41. Residual compressive behavior of self-compacting concrete after high temperature exposure - influence of binder materialsMarija Jelčić Rukavina, Ivan Gabrijel, Ivanka Netinger Grubeša, Ana Mladenovič, 2022, izvirni znanstveni članek Povzetek: This paper presents an experimental investigation of the compressive behavior of highstrength self-compacting concrete exposed to temperatures up to 600 C. Ten different concrete compositions were tested, in which part of the cement (by weight) was replaced by three different mineral additives (5–15% metakaolin, 20–40% fly ash and 5–15% limestone). The stress–strain curves, compressive strength, modulus of elasticity and strain at peak stress were evaluated from uniaxial compression tests. Scanning electron microscope micrographs were also taken to evaluate the damage caused by the high temperatures. A sharp decrease in mechanical properties and an increase in peak strain were observed already after 200 C for all mixes tested. The different mineral additives used in this study affected the variations of residual compressive strength by 24% and peak strain by 38%, while the variations of residual modulus elasticity were 14%. Comparing the obtained results with the recommendations for compressive strength given in regulatory code EN 1992-1-2 for high strength concrete, it can be concluded that the strength loss observed in EN 1992-1-2 at temperatures up to 400 C is too conservative. The Popovics model for the relationship between stress and strain provided a good approximation for the experimentally determined stress–strain curves at different temperatures.
Ključne besede: self-compacting concrete, mineral additives, high temperatures, residual mechanical properties, open access
Objavljeno v DiRROS: 28.04.2023; Ogledov: 422; Prenosov: 201
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42. The effect of the addition of construction & demolition waste on the properties of clay-based ceramicsBiljana Angjusheva, Vilma Ducman, Emilija Fidanchevski, 2022, izvirni znanstveni članek Povzetek: Waste glass and reclaimed brick are types of construction and demolition waste (C&DW) that could potentially be used as secondary raw materials in the production of ceramics. Ceramics based on clay, waste demolished brick (5-15 wt.%) and waste glass (5-20 wt.%) were produced by pressing (P = 68 MPa) and subsequently sintered at 900, 950, 1000, and 1050 ° C for one hour. The physical and mechanical properties of the ceramics obtained were evaluated. The addition of demolished brick decreased the density and mechanical properties of the clay specimens and increased the water absorption. The incorporation of waste glass improved the sintering behavior and its mechanical properties. The addition of 20 wt.% waste glass and 10 wt.% waste demolished brick into the clay matrix improved the flexural strength by up to 20.6 % and decreased the water absorption by up to 22 %. The approach presented promotes an opportunity to recycle construction and demolition waste into alternative resource materials, and represents a positive contribution to the environment.
Ključne besede: CDW, ceramics, properties
Objavljeno v DiRROS: 25.04.2023; Ogledov: 416; Prenosov: 211
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43. Structural and elastic properties of AgNi[sub]10 alloy studied with ab-initio calculationsJide Liu, Xue Wang, Xiaoming Du, Ming Xie Xie, Jinguo Li, Shangqiang Zhao, Yizhou Zhou, Qiao Zhang, Jiheng Fang, 2022, izvirni znanstveni članek Ključne besede: AgNi[sub]10 alloy, ab initio calculations, elastic anisotropy, thermodynamic properties
Objavljeno v DiRROS: 22.06.2022; Ogledov: 637; Prenosov: 157
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45. Current trends on mechanical, corrosion resistance, and antibacterial properties of metallic materials : editorialMarjetka Conradi, Aleksandra Kocijan, 2022, predgovor, uvodnik, spremna beseda Ključne besede: steel, corrosion resistance, mechanical properties, antibacterial properties
Objavljeno v DiRROS: 22.06.2022; Ogledov: 554; Prenosov: 145
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48. Effect of the N[sub]2/Ar flow ratio on the microstructure and mechanical properties of TiSiCN coatingsJin Wang, Mengting Wang, Yongqiang Wang, Dayan Ma, Hao Li, 2021, izvirni znanstveni članek Ključne besede: TiSiCN, multi-arc ion plating, magnetron sputtering, N[sub]2/Ar flow ratio, mechanical properties, tribological properties
Objavljeno v DiRROS: 06.05.2022; Ogledov: 478; Prenosov: 136
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49. Influence of deep cryogenic treatment on natural and artificial aging of Al-Mg-Si alloy EN AW 6026Matic Klug Jovičević, Rok Rezar, Patricia Jovičević Klug, Bojan Podgornik, 2022, izvirni znanstveni članek Ključne besede: aluminum alloy, microstructure, mechanical properties, precipitation, dispersoids, deep cryogenic treatment
Objavljeno v DiRROS: 06.05.2022; Ogledov: 586; Prenosov: 221
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50. The evolution of microstructure and mechanical properties of Zn-0.8Mg-0.2Sr alloy prepared by casting and extrusionJiří Kubásek, Jan Pinc, Klára Hosová, Markéta Straková, Orsolya Molnárová, Jan Duchoň, David Nečas, Miroslav Čavojský, Matjaž Godec, Irena Paulin, 2022, izvirni znanstveni članek Ključne besede: zinc, magnesium, biodegradable, microstructure, mechanical properties, texture
Objavljeno v DiRROS: 06.05.2022; Ogledov: 799; Prenosov: 222
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