Impregnated Carbon Fabric–Reinforced Cementitious Matrix Composite for Rehabilitation of the Finale Emilia Hospital Roofs: Case Study
Publication: Journal of Composites for Construction
Volume 21, Issue 4
Abstract
In this paper, the mechanical performance of concrete beams strengthened by an impregnated carbon fabric–reinforced cementitious matrix (CFRCM) composite is investigated. The study is aimed at the rehabilitation of the Finale Emilia hospital roofs, which were severely damaged by the 2012 northern Italy earthquake. An 8-m-long concrete beam was taken from the building for reinforcement and testing in a beam test setup. The composite is designed to be externally applied to the existing thin clay tile layer bonded to the concrete beam intrados. Two lamination cycles, which differ by the way in which the partially organic adhesion promoter is applied to the fabric, are considered. It was found that impregnation through fabric immersion provides a 1.5-fold increase in the ultimate strength of the strengthened beam compared to expedited impregnation with a brush and that clay tiles make a very good supporting substrate, to the extent that cohesive fracture at the tile–concrete interface takes place on the verge of concrete failure near the hinge zone. Conversely, expedited impregnation of the carbon fabric with the adhesion promoter was unable to provide adequate fabric–matrix adhesion and led to delamination failure. Estimates of the adhesion strength, optimal bonded length, and of the composite, as well as of the concrete strain at failure, are provided.
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Acknowledgments
This study was conducted in collaboration with Ardea Progetti e Sistemi Srl, Bologna, Italy, and with Studio Melegari, Parma, Italy. Financial support from the Fondazione Cassa di Risparmio di Modena, Pratica Sime nr. 2013.0662, is gratefully acknowledged.
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Published In
Journal of Composites for Construction
Volume 21 • Issue 4 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 6, 2016
Accepted: Oct 5, 2016
Published online: Feb 6, 2017
Discussion open until: Jul 6, 2017
Published in print: Aug 1, 2017
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