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Journal articles on the topic 'Puzzolan'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Bazhenova, Olga, Sofia Bazhenova, V. Nemirova, and Dmitriy Bazhenov. "The clays after heat treatment as the concrete active mineral additive." MATEC Web of Conferences 170 (2018): 03021. http://dx.doi.org/10.1051/matecconf/201817003021.

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Active mineral additives are one of the most common components of cement systems now. They are entered cements of increase in extent of hydration, the directed formation of structure of a cement stone from more stable hydrate phases of the lowered basicity, for the purpose of improvement of construction and technical properties of cements, by cutting of costs of fuel raw material resources for their production, giving to cements of some specific properties. In work the possibility of use as active mineral additives not only the granulated slags, but also local clays which industrially can give certain puzzolan properties are considered. It is proved that heat treatment of clay breeds significantly increases their puzzolan activity that does them suitable for use as active mineral additive instead of the domain granulated slag by production of the portland cement.

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2

Khademi, Faezehossadat, Mahmoud Akbari, and Sayed Mohammadmehdi Jamal. "Measuring Compressive Strength of Puzzolan Concrete by Ultrasonic Pulse Velocity Method." i-manager's Journal on Civil Engineering 5, no. 3 (August 15, 2015): 23–30. http://dx.doi.org/10.26634/jce.5.3.3427.

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3

Smorodinova, T. N., and M. K. Kotvanova. "Impact of acid treatment on the puzzolan activity of natural zeolite tuff." Journal of Physics: Conference Series 1926, no. 1 (May 1, 2021): 012037. http://dx.doi.org/10.1088/1742-6596/1926/1/012037.

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4

Butakova, M. D., and S. P. Gorbunov. "Study of the Influence of Complex Additives on Properties of the Gypsum-Cement-Puzzolan Binder and Concretes on its Basis." Procedia Engineering 150 (2016): 1461–67. http://dx.doi.org/10.1016/j.proeng.2016.07.082.

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5

Stryczek, Stanisław, Rafał Wiśniowski, Andrzej Gonet, and Albert Złotkowski. "Influence of Specific Surface of Lignite Fluidal Ashes on Rheological Properties of Sealing Slurries / Wpływ Powierzchni Właściwej Popiołów Fluidalnych z Węgla Brunatnego na Właściwości Reologiczne Zaczynów Uszczelniających." Archives of Mining Sciences 57, no. 2 (November 12, 2012): 313–22. http://dx.doi.org/10.2478/v10267-012-0019-0.

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Abstract New generation fly ashes come from the combustion of coal in fluid-bed furnaces with simultaneous sulphur-removal from gases at ca. 850°C. Accordingly, all produced ashes basically differ in their physicochemical properties from the traditional silica ones. The aim of the laboratory analyses was determining the influence of specific surface and granular composition of fluidal ash on rheological properties of slurries used for sealing up the ground and rock mass media with hole injection methods, geoengineering works and cementing casing pipes in deep boreholes. Fluidal ash from the combustion of lignite contain active Puzzolan appearing in the form of dehydrated clayey minerals and active components activating the process of hydration ashes, i.e. CaO, anhydrite II and CaCO3. The ashes have a weak point, i.e. their high water diment, which the desired rheological properties related with the range of their propagation in the rock mass cannot not be acquired for injection works in the traditional sealing slurries technology. Increasing the water-to-mixture ratio should eliminate this feature of fluidal ashes. Laboratory analyses were performed for slurries based on metallurgical cement CEM III/A 32,5 having water-to-mixture ratios: 0.5; 0.6 ; 0.7 and 0.8; the fluidal ash concentration in the slurries was 30 wt.% (with respect to the mass of dry cement). Basing on the obtained results there were determined optimum recipes of sealing slurries in view of their rheological parameters which could be applied both in drilling technologies (cementing casing pipes, closing of boreholes, plugging) and in geoengineering works related with sealing up and reinforcing ground and rock mass media.

