Acceptance Criteria for Tensile Characterization of Fabric-Reinforced Cementitious Matrix Systems for Concrete and Masonry Repair
Publication: Journal of Composites for Construction
Volume 22, Issue 6
Abstract
Fabric-reinforced cementitious matrix (FRCM) composites are a new class of materials used to repair and strengthen existing structures. Mechanical performance varies widely based on the type and volume of fibers, fabric architecture, mortar properties, and bond characteristics. Moreover, test setup and boundary conditions are of the utmost importance for their mechanical characterization because of the complex interaction between fabric and brittle matrix. Therefore, the challenge is to define characterization and acceptance criteria that are (1) suitable for a wide spectrum of existing FRCM systems, and (2) produce representative values for the design of strengthened members. In this paper, three FRCM systems comprising carbon, glass, and steel fabrics were tested in accordance with two different acceptance methods. One method, which has been developed and adopted in the United States, is based on tensile tests on FRCM coupons with a clevis-grip mechanism that allows slippage at the fabric–matrix interface and provides mechanical properties that are directly used for design. The other method, developed within RILEM TC 250-CSM, combines the results of clamping-grip tensile tests on bare textile specimens with those of FRCM-to-substrate shear bond tests to obtain mechanical properties accounting for a broad range of possible failure modes. The results provided by the two methods are discussed and compared in relation to FRCM field applications.
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Acknowledgments
The authors gratefully acknowledge the financial support of (1) the University Transportation Center “Research on Concrete; Applications for Sustainable Transportation (RE-CAST)” under US DOT Grant No. DTRT13-G-UTC45; (2) the National Science Foundation (NSF) Industry/University Center for Integration of Composites into Infrastructure (CICI) under Grant No. NSF IIP-1439543; and (3) the Italian Ministry for Foreign Affairs (MAECI) for the Research Project “Composites with inorganic matrix for sustainable strengthening of architectural heritage” under Grant No. PGR00234, for the years 2016–2018.
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Journal of Composites for Construction
Volume 22 • Issue 6 • December 2018
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©2018 American Society of Civil Engineers.
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Received: Feb 23, 2018
Accepted: May 24, 2018
Published online: Aug 29, 2018
Published in print: Dec 1, 2018
Discussion open until: Jan 29, 2019
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