Properties of Nanomodified Fiber-Reinforced Cementitious Composites
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 10
Abstract
This paper presents the development of nanomodified fiber-reinforced cementitious composite (FRCC) mixtures. A total of seven mixtures were prepared using general use cement and a constant dosage of slag (40% replacement by mass of the base binder). Also, nanosilica was incorporated in six mixtures at a dosage of 6% by mass of the base binder, whereas one mixture was without nanosilica as a reference. Basalt fiber (BF) pellets (made of basalt fibers encapsulated by polyamide resin) were used to produce BFRCC. Three mixtures had BF pellets with different lengths (25 mm, 36 mm, or both), whereas two mixtures incorporated BF pellets and polypropylene fibers. The performance of the cementitious composites was evaluated in terms of compressive and flexural strengths and toughness. In addition, the bond strength of glass fiber-reinforced polymer (GFRP) bars embedded in either the cementitious composites or normal-strength concrete was determined. Test results revealed that adding 2.5% by volume of 36-mm-long BF pellets to the mixture achieved the best performance. This BFRCC favorably showed high residual flexural strength and ductility compared to those of other mixtures. Furthermore, it achieved better bond strength to GFRP bars compared to both the nanomodified mixture without fibers and normal strength concrete.
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Acknowledgments
The authors highly appreciate the financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC and University of Manitoba Graduate Fellowship). In-kind support by Sudaglass Fiber Technology, Inc. is much appreciated. The new IKO Construction Materials Testing Facility and the Heavy Structures Laboratory at the University of Manitoba in which these experiments were conducted has been instrumental to this research.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 10 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Feb 1, 2017
Accepted: Apr 13, 2017
Published online: Jul 6, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 6, 2017
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