Iskanje po repozitoriju

A+ | A- | | SLO | ENG

Povzetek: One of the main challenges in road construction and maintenance is ensuring traceability and transparency in managing large quantities of excavated soil and stone. In Slovenia, around 7 million tons of such materials are produced annually. They are often reused on - site or backfilled, yet still treated as waste, without considering their chemical and geotechnical properties or potential value. The new EU Construction Products Regulation (EC 3110/2024) introduces digital product passports to improve transparency and traceability of material properties. Although excavated soil and stone are not clearly defined as construction products under this regulation, applying its principles is increasingly important due to the large volumes involved. This research addresses digital product passport requirements and presents the development of digital material passport platforms for excavated soil and stone within the LIFE IP RESTART project. It explores pathways based on material status , such as waste, by - product, or construction product, supporting more efficient resource use in line with circular economy principles .
Ključne besede: circular economy, digital product passport, excavated soil and stone, construction and demolition waste management
Objavljeno v DiRROS: 14.08.2026; Ogledov: 270; Prenosov: 140
Celotno besedilo (401,84 KB)
Gradivo ima več datotek! Več...

Povzetek: One strategy for reducing the environmental impact of urban residential systems is the development of shared-access spaces that allow multiple households to use facilities that are typically privately owned. To date, however, cross-contextual evidence on interest in such arrangements remains limited, particularly for specific types of shared spaces. This study draws on a survey of 3077 individuals in the Netherlands, Slovenia, and Sweden to examine self-reported willingness to share three types of residential spaces: kitchen- and-dining areas, work-from-home spaces, and workshops. Using ordered logit models, we analyze how stated willingness varies with socio-demographic characteristics, prior experience, attitudes, and national context. The results indicate that responses differ across both space types and countries, with consistent positive associations observed for prior experience, environmental efficacy, and self-reported extraversion. At the same time, substantial variation across demographic groups and national contexts suggests that interest in shared-access spaces is not uniform. While a considerable share of respondents express openness to at least some forms of sharing, the findings should be interpreted as indicative of stated preferences under hypothetical conditions rather than realized demand. These results contribute to a more differentiated understanding of how interest in shared residential functions varies across populations and contexts, and provide a basis for further research on the design and feasibility of shared-access housing models.
Ključne besede: sharing economy, shared housing, urban housing, circular housing
Objavljeno v DiRROS: 03.08.2026; Ogledov: 175; Prenosov: 166
Celotno besedilo (1,08 MB)
Gradivo ima več datotek! Več...

Povzetek: Adopting the approach of industrial symbiosis, where waste from one company becomes input for another, aligns with global sustainability goals, including the Paris Agreement, UN 2030 Agenda, and European Green Deal. These initiatives promote a development model balancing profitability, social progress, and environmental protection. This chapter examines strategies and policies for sustainable resource management, heightened by COVID-19, and the EU's push for systematic implementation through the European Green Deal and NextGenerationEU. The research question addresses whether existing regulations and practices are sufficient for meeting the EU's green and digital commitments.
Ključne besede: industrial symbiosis, circular economy, European Green Deal, sustainable development, NextGenerationEU
Objavljeno v DiRROS: 12.06.2026; Ogledov: 410; Prenosov: 146
Celotno besedilo (3,68 MB)

Povzetek: The study investigates alkali-activated fly ash (FA) composites reinforced with keratin-based fibres from Chesapeake Bay Retrievers. To increase reactivity, the FA was milled and sieved below 125 μm, while the fibres were incorporated at two mass ratios (1 m% and 5 m%) relative to the FA as part of the preliminary study. Mechanical tests on 3-day-old composites showed that the addition of 1 m% fibres improved performance significantly, increasing the compressive strength by almost 50% (to ~70 MPa) and bending strength by over 30%. In contrast, the addition of 5 m% fibres resulted in a “hairy”, low-binder structure with reduced geometric density and compressive strength. Nevertheless, the fibre- rich composite displayed a unique cushioning effect that restored shape under cyclic pressure, suggesting potential for non-structural applications such as pathways or insulation. The results demonstrated that small additions of keratin fibres can improve the performance of AAM, but excessive fibre content compromises its strength.
Ključne besede: alkali-activated materials, fly ash, keratin-based fibres, Chesapeake Bay Retriever, circular economy
Objavljeno v DiRROS: 15.05.2026; Ogledov: 463; Prenosov: 343
Celotno besedilo (736,65 KB)
Gradivo ima več datotek! Več...

Povzetek: The European Union’s shift towards a circular economy emphasizes the substitution of virgin materials with recycled alternatives, particularly in the construction sector, which can accommodate large volumes of industrial by-products. Ashes from coal, biomass, paper sludge, and co-combustion processes are abundant secondary materials whose variable chemical and mineralogical compositions necessitate careful assessment to enable safe and effective reuse.This study investigates the hydration behaviour and early carbonation potential of ashes of different origin. The ashes were characterized using X-ray fluorescence, X-ray diffraction, and scanning electron microscopy coupled with energy-dispersive spectroscopy. Hydraulic reactivity was evaluated by preparing ash pastes at a 1:1 water-to-ash ratio and monitoring hydration product formation over time using XRD. Carbonation of co-combustion ash was studied under controlled CO₂ conditions (2 % CO₂, 50 % RH, 20 °C ± 1 °C) at different moisture contents (0 wt.%, 10 wt.%, 20 wt.%, and 40 wt.%) and early curing times (0 hours, 1 hours, 4 hours, and 24 hours).Results indicate distinct differences among the ashes. Paper sludge ash exhibited the most extensive formation of calcium aluminate hydrates, coal and co-combustion ashes showed moderate hydration, while biomass ash produced only minor secondary phases. Carbonation of co-combustion ash proceeded concurrently with hydration, with lime depletion and calcite formation enhanced by higher moisture and longer curing. These coupled processes influenced both the kinetics and composition of hydration products. The findings demonstrate the potential of diverse combustion ashes for valorisation in construction materials and provide insight into their reactivity under early-age hydration and carbonation conditions, supporting circular economy initiatives.
Ključne besede: circular economy, ashes from combustion, hydraulic activity, carbonation, phase composition, amorphous phase
Objavljeno v DiRROS: 14.01.2026; Ogledov: 587; Prenosov: 398
Celotno besedilo (4,15 MB)
Gradivo ima več datotek! Več...