941. Characteristics of lightweight aggregate concrete interfacial transition zoneVesna Milovanović, Vilma Ducman, Miroslava Radeka, 2014, original scientific article Abstract: The paper presents the characteristics of the interfacial zone between the lightweight aggregate produced on the basis of waste materials and binder matrix with the application of the methods SEM, EDS and the Vickers micro hardness test. On the basis of the SEM and EDS analysis, as well as the criteria for the atomic ratio of elements which compose some products of hydration, we can gain insight into the dominant composition of the interfacial zone. The values of the Vickers micro hardness test for four kinds of tested concrete after seven days of hydration is impossible to correlate with the composition of the interfacial zone in reliable way, whereas after twenty eight days the differences in values are insignificant.
Keywords: lightweight aggregate, waste material, interfacial zone
Published in DiRROS: 26.09.2025; Views: 198; Downloads: 103
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942. Corrosion properties of different forms of carbon steel in simulated concrete pore waterAleš Česen, Tadeja Kosec, Andraž Legat, Violeta Bokan-Bosiljkov, 2014, original scientific article Abstract: Carbon steel, such as concrete-reinforcing steel, tends to undergo corrosion processes when exposed to certain environmental actions. These are the carbonation of concrete and the ingress of chlorides into the concrete from the environment. Many times, the carbonation and chloride contamination are simultaneous processes leading to a harsh corrosion environment and subsequent corrosion problems. Monitoring the state of corrosion is thereby a very useful and powerful tool for following and evaluating the lifetime of reinforced concrete structures. Electrochemical measurements were performed to investigate different forms of carbon steel in simulated concrete pore water at different pH values with and without the presence of chlorides. Morphological characteristics of three different types of carbon steel were studied and SEM/EDX and Raman analyses of the corrosion products were performed. It was found that steel in the form of a sheet has a higher corrosion resistivity than a steel wire and a steel rod, and that the steel rod has a higher corrosion resistivity than the steel wire. The corrosion layer on carbon steel is very diverse; several morphologies were found and analyzed.
Keywords: carbon steel, metallography, corrosion, concrete, water
Published in DiRROS: 26.09.2025; Views: 229; Downloads: 127
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943. Transcriptome insights reveal root hair inhibition and ROS imbalance in radish seedlings treated with rhizome extracts of invasive Fallopia speciesKatarina Šoln, Rebeka Strah, Anna Gasperl, Špela Baebler, Maruša Pompe Novak, Edith Stabentheiner, Maria Mueller, Jasna Dolenc Koce, 2025, original scientific article Keywords: allelopathy, Bohemian knotweed, Japanese knotweed, oxidative stress, root hair, transcriptomics
Published in DiRROS: 26.09.2025; Views: 247; Downloads: 94
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944. Using weigh-in-motion data to determine bridge dynamic amplification factorJan Kalin, Aleš Žnidarič, Maja Kreslin, 2015, published scientific conference contribution Abstract: The dynamic component of bridge traffic loading is commonly taken into account with a Dynamic Amplification Factor (DAF) - the ratio between the maximum dynamic and static load effects on a bridge. In the design codes, this factor is generally higher than in reality. While this is fine for new bridges that must account for various risks during their life-time, it imposes unnecessary conservativism into assessment of the existing well defined bridges. Therefore, analysis of existing bridges should apply more realistic DAF values. One way of obtaining them experimentally is by bridge weigh-in-motion (B-WIM) measurements, which use an existing instrumented bridge or culvert to weigh all crossing vehicles at highway speeds. The B-WIM system had been equipped with two methods of obtaining an approximation to the static response of the. The first method uses the sum of influence lines. This method relies on accurate axle identification, the failure of which can have a large influence on the DAF value. The other method uses a pre-determined low-pass filter to remove the dynamic component of the measured signal; however an expert is needed to set the filter parameters. A new approach that tries to eliminate these two drawbacks has been developed. In this approach the parameters for the filter are determined automatically by fitting the filtered response to the sum of the influence lines. The measurement of DAF on a typical bridge site agrees with experiments performed in the ARCHES [1] project: dynamic amplification decreases as static loading increases.
Published in DiRROS: 26.09.2025; Views: 175; Downloads: 85
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950. Advancing subterranean conservation through Global Research on eDNA in Groundwaters (GReG)Mattia Saccò, Abdul Elmasri, Mahima Tawal, Roman Alther, Maja Zagmajster, Marjeta Konec, Nataša Mori, David Stanković, Živa Vehovar, Valerija Zakšek, 2025, other scientific articles Keywords: environmental DNA, groundwater, protection of underground ecosystems
Published in DiRROS: 25.09.2025; Views: 254; Downloads: 105
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