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Journal articles on the topic 'Alkaline cements'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Martín-Rodríguez, Pablo, Ana Fernández-Jiménez, María del Mar Alonso, Angel Palomo, and Inés García-Lodeiro. "Valorisation of “La Palma” Volcanic Ash for Making Portland-Blended, Alkaline and Hybrid Portland–Alkaline Cements." Materials 17, no. 1 (2024): 242. http://dx.doi.org/10.3390/ma17010242.

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The present work evaluates the feasibility of using volcanic fly ash (VFA) generated by the eruption of the Tajogaite volcano on the island of La Palma (Spain) in 2021, as a precursor in the preparation of cementitious materials with different Portland cement (PC) replacement levels (0%, 30%, 70% and 100%), in the absence (Blended Cement, BC) and presence of an alkaline activator (Hybrid Alkaline Cement, HAC, and Alkaline Cements, AC). Hydration kinetics (isothermal conduction calorimetry), paste mechanical strengths and reaction products were characterised by XRD, FTIR, TG/DTG and BSEM/EDX. T

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Oleksandr, Kovalchuk, Gelevera Oleksandr, and Ivanychko Vasyl. "STUDYING THE INFLUENCE OF METAKAOLIN ON SELF-HEALING PROCESSES IN THE CONTACT-ZONE STRUCTURE OF CONCRETES BASED ON THE ALKALI-ACTIVATED PORTLAND CEMENT." Eastern-European Journal of Enterprise Technologies 5, no. 6 (101) (2019): 33–40. https://doi.org/10.15587/1729-4061.2019.181501.

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This paper reports results from comparative testing the reaction "alkali ‒ active silica" in traditional Portland cement and alkaline Portland cement with the addition of metakaolin. The research is based on studying the process of structure formation in cements in the contact zone "cement stone – basalt". The research results allow us to conclude that the dynamics of the process of interaction of the reaction "alkali‒silica" in cements may be constructive and destructive in character. That depends on the content of components that are able to actively inter

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3

Krivenko, P. V., A. G. Gelevera, A. Yu Kovalchuk, and N. V. Rogozina. "DEPENDENCE OF WHITENESS OF DECORATIVE SLAG-ALKALINE CEMENT FROM THE CHEMICAL COMPOSITION OF BLAST-FURNACE SLAGS." Bulletin of Odessa State Academy of Civil Engineering and Architecture, no. 83 (June 4, 2021): 58–66. http://dx.doi.org/10.31650/2415-377x-2021-83-58-66.

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The construction industry is demanding more and more quality decorative cements. The demand for them and the requirements for their performance are constantly growing. But since decorative cements are based on white Portland cement, their production is associated with the disadvantages of the production of all clinker cements  low environmental friendliness, high energy consumption and high prices. They are not always able to provide decorative ecological and comfortable coatings with increased performance. In addition, many countries do not produce it and have to import it. An effective alte

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4

Portella, Fernando Freitas, Fabrício Mezzomo Collares, Paula Dapper Santos, et al. "Glycerol Salicylate-based Pulp-Capping Material Containing Portland Cement." Brazilian Dental Journal 26, no. 4 (2015): 357–62. http://dx.doi.org/10.1590/0103-6440201300218.

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<p>The purpose of this study was to evaluate the water sorption, solubility, pH and ability to diffuse into dentin of a glycerol salicylate-based, pulp-capping cement in comparison to a conventional calcium hydroxide-based pulp capping material (Hydcal). An experimental cement was developed containing 60% glycerol salicylate resin, 10% methyl salicylate, 25% calcium hydroxide and 5% Portland cement. Water sorption and solubility were determined based on mass changes in the samples before and after the immersion in distilled water for 7 days. Material discs were stored in distilled water

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Krivenko, Pavlo, Igor Rudenko, Oleksandr Gelevera, and Natalia Rogozina. "OBTAINING DECORATIVE ALKALINE-ACTIVATED CEMENT BY USING SLAGS WITH A HIGH CONTENT OF IRON OXIDE." Collected scientific works of Ukrainian State University of Railway Transport, no. 198 (May 12, 2022): 30–40. http://dx.doi.org/10.18664/1994-7852.198.2021.256531.

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Decorative cements have always been in high demand in the construction industryand the demand for them and the requirements for their performance are constantly growing. Butdecorative cements based on white clinker Portland cement have the same disadvantages astraditional Portland cement, namely: high energy intensity, low environmental friendliness, highprice. Not all countries produce it and have to import it, which further increases its cost. White clinkercements do not always provide sufficient stability of decorative and operational characteristics ofmaterials based on them. Therefore, an

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Oleksandr, Kovalchuk, and Zozulynets Viktoriia. "Development of alkaline concrete on the basis of active aggregates." Technology Audit and Production Reserves 6, no. 1(62) (2021): 36–42. https://doi.org/10.15587/2706-5448.2021.244780.

