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Dissertations / Theses on the topic 'Alkaline cements'

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Published: 28 May 2022
Last updated: 31 July 2025

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1

Pavel, Krivenko, Kovalchuk Georgiy, Kovalchuk Olexandr, and Grabovchak Valentina. "Alkaline Fly-Ash Cements and concretes, influence of care on early stage of hardening." Thesis, Non-Traditional Cement & Concrete IV Brno, 2011. http://er.nau.edu.ua/handle/NAU/9432.

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There are a lot of not well investigated processes in alkaline fly-ash cement technology. Among them the role o f fly-ash type and type o f alkaline component in structure formation processes in different stages, new phases formation and connected with this properties of cements and concretes, including corrosion resistant, durability and other. It was necessarry to investigave influence of concrete care curing, humidity temperature on properties of fly ash-alkaline concrete, on their early stage strength, stability and possibility to self-destruction.Also, it is important to now about strengt
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Дашкова, Т. С., І. В. Глуховський та В. В. Глуховський. "Ніздрюваті бетони на основі доменних гранульованих шлаків". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/66533.

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Роботою передбачено розробку принципово нової ефективної технології виробництва стінових матеріалів ніздрюватої структури на основі багатотоннажних відходів металургійного виробництва – доменних гранульованих шлаків.
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3

Rodrigues, Thaisângela. "Análise da regulação de genes associados ao metabolismo do fosfato em células da polpa e ligamento periodontal e suas associações na regeneração periodontal = estudo "in vitro" e "in vivo"." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289034.

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Orientadores: Francisco Humberto Nociti Junior, Karina Gonzales Silvério Ruiz<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba<br>Made available in DSpace on 2018-08-17T15:11:27Z (GMT). No. of bitstreams: 1 Rodrigues_Thaisangela_D.pdf: 14210209 bytes, checksum: 51042175513bdc9b288a951af21a21ac (MD5) Previous issue date: 2011<br>Resumo: A formação deficiente do cemento acelular sobre a raiz dentinária de pacientes com hipofosfatasia (HPP) elucida a importância da expressão local da enzima fosfatase alcalina (TNAP) durante a cementogênese. Os obj
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4

Kulasuriya, Chandana. "Alkali Pozzolan Cement for Integral Sustainability." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/610.

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This thesis presents the design and development of an alternative cement called ‘Alkali Pozzolan Cement’ (APC) for ‘integral sustainability’. The term ‘integral sustainability’ is a philosophical concept that implies an integration of not only the aspects related to ecological sustainability, but also those of technological, economic and social sustainability. Accordingly, this research can be considered as engineering as well as philosophical research; hence, mixed research methods were adopted to achieve the research objectives.
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Ke, Xinyuan. "Improved durability and sustainability of alkali-activated slag cements." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/17557/.

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This study established the fundamental relationships between slag chemistry and reaction kinetics of sodium carbonate-activated slag. The application of the smart chemical addition CLDH for sodium carbonate-activated slag based on the understanding of slag chemistry, has not only made the sodium carbonate activator a plausible option for implementation, but more of a better option with performance advantages. The knowledge developed in this study about the ionic interaction between chlorides and individual reaction product filled in gaps in literature, and becomes a useful tool whose usage is
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6

Canham, Ian. "The control of alkali silica reaction using blended cements." Thesis, Aston University, 1987. http://publications.aston.ac.uk/9726/.

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It has been previously established that alkali silica reaction (ASR) in concrete may be controlled by blending Portland cement with suitable hydraulic or pozzolanic materials. The controlling mechanism has been attributed to the dilution of the cement's alkali content and reduced mobility of ions in concrete's pore solution. In this project an attempt has been made to identify the factors which influence the relative importance of each mechanism in the overall suppression of the reaction by the use of blended cements. The relationship between the pore solution alkalinity and ASR was explored b
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7

Halaweh, Mahmoud. "Effect of alkalis and sulfates on Portland cement systems." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0002120.

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8

Springfield, Tyler. "Application of FTIR for Quantification of Alkali in Cement." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc84280/.

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Alkali-silica reaction (ASR) in cement is a major contributor to failure of cement structures around the world, causing increased repair costs and possible rebuild expenses. Alkali levels are indicative of the potential for ASR and are therefore measured and quantified. A linear correlation relating cement alkali concentration measured by X-ray fluorescence spectroscopy (XRF) and peak ratio measured by Fourier transform infrared spectroscopy (FTIR) is developed. Regression analysis of plots correlating alkali content measured by FTIR absorption band (750 cm-1/923 cm-1) ratio versus equivalent
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9

Sakulich, Aaron Richard Barsoum M. W. "Characterization of environmentally-friendly alkali activated slag cements and ancient building materials /." Philadelphia, Pa. : Drexel University, 2010. http://hdl.handle.net/1860/3209.

