1211. Natural exposure comparison of timber joints bonded with polyurethane adhesive in two climatic conditionsMartin Capuder, Gary M. Raftery, Weixi Wang, Zubin Karami, Boris Azinović, Andreja Pondelak, Luka Naumovski, Tomaž Pazlar, 2025, published scientific conference contribution Abstract: The increased use of engineered wood in the built environment is attracting much attention because of the significant sustainable attributes. The formation of high quality reliable structural adhesive bonds is essential during the manufacture of such products. This research examines and compares the performance of bonded European beech and Radiata pine subject to natural weathering, comparing untreated, preservative treated and mineralized wood. Bonded joints were naturally weathered in Slovenia and New Zealand, respectively. The fracture energy was evaluated through Mode I fracture tests using the double cantilever beam arrangement at various ageing stages. FTIR analysis was conducted to assess chemical changes in the adhesives and wood substrate. The research provides insights into the interactions between ageing, wood species, and adhesive performance, enhancing timber structures sustainability.
Keywords: durability, weathering, climate, adhesive bond, mode I fracture testing
Published in DiRROS: 27.08.2025; Views: 399; Downloads: 169
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1214. Characterization of steel corrosion in alkali-activated mortars using advanced techniquesNina Gartner, Miha Hren, Tadeja Kosec, Andraž Legat, 2025, original scientific article Abstract: Alkali-activated materials have emerged as a promising substitute for ordinary Portland cement (OPC) in various applications. This study explores the use of different monitoring techniques for assessing the long-term corrosion behavior of steel in alkali-activated mortars, which remains relatively understudied. Three types of alkali-activated mortars (AAMs) were prepared, based on fly ash, slag, or metakaolin as the precursor material. The corrosion of embedded steel was investigated under wetting and drying cycles with chloride-containing solution for up to one year. Two unconventional techniques were used to monitor corrosion: coupled multi-electrode array sensors (CMEA) to measure partial currents, and electrical resistance (ER) sensors to track thickness reduction. The ER sensors enabled evaluation of general corrosion rates over time, while CMEA provided insight into corrosion initiation and its spatiotemporal distribution. In addition, the corrosion damage on the embedded steel and sensors was evaluated using X-ray computed microtomography (microCT). Distinct corrosion patterns were observed depending on the precursor material: severe corrosion in metakaolin-based AAMs, localized pitting in slag-based AAMs, and moderate damage in fly ash-based AAMs. The study demonstrates the complementary value of CMEA and ER sensors and highlights the challenges of characterizing the long-term corrosion processes in these alternative binder systems.
Keywords: corrosion, alkali‐activated materials, coupled multi-electrode array (CMEA), electrical resistance (ER) sensor, X-ray computed microtomography (microCT), visual analysis
Published in DiRROS: 27.08.2025; Views: 409; Downloads: 289
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1215. Shape-selective zeolites for tandem ▫$CO_2$▫ hydrogenation-carbonylation reactionsHendrik van Dessel, Sam Van Minnebruggen, Jasper Dedapper, Paul Paciok, Oleg A. Usoltsev, Andraž Krajnc, Aram L. Bugaev, Dirk de Vos, 2025, original scientific article Published in DiRROS: 27.08.2025; Views: 340; Downloads: 60
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1216. Preliminary assessment of alkali-resistant flax based meshes for reinforcing cementitious compositesJaka Gašper Pečnik, Laetitia Sarah Jennifer Marrot, Marica Mikuljan, Tania Langella, Matthew Schwarzkopf, 2025, original scientific article Abstract: The production of textile-reinforced concrete (TRC) requires less materials and energy in comparison with conventional concrete reinforced with steel rebars, which draws some solutions towards the production of net zero concrete that the Cement and Concrete Industry sector should reach by 2050. To go one step further, this study investigates the development of flax based meshes as basic components for a reinforcement grid in cementitious materials. Flax strands and hybrid strands (combination of flax strands and glass or basalt rovings) were impregnated with an epoxy resin to form meshes. The physical and mechanical properties of the flax based meshes were assessed and the alkaline resistance of these reinforcing materials was evaluated to determine their durability in a cementitious matrix. At isoweight of reinforcement, the flax-based meshes demonstrated the best performance in terms of specific modulus and specific strength compared to the hybrid meshes. The hybrid meshes from the control batch displayed specific properties in the same range, whether they were constituted of AR-glass or basalt. However, the use of alkali-resistant glass rovings strongly mitigated the degradation of the mechanical properties of the hybrids meshes by making them less affected by the alkaline environment, among all the reinforcement meshes. In contrast, hybrid meshes with basalt experienced an extensive reduction in tensile strength and strain after exposure to alkaline environment, due to the corrosion of the basalt fibres. Pull-out tests revealed maximum bond strengths for the flax based meshes embedded in a high-performance concrete matrix.