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<em>The object of the research is the process of directed structure formation in the body of alkaline concrete, made using a reactive aggregate, in this case, basalt, and the process of deformation development in such concrete. The problem with using reactive aggregates is that they cause alkaline corrosion. It manifests itself in the form of cracks and layers of gel-like substances that form at the point of contact of the aggregate with the cement stone.</em> <em>During the research, methods of physical and chemical analysis were used (X-ray phase, differential thermal and thermogravimetric a

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7

Shevchenko, Victor, and Galyna Kotsay. "Alkaline Factor in Cements with Glass Powder." Chemistry & Chemical Technology 11, no. 1 (2017): 99–104. http://dx.doi.org/10.23939/chcht11.01.099.

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8

Kovalchuk, Oleksandr, and Viktoriia Zozulynets. "Development of alkaline concrete on the basis of active aggregates." Technology audit and production reserves 6, no. 1(62) (2021): 36–42. http://dx.doi.org/10.15587/2706-5448.2021.244780.

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The object of the research is the process of directed structure formation in the body of alkaline concrete, made using a reactive aggregate, in this case, basalt, and the process of deformation development in such concrete. The problem with using reactive aggregates is that they cause alkaline corrosion. It manifests itself in the form of cracks and layers of gel-like substances that form at the point of contact of the aggregate with the cement stone. During the research, methods of physical and chemical analysis were used (X-ray phase, differential thermal and thermogravimetric analyzes, elec

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9

Salamanova, M. Sh, S. A. Yu Murtazaev, Z. H. Ismailova, and R. G. Bisultanov. "OBTAINING CLINKERLESS CEMENTS THROUGH THE SYNTHESIS OF BASIC SOLUTIONS OF SODIUM SILICATE FROM SILICA-CONTAINING ROCKS." Herald of Dagestan State Technical University. Technical Sciences 46, no. 3 (2019): 149–58. http://dx.doi.org/10.21822/2073-6185-2019-46-3-149-158.

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Objectives The creation of clinkerless cements that do not require high-temperature processing and significant natural resources, at the same time as exhibiting good technical parameters, seems to be an important research task. Cements of alkaline instillation, in which alkaline metals play an active role, are capable of interacting with minerals of aluminosilicate nature forming strong and insoluble compounds.Methods Concrete composites from binding substances activated by alkaline were developed on the basis of Russian and foreign experience of using cinder slag composites in construction.Re

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10

Oleksandr, Kovalchuk, Kochetov Gennadii, Samchenko Dmitry, and Kolodko Anton. "DEVELOPMENT OF A TECHNOLOGY FOR UTILIZING THE ELECTROPLATING WASTES BY APPLYING A FERRITIZATION METHOD TO THE ALKALINEACTIVATED MATERIALS." Eastern-European Journal of Enterprise Technologies 2, no. 10 (98) (2019): 27–34. https://doi.org/10.15587/1729-4061.2019.160959.

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The study reported in this paper reveals the effective way of recycling water treatment products by using them as a component of alkaline cements and concretes based on them. Large-scale utilization of products from waste water purification in the composition of building materials has traditionally been limited given that heavy metal compounds are included in the composition of waste. Materials that are created using such a waste are traditionally considered to be dangerous for human health and the environment. Application of alkaline cements as matrices for binding these wastes and related pr

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Teoh, Yu-Yao, Basil Athanassiadis, and Laurence Walsh. "Sealing Ability of Alkaline Endodontic Cements versus Resin Cements." Materials 10, no. 11 (2017): 1228. http://dx.doi.org/10.3390/ma10111228.

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12

Pye, K., and D. H. Krinsley. "Diagenetic carbonate and evaporite minerals in Rotliegend aeolian sandstones of the Southern North Sea: their nature and relationship to secondary porosity development." Clay Minerals 21, no. 4 (1986): 443–57. http://dx.doi.org/10.1180/claymin.1986.021.4.03.

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AbstractDeeply buried (> 3·5 km) Rotliegend aeolian sandstones in the Southern North Sea Basin display a number of interesting diagenetic features including (i) zoned iron-rich carbonate cements, (ii) anhydrite, halite and baryte cements, (iii) at least two generations of authigenic illite, and (iv) significant secondary porosity created by cement and framework-grain dissolution. The creation and destruction of secondary porosity is the result of changes in porewater chemistry during burial and subsequent uplift. Three pore-fluid regimes can be identified: (1) alkaline, oxidizing conditions

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13

Barboza-Chavez, Adriagni C., Lauren Y. Gómez-Zamorano, and Jorge L. Acevedo-Dávila. "Synthesis and Characterization of a Hybrid Cement Based on Fly Ash, Metakaolin and Portland Cement Clinker." Materials 13, no. 5 (2020): 1084. http://dx.doi.org/10.3390/ma13051084.