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6

Editors, Guest. "Proceedings of the 37th National Congress of the Italian Society of Histochemistry." European Journal of Histochemistry 61, no. 2s (September 6, 2017): 1. http://dx.doi.org/10.4081/ejh.2017.2844.

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7

Hauptmann, Andreas, and Ünsal Yalcin. "Lime plaster, cement and the first puzzolanic reaction." Paléorient 26, no. 2 (2000): 61–68. http://dx.doi.org/10.3406/paleo.2000.4710.

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8

Tursunova, Gulsanam Ruzimurodovna, and Farrukh Bakhtiyarovich Atabaev. "Definition Of Puzzolanic Properties Active Mineral Additives In Portlandcement." American Journal of Applied Sciences 03, no. 03 (March 25, 2021): 7–12. http://dx.doi.org/10.37547/tajas/volume03issue03-02.

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The article presents the results of testing the use of Angren dry remote active ash and slag in Portland cement as an active mineral additive. It was found that Portland cement with the addition of Angren dry remote active ash and slag renders karrazastoy, ekanomet clinker and it is proved that hydro removed ash and slag (2011 year) does not recommend as an active mineral additive. Therefore, dry remote active ash and slag is recommended for use as an active mineral additive in the production of cement, improving its construction and technical properties. The possibility of using Angren dry remote active ash and slag as an active mineral component for producing cements with low corrosion resistance is shown. Angren dry remote active ash and slag contributes to the formation of the structure of the cement stone, increases its density and strength against aggressive ions, causing increased resistance in aggressive environments. And save up to 30% of cement. It has been established that Portland cement with the addition of Angren dry remote active ash and slag has an intensifying effect on the formation of clinker minerals. Therefore, the Angren dry remote active ash and slag is recommended for use as a mineralizing additive in the production of cement. Use of chemical industry waste with replacement of expensive natural production and consumption waste. At the same time, an environmental problem is being addressed.

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9

Stankovic, Maja, Nenad Krstic, Dragan Djordjevic, Nemanja Anastasijevic, Vojislav Mitic, Gordana Toplicic-Curcic, and Ana Momcilovic-Petronijevic. "Chemical analysis of mortars of archaeological samples from Mediana locality, Serbia." Science of Sintering 51, no. 2 (2019): 233–42. http://dx.doi.org/10.2298/sos1902233s.

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Mineralogical and chemical composition of mortar from the floor, ceiling and wall of Stibadium B, from the archaeological site of Mediana (Serbia) have been analysed using ICP-OES, F?IR and XRD-spectroscopy and chemical analysis. The results show that hydraulic lime mortar was used with crushed bricks as artificial puzzolanic aggregate. Large contribution of silicon- and aluminum-oxides, indicate the presence of quartz and phyllosilicate minerals derived from the aggregate, river sand and crushed bricks. Also, high content of Pb and Cu was observed in investigated samples.

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10

Ziegler, C. L. "Von dem Tarras, der Puzzolana und deren Substitutionsarten / On Trass, Pozzolana, and Different Kinds of Substitutes." Restoration of Buildings and Monuments 10, no. 2 (April 1, 2004): 133–62. http://dx.doi.org/10.1515/rbm-2004-5843.

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11

Barón, G., A. M. Montaño, and C. P. González. "Characterization using XRD of puzzolanic materials from residual sludge from water treatment." Journal of Physics: Conference Series 935 (December 2017): 012049. http://dx.doi.org/10.1088/1742-6596/935/1/012049.

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12

Martauz, Pavel, Vojtěch Václavík, and Branislav Cvopa. "The Influence of the Environment on the Properties of Hybrid Cement-Based Concrete with Steel and Air-Cooled Slags." Crystals 11, no. 9 (September 7, 2021): 1087. http://dx.doi.org/10.3390/cryst11091087.

