid beam. The overall investigation showed the feasibility of using the FRP plank as a SIP formwork.Keywords: Adhesive and aggregate bonding, fibrereinforced polymer, stay-in-place formwork.ONE of the key objectives of construction research is to develop an innovative, economical and efficient method of construction. In recent years the use of composite fibre reinforced polymer (FRP) materials has gained wider acceptance in the civil engineering sector, due to some desirable characteristics such as lightweight, high strength, resistance to corrosion and durability [1][2][3] . FRP composites, as a mature technology, have been widely used to repair/retrofit/reinforce damaged/degraded concrete structures 4,5 , such as steel reinforced concrete (RC) beams or columns by externally bonding FRP sheet(s) onto the surface of substrate concrete structures 6,7 . Developments in the use of FRP in construction have led to the concept of FRP structural stay-in-place (SIP) formwork systems. This is a permanent participating formwork system which is structurally integrated with concrete. It acts as self-supporting formwork during construction, and as structural reinforcement once the concrete hardens. The concept of using FRP composites for structurally integrated SIP formwork maximizes the advantages of both FRP and concrete while simplifying the construction process and reducing construction time and labour cost. Structural system will make appropriate use of FRP in tension and concrete in compression. A significant cost-saving can be achieved using FRP SIP forms, as they reduce labour cost and time related to putting and stripping of conventional formwork. In flexural members, the FRP plank act as primary reinforcement, thus reducing the need for steel reinforcement. [16][17][18] , flat plates with T-shaped ribs [19][20][21][22] , thin plates bonded to the bottom of a layer of grid reinforcement 23 , corrugated plates with pin-and-eye interlocking joints 24 , and FRP box section 25 . The studies show a huge potential for the hybrid FRP and concrete construction, where each material is optimally used. The cost and time effectiveness using SIP formwork promises a great impact on the Indian economy. New FRP profile manufacturing industries using the pultrusion process are now coming up in India. Pultrusion is an economical and continuous method of fabricating FRP profiles of a constant cross-section b...
Stay-in-Place (SiP) formworks obviate the transportation, placement, removal and storage requirements of conventional formworks. Fibre Reinforced Polymer SiPs (FRP-SiP) have additional advantages, such as corrosion resistance, high specific strength and durability. This paper discusses an experimental instigation consisting of two sets of slabs having varying span-to-depth ratios cast on an FRP-SiP. Control specimens with conventional steel bar reinforcements were also cast. Several treatments for improving interfacial bonds at the interface between concrete and FRP-SiP have been investigated. Cyclic flexural tests were performed to evaluate their structural performance. Load-displacement relationship and load capacity are presented. Failure envelopes and energy absorption capacity were evaluated. It was found that the load capacity of FRP-SiP was around 107% greater than the conventional steel rebar specimens. Bond treatment on the FRP-SiP specimens increased the load capacity by around 215% over the untreated specimens. The load-deflection behaviour and the failure modes of the FRP-SiP specimens were distinctly different from those of the conventional specimens. The flexure and shear provisions in American Concrete Institute Standards (ACI 440) were found to be conservative in comparison to the present results. This study demonstrates that FRP-SiPs improve both the structural performance and construction efficiency of concrete slabs, however, new standards would be necessary to be able to utilize their improved capacity.
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