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Hybrid cement has become one of the most viable options in the reduction of CO2 emissions to the environment that are generated by the cement industry. This could be explained by the reduction of the content of clinker in the final mixture and substitution of the remaining percentage with supplementary cementitious materials with the help of an alkaline activation. Following that, properties that are provided by an Ordinary Portland Cement and of a geopolymer are mixed in this type of hybrid material and could be achieved at room temperature. Thereafter, the main objective of this research was

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14

ZOZULYNETS, Viktoriia, and Oleksandr KOVALCHUK. "EFFECT OF ADDITIONAL INPUT OF Na3PO4∙12H2O ON ACID RESISTANCE INDICATORS OF HYBRID ALKALINE CEMENTS." Building constructions. Theory and Practice, no. 12 (June 27, 2022): 65–72. http://dx.doi.org/10.32347/2522-4182.12.2023.65-72.

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This work is devoted to the study of the direct influence of phosphate salt, using theexample of trisodium phosphate (Na3PO4∙12H2O), on the acid resistance index of hybrid alkaliactivated cements. After all, acid resistance is becoming an increasingly important property for cement materials due to a wide range of applications where they are exposed to aggressive acid environments, especially in the chemical and foodindustries. In addition to the above, these include sewage systems, agricultural environments, oilwells, acid rain, and much more.Conventional Portland cement binders are known to b

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15

Valencia-Saavedra, William, Ana María Aguirre-Guerrero, and Ruby Mejía de Gutiérrez. "Assessment of the Corrosion of Steel Embedded in an Alkali-Activated Hybrid Concrete Exposed to Chlorides." Molecules 27, no. 16 (2022): 5296. http://dx.doi.org/10.3390/molecules27165296.

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Hybrid alkali-activated cements (HAACs), also known as cements with high percentages of alkali-activated supplementary materials, are alternative cements that combine the advantages of ordinary Portland cement (OPC) and alkali-activated systems. These cements are composed of a minimum of 70% precursor material and a maximum of 30% OPC mixed with an alkaline activator. This article evaluates the corrosion performance of reinforced HAAC concrete based on fly ash (FA) under exposure to chlorides (FA/OPC, 80/20). Its performance is compared with that of a binary alkali-activated cement (AAC) based

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16

Shagñay, Segundo, Leticia Ramón, María Fernández-Álvarez, Asunción Bautista, Francisco Velasco, and Manuel Torres-Carrasco. "Eco-Efficient Hybrid Cements: Pozzolanic, Mechanical and Abrasion Properties." Applied Sciences 10, no. 24 (2020): 8986. http://dx.doi.org/10.3390/app10248986.

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One of the most polluting industries is the cement industry and, for this reason, alternative lines of research recommend the use of substitute materials for traditional Portland cement. This study proposes the use of industrial (slag and fly ash) and ceramic wastes for the total or partial replacement of Portland cement in the manufacturing of both alkaline-activated and hybrid cements. To carry out this study and evaluate the behavior of the proposed materials, different mortars were manufactured: Portland cement (CEM I), two alkaline-activated slag systems and six hybrid systems, with an 80

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17

Omelchuk, Vladyslav, Guang Ye, Rayisa Runova, and Igor I. Rudenko. "Shrinkage Behavior of Alkali-Activated Slag Cement Pastes." Key Engineering Materials 761 (January 2018): 45–48. http://dx.doi.org/10.4028/www.scientific.net/kem.761.45.

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Nowadays, alkali-activated cements (AACs) are the most promising alternatives to ordinary portland cement (OPC). Such cements characterized by better strength and corrosion resistance that determine improved durability of materials based on them. However, the shrinkage of AAC systems is noticeably higher compared with OPC. The purpose of this work was to study the shrinkage behavior of alkali-activated slag cement (AASC) pastes. To improve early age performance of AASCs – OPC and Ca(OH)2, as mineral additives, were added to the designed cement mixtures. The properties, like, flexural and compr

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18

Gutiérrez-Orrego, Diego A., Maryory A. Gómez-Botero, and Edwin F. García. "Alkali-Activated Hybrid Cement from Mineral Wool Fiber Waste and OPC." Buildings 13, no. 2 (2023): 354. http://dx.doi.org/10.3390/buildings13020354.

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Cements to replace ordinary portland cement (OPC) are currently being studied due to the high environmental costs of OPC production. One viable alternative is alkali-activated cements, which can be made from pozzolanic materials such as stone wool fiber waste (SW). At present, SW is the most used insulation material in the world, and the disposal and recycling of it is an environmental challenge due to its fibrous nature and low density. In the present work, an alkali-activated cement (AAC) and an alkali-activated hybrid cement (AAHC) were obtained from the alkaline activation of SW. The uncon

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19

KRYVENKO, Pavlo, Volodymyr GOTS, Oleksandr GELEVERA, and Natalia ROGOZINA. "PERFORMANCE CHARACTERISTICS OF SLAG-ALKALI DECORATIVE CEMENTS AND MORTAR." Building constructions. Theory and Practice, no. 10 (June 27, 2022): 124–35. http://dx.doi.org/10.32347/2522-4182.10.2022.124-135.