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This article presents the results of research that dealt with the development of non-traditional concrete using a hybrid alkali-activated cement. It is concrete based on by-products from a metallurgical plant that replaced 100% of the natural aggregates. Steel slag (CSS, fraction: 0/8 mm) was used as a filler in combination with air-cooled slag (ACBFS, fraction: 8/16 mm and 16/32 mm). Portland blended cement (CEM II/B-S 42.5N) and H-CEMENT were used as binding components in the development of the concrete mixture designs. Both of these cements were produced by Považská cementáreň, a.s., Ladce. Attention was focused on testing the physical and mechanical properties of the developed concretes in various environments. An aqueous environment was selected as the first environment for the placement of test specimens (cubes with 150 mm edges and prisms with dimensions of 100 × 100 × 400 mm3) according to the ČSN EN 206-1 standard and the outdoor environment (August to October). The determination of the cube strength was made after 7, 28, and 90 days, the determination of the flexural and compressive strength was made at the end of the prisms, and the determination of the dynamic modulus of elasticity was made after 28 days on the prisms. The test results of the test specimens, which were placed in two environments, were compared and it was found that, after 90 days, the outdoor environment caused a decrease in the concrete’s strength characteristics when using Portland blended cement (CEM II/ B-S 42.5N) of about 8%; in contrast, when using H-CEMENT, the concrete’s strength increased by about 14%. The use of H-CEMENT and the addition of PUZZOLANIT in the amount of 30% in combination with CEM II/B-S 42.5N in the amount of 70% reduced the decrease in the strength of the concrete after 90 days by about 3%. The research results confirm the suitability of using H-CEMENT and the addition of PUZZOLANIT for the production of concrete based on steel slag (CSS) and air-cooled slag (ACBFS).

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13

Ogrodnik, Paweł, and Jacek Szulej. "Structural steel bond to concrete with waste aggregate." SHS Web of Conferences 57 (2018): 02007. http://dx.doi.org/10.1051/shsconf/20185702007.

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The article presents the results of bond tests of B500SP structural steel to concretes subjected to thermal stress. Concretes were designed purely on the basis on waste aggregate made of soft clay pottery with using two types of cements: Portland CEM 32.5R and aluminous cement Górkal 70. In the research was used the method of direct pulling the steel rod out of the concrete cover (Pullout Test). For the tests were prepared four types of concretes: two bases of aluminous cement and two on Portland cement without additions. In the remaining mixtures containing the additive in the form of clinoptilolite, the method of simple weight replacement of the selected type of cement with clinoptilolite in the amount of 10% was used. Mineral puzzolana additives are intended to modify the phase composition of hardened cement slurry towards reducing the portlandite and changing the CaO/SiO2 ratio in the C-S-H phase. The results of the tests confirmed that the bond of the selected steel type to concrete on the recycle aggregate does not differ from the results achieved with natural aggregate. It was also confirmed that addition of clinoptilolite to concrete with Portland cement has beneficial effect when it is subjected to thermal stress.

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14

Gürü, Metin, M. Korçak, Süleyman Tekeli, and Ahmet Güral. "Processing of Zinc-Based MgAl₂O₄ Composite and Effect of Fly Ash Addition." Key Engineering Materials 336-338 (April 2007): 1203–6. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1203.

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The properties of ceramic-metal (Cermet) composites as tensile strength, hardness and resistance to corrosion and high temperature are superior than ceramics and metals. Because of the enhanced characteristics of cermets, they are commonly used in various applications and industries. The main objective of this study is to produce a cheap, easy produced, strong and high corrosion resistant composite material. For these purposes, zinc is used for its natural capacity against corrosion, low density, low melting point and softness. Magnesium aluminates spinel oxide (MgAl2O4) is chosen because of its high melting point and low density. Fly ash is a waste from coal power plant having puzzolanic properties. In this study, the effect of various amounts of zinc and fly ash addition on density and hardness behaviour of zinc-based MgAl2O4 composites was investigated. The experimental results showed that zinc and fly ash addition improved the hardness behavior of zincbased MgAl2O4 composite.