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10

Li, Zihui. "Acid Leaching Resistance and Alkali Silica Reaction (ASR) of Alkali-Activated Cement Free Binders." Thesis, Clarkson University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10640300.

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<p> Recently, increased awareness of the significance of developing sustainable materials for construction has renewed the interest in exploring Alkali activated concrete (AAC), a concrete that contains no cement, but only industrial by-products such as fly ash and slag, as a low energy alternative to the conventional concrete. Although the feasibility of making alkali&ndash;activated concrete with acceptable strength and mechanical properties is well documented, the information regarding the long-term durability, including resistance to acid attack and alkali silica reaction (ASR), is far fro
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11

Thibodeaux, Kristin. "Alkali-silica reaction in oilwell cement slurries using hollow glass spheres." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/19288.

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12

Freeman, Gregory Edward. "Low Temperature Calorimetry and Alkali-Activated Slags." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-theses/1181.

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The American Society of Civil Engineers’ (ASCE’s) “2013 Report Card for America’s Infrastructure” estimated that “32% of America’s major roads are in poor or mediocre condition.” An estimated $100 billion dollars are needed to maintain that condition, and an additional $79 billion is needed to improve the quality of American roadways to an acceptable level. In many regions around the US, the service lives of concrete pavements are limited by the damage caused by freezing and thawing of pore solution inside the pavements. Alkali-activated slags (AAS) are produced from ground granulated blast fu
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13

Touma, Wissam Elias. "Alkali-silica reaction in Portland cement concrete : testing methods and mitigation alternatives /." Digital version accessible at:, 2000. http://wwwlib.umi.com/cr/utexas/main.

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14

Bondar, Dali. "Alkali activation of Iranian natural pozzolans for producing geopolymer cement and concrete." Thesis, University of Sheffield, 2009. http://etheses.whiterose.ac.uk/14553/.

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The challenge for the civil engineering community in the near future will be to realize the building of structures in harmony with the concept of sustainable development, through the use of high performance materials which have low environmental impact and can be produced at reasonable cost. Geopolymers are novel binder materials that could provide a route towards this objective. Although research on geopolymer has advanced, most of the previous research conducted on geopolymers has dealt with pastes and concentrated on the material's chemistry and microstructure. There is little information a
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15

Oberlink, Anne Elizabeth. "NON-PORTLAND CEMENT ACTIVATION OF BLAST FURNACE SLAG." UKnowledge, 2010. http://uknowledge.uky.edu/gradschool_theses/25.

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The purpose of this project was to produce a “greener” cement from granulated ground blast furnace slag (GGBS) using non-Portland cement activation. By eventually developing “greener” cement, the ultimate goal of this research project would be to reduce the amount of Portland cement used in concrete, therefore reducing the amount of carbon dioxide emitted into the atmosphere during cement production. This research studies the behavior of mineral binders that do not contain Portland cement but instead comprise GGBS activated by calcium compounds or fluidized bed combustion (FBC) bottom ash. The
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16

Safari, Samira. "Early-age mechanical properties and electrical resistivity of geopolymer composites." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13379.

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Cement-less and/cement-like geopolymer mortars were made with pulverised fuel ash (PFA) or ground granulated blast furnace slag (GGBS) activated by alkali with different alkali moduli (AM) and alkali dosage (AD). Once synthesised the samples were cured at 20°C and 70°C up to 28 days. The flexural and compressive strengths of these samples at early ages up to 28 days were tested conforming to BS EN196-1:2005. The electrical resistivity of these materials was monitored using a set of non-contacting electrodes to the age up to 7 days to characterise the geopolymerisation process from a physical p
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17

Radonjic, Mileva. "Application of surface analysis in a study of the mechanism of alkali-carbonate reaction in concrete." Thesis, University of Bristol, 1999. http://hdl.handle.net/1983/17a20752-0cde-492a-ac12-5e82b7cfc844.

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18

Zografou, Adamantia. "The use of china clay waste as a construction material using alkali-activated cement technology." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687353.

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Every 1 t of china clay produced in the UK generates 9 t of waste material. A limited quantity of the coarser waste has beneficial use as a building stone or secondary aggregate in concrete and asphalt, but there are currently limited uses for the finest waste fraction. ‘Mica’ waste is a mixture of fine minerals and is one of the forms of waste with little beneficial use other than the restoration of old quarries. Looking for innovative solutions for the needs of a new Eco-town in the UK and with an aim to find new commercially viable and low environmental impact uses in construction, this PhD
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19

Rojas, Clemente Shirley Melanie. "Optimization of the alkaline treatment for Agave americana fiber and its influence on the mechanical properties of fly ash-based geopolymer." Bachelor's thesis, Pontificia Universidad Católica del Perú, 2021. http://hdl.handle.net/20.500.12404/20157.

