Effect of Cyclic Loading Frequency on the Behavior of a Stabilized Sand Reinforced with Polypropylene and Sisal Fibers
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VIEW THE REPLYPublication: Journal of Materials in Civil Engineering
Volume 34, Issue 1
Abstract
When any material is subjected to dynamic loads, the evaluation of the repercussions of the cyclic loading on the mechanical properties is essential to understand its behavior better. Thus, based on the results of unconfined compression strength tests carried out with and without the application of cyclic loading, this work analyzes the effect of the frequency of the cyclic stage on the behavior of a stabilized sandy soil, unreinforced and reinforced with polypropylene and sisal fibers. The inclusion of fibers induces a decrease in the accumulated permanent axial strain obtained at the cyclic stage; this reduction is more significant for a frequency of 1.0–2.0 Hz and for the use of sisal fibers, due to the greater roughness and higher mechanical properties of this type of fiber. The cyclic stage induces an increase in stiffness for all frequencies studied. In terms of the unconfined compressive strength, the frequency has a low impact on unreinforced material, contrary to the effect on reinforced material, which induces a decrease in strength for a frequency of 1.0 Hz and an increase in strength for frequencies of 2.0 and 4.0 Hz for both types of fibers. Reinforcement with sisal fibers is more effective than the use of polypropylene fibers in terms of the improved unconfined compressive strength and stiffness of the specimens submitted or not to cyclic loading.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors would like to express their thanks to CIMPOR, Biu International, and Cotesi for supplying the binders and the fibers and to the institutions that financially supported the research: CIEPQPF (Pest/C/EQB/UI0102/2013), FCT (POCI-01-0145-FEDER-028382), and the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UIDB/04029/2020.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Dec 16, 2020
Accepted: May 5, 2021
Published online: Oct 19, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 19, 2022
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