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Wyświetlanie 1-8 z 8
Tytuł:
Properties of cement mortars modified with commercial nanosilica
Właściwości zapraw cementowych modyfikowanych nanokrzemionką komercyjną
Autorzy:
Horszczaruk, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/402422.pdf
Data publikacji:
2019
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
nanosilica
mechanical properties
cement mortars
nanokrzemionka
właściwości mechaniczne
zaprawy cementowe
Opis:
Nanosilica as a commercial product dedicated to construction remains a relatively expensive chemical admixture for concrete and cement mortars. Economic considerations are a major barrier to the industrial use of nanosilica in the building materials industry. With respect to nanosilica, the following have been confirmed: accelerating the effect of C3S hydration, accelerated C-S-H gel formation, modification of the mixture viscosity, improvement of cement matrix tightness, also at high temperature. The efficiency of nanosilica depends on its even distribution in the composite, therefore disagglomeration is necessary for the proper design of mortar or concrete. The article presents the results of tests on cement mortars modified with different amounts of colloidal nanosilica. It is an nano-SiO2 admixture in the form of an aqueous dispersion containing up to 50% pure nanosilica, which is produced on an industrial scale as an admixture for concrete and cement mortars. Dispersions of nanosilica in composite using ultrasound were used. The possibilities of using nanosilica as an admixture improving the early strength of cement composites were pointed out.
Nanokrzemionka jako produkt komercyjny dedykowany dla budownictwa pozostaje nadal stosunkowo drogą domieszką chemiczną do betonów i zapraw cementowych. Względy ekonomiczne są główną barierą w przemysłowym zastosowaniu nanokrzemionki w przemyśle materiałów budowlanych. W odniesieniu do nanokrzemionki potwierdzono: przyspieszające działanie na hydratację C3S, przyspieszone tworzenia się żelu C-S-H, modyfikację lepkości mieszanki, poprawę szczelności matrycy cementowej, także w warunkach wysokiej temperatury. Wydajność nanokrzemionki zależy od jej równomiernego rozmieszczenia w kompozycie, dlatego dezaglomeracja jest niezbędna do prawidłowego zaprojektowania zaprawy lub betonu. W artykule przedstawiono wyniki badań zapraw cementowych modyfikowanych różną ilością nanokrzemionki koloidalnej. Jest to domieszka nano-SiO2 w postaci wodnej dyspersji zawierającej do 50% czystej nanokrzemionki, która produkowana jest na skalę przemysłową jako domieszka do betonów i zapraw cementowych. W badaniach zastosowano dyspersję nanokrzemionki w kompozycie z wykorzystaniem ultradźwięków. Wskazano na możliwości zastosowania nanokrzemionki jako domieszki poprawiającej wczesną wytrzymałość kompozytów cementowych.
Źródło:
Structure and Environment; 2019, 11, 4; 247-255
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of glass and ceramic waste on selected properties of materials with a cement
Autorzy:
Jura, J.
Ulewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/104251.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
cement mortars
mechanical properties
utilitarian ceramics
sanitary ceramics
CRT glass
Opis:
The article presents the impact of selected waste materials (usable ceramics, sanitary ceramics, CRT glass cullet) on the physical and mechanical properties of cement-based materials (cement mortars). The samples of cement mortars made were 10, 20 and 30% addition of waste material. Physical and mechanical properties of modified cement mortars were compared with standard mortar. The highest compressive strength obtained mortar with the addition of usable and sanitary ceramics in the amount of 30%. The mortar was also characterized by the lowest decreases in compressive strength after frost resistance tests. The use of 30% sanitary ceramics resulted a compressive strength drop of 3.5% compared to 18% for the standard mortar. The absorbability of all samples differed slightly.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 1; 81-87
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of pozzolans addition on cement mortars
Autorzy:
Konca, P.
