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A platform for research: civil engineering, architecture and urbanism
Repair of Damaged Reinforced Concrete Pipes with Layered Sandwich Fibre Composites
Trenchless pipe repair can offer time and cost savings over traditional excavation and replacement of damaged pipes. Conventional repair methods using prefabricated steel liners are not effective due to significant loss of discharge capacity, especially for non-circular cross-sections. The objective of this paper is to introduce a novel layered sandwich system composed of fibre-reinforced polymer (FRP) composites. Concrete pipes with a length of 0.5 m and inner diameter of 380 mm are stressed to simulate damage; cracks at the crown and invert are produced by loading via the three-edge-bearing test setup (ASTM C497). The damaged pipes are repaired with multiple layers of FRPs sandwiching a layer of a syntactic foam core. The sandwich system will save FRP materials and provides the required stiffness based on the mechanics of sandwich composites. The sandwich system is applied with epoxy resin to the entire length of the inner diameter of the pipes. The repaired specimens are then loaded to failure via the three-edge-bearing test. Normalised loads and strains are analysed to compare performance between the repaired specimens and a control group. Initial results show hybrid sandwich structures composed of GFRP (Glass Fibre Reinforced Polymer), syntactic foam and CFRP (Carbon Fibre Reinforced Polymer) outperforming GFRP liners, and GFRP sandwich liners.
Repair of Damaged Reinforced Concrete Pipes with Layered Sandwich Fibre Composites
Trenchless pipe repair can offer time and cost savings over traditional excavation and replacement of damaged pipes. Conventional repair methods using prefabricated steel liners are not effective due to significant loss of discharge capacity, especially for non-circular cross-sections. The objective of this paper is to introduce a novel layered sandwich system composed of fibre-reinforced polymer (FRP) composites. Concrete pipes with a length of 0.5 m and inner diameter of 380 mm are stressed to simulate damage; cracks at the crown and invert are produced by loading via the three-edge-bearing test setup (ASTM C497). The damaged pipes are repaired with multiple layers of FRPs sandwiching a layer of a syntactic foam core. The sandwich system will save FRP materials and provides the required stiffness based on the mechanics of sandwich composites. The sandwich system is applied with epoxy resin to the entire length of the inner diameter of the pipes. The repaired specimens are then loaded to failure via the three-edge-bearing test. Normalised loads and strains are analysed to compare performance between the repaired specimens and a control group. Initial results show hybrid sandwich structures composed of GFRP (Glass Fibre Reinforced Polymer), syntactic foam and CFRP (Carbon Fibre Reinforced Polymer) outperforming GFRP liners, and GFRP sandwich liners.
Repair of Damaged Reinforced Concrete Pipes with Layered Sandwich Fibre Composites
Lecture Notes in Civil Engineering
Benmokrane, Brahim (editor) / Mohamed, Khaled (editor) / Farghaly, Ahmed (editor) / Mohamed, Hamdy (editor) / Goill, Thomas (author) / Sadeghian, Pedram (author)
8th International Conference on Advanced Composite Materials in Bridges and Structures ; Chapter: 18 ; 155-162
2022-09-27
8 pages
Article/Chapter (Book)
Electronic Resource
English
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