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The use of slag-alkaline cements as decorative cements is quite promising. When using bleaching additives TiO2, kaolin and CaCO3, white cements with a degree of whiteness of 70...94%were obtained. But in addition to decorative properties, such cements and materials based on them are subject to requirements to ensure the necessary technological and operational properties.The article discusses the main operational properties of decorative slag-alkaline concrete mortars - long-term strength, water-holding capa-city of mixtures, resistance to fflorescence, resistance to steaming and exposure to at

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Garcia-Lodeiro, Ines, Ana Fernandez-Jimenez, and Angel Palomo. "Hybrid Alkaline Cements: Bentonite-Opc Binders." Minerals 8, no. 4 (2018): 137. http://dx.doi.org/10.3390/min8040137.

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21

Oliveira, Maria Carolina Guiotti de, Índia Olinta de Azevedo Queiroz, Thiago Machado, Lorena de Mello Alcântara Garrido, Sandra Helena Penha de Oliveira, and Marco Antonio Hungaro Duarte. "Effect of nonsteroidal anti-inflammatory drugs (NSAIDs) association on physicochemical and biological properties of tricalcium silicate-based cement." Brazilian Dental Journal 33, no. 3 (2022): 47–54. http://dx.doi.org/10.1590/0103-6440202204644.

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Abstract The aim of this study was to investigate the physicochemical and biological properties of an experimental tricalcium silicate-based repair cement containing diclofenac sodium (CERD). For the physicochemical test, MTA, Biodentine and CERD were mixed and cement disc were prepared to evaluate the setting time and radiopacity. Root-end cavity were performed in acrylic teeth and filled with cements to analyze the solubility up to 7 days. Polyethylene tubes containing cements were prepared and calcium ions and pH were measured at 3h, 24h, 72h and 15 days. For the biological test, SAOS-2 wer

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Medvecky, Lubomir, Maria Giretova, Radoslava Stulajterova, Tibor Sopcak, Pavlina Jevinova, and Lenka Luptakova. "Novel Biocement/Honey Composites for Bone Regenerative Medicine." Journal of Functional Biomaterials 14, no. 9 (2023): 457. http://dx.doi.org/10.3390/jfb14090457.

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New biocements based on a powdered mixture of calcium phosphate/monetite (TTCPM) modified with the addition of honey were prepared by mixing the powder and honey liquid components at a non-cytotoxic concentration of honey (up to 10% (w/v)). The setting process of the cements was not affected by the addition of honey, and the setting time of ~4 min corresponded to the fast setting calcium phosphate cements (CPCs). The cement powder mixture was completely transformed into calcium-deficient nanohydroxyapatite after 24 h of hardening in a simulated body fluid, and the columnar growth of long, need

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Wang, Hong Tao, Ming Xue, and Ju Hui Cao. "Research on the Durability of Magnesium Phosphate Cement." Advanced Materials Research 168-170 (December 2010): 1864–68. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1864.

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The Magnesium phosphate cement was prepared from MgO and NH4H2PO4. The changes of the strength, appearance and hydration products of the magnesium phosphate cement were investigated, which are soaked in sulfuric acid solution, sodium hydroxide solution, sodium sulfate solution and magnesium sulfate solution. Besides, the impermeability and salt frost resistance of magnesium phosphate cement were analyzed. The results show that magnesium phosphate cement has good resistance to sulfate erosion, especially the anti-corrosion ability of magnesium sulfate. However the alkali resistance of the magne

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Moreno de los Reyes, Ana María, José Antonio Suárez-Navarro, María del Mar Alonso, Catalina Gascó, Isabel Sobrados, and Francisca Puertas. "Hybrid Cements: Mechanical Properties, Microstructure and Radiological Behavior." Molecules 27, no. 2 (2022): 498. http://dx.doi.org/10.3390/molecules27020498.

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The use of more eco-efficient cements in concretes is one of the keys to ensuring construction industry sustainability. Such eco-efficient binders often contain large but variable proportions of industrial waste or by-products in their composition, many of which may be naturally occurring radioactive materials (NORMs). This study explored the application of a new gamma spectrometric method for measuring radionuclide activity in hybrid alkali-activated cements from solid 5 cm cubic specimens rather than powder samples. The research involved assessing the effect of significant variables such as

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Nalewajko, Marta. "Lightweight Concrete Manufacturing Technology Based on Waste Energy Raw Materials Alkaline-Activated." Key Engineering Materials 847 (June 2020): 155–60. http://dx.doi.org/10.4028/www.scientific.net/kem.847.155.

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This article focuses on the compression strength of lightweight concrete based on alkaline-activated waste materials. The problem is important not only because of the possibility of disposal of excessive amount of building or industrial waste, but also because of the decreasing amount of natural aggregate deposits. Apart from the problem of the decreasing amount of natural aggregate deposits, there is also a problem related to the emission of greenhouse gases from cement production processes. It is estimated that the synthesis of alkaline-activated composites is twice as energy-intensive as th

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Yong, David, Joanne Jung Eun Choi, Peter Cathro, et al. "Development and Analysis of a Hydroxyapatite Supplemented Calcium Silicate Cement for Endodontic Treatment." Materials 15, no. 3 (2022): 1176. http://dx.doi.org/10.3390/ma15031176.