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Geopolymers are good alternatives for replacing ordinary Portland cement (OPC) due to their comparable properties and feasibility to be obtained from industrial by-products. As OPC, geopolymers have superior compressive strength but a brittle behavior that the addition of fibers can improve. When the first macrocrack appears, fibers develop bridging mechanisms to allow the proper distribution of loads, so the composite can enable multiple cracks and enhance its ductility. At present, a wide range of materials can be used to reinforce cementitious matrices, from synthetics such as steel,
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20

CLAUSI, MARINA. "Alkali activated materials as alternative binders for the built heritage: study of their interaction with ornamental stones in mortars, composites and cements." Doctoral thesis, Università degli studi di Pavia, 2016. http://hdl.handle.net/11571/1203276.

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La ricerca condotta ha riguardato lo studio di leganti, malte, materiali compositi e cementi a base di precursori alluminosilicatici attivati alcalinamente, valutandone l’idoneità in campo strutturale e nel particolare contesto della conservazione e ripristino del patrimonio culturale. E’ stata inoltre studiata l’interazione e l’uso sinergico degli AAMs con materiali lapidei naturali e artificiali. Sono stati prodotti leganti geopolimerici impiegando un caolino naturale di alto grado (73% caolinite e 27% quarzo) trattato termicamente a 800°C per due ore e silicato di sodio. Modificando il rap
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21

Solik, Jaroslav. "Možnosti využití slévárenských odprachů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-216871.

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This thesis explores the posibility of using of foundry filter ash for production of inorganic composite materials, that could be used primary in the construction industry. The thesis is divided into theoretical and experimental section, where theoretical section contain literature review of used materials and the experimental section summarizes the results of laboratory tests performed on tested mixture based on portland and alumina cement with various content of foundry filter ash. For comparison was also used another foundry waste - foundry sand. Prepared test bodies with dimension of 40 x
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22

Schäfer, Elke. "Einfluss der Reaktionen verschiedener Zementhauptbestandteile auf den Alkalihaushalt der Porenlösung des Zementsteins /." Düsseldorf : Verl. Bau und Technik, 2006. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014938724&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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23

Bradová, Lada. "Studium alkalicko křemičité reakce v hybridních systémech." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414119.

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This study evaluates question of alkali–silica reaction (ASR) in hybrid system, which was designed in the bachelor's thesis, to meet the requirements of EN 197-1 and classified to the Blastfurnace CEM III/C cements. The durability of this system is a great unknown. For this reason, the same methods (ASTM C1260, ASTM C289 and ASTM C856) were used to observer the ASR effects as the ones used to observer the Portland cement based concrete. Supplementary methods include determination of compressive strengths according to EN 196-2 and scanning electron microscopy to observe the microstructure. Hybr
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Mohelská, Lucie. "Modifikace betonových prvků pro chladicí věže." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2013. http://www.nusl.cz/ntk/nusl-216998.

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This master´s thesis deals with the suppression of the growing of algae in cooling towers. Subject of the work is suggestion and testing surface modification of the existing mature concrete in order to suppress the growth of algae. In the frame surface modification, several commercially available and newly developed systems were tested. Testing systems are based on the basis of portland cement, geopolymers or formation of insoluble complex compounds containing metal elements (Zn, Cu). Experimental methods were applied in the real environment of cooling towers of Dukovany Nuclear power plant.
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25

Grellier, Adèle. "Des fines de brique de terre cuite comme liants de substitution dans les ciments et les matériaux alcali-activés." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2020. http://www.theses.fr/2020MTLD0013.

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L’industrie de la construction produit aujourd’hui une quantité énorme de déchets, plus particulièrement lors de la déconstruction et la démolition de bâtiments. La brique, objet de notre étude, représente une part importante de ces déchets inertes dans certaines régions comme le Nord de la France et la Belgique. Le recyclage des briques est déjà réalisé sous forme de granulats utilisés notamment dans les remblais routiers. Mais cela constitue ce que l’on appelle une opération de « downcycling ». La voie investiguée est une valorisation à plus forte valeur ajoutée via l’élaboration de liants h
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Chen-Tan, Nigel W. "Geopolymer from a Western Australian fly ash." Thesis, Curtin University, 2010. http://hdl.handle.net/20.500.11937/1900.

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Ordinary Portland cement is utilised worldwide as a mainstay construction material. Worldwide consumption of cement in 2009 was estimated to be 2.8 billion tonnes, which unfortunately equates to the production of 2.8 billion tonnes of CO[subscript]2 via the sintering procedure required to produce cement clinkers. With worldwide concern over climate change, this value is a substantial contribution to greenhouse gas emission.Fly ash is a by-product of coal combustion from thermoelectric power stations. World production of fly ash was estimated at 600 million tonnes with only 9% utilisation (Kaya
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Bílek, Vlastimil. "Možnosti využití odpadních písků z výroby vodního skla ve stavebnictví." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2013. http://www.nusl.cz/ntk/nusl-216992.

