by clicking the arrows at the side of the page, or by using the toolbar.
by clicking anywhere on the page.
by dragging the page around when zoomed in.
by clicking anywhere on the page when zoomed in.
web sites or send emails by clicking on hyperlinks.
Email this page to a friend
Search this issue
Index - jump to page or section
Archive - view past issues
Concrete In Australia : June 2014
46 Concrete in Australia Vol 40 No 2 FEATURE: FIBRE REINFORCED POLYMER Recent developments on FRP bars as internal reinforcement in concrete structures Allan Manalo, University of Southern Queensland Brahim Benmokrane, University of Sherbrooke, Quebec Ki-tae Park, Korea Institute of Construction Technology Darren Lutze, Inconmat Australia During the last two decades, fibre reinforced polymer (FRP) reinforcing bars have been extensively investigated and a number of FRP bars are now commercially available. However, the use of FRP bars as internal reinforcement in concrete structures is still unfamiliar to many practising Australian engineers. This paper provides an overview on the current research and developments on FRP bars to ensure that Australia is properly informed in the engineering research for this advanced material allowing its responsible introduction and wide use in civil infrastructure. Firstly, research and developments on the application of FRP bars as internal reinforcement in concrete beams, columns and slabs are presented. Secondly, the results of the on-going efforts on the evaluation of the potential use of FRP bars in geopolymer concrete structures are discussed. Thirdly, the concept of material hybridisation to develop a viable hybrid FRP bar for concrete structures was presented. Finally, some field applications of the GFRP bars to a number of civil infrastructures in Australia were highlighted. 1.0 INTRODUCTION Fibre reinforced polymer (FRP) composite has gained considerable worldwide interest and growing acceptance in the construction industry as internal reinforcement in concrete structures. This composite material which typically consists of strong fibres embedded within a light polymer matrix has become an attractive construction material because of its light weight, high tensile strength, non-corrosive, and nonmagnetic properties (Gangarao et al, 2007). The use of FRP bar is particularly attractive for structures that operate in highly aggressive environments near coastlines and in mining infrastructures where corrosion of steel reinforcing bar is a major problem. The corrosion of steel bars is a material problem as shown in Figure 1. As methods to try and overcome this problem, steel has been coated with galvanising and epoxy to try to extend the inevitable issue of corrosion or replaced with noncorrosive materials. Currently, many researchers are actively investigating FRP as reinforcement in concrete to enhance the durability and prolong life time over the serviceability of civil engineering structures. Research related to this advanced construction material has been carried out extensively in the US, Canada, Europe, and Japan (Bakis et al, 2002). Although the initial costs of using FRP composites are higher as compared to that of steel, they will even up in the long run since the costly Figure 1: Corrosion problems of concrete structures. 46-56 - Manalo.indd 46 46-56 - Manalo.indd 46 22/05/14 11:56 AM 22/05/14 11:56 AM