Alkali activated materials (AAMs), a potential alternative to cement-based products or ceramics, can incorporate large amounts of currently landfilled aluminosilicate rich such as calcined clay-rich river sediments collected at hydropower plant dams. Untreated fresh sediment and untreated aged intended serve AAM precursors were increase their amorphous content, then by Na K-based silicate hydroxide solutions cured 60 °C for three days. Up 30 mass % (ma%) fly ash (FA) ladle slag (LS)...

The gradual replacement of coal by local renewable resources leads to an increased production co-combustion ashes (CC). Their disposal can be limited their use in the construction sector, where they partially replace primary raw materials. This study evaluates incorporation selected Slovenian CC ash into clay-based fired bricks within EU AshCycle project. tests included measurement water absorption, porosity, density, weight loss, shrinkage, flexural and compressive strength, freeze-thaw...

The incorporation mechanism of impurities derived from raw materials into a belite-sulfoaluminate cement clinker with bottom ash was investigated in two mixtures. Alkalis lowered the sintering temperature by 50 °C. Ti stabilized β belite and prevented formation γ-belite. Sodalite solid solution showed an incomplete substitution Si Al. At higher content ferrite trended towards perovskite composition. Although calcium sulfoaluminate only fully developted at 1300 °C, clinkers sintered 1200 °C...

Fly ash and phosphogypsum were used as Naturally Occurring Radioactive Materials (NORM) by-products for the synthesis of belite-sulfoaluminate clinkers. The influence raw mixture composition firing temperature was investigated. Clinkers cements examined by X-ray powder diffraction scanning electron microscopy with energy dispersive spectroscopy. compressive strength determined after 28 days. Clinker phases identified included ye’elimite, ß-phase belite, ternesite gehlenite, while main...

The late Eocene to Recent dynamics of the NW External Dinarides in Slovenia are described.The study is focused on orogen-parallel NW-SE striking family faults, which represent main source seismic hazard today.Approximately 1700 faultslip datasets were collected at 70 locations and used for palaeostress analysis.Structural relationships observed field, allowed construction a relative chronology between documented fault shear joint sets, facilitating reconstruction their kinematic evolution...

This study investigated the influence of different cooling regimes on microstructure and consequent reactivity belite-sulfoaluminate clinkers. The cement clinkers were synthesized by incorporating secondary raw materials, such as titanogypsum bottom ash, to natural materials. Clinker phases determined Rietveld quantitative phase analysis, while distribution morphology incorporation substitute ions in characterized scanning electron microscopy using energy-dispersive X-ray spectroscopy...

The persistent nature of the SARS-CoV-2 virus, characterized by its large-scale periodical recurrence and high infectivity, has imposed an increasing demand for rapid frequent tests. This paper presents a simple, disposable, sensitive, selective label-free sensor impedimetric detection virus Spike S1 protein. We modified screen-printed carbon electrode with gelatin as biocompatible support to deposit protein A layer, acting structure-directing agent subsequent site-induced binding...

In order to detect recently tectonically active faults, Stream Length-gradient (SL) index and a newly developed method of river gradient analysis were made for three rivers. Two methods used on the southern part Ljubljana moor, where rivers cross dextral (right-lateral) faults with Dinaric orientation (NW-SE). Watercourse profiles analysed first, using »classic«, well established SL index. However, this didn't yield useful results since almost no variability in indexes observed....

Abstract Purpose Alkali activation process has been applied to fresh river clay-rich sediments in order increase their mechanical properties and make them suitable for soil stabilization. Materials methods Dredged were mixed with up 30 mass percent (ma%) of fly ash (FA) or ladle slag (LS) after curing 3 days at 60 °C, the bending compressive strength have determined. The mixtures which exhibited highest strengths further optimized being used For this purpose, sediment was stabilized 4 ma%...

