Investigation of pullout strength of pre-installed glass fibre reinforced polymer bars in high-performance concrete

Concrete Cover ◽

Bond Behaviour ◽

Gfrp Bars ◽

Reinforced Polymer ◽

Glass Fiber Reinforced ◽

Concrete Blocks ◽

Fibre Reinforced Polymer

Fibre reinforced polymer (FRP) bars are rapidly becoming an alternative to conventional steel reinforcing bars in bridge construction. This research investigated the bond behaviour of glass fiber reinforced polymer (GFRP) bars embedded in high-‐performance concrete (HPC). Sand-‐coated and ribbed-‐surface GFRP bars of 16 and 20 mm diameters were considered in this study. Concrete blocks were cast with embedded GFPR bars to conducted pullout tests to examine the effect of varying parameters on their pullout and bond strengths, namely: embedment length, bar diameter, surface treatment, and concrete cover. In addition, bond characteristic were analyzed between straight and head-‐ended sand-‐coated GFRP bars. The experimental results were used to evaluate the development lengths specified in design codes. It was determined that the development lengths for straight GFRP bars provided by the codes are conservative. Also, the development length for head-‐end bar is shorter than that for similar bar with straight end.

Bond characteristics of glass fibre reinforced polymer bars embedded in high performance and ultra-high performance concrete

10.32920/ryerson.14656974 ◽

2021 ◽

Author(s):

Dave Ametrano

Keyword(s):

High Performance ◽

Bond Behaviour ◽

Gfrp Bars ◽

Reinforced Polymer ◽

Glass Fibre Reinforced ◽

Bond Characteristics

The use of fibre reinforced polymer (FRP) bars is increasing in construction as an alternative to conventional steel rebars. This thesis investigates the bond behaviour of glass fibre reinforced polymer (GFRP) bars embedded in high performance concrete (HPC) and ultra-high performance concrete (UHPC). In this study, the bond characteristics of sand coated GFRP bars embedded in 70-175 MPa concrete were explored. Beam and pullout tests were performed to determine the effects of the concrete strength, bar diameter, embedment length, and concrete cover on the bond behaviour of GFRP bars. Based on the analysis, the development lengths for the GFRP bars were determined and then compared to requirements provided by design codes. It was concluded that the design code lengths could be reduced by 20% while still maintaining a factor of safety of two over the development lengths determined through this study. This reduction can be applied when the GFRP bar is surrounded by sufficient transverse reinforcement, such that adding additional reinforcement would not affect the bond strength. Reducing the amount of GFRP reinforcing material needed, results in a lower overall cost of construction.

Bond characteristics of glass fibre reinforced polymer bars embedded in high performance and ultra-high performance concrete

10.32920/ryerson.14656974.v1 ◽

2021 ◽

Author(s):

Dave Ametrano

Keyword(s):

High Performance ◽

Bond Behaviour ◽

Gfrp Bars ◽

Reinforced Polymer ◽

Glass Fibre Reinforced ◽

Bond Characteristics

The use of fibre reinforced polymer (FRP) bars is increasing in construction as an alternative to conventional steel rebars. This thesis investigates the bond behaviour of glass fibre reinforced polymer (GFRP) bars embedded in high performance concrete (HPC) and ultra-high performance concrete (UHPC). In this study, the bond characteristics of sand coated GFRP bars embedded in 70-175 MPa concrete were explored. Beam and pullout tests were performed to determine the effects of the concrete strength, bar diameter, embedment length, and concrete cover on the bond behaviour of GFRP bars. Based on the analysis, the development lengths for the GFRP bars were determined and then compared to requirements provided by design codes. It was concluded that the design code lengths could be reduced by 20% while still maintaining a factor of safety of two over the development lengths determined through this study. This reduction can be applied when the GFRP bar is surrounded by sufficient transverse reinforcement, such that adding additional reinforcement would not affect the bond strength. Reducing the amount of GFRP reinforcing material needed, results in a lower overall cost of construction.

Bond Strength Between Cast-in-Place Ultra-High-Performance- Concrete and Glass Fibre Reinforced Polymer Plates Using Epoxy Bonded Coarse Silica Sand

Durability of Building and Construction Sealants and Adhesives: 4th Volume ◽

10.1520/stp49511t ◽

2012 ◽

pp. 3-25

Author(s):

Donna Chen ◽

Raafat El-Hacha

Keyword(s):

Bond Strength ◽

Glass Fibre ◽

High Performance ◽

Silica Sand ◽

Reinforced Polymer ◽

Bond Strength Between Cast-in-Place Ultra-High-Performance- Concrete and Glass Fibre Reinforced Polymer Plates Using Epoxy Bonded Coarse Silica Sand

Durability of Building and Construction Sealants and Adhesives: 4th Volume ◽

10.1520/stp154520120001 ◽

2012 ◽

pp. 3-25

Author(s):

Donna Chen ◽

Raafat El-Hacha

Keyword(s):

Bond Strength ◽

Glass Fibre ◽

High Performance ◽

Silica Sand ◽

Reinforced Polymer ◽

Experimental and Theoretical Investigation of Glass Fibre Reinforced Polymer Tension Lap Splices in Ultra High Performance Concrete

10.32920/ryerson.14656203 ◽

2021 ◽

Author(s):

Chratien Mak

Keyword(s):

Glass Fibre ◽

High Performance ◽

Lap Joints ◽

Lap Splices ◽

Reinforced Polymer ◽

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

Bond Strength Between Cast-in-Place Ultra-High-Performance- Concrete and Glass Fibre Reinforced Polymer Plates Using Epoxy Bonded Coarse Silica Sand

Journal of ASTM International ◽

10.1520/jai103836 ◽

2012 ◽

Vol 9 (3) ◽

pp. 103836 ◽

Cited By ~ 1

Author(s):

Donna Chen ◽

Raafat El-Hacha

Keyword(s):

Bond Strength ◽

Glass Fibre ◽

High Performance ◽

Silica Sand ◽

Reinforced Polymer ◽

Experimental and Theoretical Investigation of Glass Fibre Reinforced Polymer Tension Lap Splices in Ultra High Performance Concrete

10.32920/ryerson.14656203.v1 ◽

2021 ◽

Author(s):

Chratien Mak

Keyword(s):

Glass Fibre ◽

High Performance ◽

Lap Joints ◽

Lap Splices ◽

Reinforced Polymer ◽

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

Design and evaluation of a wedge-type anchor for fibre reinforced polymer tendons

Canadian Journal of Civil Engineering ◽

10.1139/l00-048 ◽

2000 ◽

Vol 27 (5) ◽

pp. 985-992 ◽

Cited By ~ 17

Author(s):

T I Campbell ◽

N G Shrive ◽

K A Soudki ◽

A Al-Mayah ◽

J P Keatley ◽

...

Keyword(s):

High Performance ◽

Numerical Models ◽

Reinforced Polymer ◽

Anchorage System ◽

Load Tests ◽

Tendon Tension ◽

Post Tensioning

The development of a wedge-type anchorage system for fibre reinforced polymer (FRP) tendons, as part of an overall corrosion-free post-tensioning system, is outlined in this paper. A stainless steel anchor is described, and results from numerical models and load tests to evaluate its behaviour under loads from anchor set, as well as static and repeated tendon tension, are presented. An alternative wedge-type anchorage system made from ultra-high performance concrete is also described. It is shown that, although significant progress has been made in development of the anchorage, further work is required to make it more robust.Key words: FRP tendons, post-tensioning, anchorage, corrosion-free, mathematical models, load tests, concrete.