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    Wyświetlanie 1-6 z 6
    Tytuł:
    Performance of pozzolan in trickling filter for secondary treatment of urban wastewater in Tlemcen, Algeria
    Autorzy:
    Hamidi, Amina
    Belarbi, Fadila
    Bouchelkia, Hamid
    Bouchenak Khelladi, Racha M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174349.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    physicochemical parameters
    pollution
    pozzolan
    trickling filter
    wastewater treatment
    Opis:
    The research aims to study the purification performance of a local and natural material as an input or as a biological filter for treating urban domestic wastewater. For this purpose, pozzolan was used as the biofiltration support that was provided from Beni Saf located in the North-West of Algeria. Tests were carried out with a specially modified pilot unit (TE900) for wastewater treatment over a period of four months. To assess the efficiency of the treatment, two main parameters have been focused on - the height of the sprinkler filter (40 cm and 80 cm) and the flow rate (10, 16, and 25 dm3∙h-1). Physicochemical and bacteriological analyses were carried out on raw wastewater and treated water. The obtained results show that the Beni Saf pozzolan-filled trickling filter eliminates a large fraction of the studied pollutants. The purification yields obtained are fairly encouraging; 98% for turbidity, 88% for suspended solids (SS), 94% for chemical oxygen demand (COD), and 98% for biological oxygen demand (BOD5 ). As for bacterial indicators, the formation of biofilms has significantly reduced bacterial activity with a percentage of over 80%. It can be concluded that the reduction of pollutant parameters clearly indicates the effectiveness of the treatment by this ecological process. Therefore, the use of local and natural materials for wastewater treatment can be a promising alternative based on sustainable environmental technologies and development.
    Źródło:
    Journal of Water and Land Development; 2022, 55; 166--177
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of limestone fineness on ternary cement fresh-state and early-age properties
    Autorzy:
    Ammar, N.
    Zeghichi, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/89048.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    addition
    limestone
    pozzolan
    fineness
    shrinkage
    setting time
    mechanical performance
    Opis:
    During cement production, a significant amount of CO2 is released into the atmosphere, it is estimated that the production of each ton of clinker free about a ton of second carbon oxide. The use of additions as constituents of cement reduces the amount of clinker, where CO2 emissions are reduced. The combination of two or three additions with Portland cement can develop new types of binders (ternary or quaternary cement) with improved physical and mechanical properties compared to Portland cement alone. The objective of this work involves the study of the effects of the fineness of limestone on the physical and mechanical properties of ternary cements containing pozzolan and limestone with specific area of 3500, 5500 and 11000 cm2/g, respectively. The amount of clinker is fixed at 65% , that of limestone is varied from 10 to 35% by weight of cement, the remain is constituted of pozzolanic addition. The results showed that increasing the surface area of limestone could be with a favorable effect on the physical properties in particular the setting time and the shrinkage; further to good strength, mainly at early ages. The higher dosages of pozzolan reaching 25 % gave better mechanical performances among all other mixtures. It can be concluded that the use of combined mineral additions, limestone and pozzolan could be beneficial to formulate ternary cements with improved physical and mechanical properties for mortars based on such binders.
    Źródło:
    Mining Science; 2017, 24; 195-208
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Manufacture of Clay Aggregate Doped with Pozzolan Destined for Lightweight Concrete
    Autorzy:
    Mesrar, Hamza
    Mesrar, Laila
    Touache, Abdelhamid
    Jabrane, Raouf
    Powiązania:
    https://bibliotekanauki.pl/articles/2202348.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    marl
    pozzolan
    density
    expanded clay aggregate
    concrete
    mechanical resistance
    Opis:
    In this work, marl clay was used because these materials have a very important industrial potentiality in several fields, namely ceramics. The objective was manufacturing expanded clay aggregate (ECA), with two main ingredients of marl and pozzolan at different percentages in order to integrate them into the concrete as aggregate. The physicochemical parameters of the mixture marl / Pozzolan was discussed and the results of the analyses, allowed deducing that the sample with 15% pozzolan has the most expansion rate of 16.8%, and its density of 1232 kg/m3 is in accordance with the international standard of expanded aggregates. The density of the concrete decreases with the quantity of ECA added and reaches its minimum with 1671 kg/m3 according to concrete with 50% of the expanded aggregate. The bending tests show the increase of the mechanical strength as a function of the quantities of aggregate added. The results show a very important potential with the addition of clay aggregates, density and water absorption decrease with the increase of the mechanical resistance.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 1; 349--359
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance study of low environmental impact mortars based on mineral additions and cement resistant to sulfate (CRS)
    Autorzy:
    Belagraa, L.
    Bouzid, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/88980.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    cement resistant to sulphate
    CRS
    pozzolan
    environmental performance mortars
    mechanical development
    physical-chemical properties
    Opis:
    The use of cement resistance to sulphate in aggressive environments showed a lot of benefits such us good mechanical development and therefore better durability; however, the consumption for great amount of clinker lead to random hazardous deposits, shortage of natural resources, gas and dust emissions mainly (CO2) causing negative impact on the environment. Recently, technical, economic and environmental benefits by the use of blended cements have been reported and being considered as a research area of great interest in cement production industry. The present research aim is to evaluate the effect of partial replacements of cement resistant to sulfate (CRS) by a pozzolanic addition, on the physical-chemical properties, as an alternative novel composition binder. Furthermore, the behaviour of the mortars based on this new combined blends was investigated in the study program, including chemical composition, density and fineness, consistency, setting time, swelling, shrinkage, absorption and mechanical behaviour. The results obtained showed that the substitution of pozzolan at the optimal ratio of 5% had a positive effect on the resulting cement properties, namely: greater specific surface area, reduced water demand, accelerated process of hydration, better mechanical behaviour and decreased water absorption. Therefore, economic and ecological cement based on mineral addition like pozzolan could be possible as well as advantageous to the formulation of environmental performance mortars.