The potential use of steel slag from treated in belite-sulfoaluminate cements was investigated this study. Cement clinkers with two phase compositions were synthesized, allowing the incorporation different amounts slag. composition and microstructure cement at three sintering temperatures studied by X-ray powder diffraction Rietveld method, as well scanning electron microscopy energy dispersive spectrometry. results showed that targeted achieved a temperature 1250 °C. However, higher amount...

The ever-growing worldwide demand for fired clay brick has resulted in the shortage of many parts world. Therefore, there is a need to look more sustainable alternative materials manufacturing. This study investigated potential use untreated Drava River sediment as substitute material production bricks, with research being conducted at both laboratory and industrial level. At level, specimens were prepared by mixing different river proportions (ranging from 10 50 wt%) 950 °C, microstructural...

The bottleneck in the process for increasing production of low CO2 mineral binders, based on BCSA (belite sulfoaluminate) clinkers, is availability Al-rich raw materials. For that purpose, a new registry Al-containing secondary residues (industrial and mine waste) has been developed presented this paper. methodology creating consists three main steps: Gathering ideas, consolidation implementation. In order to achieve this, following was adopted: Analysis similar registries by potential...

The study focused on the post-Middle-Miocene stress analysis within dextral strike-slip zone of Dinaric fault system in collision between European plate, Adria microplate and Pannonian Domain. Block rotations were studied by re-examination available paleostress data their spatial distribution. results are agreement with existing block model area, indicating CCW blocks main faults which rotation angle increases from E to W. improved kinematic model, is proposed this study, will contribute...

The aim of this study was to determine properties the tectonic contact between Permian/Mesozoic limestones and less competent Miocene clastites on northeastern foothill Boč Mt. Because fault planes significantly mark relief, studied by a detailed structural mapping, which showed that is limited subvertical faults in its part. To ensure mapped compatible with regional geodynamics area, additionally paleostress analysis fault-slip data performed. Four individual tensor groups were documented...

The increase in industrial waste generation presents a global problem that is consequence of the needs modern society. To achieve goals EU Green Deal and to promote concept circular economy (CE), valorization residues as secondary raw materials offers pathway economic, environmental, energetic, social sustainability. In this respect, Al-containing from alumina processing (red mud), thermal power plants (fly ash bottom ash), metallurgy (slag), well other industries, present valuable mineral...

Dredged river sediments are currently a waste material which is mainly landfilled or reintegrated into rivers. They can also be used as renewable resource for the construction sector. Pre-treatments at high temperatures allow their use more advanced applications such supplementary cementitious materials (SCMs) precursor alkali activated (AAMs). The work presented here shows that flame synthesis to almost completely vitrify and increase leachability Al Si beyond levels achieved by...

The preconditioning and modification of the supporting electrode surface is an essential step in every biosensor architecture. In particular, when using screen-printed carbon electrodes (SPEs) as inexpensive convenient disposable sensor substrates, their somewhat lower electrochemical (surface) reproducibility might represent a complex hurdle. Herein, we investigated effect selected strategies, such cyclic voltammetric pretreatment, H2SO4 H2O2 plasma pretreatment with positive negative glow...

In this paper, the effects of sintering temperature on pore evolution belite-sulfoaluminate cement clinker were evaluated.Belite-sulfoaluminate with a targeted composition 65 w/% b-belite, 20 calcium sulfoaluminate and 10 ferrite was sintered at three different temperatures: 1200 °C, 1250 °C 1300 °C.To quantitatively evaluate during sintering, 3D microstructure reconstruction by micro-CT used.From data, volume fraction number extracted compared, size distribution obtained as...

<p>Various industrial residues that are either landfilled or currently have a low recycling rate could represent important secondary mineral resource potential for the construction sector. An ever-increasing sector causes increased demand cement-based materials and consequently implies in increase of CO<sub>2</sub> emission. Belite-sulfoaluminate cements potentially an alternative cementitious binder to ordinary Portland cements, due lower embodied...