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    Wyświetlanie 1-5 z 5
    Tytuł:
    Evaluation of different binder combinations of cement, slag and ckd for s/s treatment of tbt contaminated sediments
    Autorzy:
    Lindh, Per
    Lemenkova, Polina
    Powiązania:
    https://bibliotekanauki.pl/articles/2111456.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    cement kiln dust
    CKD
    marine sediments
    tributyltin
    TBT
    leaching
    s/s soils
    Opis:
    The seabed in the ports needs to be regularly cleaned from the marine sediments for safe navigation. Sediments contaminated by tributyltin (TBT) are environmentally harmful and require treatment before recycling. Treatment methods include leaching, stabilisation and solidification to remove toxic chemicals from the sediments and improve their strength for reuse in the construction works. This study evaluated the effects of adding three different binder components (cement, cement kiln dust (CKD) and slag) to treat sediment samples collected in the port of Gothenburg. The goal of this study is to assess the leaching of TBT from the dredged marine sediments contaminated by TBT. The various methods employed for the treatment of sediments include the application of varied ratios of binders. The project has been performed by the Swedish Geotechnical Institute (SGI) on behalf of the Cementa (HeidelbergCement Group) and Cowi Consulting Group, within the framework of the Arendal project. An experiment has been designed to evaluate the effects of adding CKD while reducing cement and slag for sediment treatment. Methods that have been adopted include laboratory processing of samples for leaching using different binder combinations, followed by statistical data processing and graphical plotting. The results of the experiment on leaching of TBT for all samples are tested with a varied ratio of cement, slag, CKD and water. Specimens with added binders 'cement/CKD' have demonstrated higher leaching compared to the ratio 'cement/slag/CKD' and 'cement/slag'. The 'CKD/slag' ratio has presented the best results followed by the ‘cement/slag/CKD’, and can be used as an effective method of s/s treatment of the sediments. The results have shown that the replacement of cement and slag by CKD is effective at TBT leaching for the treatment of toxic marine sediments contaminated by TBT.
    Źródło:
    Acta Mechanica et Automatica; 2021, 15, 4; 236--248
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismic velocity of P-waves to evaluate strength of stabilized soil for Svenska Cellulosa Aktiebolaget Biorefinery Östrand AB, Timrå
    Autorzy:
    Lindh, Per
    Lemenkova, Polina
    Powiązania:
    https://bibliotekanauki.pl/articles/2173666.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    unconfined compressive strength
    P-wave velocity
    stabilized soil
    cement
    slag
    nieograniczona wytrzymałość na ściskanie
    prędkość fali P
    gleba stabilizowana
    żużel
    Opis:
    Evaluating soil strength by geophysical methods using P-waves was undertaken in this study to assess the effects of changed binder ratios on stabilization and compression characteristics. The materials included dredged sediments collected in the seabed of Timrå region, north Sweden. The Portland cement (Basement CEM II/A-V, SS EN 197-1) and ground granulated blast furnace slag (GGBFS) were used as stabilizers. The experiments were performed on behalf of the Svenska Cellulosa Aktiebolaget (SCA) Biorefinery Östrand AB pulp mill. Quantity of binder included 150, 120 and 100 kg. The properties of soil were evaluated after 28, 42, 43, 70, 71 and 85 days of curing using applied geophysical methods of measuring the travel time of primary wave propagation. The P-waves were determined to evaluate the strength of stabilized soils. The results demonstrated variation of P-waves velocity depending on stabilizing agent and curing time in various ratios: Low water/High binder (LW/HB), High water/Low binder (HW/LB) and percentage of agents (CEM II/A-V/GGBFS) as 30%/70%, 50%/50% and 70%/30%. The compression characteristics of soils were assessed using uniaxial compressive strength (UCS). The P-wave velocities were higher for samples stabilized with LW/HB compared to those with HW/LB. The primary wave propagation increased over curing time for all stabilized mixes along with the increased UCS, which proves a tight correlation with the increased strength of soil solidified by the agents. Increased water ratio gives a lower strength by maintained amount of binder and vice versa.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 4; art. no. e141593
