@techreport{BenekenDihFriedetal.2018, author = {Beneken, Gerd and Dih, Denise and Fried, Adrian and Hauch, Julia and Hummel, Sabine and Junker, Elmar and Karlinger, Peter and K{\"o}ster, Heinrich and Krause, Harald and Muscat, Dirk and Niedermaier, Peter and Sch{\"a}fle, Claudia and Schutter, Sabina and Sigr{\"u}ner, Michael and Stanzel, Silke and Str{\"u}bbe, Nicole and Werndl, Peter and Wirnsberger, Markus and Zentgraf, Peter}, title = {Jahresbericht 2018, Forschung - Entwicklung - Innovation}, organization = {Technische Hochschule Rosenheim}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:861-opus4-12374}, pages = {68}, year = {2018}, abstract = {Mit dem j{\"a}hrlich erscheinenden Forschungsbericht m{\"o}chte die Technische Hochschule Rosenheim einen Einblick in ihre vielf{\"a}ltigen Projekte und Aktivit{\"a}ten der angewandten Forschung und Entwicklung geben. Im Jahresbericht 2018 wird {\"u}ber Vorhaben im Jahr 2018 berichtet.}, language = {de} } @inproceedings{HerzSigruenerMuscatetal.2023, author = {Herz, Jonas and Sigr{\"u}ner, Michael and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Co-extruded polymer fibers for concrete reinforcement}, series = {Proceedings of the 37th International Conference of the Polymer Processing Society (PPS-37)}, volume = {2884}, booktitle = {Proceedings of the 37th International Conference of the Polymer Processing Society (PPS-37)}, number = {1}, doi = {10.1063/5.0168511}, year = {2023}, abstract = {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.}, language = {en} } @article{HerzMuscatStruebbe2025, author = {Herz, Jonas and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {The Influence of Fillers on the Reinforcement Capabilities of Polypropylene Based Mono-Material and Core-Shell Fibers in Concrete, a Comparison}, series = {Polymers}, volume = {17}, journal = {Polymers}, number = {13}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/polym17131781}, pages = {24}, year = {2025}, abstract = {Noncorrosive concrete reinforcement, such as polymer fibers, is needed to overcome the current issues caused by corroded steel reinforcements. Fibers made of polypropylene show a low bonding behavior in concrete. Fillers can help to overcome this issue but often lead to reduced mechanical properties. Core-shell fibers, which split the mechanical properties and the bonding behavior between the core and the shell component, could be a solution. This study investigates mono-material and core-shell fibers produced with calcium carbonate and bentonite fillers and compares their behavior in tensile tests, density measurements, contact angle measurements, topography measurements, single fiber pull-out tests, reflected light microscopy, and thermogravimetric analysis. The fillers caused an increased drawability, resulting in higher mechanical properties. Further, in the core-shell fibers, the calcium carbonate increased the surface roughness, which led to a better anchoring of the fiber in concrete, which was also visible in the deformation during pull-out observed in reflected light microscopy pictures. The thermogravimetric analysis showed a delay in onset of degradation for fibers containing bentonite.}, language = {en} } @misc{StruebbeMuscatZenz2023, author = {Str{\"u}bbe, Nicole and Muscat, Dirk and Zenz, Vitus}, title = {DEVICE FOR THE PRODUCTION OF BIOPOLYMERS FROM BIOMASS (EP4130532A1)}, editor = {European Patent Office,}, year = {2023}, abstract = {Pressure lock (10), extruding apparatus (50) for high pressure extrusion, process for producing biopolymers from biomass and use of the extruding apparatus for a process for producing biopolymers from biomass allowing continuous operation of a high pressure process.}, language = {en} } @techreport{HerzKazmiStruebbeetal.2022, author = {Herz, Jonas and Kazmi, Monis and Str{\"u}bbe, Nicole and Muscat, Dirk and Schuster, Jens and Hunger, Martin and Lanyi, Franz J.}, title = {Holz-Kunststoff-Hybrid-Gewebe/Gelege - Grundlagenuntersuchung zur Entwicklung eines innovativen Holz-Kunststoff-Hybrid-Gewebes/Geleges f{\"u}r den Ersatz von Stahlbewehrungen im Bau (Machbarkeitsstudie) : Schlussbericht zum Verbundvorhaben : Laufzeit: 01.06.2020 bis 28.02.2022}, doi = {10.2314/KXP:1860061346}, year = {2022}, language = {de} } @inproceedings{SigruenerMuscatStruebbe2021, author = {Sigr{\"u}ner, Michael and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Influencing the bonding ability of polypropylene fibers to concrete by blend hydrophilization and reactive functionalization}, series = {IUPAC MACRO2020+, 48th World Polymer Congress, 16. - 21. May 2021}, booktitle = {IUPAC MACRO2020+, 48th World Polymer Congress, 16. - 21. May 2021}, year = {2021}, language = {en} } @article{RuethingHaupertSchmitzetal.2022, author = {R{\"u}thing, Justus and Haupert, Frank and Schmitz, Regine and Sigr{\"u}ner, Michael and Str{\"u}bbe, Nicole}, title = {A new approach for the friction and wear characterisation of polymer fibres under dry, mixed and hydrodynamic sliding}, series = {Tribologie und Schmierungstechnik}, volume = {69}, journal = {Tribologie und Schmierungstechnik}, number = {Sonderausgabe 2}, pages = {18 -- 25}, year = {2022}, abstract = {A new approach for the friction and wear characterisation of polymer fibres under dry, mixed, and hydrodynamic sliding conditions is developed. The production process of the tested polymer fibres is described and an introduction in fibre-reinforced concrete is given. Tribotesting is done on an optimised tribometer capable of measuring the friction and wear behaviour of polymer fibres with diameters of a few 100 µm under lubricated conditions. Three extruded polypropylene macro fibres with varying diameters are characterised under tribological conditions found in an industrial concrete mixing process. It is shown that detailed friction and wear data of polymer fibres can be gathered.