1. Pyrolysis oil-based polyurethane foams as a middle layer of the composite plywood sandwich panels for sustainable constructionJakub Grzybek, Jakub Michal Sandak, David Contus, Andrea Minigher, Hans Heeres, Bert van de Beld, Erfan Asgari, Rok Prislan, Anna Malgorzata Sandak, 2026, izvirni znanstveni članek Opis: The construction sector’s substantial contribution to global energy consumption and CO2 emissions motivates the development of bio-based alternatives to fossil-derived rigid polyurethane (PUR) foam cores in structural sandwich panels. This study presents a comprehensive comparison of plywood sandwich panels manufactured with a rigid PUR foam containing a fast pyrolysis bio-oil (FPBO)-derived sugar polyol diluted with triethyl phosphate and panels of identical topology produced with a commercial reference PUR foam. In the bio-based formulation, a fraction of the sorbitol-based polyether polyol was replaced with the FPBO-derived sugar polyol. Both systems were characterized at the foam and panel levels for cellular microstructure, skeletal and envelope density, thermogravimetric stability, flammability, color, thermal conductivity and heat capacity, internal bond strength, compressive properties, and normal-incidence sound absorption and transmission loss. The newly developed foam exhibited similar skeletal density and porosity to the reference, comparable thermogravimetric stability with a slightly higher char residue, and lower thermal conductivity across the tested temperature range. Mechanical properties, including compressive strength, compressive modulus, and internal bond strength, showed minor reduction but remained within a comparable range. A distinct color change was observed, attributable to the presence of chromophoric constituents of the FPBO fraction. Overall, the results indicate that partial substitution of the fossil polyol with an FPBO-derived sugar polyol is technically feasible, yielding materials with comparable thermal, mechanical, or acoustic performance. No consistent performance advantage of either system was observed across the evaluated properties. The results support the potential of pyrolysis-derived bio-polyols for use in sustainable structural insulation products.
Ključne besede: bio-based polyol, fast pyrolysis bio-oil, rigid polyurethane foams, waste valorization
Objavljeno v RUP: 14.07.2026; Ogledov: 108; Prenosov: 4
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2. A floating floor resilient layer development approach and its application to the design of a high impact sound insulation wood-based solutionRok Prislan, Andreja Kutnar, Urban Kavka, Maximilian Neusser, Daniel Svenšek, 2026, izvirni znanstveni članek Opis: Environmental considerations have become increasingly important in the construction industry, driving the search for more sustainable alternatives to conventional building materials and solutions. One resource-intensive material used for structural decoupling is the impact-resilient layer, which, when installed in floating floors, is crucial for achieving the required insulation ratings. This study presents a methodology for developing an impact-resilient layer. The approach defines the key performance parameters of a floating floor and follows an experimental development approach based on prototyping. Prototypes are iteratively improved, with the first generation providing proof of concept and evolving into a final large-scale prototype that validates the impact insulation performance. To validate the approach, it is applied to the development of a wood-based resilient layer as a case study. The introduced resilient layer is highly sustainable and follows design for disassembly principles, while technically relying on a novel elastic response mechanism based on the flexural deformation of wooden strips. Over three generations of prototypes, the design evolved systematically, considering different geometric configurations, wood species, and wood-cork composites to manufacture the strips. The experimental evaluation focused on load-bearing capacity, dynamic stiffness, and damping ratio, also accounting for the inherent variabil ity of wood and wood moisture content as experimental parameters. A viable design was achieved and showed competitive impact sound insulation compared to established reference solutions. These results demonstrate that the proposed development approach can be successfully applied in practice and that a wood-based resilient layer can be a viable alternative to conventional market solutions.
Ključne besede: impact sound, sustainable insulation, floating floor, wood moisture content
Objavljeno v RUP: 23.06.2026; Ogledov: 245; Prenosov: 10
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4. Vibration-based serviceability and acoustic assessment of timber floorsAngelo Aloisio, Dag Pasca, Thomas Hillberger, Roberto Tomasi, Thomas Reynolds, Chiara Bedon, Sven Vallely, Rok Prislan, Kemal Edip, Mohammadreza Salehi, 2025, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Opis: Timber floors are particularly susceptible to noise and vibration issues when compared to other construction methods, such as concrete floors. This is due to the relatively high stiffness-to-mass-density-ratio of timber floors, which enables so-called ‘lightweight’ floor constructions, in contrast to ‘heavyweight’ floor constructions consisting, for example, of concrete slabs and steel girders.
Ključne besede: vibrations, tall timber buildings, floors
Objavljeno v RUP: 21.10.2025; Ogledov: 742; Prenosov: 8
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6. Electric guitar neck from densified poplar? : experimental and numerical analysisVáclav Sebera, Marica Mikuljan, Michael Nicolas Mrissa, Andreja Kutnar, Rok Prislan, Jaka Gašper Pečnik, 2021, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: densified poplar, orthotropic material model, finite element analysis, electric guitar, acoustics
Objavljeno v RUP: 24.06.2021; Ogledov: 5525; Prenosov: 75
Celotno besedilo (1,75 MB)
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