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15

Dobrescu, Cornelia-Florentina, and Elena-Andreea Calarasu. "Engineering and environmental benefits of using construction wastes in ground improvement works." MATEC Web of Conferences 310 (2020): 00024. http://dx.doi.org/10.1051/matecconf/202031000024.

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One of the key emerging trends to protect the environment is to reuse wastes generated from construction and demolition sites for various engineering purposes. Many studies are being developed for setting up and optimize the potential of recycled construction wastes. The aim of the paper is to estimate the degree of improvement for resistance parameters of soil mixed with 5% and 10% of concrete and brick and water-based polymeric suspension used as stabilizer agent, as well as drywall waste mixed with 5% eco-binder with puzzolanic character. Multiple options of mixtures, predominantly composed by clay soils with swelling potential, have been investigated in laboratory conditions in terms of compression strength at 7, 14 and 28 days curing time and deformability. In order to emphasize distinct benefits of tested mixtures, a comparative analysis of the parametric values has been achieved. The experimental results revealed the suitability of using construction wastes to be assimilated with natural or conventional materials, which leads to significant improvements rates of geotechnical parameters. A large-scale implementation of this type of practice can substantially contribute to the achievement of sustainable development targets by reusing construction waste according to the specific objectives of engineering works in terms of structure safety.

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16

Talero, Rafael. "Cementos puzolánicos de mayor resistencia al ataque de aguas selenitosas que los cementos portland de elevada resistencia a las mismas, y viceversa." Materiales de Construcción 37, no. 207 (September 30, 1987): 37–50. http://dx.doi.org/10.3989/mc.1987.v37.i207.861.

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17

Ziegler, C. L. "Ursachen der Festigkeit alter römischer und gothischer Gebäude und die Mittel, gleiche Dauerhaftigkeit bei neuen Mauerwerken zu erhalten / Reasons for the strength of old Roman and Gothic buildings and ways how to achieve the same durability with new masonry." Restoration of Buildings and Monuments 6, no. 1 (February 1, 2000): 3–40. http://dx.doi.org/10.1515/rbm-2000-5445.

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Abstract The Preussian Royal Directorate for Finance, Military and Property has published the following prize question in 1775: in which way depends durability of Gothic and Roman masonry on time, on specific local conditions, on the stones and mortars used, and on the design, the execution and curing conditions? And how is new masonry to be built in order to achieve the same durability? The text which has been selected for this award is presented in full length in this contribution. First some observations made in Roman buildings are described. The observations are explained based on Roman literature on architecture and buildings. The durability of frequently used mortar and stones is discussed. The preparation of durable mortars is treated in detail. Different types of masonry are described. In conclusion it is stated that for external renderings and for mortars in masonry exposed to humid conditions cement mortar, i.e. mortar made with lime mixed with puzzolanas as a mineral binder, are to be applied exclusively. Internal renderings can be made with plaster of Paris or lime mortar. In an appendix it is pointed out that the thickness of a wall has a major influence on durability. In Holland durable and thin masonry walls are being built, however. This is possible because high quality cement mortars and bricks burnt at high temperature (clinkers) are used

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18

Fort, Jan. "PREPARATION OF PUZZOLANA ACTIVE TWO COMPONENT COMPOSITE FOR LATENT HEAT STORAGE." Ceramics - Silikaty, September 30, 2016, 291–98. http://dx.doi.org/10.13168/cs.2016.0044.

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19

Bascetin, A., D. Adiguzel, H. Eker, E. Odabas, and S. Tuylu. "Effects of puzzolanic materials in surface paste disposal by pilot-scale tests: observation of physical changes." International Journal of Environmental Science and Technology, August 17, 2020. http://dx.doi.org/10.1007/s13762-020-02892-w.

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20

Coloretti, Irene, Stefano Busani, Emanuela Biagioni, Sophie Venturelli, Elena Munari, Marco Sita, Lorenzo Dall'Ara, et al. "Effects of cytokine blocking agents on hospital mortality in patients admitted to ICU with acute respiratory distress syndrome by SARS-CoV-2 infection: retrospective cohort study." Multidisciplinary Respiratory Medicine 16 (May 17, 2021). http://dx.doi.org/10.4081/mrm.2021.737.

