Nanomodified Cementitious Composites Incorporating Basalt Fiber Pellets under Tensile and Impact Loads
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 10
Abstract
This study investigated the behavior of nanomodified cementitious composites reinforced with innovative basalt fiber pellets (BFP), with specially tailored surface texture under quasi-static (direct) tensile as well as static and dynamic compression (split Hopkinson pressure bar) loading schemes. The composites comprised two different binder formulations (50% fly ash or slag replacement) with/without nanosilica modification. Thermogravimetric and microscopy studies were conducted to evaluate the hydration development and microstructure of the binders. Moreover, the pellet/matrix interfacial bond properties were assessed using the single pellet pullout test. The results showed the efficacy of BFP in reinforcing the cementitious composites and highlighted the role of nanosilica at enhancing the postcracking performance of high-volume fly ash– and slag-based mixtures under all loading schemes. Furthermore, the increase of the pellets’ dosage improved the ductility of composites in terms of energy absorption capacity and strain at failure. The pellet/matrix interface, which is responsible for the main toughening mechanism of the composites by pullout, was sensitive to the type of binder and imposed displacement rate.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (raw data of the direct tension test, impact compression test, and calcium hydroxide contents in the mixtures).
Acknowledgments
The authors appreciate the financial support from the Natural Sciences and Engineering Research Council of Canada (NSERC RGPIN/4024-2020) and University of Manitoba Research Grants Program (URGP 2019/2020). In-kind support by Sudaglass Fiber Technology is much appreciated. The IKO Construction Materials Testing Facility at the University of Manitoba in which these experiments were conducted has been instrumental to this research.
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© 2021 American Society of Civil Engineers.
History
Received: Sep 28, 2020
Accepted: Mar 1, 2021
Published online: Jul 20, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 20, 2021
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