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REPAIR OF DAMAGED CONCRETE BEAMS USING HYBRID COMPOSITE MATERIALS
Oral Presentation
Volume Title: 3rd International Conference on Civil Engineering: Development & Sustainability
Authors
1Department of Civil Engineering, Research Unit: Materials, Process and Environment, University M’Hamed Bougara of Boumerdes. Algeria
2Department of Civil Engineering, Research Unit: Materials, Process and Environment, University M’Hamed Bougara of Boumerdes. Algeria
Abstract
This work presents an experimental study of the bending behavior of pre-cracked reinforced concrete beams then repaired by means of different combinations of externally bonded hybrid composites materials: Carbon and Glass fabric reinforced polymer composite (CFRP and GFRP)
In total, twelve (12) identical dimensions beams of section (10x15) cm² and a length of 60cm were manufactured. Three (03) reference beams were loaded to failure without being pre-cracked or repaired, and were compared to nine (09) pre-cracked beams and repaired by composite materials bonded to the concrete surface with three geometric configurations.
The objective of this study was to investigate the effectiveness of FRPs composite materials and to evaluate their hybrid effect in the repair of damaged concrete beams in order to improve their bending behavior and obtain a typical repair geometric configuration.
The obtained results in this experimental study show the interest of using FRP composite materials in the repair of damaged beams. The pre-cracked beams repaired using PRFs, present a better flexional behavior compared to those of the undamaged reference beams, and this whatever the repair geometrical configuration. Repairing beams with FRPs delayed the appearance and propagation of the first cracks.
The pre-cracked beams repaired with hybrid composites materials (CFRP strips glued on the lower face and inclined GFRP strips glued on the sides) have a remarkable gain in the breaking load and a reduction in the deflection at break, in the order of 56% and 42%, respectively, which proved the efficiency of concrete repair by hybrid composites materials.
In total, twelve (12) identical dimensions beams of section (10x15) cm² and a length of 60cm were manufactured. Three (03) reference beams were loaded to failure without being pre-cracked or repaired, and were compared to nine (09) pre-cracked beams and repaired by composite materials bonded to the concrete surface with three geometric configurations.
The objective of this study was to investigate the effectiveness of FRPs composite materials and to evaluate their hybrid effect in the repair of damaged concrete beams in order to improve their bending behavior and obtain a typical repair geometric configuration.
The obtained results in this experimental study show the interest of using FRP composite materials in the repair of damaged beams. The pre-cracked beams repaired using PRFs, present a better flexional behavior compared to those of the undamaged reference beams, and this whatever the repair geometrical configuration. Repairing beams with FRPs delayed the appearance and propagation of the first cracks.
The pre-cracked beams repaired with hybrid composites materials (CFRP strips glued on the lower face and inclined GFRP strips glued on the sides) have a remarkable gain in the breaking load and a reduction in the deflection at break, in the order of 56% and 42%, respectively, which proved the efficiency of concrete repair by hybrid composites materials.
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