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Aim: To develop an endodontic cement using bovine bone-derived hydroxyapatite (BHA), Portland cement (PC), and a radiopacifier. Methods: BHA was manufactured from waste bovine bone and milled to form a powder. The cements were developed by the addition of BHA (10%/20%/30%/40% wt), 35% wt, zirconium oxide (radiopacifier) to Portland cement (PC). A 10% nanohydroxyapatite (NHA) cement containing PC and a radiopacifier, and a cement containing PC (PC65) and a radiopacifier were also manufactured as controls. The cements were characterised to evaluate their compressive strength, setting time, radio

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27

Maher, Atari, Raquel Núñez-Toldrà, Neus Carrio, et al. "The Effect of Commercially Available Endodontic Cements and Biomaterials on Osteogenic Differentiation of Dental Pulp Pluripotent-Like Stem Cells." Dentistry Journal 6, no. 4 (2018): 48. http://dx.doi.org/10.3390/dj6040048.

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The aim of this study is to compare the osteogenic differentiation capacity of the dental pulp pluripotent-like stem cells (DPPSCs) using conditional media pretreated with ProRoot-MTA, Biodentine (BD) or the newly manufactured pure Portland cement Med-PZ (MZ). DPPSCs, isolated from human third molars, are the most relevant cell model to draw conclusions about the role of biomaterials on dental tissue regeneration. Cytotoxicity, alkaline phosphatase (ALP) activity, and calcium deposition analysis were evaluated at different differentiation time points. Gene expression of key osteogenic markers

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28

Cristelo, Nuno, Jhonathan Rivera, Tiago Miranda, and Ana Fernández-Jiménez. "Stabilisation of a Plastic Soil with Alkali Activated Cements Developed from Industrial Wastes." Sustainability 13, no. 8 (2021): 4501. http://dx.doi.org/10.3390/su13084501.

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The development of alternative materials for the construction industry, based on different types of waste, is gaining significant importance in recent years. This is mostly due to the need to increase sustainability of this heavily polluting activity, thus mitigating the dependence on, for instance, Portland cement. The present paper is related to the development of an alkaline activated cement (AAC) exclusively fabricated from industrial by-products (both precursor and activator). Coal combustion fly ash, a common residue from thermoelectric powerplants, and glass waste, from the manufacture

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Krivenko, P., and O. Kovalchuk. "MANAGING THE DECORATIVE PROPERTIES OF ALKALINE CEMENTS." Scientific Bulletin of Civil Engineering 96, no. 2 (2019): 280–85. http://dx.doi.org/10.29295/2311-7257-2019-96-2-280-285.

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Donatello, S., I. Garcia-Lodeiro, A. Fernandez-Jimenez, and A. Palomo. "Some durability aspects of hybrid alkaline cements." MATEC Web of Conferences 11 (2014): 01008. http://dx.doi.org/10.1051/matecconf/20141101008.

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Nahaev, M., M. Salamanova, and Z. Ismailova. "REGULARITIES OF THE PROCESSES OF FORMATION OF THE STRUCTURE AND STRENGTH OF A CLINKER-FREE BINDER OF ALKALINE ACTIVATION." Construction Materials and Products 3, no. 1 (2020): 21–29. http://dx.doi.org/10.34031/2618-7183-2020-3-1-21-29.

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resource- and energy-consuming Portland cement is currently considered the most popular material in the construction industry, but its production can be attributed to the category of harmful industries in terms of the amount of emissions into the environment. Therefore, the development of a clinker-free technology for the production of binders based on mineral fine powders of aluminosilicate nature activated by an alkaline coater is a relevant and promising direction. In the work, the laws of the processes occurring during the structure formation of clinker-free binder systems of alkalin

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Badalyan, Maria, Amalya Karapetyan, and Hovsep Hoveyan. "Physical-Chemical Studies of the Process of Condensation of a Clinker-Free Binder." Key Engineering Materials 906 (January 11, 2022): 47–52. http://dx.doi.org/10.4028/www.scientific.net/kem.906.47.

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The possibility of using a clinker-free binder as an alternative to expensive and energy-intensive Portland cement is being considered. The pozzolanizing effect of volcanic rocks is presented, where along with the binding of calcium hydroxide by silica to hydrosilicates, the binding of calcium hydroxide by “free” alumina to hydroaluminates also takes place. In the process of hardening of the clinker-free binder, the phase mineralogical composition of the formed new formations differs from the new formations that are synthesized during hardening of traditional Portland cement, which explains th

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Huang, Zi, Jiaoyue Wang, Longfei Bing, et al. "Global carbon uptake of cement carbonation accounts 1930–2021." Earth System Science Data 15, no. 11 (2023): 4947–58. http://dx.doi.org/10.5194/essd-15-4947-2023.

