Pultruded FRP Plank as Formwork and Reinforcement for Concrete Members

Bank, Lawrence C.; Oliva, Michael G.; Bae, Han-Ug; Barker, Jeffrey W.; Yoo, Seung-Woon

doi:10.1260/136943307782417681

Cited by 34 publications

(16 citation statements)

References 9 publications

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“…The same epoxy resin and the mix ratio used in the CFRP channels was also used to bond the aggregate 207 on the surfaces of the CFRP channel. The thickness of the resin layer was maintained to be ~0.5 mm 208 10 in order to achieve a sufficient submersion of the aggregates whilst eliminating complete coverage of 209 aggregate (a 'smoothing' effect caused by the full coverage of epoxy on aggregate can weaken the 210 CFRP-concrete bond (Bank et al, 2007)). The aggregate coating was applied on two horizontal 211 surfaces at a time (see Fig.…”

Section: U-channel With Aggregate Coating 183mentioning

confidence: 99%

Towards innovative FRP fabric reinforcement in concrete beams: concrete–CFRP bond

Achintha

Alami

Harry

et al. 2018

Magazine of Concrete Research

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The paper reports results of an experimental investigation into load response and failure behaviour of rectangular prismatic concrete beams reinforced with a combined flexural and shear reinforcement system made from carbon fibre reinforced polymer (CFRP) fabric. It is shown that CFRP U-channels with aggregate coating and an anchorage system consisting of a lipped channel section with intermittent closed loops were found to provide improved composite action between the CFRP reinforcement and concrete. These CFRP channels also ensured adequate strength and ductility before failure. Possible modes of failures of the beams are discussed as is the effect of the design parameters on the failure mode and the failure load. It is anticipated that the findings of this paper could be effectively used in other applications such as non-prismatic concrete geometries and as permanent formwork/reinforcement in thin concrete members where the flexible characteristics of dry CFRP fabrics are most useful.

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Section: U-channel With Aggregate Coating 183mentioning

confidence: 99%

Towards innovative FRP fabric reinforcement in concrete beams: concrete–CFRP bond

Achintha

Alami

Harry

et al. 2018

Magazine of Concrete Research

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“…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.…”

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confidence: 99%

“…Aggregate bonding, adhesive bonding and mechanical anchors are some of the bonding methods that can be used to secure composite action between castin-place concrete and FRP plank. In aggregate bonding, first a layer of adhesive is applied on the plank and then aggregates are spread over it 19,[26][27][28] . The plank is allowed to cure for 2-3 days and then concrete is poured over it.…”

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confidence: 99%

“…Since FRPs are designed as thin-walled structural members, stress concentration introduced by the mechanical anchors could be large that leads to premature failure of the section 15 . It has been observed that both aggregate and adhesive bonding systems lead to significant increase in the ultimate load 19,20,22,24,[26][27][28][29][30] . Also, in both these bond mechanisms, adhesive plays a significant role in achieving bonding and hence choice of adhesive can be crucial.…”

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confidence: 99%

“…Also, in both these bond mechanisms, adhesive plays a significant role in achieving bonding and hence choice of adhesive can be crucial. All the previous studies regarding the bond between FRP stay-in-place formwork and concrete concentrate on the mechanism used for bonding the two materials 19,20,22,24,[26][27][28][29][30] . The studies were performed using only one adhesive without any justification relating to the choice of a particular adhesive.…”

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Pultruded Fibre Reinforced Polymer Planks as Stay-In-Place Formwork for Concrete Structures

Goyal

Mukherjee³

2017

Current Science

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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...

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Numerical Investigation of a New Floor System with GFRP Stay-in-Place Forms and Embedded I-Beams

Boules

Genikomsou

Jawdhari

et al. 2021

Lecture Notes in Civil Engineering

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Pultruded FRP Plank as Formwork and Reinforcement for Concrete Members

Cited by 34 publications

References 9 publications

Towards innovative FRP fabric reinforcement in concrete beams: concrete–CFRP bond

Towards innovative FRP fabric reinforcement in concrete beams: concrete–CFRP bond

Pultruded Fibre Reinforced Polymer Planks as Stay-In-Place Formwork for Concrete Structures

Numerical Investigation of a New Floor System with GFRP Stay-in-Place Forms and Embedded I-Beams

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