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Co-extruded polymer fibers for concrete reinforcement

  • Corrosion of steel reinforcements in concrete constructions is a big topic for the building industry. Polymeric materials are a possible alternative due to their ability to withstand corrosion. To replace steel reinforcements, fibers with high mechanical properties and a good bonding ability between fiber and concrete are needed. Today different approaches for concrete reinforcement by polymer fibers have been investigated. The bonding ability of the fibers can be increased by mechanical anchoring, e.g. crimped or embossed fibers, as well as by a chemical bonding between concrete and fiber surface. To realize the requirements of high mechanical properties and a good bonding behavior, a fiber that is drawn from a co-extruded filament shall be produced and tested. The filament owns an innovative core-shell-structure. The core maintains the fiber-stiffness and the tensile strength while the shell allows using another material to affect the bonding behavior of the fiber. This study shows the usage of fibers with differing shell materials to examine their influence on the mechanical properties of the fiber in total and the adhesion abilities to concrete. As core material, an unfilled polypropylene (PP) is used. The shell materials are varied using different polymers e.g. polypropylene or ethylene acrylic acid copolymer, as well as two PP based compounds filled with wood particles and calcium carbonate blended with a maleic anhydride based coupling agent. The mechanical properties of the fibers are tested by fiber tensile tests to compare the younǵs modulus and the tensile strength. The influence of the shell phase on the bonding ability to concrete is evaluated by the interfacial shear strength calculated from single fiber pull-out tests. Microscopy is used to interpret changes before and after pull-out. The results depict incredible positive effects and allow new insights in possible materials for fiber reinforced concrete constructions.

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Metadaten
Author:Jonas Herz, Michael Sigrüner, Dirk Muscat, Nicole Strübbe
DOI:https://doi.org/10.1063/5.0168511
Parent Title (English):Proceedings of the 37th International Conference of the Polymer Processing Society (PPS-37)
Document Type:Conference Proceeding
Language:English
Publication Year:2023
Tag:coextrusion; concrete reinforcement; core shell fiber; polymer fibers
Volume:2884
Issue:1
Peer reviewed:Ja
Funding Agency:Bundesministerium für Ernährung und Landwirtschaft
Grant Number:2220HV022A
faculties / departments:Fakultät für Ingenieurwissenschaften
Zentrum für Forschung, Entwicklung und Transfer