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Abstract. The main contributor to the greenhouse gas (GHG) footprint of the cement industry is the decomposition of alkaline carbonates during clinker production. However, systematic accounts for the reverse of this process – namely carbonation of calcium oxide and other alkaline oxides and/or hydroxides within cement materials during cements' life cycles – have only recently been undertaken. Here, adopting a comprehensive analytical model, we provide the most updated estimates of CO2 uptake by cement carbonation. The accumulated amount of global CO2 uptake by cements produced from 1930 to 202

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Razsamakin, A. V., V. I. Gots, I. I. Rudenko, and О. G. Gelevera. "THE ROLE OF CaCO3 IN THE FORMATION OF STRENGTH AND DECORATIVE PROPERTIES OF POWDER ALKALINE-ACTIVATED SLAG CEMENT CONCRETE." Modern construction and architecture, no. 9 (September 30, 2024): 71–81. http://dx.doi.org/10.31650/2786-6696-2024-9-71-81.

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The article discusses approaches to the formation of compositions of alkali-activated decorative Portland slag cements containing Portland cement type CEM1 5...45% with high performance and decorative properties. The optimization of the compositions of decorative alkali-activated Portland slag cements was carried out using statistical methods for designing experiments. Finely dispersed TiO2 and CaCO3 additives with a whiteness of 90% were used as bleaching components. The alkaline component is sodium metasilicate in the form of a non-hygroscopic powder. The research carried out made it possibl

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Salamanova, Madina, Dena Bataev, Aminat Uzayeva, and Zurab Gacayev. "Recipes of Knitting Systems Alkaline Activation Using Natural Raw Materials of the Chechen Republic." Materials Science Forum 1011 (September 2020): 1–7. http://dx.doi.org/10.4028/www.scientific.net/msf.1011.1.

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The alkaline clinker-free binders formulations activation development based on fine powders of aluminosilicate nature will allow to obtain the effective building composites. The paper reveals the issues related to the theoretical foundations of the cement stone structure and strength formation based on the alkaline activator. The research results, in our opinion, are undoubtedly of practical importance for the construction industry, since the proposed recipes for clinker-free cements will replace the expensive and energy-consuming Portland cement, allowing to create strong and durable concrete

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Iliushchenko, Valeriia, Lukáš Kalina, Martin Sedlačík, Vladislav Cába, Jiří Másilko, and Radoslav Novotný. "Effect of Alkali Salts on the Hydration Process of Belite Clinker." Materials 15, no. 10 (2022): 3424. http://dx.doi.org/10.3390/ma15103424.

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Belite-rich cement is a low carbon footprint binder. However, its use is accompanied by a low initial rate of hydration. This can be partially eliminated by grinding to a high specific surface or through the addition of admixtures (mineralizators or activators). The influence of alkaline activators CaSO4, Na2SO4 and Na2CO3 (in the amount of 5 wt.% related to the clinker weight) on the hydration course, as well as the quantity of hydration products in belite-rich cements, were investigated in this paper. Belite-rich clinker was laboratory-synthetized and ground together with activators to prepa

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Salamanova, M. "THE INFLUENCE OF ACTIVE MICROSILICA ADDITIVE ON BINDING PROPERTIES OF ALKALINE ACTIVATION." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 7, no. 1 (2022): 23–30. http://dx.doi.org/10.34031/2071-7318-2021-7-1-23-30.

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The world experience of implementation and the uniqueness of building alkaline composites prove the prospects and relevance of the development of clinker-free technology. The development of formulations of alkaline activation binders based on fine powders of aluminosilicate nature will allow obtaining new effective and high-quality products. The paper investigates the effect of active microsilica on the kinetics of strength gain, changes in density and pore space of cement stone, formulation and technological factors and hardening conditions. The chemical transformations of active silica under

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Kulikov, B. P., N. V. Vasyunina, I. V. Dubova, A. S. Samoylo, R. O. Balanev та A. S. Kutovaya. "Portland Сement Сlinker Production Using Synthetic Fluorite and Graphitic Carbon Based Additives". Ecology and Industry of Russia 27, № 10 (2023): 42–47. http://dx.doi.org/10.18412/1816-0395-2023-10-42-47.

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The efficiency results of synthetic mineralizers based on fluorite and graphite carbon for burning portland cement clinker were presented. Laboratory tests were carried out to obtain portland cement clinker using man-made alkaline mineralizers based on aluminum by-products. Physical and mechanical properties benchmark of test milling cements was carried out. Thermo-grav study results on individual raw slurry and sludge with a synthetic fluorite and graphitic carbon based mineralizers were presented. The oxidation of graphitic carbon in the composition of the mineralizer was analyzed.

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Schauwecker, Johannes, Mark Bock, Florian Pohlig, et al. "In vitro Growth Pattern of Primary Human Osteoblasts on Calcium Phosphate- and Polymethylmethacrylate-Based Bone Cement." European Surgical Research 58, no. 5-6 (2017): 216–26. http://dx.doi.org/10.1159/000470839.