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soil contamination from heavy metals and persistent organic pollutants (PAH, PCB and HCB) in the coastal area of Västernorrland, Sweden
    Zanieczyszczenie gleby metalami ciężkimi i trwałymi zanieczyszczeniami organicznymi (WWA, PCB i HCB) na obszarze przybrzeżnym Västernorrland, Szwecja
    Autorzy:
    Lindh, Per
    Lemenkova, Polina
    Powiązania:
    https://bibliotekanauki.pl/articles/2173846.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    marine pollution
    soil contamination
    civil engineering
    geotechnical engineering
    Baltic Sea
    zanieczyszczenie gleby
    zanieczyszczenia morskie
    inżynieria lądowa
    geotechnika
    morze Bałtyckie
    Opis:
    This paper presents an experimental study on the leaching of heavy metals, toxic chemicals and persistent organic pollutants (POPs) – PAH, PCB and HCB – from soil dredged from the coastal area of Västernorrland in northern Sweden. The soil was stabilized with cement/slag. Samples were subjected to modified surface leaching and shake tests using technical standards of the Swedish Geotechnical Institute (SGI). The experiments were performed using different blends of binding agents (30/70, 50/50, 70/30) and binder quantities (120 and 150 kg/m3) to analyze their effects on leaching. Soil properties, tools, and workflow are described. Binders included Portland cement and ground granulated blast furnace slag (GGBFS). Samples were tested to evaluate the min/max contents of pollutants (μg/l) for heavy metals (As, Ba, Pb, Cd, Co, Cu, Cr, Hg, Mn, Mo, Ni, S, V, Zn) and the hydrocarbon fraction index in the excess water. The leaching of heavy metals and POPs was assessed in sediments after the addition of the binder. The comparison was made against the two mixes (cement/slag in 30/70% and high/low binder with low/high water ratio). The results showed that 70% slag decreases the leaching of heavy metals and POPs. The equilibrium concentrations of DOC and heavy metals at L/S 10 (μg/l) were measured during the shake experiments to compare their levels in the groundwater that was used as a leachate. The leached content was assessed at L/S 10 in the upscaling experiments using four samples for PAH, PCB and various fractions of hydrocarbons: C10–C40, C10–C12, C12–C16 and C35–C40. The shake test showed a decrease in the leaching of heavy metals and POP substances from the soil subjected to stabilization by a higher amount of slag added as a binder. A binder blend with 30% cement and 70% of GGBFS showed the best performance.
    Niniejszy artykuł przedstawia eksperymentalne badania dotyczące wymywania metali ciężkich, toksycznych chemikaliów i trwałych zanieczyszczeń organicznych (TZO): WWA, PCB i HCB z pobranej gleby na obszarze przybrzeżnym Västernorrland w północnej Szwecji. Gleba była stabilizowana cementem/żużlem. Próbki poddano zmodyfikowanym próbom wypłukiwania powierzchniowego i wstrząsom z zastosowaniem standardów technicznych Szwedzkiego Instytutu Geotechnicznego (SGI). Eksperymenty przeprowadzono przy użyciu różnych mieszanek środków wiążących (30/70, 50/50, 70/30) i ilości środka wiążącego (120 i 150 kg/m3) w celu przeanalizowania ich wpływu na ługowanie. Opisano właściwości gleby, narzędzia i przebieg pracy. Spoiwa obejmowały cement portlandzki i mielony granulowany żużel wielkopiecowy (GGBFS). Próbki zostały przetestowane w celu określenia min/max zawartości zanieczyszczeń (μg/l) dla metali ciężkich (As, Ba, Pb, Cd, Co, Cu, Cr, Hg, Mn, Mo, Ni, S, V, Zn) i wskaźnika frakcji węglowodorowej w nadmiarze wody. Wymywanie metali ciężkich i TZO oceniano w osadach po dodaniu lepiszcza. Porównania dokonano dla dwóch mieszanek (cement/żużel w 30/70% i spoiwo o wysokiej/niskiej zawartości z niskim/wysokim stosunkiem wody). Wyniki wykazały, że 70% żużel zmniejsza wymywanie metali ciężkich i TZO. Stężenia równowagowe DOC i metali ciężkich przy L/S 10 (μg/l) mierzono podczas eksperymentów z wytrząsaniem w celu porównania ich poziomów w wodzie gruntowej stosowanej jako odciek. Zawartość wyługowaną oszacowano na poziomie L/S 10 w eksperymencie upscalingu (zwiększenia skali) przy użyciu 4 próbek WWA, PCB i różnych frakcji węglowodorów: C10–C40, C10–C12, C12–C16 i C35–C40. Próba wstrząsowa wykazała zmniejszenie wymywania metali ciężkich i substancji TZO z gleby poddanej stabilizacji większą ilością żużla dodawanego jako spoiwo. Najlepszą wydajność wykazała mieszanka spoiwowa zawierająca 30% cementu i 70% GGBFS.