Keywords: alkali, cement, flax, reinforcement
Published in DiRROS: 27.08.2025; Views: 444; Downloads: 214
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1217. Towards harmonized reduction of seismic vulnerability : analyzing regulatory and Incentive frameworks in the Adriatic—Ionian RegionPetra Triller, Angela Santangelo, Giulia Marzani, Maja Kreslin, 2025, original scientific article Abstract: The Adriatic–Ionian region is seismically very active and poses a major challenge for risk mitigation. Each country has developed laws, standards, and techniques to reduce seismic vulnerability. The ADRISEISMIC project created a database of existing regulatory and incentive frameworks, based on a comprehensive study conducted in six countries. The study covered seismic norms, building regulations, urban planning regulations, incentive frameworks, and post-earthquake planning. A comparative matrix was developed in which key parameters, such as year of issuance, references to EU regulations, level of enforcement, mandatory status, target groups, reference period in relation to earthquake occurrence, and consideration of cultural heritage, were analyzed. The database aims to support a harmonized strategy to reduce seismic vulnerability by promoting measures based on common reference standards. This increases safety, improves the built environment, and minimizes risks to people and nature. Particular attention will be paid to historic urban areas that are both vulnerable and rich in cultural heritage. The collected regulatory and incentive framework will serve as a basis for future research to support the identification of good practices and the formulation of customized roadmaps to apply them to reduce seismic vulnerability.
Keywords: seismic vulnerability, regulatory and incentive frameworks, survey, seismic norms, building regulation, urban planning regulation, seismic incentive frameworks, post-earthquake planning, adriatic–ionian region, collection and systematization of documents
Published in DiRROS: 27.08.2025; Views: 334; Downloads: 255
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1218. Multi-scale X-ray techniques for assessing recycled concrete aggregate : from XRPD analysis of leftover cement in recycled aggregates to micro-CT imaging of concrete microstructureA. Bisciotti, Lucia Mancini, Alberto Viani, Vesna Zalar Serjun, Ana Mladenovič, Giuseppe Cruciani, 2025, original scientific article Abstract: The content of leftover cement paste is a crucial parameter for determining recycled aggregates quality. Various methods assess this, including wet techniques (acid dissolution, chemical degradation, water absorption), physical approaches (freeze-thaw cycles, mechanical shredding, oven-dried density, thermal disaggregation), and spectroscopic or microscopy analyses. However, these methods often lack accuracy, are time-consuming, or depend on operator skill. A novel X-ray Powder Diffraction and Rietveld quantitative phase analysis approach is introduced to improve measurements precision. Results are compared with multi-scale analyses (microscopy, Xray computed tomography, mechanical testing) on recycled aggregate concrete specimens. Findings highlight a strong correlation between leftover cement paste content and key concrete properties, including microstructure, hydration products, and mechanical performance. This study confirms that leftover cement paste content is a decisive factor in recycled concrete aggregate properties, and that the proposed method offers a rapid and reliable approach to control this parameter.
Keywords: recycled concrete aggregate, leftover cement paste, CDW, X-ray diffraction, microstructure
Published in DiRROS: 27.08.2025; Views: 330; Downloads: 216
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1219. Investigation of the interactions and electromagnetic shielding properties of graphene oxide/platinum nanoparticle composites prepared under low-dose gamma irradiationDejan Kepić, Miloš Milović, Dušan Sredojević, Andjela Stefanović, Brankica Gajić, James L. Mead, Blaž Nardin, Blaž Likozar, Janvit Teržan, Muhammad Yasir, Warda Saeed, Svetlana P. Jovanović, 2025, original scientific article Published in DiRROS: 27.08.2025; Views: 252; Downloads: 146
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