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Background/Purpose: Polymethylmethacrylate (PMMA) and calcium phosphate (Ca-P) cements are widely used for arthroplasty surgery and augmentation of bone defects. However, aseptic implant loosening in absence of wear-induced osteolysis indicates an unfavourable interaction between the cement surface and human osteoblasts. Our underlying hypothesis is that cement surfaces directly modify cell viability, proliferation rate, and cell differentiation. Methods: To test this hypothesis, we examined primary human osteoblasts harvested from six individuals. These cells were pooled and subsequently seed

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Gennadii, Kochetov, Kovalchuk Oleksandr, and Samchenko Dmitry. "DEVELOPMENT OF TECHNOLOGY OF UTILIZATION OF PRODUCTS OF FERRITIZATION PROCESSING OF GALVANIC WASTE IN THE COMPOSITION OF ALKALINE CEMENTS." Eastern-European Journal of Enterprise Technologies 5, no. 10 (107) (2020): 6–13. https://doi.org/10.15587/1729-4061.2020.215129.

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A study of the products of ferritization processing of galvanic waste: sludge and spent process solutions is carried out. As a result of experiments on dynamic leaching of heavy metal ions, the immobilization properties of the sludge, obtained at different process parameters of ferritization are determined. It is shown that the level of immobilization of heavy metals in ferrite sludge after leaching is 99.96 wt % and in the sludge of traditional wastewater neutralization <97.83 wt %. The studies determine the possibility of reliable utilization of ferritized galvanic was

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KLEIN, CARLA, and ANA MARIA PIMENTEL MIZUSAKI. "Cimentação Carbonática em Reservatórios Siliciclásticos - O Papel da Dolomita -." Pesquisas em Geociências 34, no. 1 (2007): 91. http://dx.doi.org/10.22456/1807-9806.19465.

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Carbonates are important diagenetic cements in siliciclastic rocks thus important to determine these rocks as hydrocarbon reservoirs. The cement is the material had chemically precipitated partial or totally pore filling, affecting rock values of porosity and permeability. The acknowledgment of diagenetic patterns those are associated to the carbonatic cement precipitation and their impacts in the reservoirs quality can decrease the risks of exploration and exploitation of new reservoirs. Therefore is necessary the knowledge of origin and processes of carbonate cement’s precipitation. These ce

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Valencia-Saavedra, William, Rafael Robayo-Salazar, and Ruby Mejía de Gutiérrez. "Alkali-Activated Hybrid Cements Based on Fly Ash and Construction and Demolition Wastes Using Sodium Sulfate and Sodium Carbonate." Molecules 26, no. 24 (2021): 7572. http://dx.doi.org/10.3390/molecules26247572.

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This article demonstrates the possibility of producing alkali-activated hybrid cements based on fly ash (FA), and construction and demolition wastes (concrete waste, COW; ceramic waste, CEW; and masonry waste, MAW) using sodium sulfate (Na2SO4) (2–6%) and sodium carbonate (Na2CO3) (5–10%) as activators. From a mixture of COW, CEW, and MAW in equal proportions (33.33%), a new precursor called CDW was generated. The precursors were mixed with ordinary Portland cement (OPC) (10–30%). Curing of the materials was performed at room temperature (25 °C). The hybrid cements activated with Na2SO4 reache

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Mestieri, Leticia Boldrin, Ana Lívia Gomes-Cornélio, Elisandra Márcia Rodrigues, Gisele Faria, Juliane Maria Guerreiro-Tanomaru, and Mário Tanomaru-Filho. "Cytotoxicity and Bioactivity of Calcium Silicate Cements Combined with Niobium Oxide in Different Cell Lines." Brazilian Dental Journal 28, no. 1 (2017): 65–71. http://dx.doi.org/10.1590/0103-6440201700525.

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Abstract The aim of this study was to evaluate the cytotoxicity and bioactivity of calcium silicate-based cements combined with niobium oxide (Nb2O5) micro and nanoparticles, comparing the response in different cell lines. This evaluation used four cell lines: two primary cultures (human dental pulp cells - hDPCs and human dental follicle cells - hDFCs) and two immortalized cultures (human osteoblast-like cells - Saos-2 and mouse periodontal ligament cells - mPDL). The tested materials were: White Portland Cement (PC), mineral trioxide aggregate (MTA), white Portland cement combined with micro

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Živica, Vladimír, Martin T. Palou, and Martin Križma. "Geopolymer Cements and Their Properties: A Review." Building Research Journal 61, no. 2 (2015): 85–100. http://dx.doi.org/10.2478/brj-2014-0007.

