Project 2.7: High Performance Concrete with Post-Tensioning Shrinking Fibers

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Project 2.7: High Performance Concrete with Post-Tensioning Shrinking Fibers

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Project Abstract:

This research improves upon the technique of reinforcing concrete with dispersed fibers by having the fibers axially shrink after curing to produce a dispersed multi-axial post-tensioned state. Such reinforcing has the potential to increase the crack resistance and durability of the concrete. Preliminary benchtop testing with natural chitosan polymer fibers have confirmed the viability of the technique, where certain configurations show significant strengthening with the shrinking fibers. The proposed research would expand the knowledge base by examining larger scale chitosan samples, exploring steel and nitinol shape memory fibers that produce a similar effect, studying the underlying mechanical principles and exploring direct applicability to transportation structures.

Principal Investigator:
Dr. Dryver Huston

Institution:
University of Vermont

Project Type:
Base-Funded Research

Start Date:
1/1/2019

Project Cost:
$347,274

Project Status:
In Progress

End Date:
05/30/2023

Agency ID:
69A3551847101

Sponsors:
University Transportation Centers Program, Department of Transportation
University of Vermont

Implementation of Research Outcomes:
Laboratory tests indicate that chitosan-based active shrinking fibers may have the potential to extend durability of concrete by altering microstructure, for applications, such as freeze-thaw durability. soluble polymer slugs can pretension the concrete and provide some performance enhancement.