    Źródło:
    Gospodarka Surowcami Mineralnymi; 2022, 38, 2; 147--168
    0860-0953
    Pojawia się w:
    Gospodarka Surowcami Mineralnymi
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Permeability, compressive strength and Proctor parameters of silts stabilised by Portland cement and ground granulated blast furnace slag (GGBFS)
    Autorzy:
    Lindh, Per
    Lemenkova, Polina
    Powiązania:
    https://bibliotekanauki.pl/articles/27309869.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    permeability
    porosity
    compactness
    compressive strength
    cement
    przepuszczalność
    porowatość
    ścisłość
    wytrzymałość na ściskanie
    Opis:
    The study investigates the effect of Portland cement and ground granulated blast furnace slag (GGBFS) added in changed proportions as stabilising agents on soil parameters: uniaxial compressive strength (UCS), Proctor compactness and permeability. The material included dredged clayey silts collected from the coasts of Timrå, Östrand. Soil samples were treated by different ratio of the stabilising agents and water and tested for properties. Study aimed at estimating variations of permeability, UCS and compaction of soil by changed ratio of binders. Permeability tests were performed on soil with varied stabilising agents in ratio H WL B (high water / low binder) with ratio 70/30%, 50/50%, and 30/70%. The highest level of permeability was achieved by ratio 70/30% of cement/slag, while the lowest - by 30/70%. Proctor compaction was assessed on a mixture of ash and green liquor sludge, to determine optimal moisture content for the most dense soil. The maximal dry density at 1.12 g/cm 3 was obtained by 38.75% of water in a binder. Shear strength and P-wave velocity were measured using ISO/TS17892-7 and visualised as a function of UCS. The results showed varying permeability and UCS of soil stabilised by changed ratio of CEM II/GGBS.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 4; 667--692
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic P- and S-Wave Reflection and CPT Soundings for Measuring Shear Strength in Soil Stabilized by Deep Lime/Cement Columns in Stockholm Norvik Port
    Autorzy:
    Lindh, Per
    Lemenkova, Polina
    Powiązania:
    https://bibliotekanauki.pl/articles/31339810.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    civil engineering
    soil stabilization
    compressive strength
    cement
    lime
    seismic waves
    Opis:
    In this research project, the measurements of the ultrasonic P- and S-waves and seismic cone penetration testing (CPT) were applied to identify subsurface conditions and properties of clayey soil stabilized with lime/cement columns in the Stockholm Norvik Port, Sweden. Applied geophysical methods enabled to identify a connection between the resistance of soil and strength in the stabilized columns. The records of the seismic tests were obtained in the laboratory of Swedish Geotechnical Institute (SGI) through estimated P- and S-wave velocities using techniques of resonance frequency measurement of the stabilized specimens. The CPT profiles were used to evaluate the quality of the lime/cement columns of the reinforced soil by the interpretation of signals. The relationship between the P- and S-waves demonstrated a gain in strength during soil hardening. The quality of soil was evaluated by seismic measurements with aim to achieve sufficient strength of foundations prior to the construction of the infrastructure objects and industrial works. Seismic CPT is an effective method essential to evaluate the correct placement of the CPT inside the column. This work demonstrated the alternative seismic methods supporting the up-hole technology of drilling techniques for practical purpose in civil engineering and geotechnical works.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 325-346
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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