Deterioration of concrete barrier walls due to steel corrosion is a considerable concern since the repair or replacement has proved costly. While GFRP-reinforced barrier design was developed, crash-tested, and implemented in Ontario and Quebec in 2011 and 2018, respectively, and the Canadian Highway Bridge Design Code in 2019, bridge owners want to keep the stainless-steel bars as an option in bridge barrier design to increase competition among suppliers. In this research, stainless steel mesh was considered to reinforce the barrier wall on the traffic side, with no reinforcing bars at the back face of the barrier wall. In lieu of the back reinforcing bars, synthetic marco fibers were added to the concrete mix. These fibers have been proven to be a crack arrester, eliminate most micro-cracks, and prevent plastic shrinkage. The proposed structural fiber content to be added to the concrete is expected to provide post-cracking tensile capacity, low shrinkage, good thermal expansion, substantial modulus of elasticity, high tensile strength, and improved impact resistance. Based on an earlier study, a 1% synthetic fiber was added to the concrete mix before casting. Two full-scale, 7 m long, TL-5 barrier-deck slab specimens were constructed and tested to collapse under transverse static loading over a 2.4 m length near its top surface. The first barrier was the available TL-5 type with 225 mm top thickness and reinforced with front and back stainless steel bars. The second barrier is the proposed fiber-reinforced concrete (FRC) barrier with 180 mm top thickness with only one layer of stainless steel bars at the traffic side. Results show an acceptable performance of the FRC barriers with consideration of the Canadian Highway Bridge Design Code criteria under static loading.

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Development of Synthetic Fiber-Reinforced Concrete (FRC) Bridge Barrier with Stainless Steel Mesh at the Traffic Side

  • Morteza Fadaee,
  • Khaled Sennah

摘要

Deterioration of concrete barrier walls due to steel corrosion is a considerable concern since the repair or replacement has proved costly. While GFRP-reinforced barrier design was developed, crash-tested, and implemented in Ontario and Quebec in 2011 and 2018, respectively, and the Canadian Highway Bridge Design Code in 2019, bridge owners want to keep the stainless-steel bars as an option in bridge barrier design to increase competition among suppliers. In this research, stainless steel mesh was considered to reinforce the barrier wall on the traffic side, with no reinforcing bars at the back face of the barrier wall. In lieu of the back reinforcing bars, synthetic marco fibers were added to the concrete mix. These fibers have been proven to be a crack arrester, eliminate most micro-cracks, and prevent plastic shrinkage. The proposed structural fiber content to be added to the concrete is expected to provide post-cracking tensile capacity, low shrinkage, good thermal expansion, substantial modulus of elasticity, high tensile strength, and improved impact resistance. Based on an earlier study, a 1% synthetic fiber was added to the concrete mix before casting. Two full-scale, 7 m long, TL-5 barrier-deck slab specimens were constructed and tested to collapse under transverse static loading over a 2.4 m length near its top surface. The first barrier was the available TL-5 type with 225 mm top thickness and reinforced with front and back stainless steel bars. The second barrier is the proposed fiber-reinforced concrete (FRC) barrier with 180 mm top thickness with only one layer of stainless steel bars at the traffic side. Results show an acceptable performance of the FRC barriers with consideration of the Canadian Highway Bridge Design Code criteria under static loading.