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Background: The use of cytokine-blocking agents has been proposed to modulate the inflammatory response in patients with COVID-19. Tocilizumab and anakinra were included in the local protocol as an optional treatment in critically ill patients with acute respiratory distress syndrome (ARDS) by SARS-CoV-2 infection. This cohort study evaluated the effects of therapy with cytokine blocking agents on in-hospital mortality in COVID-19 patients requiring mechanical ventilation and admitted to intensive care unit.Methods: The association between therapy with tocilizumab or anakinra and in-hospital mortality was assessed in consecutive adult COVID-19 patients admitted to our ICU with moderate to severe ARDS. The association was evaluated by comparing patients who received to those who did not receive tocilizumab or anakinra and by using different multivariable Cox models adjusted for variables related to poor outcome, for the propensity to be treated with tocilizumab or anakinra and after patient matching.Results: Sixty-six patients who received immunotherapy (49 tocilizumab, 17 anakinra) and 28 patients who did not receive immunotherapy were included. The in-hospital crude mortality was 30,3% in treated patients and 50% in nontreated (OR 0.77, 95% CI 0.56-1.05, p=0.069). The adjusted Cox model showed an association between therapy with immunotherapy and in-hospital mortality (HR 0.40, 95% CI 0.19-0.83, p=0.015). This protective effect was further confirmed in the analysis adjusted for propensity score, in the propensity-matched cohort and in the cohort of patients with invasive mechanical ventilation within 2 hours after ICU admission.Conclusions: Although important limitations, our study showed that cytokine-blocking agents seem to be safe and to improve survival in COVID-19 patients admitted to ICU with ARDS and the need for mechanical ventilation. *Modena Covid-19 Working Group (MoCo19): Intensive Care Unit: Massimo Girardis, Alberto Andreotti, Emanuela Biagioni, Filippo Bondi, Stefano Busani, Giovanni Chierego, Marzia Scotti, Lucia Serio, Annamaria Ghirardini, Marco Sita, Stefano De Julis, Lara Donno, Lorenzo Dall’Ara, Fabrizio Di Salvo, Carlotta Farinelli, Laura Rinaldi, Ilaria Cavazzuti, Andrea Ghidoni, Antonio Buono, Elena Ferrari, Daniela Iseppi, Anna Maria Ardito, Irene Coloretti, Sophie Venturelli, Elena Munari, Martina Tosi, Erika Roat, Ilenia Gatto, Marco Sarti.Immuno-Lab: Andrea Cossarizza, Caterina Bellinazzi, Rebecca Borella, Sara De Biasi, Anna De Gaetano, Lucia Fidanza, Lara Gibellini, Anna Iannone, Domenico Lo Tartaro, Marco Mattioli, Milena Nasi, Annamaria Paolini, Marcello Pinti. Infectious Disease Unit: Cristina Mussini, Giovanni Guaraldi, Marianna Meschiari, Alessandro Cozzi-Lepri, Jovana Milic, Marianna Menozzi, Erica Franceschini, Gianluca Cuomo, Gabriella Orlando, Vanni Borghi, Antonella Santoro, Margherita Di Gaetano, Cinzia Puzzolante, Federica Carli, Andrea Bedini, Luca Corradi. Respiratory Diseases Unit: Enrico Clini, Roberto Tonelli, Riccardo Fantini, Ivana Castaniere, Luca Tabbì, Giulia Bruzzi, Chiara Nani, Fabiana Trentacosti, Pierluigi Donatelli, Maria Rosaria Pellegrino, Linda Manicardi, Antonio Moretti, Morgana Vermi, Caterina Cerbone.Virology and Molecular Microbiology Unit: Monica Pecorari, William Gennari, Antonella Grottola, Giulia Fregni Serpini.

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