Abstract

Glass fibre reinforced polymer (GFRP) reinforcements are a viable replacement for corroding steel rebars. GFRP rebar tension lap splices combined with ultra high performance concrete (UHPC) can improve the efficiency of materials and construction in bridge deck construction joints. This thesis investigates the bond performance of high modulus (HM) GFRP rebar splices using UHPC. UHPC slab/beams of 100 -170 MPa concrete having 150 - 300 mm tension splices were tested along with several beams constructed from prefabricated high strength concrete sections with central GFRP spliced UHPC joints. Theoretical analysis was also conducted to evaluate critical splice lengths. Based on comparisons with code design values, recommendations are made on potential failure modes and minimum splice lengths. The serviceability, fatigue, and environmental performance of GFRP in UHPC are also considered. Recommendations from this research will improve the safety and efficiency of GFRP tension lap joints used in bridge decks and other construction

Highlights

  • 1.1 General OverviewGlass fibre reinforced polymer (GFRP) rebars are increasingly being used as a replacement for conventional steel reinforcement

  • 1.2 Problem Statement The purpose of this study is to examine the structural, serviceability and durability characteristics of high modulus (HM) GFRP in reduced tension lap splices embedded in ultra high performance concrete (UHPC) by means of experimental testing and theoretical predictions

  • The main objective of this research is to determine the behaviour of reduced GFRP tensile lap splices embedded in UHPC based on these criteria:

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Summary

Introduction

1.1 General OverviewGlass fibre reinforced polymer (GFRP) rebars are increasingly being used as a replacement for conventional steel reinforcement. A total of ten tensile lap spliced GFRP reinforced concrete slab/beams were tested in addition to nine pullout specimens for bond tests that were subjected to environmental loading under freeze/thaw treatments. To establish an understanding of the behaviour of sand coated GFRP tensile lap spliced beams in UHPC the results will first be analyzed based on the ultimate capacity and bond behaviour of each slab/beam This will provide information on the effect of various splice lengths and concrete types on the bond strength of splices. The strain readings will provide some additional insight on the effects of each parameter Following this comparison the load deflection behaviour of each slab/beam will be presented for the various concrete types to see any differences in stiffness and ductility for the spliced slab/beams.

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