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Abstract Concrete is the world's most versatile, durable and reliable construction material. Next to water, concrete is the second most used substance on earth and it requires large quantities of Portland cement. The industrial sector is the third largest source of man-made carbon dioxide emissions after the transportation sector as the major generator of carbon dioxide, which pollutes the atmosphere. Ordinary Portland cement (OPC) production produces the largest amount of carbon dioxide amongst all industrial processes. In addition to that a large amount of energy is also consumed for the cem

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Liu, Wenjuan, Zhiguang Huan, Min Xing, et al. "Strontium-Substituted Dicalcium Silicate Bone Cements with Enhanced Osteogenesis Potential for Orthopaedic Applications." Materials 12, no. 14 (2019): 2276. http://dx.doi.org/10.3390/ma12142276.

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Incorporating Sr element in biomaterials for bone implants is an effective way to improve their biological performance, as Sr element has been proved to enhance bone regeneration and depress bone resorption activity. In the present study, we developed a Sr-incorporated dicalcium silicate (C2S) bone cement as a potential candidate for bioactive self-setting bone cement in orthopaedics and stomatology. The Sr-C2S powders containing 0.3–6.8% Sr in molar ratio were prepared by means of chemical co-precipitation, and the results of XRD analysis indicated the incorporation of Sr element into the lat

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Saruta, Juri, Ryotaro Ozawa, Kosuke Hamajima, et al. "Prolonged Post-Polymerization Biocompatibility of Polymethylmethacrylate-Tri-n-Butylborane (PMMA-TBB) Bone Cement." Materials 14, no. 5 (2021): 1289. http://dx.doi.org/10.3390/ma14051289.

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Polymethylmethacrylate (PMMA)-based acrylic bone cement is commonly used to fix bone and metallic implants in orthopedic procedures. The polymerization initiator tri-n-butylborane (TBB) has been reported to significantly reduce the cytotoxicity of PMMA-based bone cement compared to benzoyl peroxide (BPO). However, it is unknown whether this benefit is temporary or long-lasting, which is important to establish given that bone cement is expected to remain in situ permanently. Here, we compared the biocompatibility of PMMA-TBB and PMMA-BPO bone cements over several days. Rat femur-derived osteobl

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Nurdin, Denny, Beactris Lamria Simanjuntak, Rahmi Alma Farah Adang, and Arief Cahyanto. "Hydroxyl ion release ability from mixture of Indonesian White Portland Cements - Bi2O3 - Light Cured Methacrylate Based Resin as a Potential Pulp Capping Material." Padjadjaran Journal of Dentistry 35, no. 1 (2023): 29. http://dx.doi.org/10.24198/pjd.vol35no1.43207.

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ABSTRACTIntroduction: The bioactivity property of pulp capping materials is determined by the hydroxyl ion release ability, which may alter the environmental pH to become alkaline. Calcium silicate-based materials are antibacterial, able to induce reparative dentin and have a good bacteria-tight seal. The poor handling of calcium silicate-based materials can be overcome by adding resin, so the materials will be easier to handle. Therefore, the purpose of this study was to synthesize a mixture of Indonesian White Portland Cements - Bi2O3 – UDMA and analyzed its hydroxyl ion release ability. Met

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Salamanova, M., M. Nahaev, and B. Sarsenbaev. "DEVELOPMENT OF SPECIAL RECIPES OF BINDING COMPOSITIONS WITH IMPROVED PROPERTIES." Construction Materials and Products 3, no. 4 (2020): 5–12. http://dx.doi.org/10.34031/2618-7183-2020-3-4-5-12.

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the ecological safety of earthly civilization suffers from the accumulation of huge volumes of industrial waste, the natural resource potential is decreasing, therefore, special attention is paid to the development of less costly and low energy-intensive technologies for obtaining new building materials, the implementation of which does not require high-temperature and expensive technological processing, and will allow the use of secondary and substandard raw materials. The work presents the results of the development of special formulations of binder compositions of alkaline activation

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Vlachakis, Christos, Marcus Perry, and Lorena Biondi. "Self-Sensing Alkali-Activated Materials: A Review." Minerals 10, no. 10 (2020): 885. http://dx.doi.org/10.3390/min10100885.

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Alkali-activated materials are an emerging technology that can serve as an alternative solution to ordinary Portland cement. Due to their alkaline nature, these materials are inherently more electrically conductive than ordinary Portland cement, and have therefore seen numerous applications as sensors and self-sensing materials. This review outlines the current state-of-the-art in strain, temperature and moisture sensors that have been developed using alkali activated materials. Sensor fabrication methods, electrical conductivity mechanisms, and comparisons with self-sensing ordinary Portland

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Zozulynets, V., and O. Kovalchuk. "Prospects of development of acid–resistant hybrid cements on the basis of alkaline–activated binders." Ways to Improve Construction Efficiency 1, no. 50 (2022): 15–21. http://dx.doi.org/10.32347/2707-501x.2022.50(1).15-21.

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Quite often during operation, construction products and structures are exposed to aggressive environments, which leads to a decrease in their physical and mechanical characteristics and durability in general. To date, there is a wide range of options for eliminating the effects of structural failure, and new recommendations are being developed to prevent destructive processes that take place in the body of artificial cement stone. The issue of improving the acid resistance of building materials is no exception. Unfortunately, the existing acid–resistant materials, although characterized

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