    Źródło:
    Mining Science; 2016, 23; 65-76
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanical properties and microstructure of alkali activated mortar containing unexpanded clay
    Autorzy:
    Nasser, I.F.
    Ali, M.A.
    Kadhim, M.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201132.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    alkali-activated mortar
    pozzolan
    unexpanded clay
    flexural toughness
    scanning electron microscope
    thermal insulation
    pucolana
    glina nie spulchniona
    wytrzymałość na zginanie
    skaningowy mikroskop elektronowy
    izolacja termiczna
    Opis:
    Purpose: In building constructions, due to the decrease of local raw materials and for sustainability purpose, beside the need of light pieces to be used in roofing and false ceiling; an alkali-activated mortar is the new development where pozzolanic material is used instead of cement and activated by an alkaline solution. Therefore, in this research, alkali-activated mortar containing unexpanded clay as a fine aggregate with a dry density of 1652 kg/m3, compressive strength of 3.2 MPa, and thermal conductivity of 0.4 (W/m.K) was produced ,also boards were performed in a dimension of 305×152×12 mm as to use them in false ceiling, and reinforced with 0.25 and 0.5% steel fibre to improve their toughness by 370.8% and 1146.1% compared with reference boards, which made them good choice to used them in roofing and secondary ceiling. Design/methodology/approach: For preparation of alkali-activated mortar, low calcium fly ash (FA) was used as a source binder material. In addition, super-plasticizer and unexpanded clay as a fine aggregate (produce from the crushed artificial aggregate) in the ratio of 1:2.75 fly ash/fine aggregate. The paste was prepared by mixing fly ash with an alkali silicate solution, in a solid-to-liquid ratio of 0.4. Alkali silicate activator was prepared by mixing the NaOH and Na2SiO3 solutions at the mass ratios of 2.5. The concentrations of the NaOH was the same molarity of (14M).To improve the mechanical properties of the reference mortar mixture ,steel fibre with 0.25 and 0.5% content were added to the mix .The specimens were tested for water absorption, dry density, compressive strength, flexural strengths, flexural toughness, and thermal conductivity, in addition to the Scanning Electron Microscope test (SEM) for all mortar mixes. Alkali-activated mortar boards with (305×152×12 mm) were prepared and tested for flexural strength and toughness. Findings: The results indicated that the modulus of rupture for mortar boards reinforced with 0.25 and 0.5% steel fibre exhibits an increase of (3.68-12.10)%. In comparison, the toughness is increased by about 370.8% and 1146.1%, respectively, as compared with the reference mortar (without fibre) which made them resistance to accident, in addition to use them in roofing due to their thermal insulation. Research limitations/implications: Further research is needed to make a similar board using another sustainable material. We can examine the thermal insulation that we can get from these board, especially in the building in Iraq which the weather faces high temperatures. Practical implications: There is a by-product that we could get from the electricity station in Iraq. We must study how we get rid of it. Originality/value: This paper investigate how to produce a new light board using artificial aggregate made from unexpanded clay, which has many benefits in building insulation roofing.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 113, 2; 56--68
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ metakaolinitu, jako częściowego zamiennika cementu, na wybrane właściwości betonu (ASTRA MK40)
    Effect of metakaolin as partial cement replacement on selected properties of concrete (ASTRA MK40)
    Autorzy:
    Rutkowska, G.
    Pienkosz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/40817.pdf
    Data publikacji:
    2014
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    materialy budowlane
    beton
    dodatki do betonu
    dodatki pucolanowe
    metakaolinit
    cement portlandzki wieloskladnikowy
    wytrzymalosc na sciskanie
    wytrzymalosc na zginanie
    nasiakliwosc
    mrozoodpornosc
    building material
    concrete
    concrete additive
    pozzolan additive
    metakaolin
    Portland cement
    compression strength
    bending strength
    absorbability
    frost resistance
    Opis:
    Metakaolinit (ASTRA MK40) jest pucolanowym dodatkiem do betonu. Najczęściej stosowany jest jako częściowy zamiennik cementu portlandzkiego. W artykule przedstawiono wyniki badań właściwości (konsystencji, gęstości, wytrzymałości na ściskanie i zginanie oraz mrozoodporności) betonów zwykłych oraz betonów zawierających w swoim składzie różną ilość metakaolinitu. Do wykonania betonu użyto cementu portlandzkiego wieloskładnikowego CEM II/B-M (V-LL) 32,5R. Beton z dodatkiem metakaolinitu wykonano w trzech partiach, gdzie metakaolinitem zastępowano odpowiednio 5, 10 i 15% masy cementu. Po wykonaniu badań stwierdzono, że dodatek metakaolinitu zmniejsza nasiąkliwość betonu, zwiększa wytrzymałość na ściskanie i zginanie w 28. dniu dojrzewania betonu. Beton z dodatkiem metakaolinitu nie jest mrozoodporny
    Metakaolin (ASTRA MK 40) is a puzzolanic addition for concrete. Most commonly used as a partial Portland-cement replacement. This thesis is based on Portland-composite cement CEM II/B-M (V-LL) 32.5R. Concrete with added metakaolin has been made in three batches - replacing 5, 10 and 15% of cement weight. The material has been tested thoroughly. After measures have been taken the metakaolin decreases absorbility of concrete, increases flexural and compressive strength in 28 day. It turns out concrete streng-htened with metakaolin is not frost resistant.
    Źródło:
    Acta Scientiarum Polonorum. Architectura; 2014, 13, 4
    1644-0633
    Pojawia się w:
    Acta Scientiarum Polonorum. Architectura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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