Powiązania:
https://bibliotekanauki.pl/articles/104197.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
cement mortars
microsilica
zeolite
physical properties
freeze-thaw resistance
capillary suction
Opis:
The addition of microsilica was widely used in concretes and mortars since the second half of the 20th century (in high and very high strength concretes). Silica fume consists of very fine spherical particles. This additive, thanks to its properties, fills the space between cement particles and aggregates which affects: porosity, watertightness, shrinkage reduction and increased strength. The microsilica has pozzolanic properties and reacts with calcium hydroxide and gradually forms a uniform and continuous contact phase C-S-H (calcium-silicat hydrate). The interfacial zone between cement paste and aggregate has been considered as a zone of weakness. Zeolite is a material lesser known in civil engineering which can be used as an alternative to microsilica. The article presents the investigation of the physical properties of mortars containing these two types of pozzolan. In mixes pozzolan additives at 0 to 20 percent by mass of portland cement are used. Testing of such properties of fresh mortar as workability and air content was carried out. The properties of hardened mortar such as strength, water absorption, frost resistance and capillary suction were also determined.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 1; 109-116
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evaluation of the possible utilization of waste glass in sustainable mortars
Autorzy:
Dębska, Bernardeta
Krasoń, Joanna
Lichołai, Lech
Powiązania:
https://bibliotekanauki.pl/articles/2065623.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska
Tematy:
glass waste
cement mortars
mechanical properties
absorbability
odpady szklane
zaprawy cementowe
właściwości mechaniczne
wchłanialność
Opis:
The assumptions of the low-carbon economy and sustainable development in construction leads to the search for ecological solutions in materials whose production generates significant amounts of carbon dioxide. Cement substitution with waste glass powder used in building mortars is part of this trending solution. This paper describes the results on the selective properties of mortars containing powdered waste glass in the amount of 0-20% by weight. The proposed modification gives satisfactory physical and mechanical properties to the cement mortars used in the building industry.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2020, 9, 2; 7--15
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Designing Cement Mortars Modified with Cork and Rubber Waste Using Theory of the Experiment
Autorzy:
Dębska, Bernardeta
Krasoń, Joanna
Lichołai, Lech
Powiązania:
https://bibliotekanauki.pl/articles/124330.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
rubber waste
cork waste
cement mortars
Design of Experiments
DoE
Response Surface Methodology
RSM
Opis:
The article concerns the possibility of obtaining modified cement mortars and assessing their selected properties, i.e. bending and compressive strength, volume density of hardened mortars and water absorption. The modification consisted in a partial (0–50% vol.) substitution of sand by waste, crushed rubber, and cork. In the mortar design process, the theory of the experiment was used. The central composite design used available in the Statistica software package was response surface. This approach allowed to significantly reduce the number of experiments, reduce costs, and at the same time keep the maximum information about the mortars tested. The conducted research showed that waste materials can be an alternative to natural aggregates in the process of obtaining light mortars.
Źródło:
Journal of Ecological Engineering; 2019, 20, 9; 121-130
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the impact of high temperature on the change in tensile strength of cement mortars with or without polypropylene fibres added
Autorzy:
Drzymala, T.
Reszka, M.
Powiązania:
https://bibliotekanauki.pl/articles/30147052.pdf
Data publikacji:
2018
Wydawca:
Akademia Wojsk Lądowych imienia generała Tadeusza Kościuszki
Tematy:
cement composites
cement mortars
tensile strength
mechanical properties
high temperature impact
thermal spalling
concrete
reinforced concrete
polypropylene fibre
Opis:
When evaluating concrete, its strength is the most important feature from the practical point of view. In compliance with technological requirements, the strength of concrete depends primarily on its composition, mainly on the content and strength of cement slurry. This is because this concrete component is most susceptible to changes in working conditions in a construction, including high temperature impact on concrete during the fire. The paper presents the results of tests performed on the cement mortar with and without the addition of polypropylene fibers. This treatment allowed for the elimination of the effect of the coarse aggregate by reason of the accuracy of the tested strength characteristics. The studies concerned the impact of high temperature on the change in tensile strength of cement mortars modified with the addition of polypropylene fibers. The analysis of available literature shows that one of the main causes of concrete’s thermal spalling is seen in high tensile stresses. The results of many tests prove that the addition of polypropylene fibers can have a positive effect on the behavior of concrete structures at high temperatures and help reduce spalling. The polypropylene fibers present in a composite may also positively influence the increase in tensile strength. This article discusses the purpose and scope of research, research methods, the experiment plan, test benches, and test results as well. The conclusions of the study were formulated in the final part of the article.
Źródło:
Scientific Journal of the Military University of Land Forces; 2018, 50, 3(189); 109-126
2544-7122
2545-0719
Pojawia się w:
Scientific Journal of the Military University of Land Forces
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Taguchi method for the design of cement mortars containing waste materials
Autorzy:
Dębska, Bernardeta
Krasoń, Joanna
Lichołai, Lech
Powiązania:
https://bibliotekanauki.pl/articles/2065613.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska
Tematy:
rubber waste
cork waste
cement mortars
design of experiments
Taguchi method
odpady gumowe
korek
zaprawy cementowe
projektowanie doświadczeń
metoda Taguchi
Opis:
Industries related to the acquiring of building materials may soon face a shortage of natural resources and an associated increase in costs of their acquisition. Therefore, it is necessary to look for possible ways to reduce the exploitation of natural resources and instead use recycled raw materials. Such policies fit into one of the most important trends in modern construction, which is sustainable development. In the conducted research, the Taguchi method was utilized in order to investigate the impact of modifying cement mortars with rubber and cork waste on the selected properties of the obtained composites. Thanks to the above method, we managed to obtain the desired information about mortars in a shorter time and at a lower cost than using traditional testing methods. Using the selection in planning method, we confirmed that rubber waste can be a good substitute for sand in mortars.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2020, 9, 1; 15--26
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
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
    Wyświetlanie 1-8 z 8

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