}, language = {en} } @misc{HerzHefenbrockLorenzetal.2024, author = {Herz, Jonas and Hefenbrock, Sophia and Lorenz, Katharina and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Polyketone-Polypropylene Core-Shell Fibers for Concrete Reinforcement}, series = {Proceedings of the 39th International Conference of the Polymer Processing Society (PPS-39)}, journal = {Proceedings of the 39th International Conference of the Polymer Processing Society (PPS-39)}, editor = {Ediciones Uniandes,}, doi = {10.51573/Andes.PPS39.GS.FF.1}, pages = {167 -- 177}, year = {2024}, abstract = {Corrosion of the commonly used steel reinforcements weakens the structural strength of concrete. To oppose this issue, concrete reinforcements in the form of polymer fibers are investigated. These polymer fibers need a good bonding ability to concrete and good mechanical properties. This study investigates core-shell fibers produced from polyketone and polypropylene mixed with a compatibilizer. The core-shell fibers were produced by coextrusion and drawing. The fibers were analyzed by tensile tests, a single fiber pull-out test, contact angle measurements, scanning electron microscopy and thermogravimetric analysis.}, language = {en} } @article{SchmitzHaupertRuethingetal.2021, author = {Schmitz, Regine and Haupert, Frank and R{\"u}thing, Justus and Sigr{\"u}ner, Michael and Str{\"u}bbe, Nicole}, title = {Tribologische Charakterisierung von Polymerfasern unter Trockenreibung, Mischreibung und Hydrodynamik mittels einer optimierten Pin-on-Disc-Pr{\"u}fmethode}, series = {Tribologie und Schmierungstechnik}, volume = {68}, journal = {Tribologie und Schmierungstechnik}, number = {3-4}, pages = {13 -- 21}, year = {2021}, abstract = {Ausgehend von der herk{\"o}mmlichen Pin-on-Disc-Pr{\"u}fmethodik wurde ein Tribologiepr{\"u}fstand hinsichtlich seiner Leistungsf{\"a}higkeit zur Fasercharakterisierung optimiert und angepasst. Die Methodik wird erl{\"a}utert und erste Anwendungen im Bereich der tribologischen Charakterisierung von Einzelfasern werden vorgestellt. Der Pr{\"u}fungsablauf zur Untersuchung der Polymerfasern, deren Durchmesser nur einige 100 µm betragen, ist so generiert, dass eine Erfassung der Daten als Funktion der Zeit im Bereich von einigen 10 µm bis zu einigen 100 µm Faserverschleiß kontinuierlich w{\"a}hrend der Messung bereits in den ersten Minuten erfolgen kann. Der Pr{\"u}fmodus startet hierbei mit Linienlast und entwickelt sich dynamisch zur Fl{\"a}chenlast durch {\"A}nderung der Auflagefl{\"a}che der Faser w{\"a}hrend der Messung. Es wird gezeigt, dass Einzelfasern hinsichtlich ihrer Reibungs- und Verschleißeigenschaften in unterschiedlichen tribologischen Systemen charakterisiert werden k{\"o}nnen. Die Abh{\"a}ngigkeit der Verschleißraten von Fasermaterial, Oberfl{\"a}chenrauheit der Gegenk{\"o}rper und Schmiermittelraten wird dargestellt.}, language = {de} } @article{SigruenerMuscatStruebbe2021, author = {Sigr{\"u}ner, Michael and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Investigation on pull-out behavior and interface critical parameters of polymer fibers embedded in concrete and their correlation with particular fiber properties}, series = {Journal of Applied Polymer Science}, volume = {138}, journal = {Journal of Applied Polymer Science}, number = {28}, pages = {50745}, year = {2021}, abstract = {A crucial problem in concrete engineering is the corrosion of steel reinforcements. Polymer fibers as alternative reinforcement material can prevent corrosion; however, high adhesion to concrete and good fiber mechanics are necessary for polymers to be considered as an alternative reinforcement. This study tested different thermoplastic polymer materials to evaluate their level of adhesion to concrete. The adhesion properties of different self-drawn polymer fibers were analyzed by extracting the fibers from concrete using single fiber pull-out test (SFPT). To determine the adhesion mechanism, different polymer properties were analyzed and correlated to SFPT. Strong evidence was found that the fibers mechanical properties correlate with SFPT. Roughening the fiber surface increases the SFPT results significantly. While highly polar materials can support the adhesion process, a clear correlation could not be found. This study identifies high stiffness and roughness as the crucial properties of polymer fibers used in concrete engineering. If these factors can be engineered into the fiber, polymer fibers can present an alternative to steel in concrete reinforcement.}, language = {en} } @inproceedings{SigruenerMuscatStruebbe2020, author = {Sigr{\"u}ner, Michael and Muscat, Dirk and Str{\"u}bbe, Nicole}, title = {Investigation of the Bonding Behavior of Modified Polypropylene to a Concrete Matrix by Single Fiber Pull Out Tests}, series = {SAMPE Europe Conference Proceedings 2020}, booktitle = {SAMPE Europe Conference Proceedings 2020}, year = {2020}, language = {en} }