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Feasibility of Using Powder Actuated Fasteners in Carbon Nanofibre Ultra-High Performance Fibre Reinforced Concrete
Powder actuated fasteners (PAFs) are recognized as a safe and cost-effective fastening technique of non-structural elements to masonry, steel, and concrete. A novel flexural post-tensioning technique uses PAFs to anchor iron shape memory alloy (Fe-SMA) strips to strengthen reinforced concrete (RC) structures. The technique is being explored for strengthening ultra-high performance fibre reinforced beams (UHPFRC). However, there is no data on the fastening performance of UHPFRC. The objective of this experiment was to investigate the feasibility of using PAFs to anchor an Fe-SMA strip to UHPFRC beams by comparing the pull-out strength to a reference study with conventional concrete. The capacity of various anchorage configurations was evaluated with thirteen specimens. The key variables were the number of fasteners, fastening spacing, and length. Tension was applied using a hydraulic pulling system until anchor failure. Four, six, and eight-fastener configurations (22 mm long) with 50 mm spacing resisted a pull-out load of 35kN, 130kN, and 144kN, respectively, which exceeds results from the reference study that used 45-mm-long fasteners. In addition, more cost savings are possible as no pre-drilling was required in this investigation. Group effects were observed at a fastener spacing of 25 mm. However, the results varied significantly and the UHPFRC blocks rotated during testing, so the load-slip could not be reported. As the popularity of UHPFRC increases, having fastening performance data for PAFS will enable its advantages to be exploited. From this investigation, PAFs could be a suitable candidate. More tests for repeatability and increased confidence are recommended, and new applications are proposed.
Feasibility of Using Powder Actuated Fasteners in Carbon Nanofibre Ultra-High Performance Fibre Reinforced Concrete
Powder actuated fasteners (PAFs) are recognized as a safe and cost-effective fastening technique of non-structural elements to masonry, steel, and concrete. A novel flexural post-tensioning technique uses PAFs to anchor iron shape memory alloy (Fe-SMA) strips to strengthen reinforced concrete (RC) structures. The technique is being explored for strengthening ultra-high performance fibre reinforced beams (UHPFRC). However, there is no data on the fastening performance of UHPFRC. The objective of this experiment was to investigate the feasibility of using PAFs to anchor an Fe-SMA strip to UHPFRC beams by comparing the pull-out strength to a reference study with conventional concrete. The capacity of various anchorage configurations was evaluated with thirteen specimens. The key variables were the number of fasteners, fastening spacing, and length. Tension was applied using a hydraulic pulling system until anchor failure. Four, six, and eight-fastener configurations (22 mm long) with 50 mm spacing resisted a pull-out load of 35kN, 130kN, and 144kN, respectively, which exceeds results from the reference study that used 45-mm-long fasteners. In addition, more cost savings are possible as no pre-drilling was required in this investigation. Group effects were observed at a fastener spacing of 25 mm. However, the results varied significantly and the UHPFRC blocks rotated during testing, so the load-slip could not be reported. As the popularity of UHPFRC increases, having fastening performance data for PAFS will enable its advantages to be exploited. From this investigation, PAFs could be a suitable candidate. More tests for repeatability and increased confidence are recommended, and new applications are proposed.
Feasibility of Using Powder Actuated Fasteners in Carbon Nanofibre Ultra-High Performance Fibre Reinforced Concrete
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Forrest, B. T. (author) / El-Hacha, R. (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 27 ; 397-411
2023-08-06
15 pages
Article/Chapter (Book)
Electronic Resource
English
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