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Nowadays, the waste sands from the water glass production have no utilization and due to high alkali content are considered as a dangerous waste. So the aim of this thesis is to find and study some possibilities of their utilization in the building industry. First of all, some necessary analysis of these sands were performed and then some advantages and disadvantages of their application for production of materials based on portland cement and alkali activated materials were studied. Characteristics of fresh and hardened pastes, mortars and concretes containing these waste sands were determine
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28

Kim, Byung-Gi. "Compatibilité entre les ciments et les superplastifiants dans les bétons à haute performance : influence de la teneur en alcalis du ciment et de la masse molaire du PNS sur les propriétés rhéologiques des pâtes de ciment et des bétons Compatibility between cements and superplasticizers in high-performance concrete : influence of alkali content in cement and of the molecular weight of PNS on the properties of cement pastes and concretes." Sherbrooke : Université de Sherbrooke, 2000.

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Shearer, Christopher R. "The productive reuse of coal, biomass and co-fired fly ash." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52298.

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Stricter greenhouse gas emission limits and renewable energy requirements are expected to further increase the worldwide practices of firing biomass and co-firing biomass with coal, which are both considered more sustainable energy sources than coal-only combustion. Reuse options for the by-products of these processes -biomass ash and co-fired fly ash -remain limited. Therefore, this research examines their use as supplementary cementitious materials (SCMs) in concrete and as precursors for alkali-activated geopolymers. Toward their potential use as an SCM, after characterizing these ashes as
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Kalina, Lukáš. "Syntéza aluminátosilikátových systémů na bázi geopolymerů orientovaná na využívání sekundárních surovin." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-233335.

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Portland cement-based products are the most commonly used building materials. However, it is well known that the production of OPC not only consumes a significant amount of natural resources and energy but also releases high quantity of carbon dioxide (CO2) to the atmosphere. Purpose of this work is to develop new cementitious material similar to Portland cement-based concrete, which is convenient in terms of energy and is environmental-friendly at once. This work presents preparation, composition and properties of inorganic aluminosilicate polymer, called geopolymer, synthesized from blast fu
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Bernard, Ellina. "Magnesium silicate hydrate (M-S-H) characterization : temperature, calcium, aluminium and alkali." Thesis, Bourgogne Franche-Comté, 2017. http://www.theses.fr/2017UBFCK025/document.

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Les différentes options envisagées par la France et la Suisse pour le stockage de déchets radioactifs en couches géologiques profondes argileuses prévoient l’utilisation d’importants volumes de matériaux cimentaires. Les liants dits bas-pH ont été développés afin de limiter la perturbation de la roche encaissante par le panache alcalin. Les études expérimentales menées sur les interfaces béton bas-pH-argile mettent systématiquement en évidence la formation de phases silico-magnésiennes, potentiellement de silicate de magnésium hydraté (M-S-H), mal modélisées à cause de données thermodynamiques
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Neto, Antonio Acácio de Melo. "Estudo da retração em argamassa com cimento de escória ativada." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-05022003-114904/.

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O uso de escória de alto forno como aglomerante alternativo ao cimento portland tem sido objeto de vários estudos no Brasil e no exterior. Além de representar vantagens ao meio ambiente por ser um resíduo, a escória apresenta boas possibilidades de emprego, principalmente pelo baixo custo e por suas vantagens técnicas das quais se destacam a elevada resistência mecânica, a boa durabilidade em meios agressivos, o baixo calor de hidratação. No entanto, o emprego deste material carece de estudos detalhados da retração, muito superior à do cimento portland. Este trabalho teve como objetivo estudar
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Tavares, Pedro Américo Curvelo. "Influência do teor de álcalis do cimento na interacção cimento-adjuvante." Master's thesis, Universidade de Évora, 2011. http://hdl.handle.net/10174/11517.

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Nas últimas décadas tem-se assistido a um enorme avanço na área de estudo dos betões, no desenvolvimento de betões com características e propriedades específicas, tais como os betões de alta performance, betões auto compactantes, etc. Para o desenvolvimento destes betões otimizados, caracterizados por apresentarem muito baixa razão água cimento (A/C), os adjuvantes orgânicos, mais concretamente os superplastificantes, têm possuído uma posição de destaque devido á sua capacidade otimizar as propriedades dos betões. Nesta dissertação foi elaborado um plano de ensaios caracterizadores da influênc
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Kiventerä, J. (Jenni). "Stabilization of sulphidic mine tailings by different treatment methods:heavy metals and sulphate immobilization." Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526223964.

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Abstract Millions of tons of mine tailings are generated worldwide annually. Since many valuable metals such as Ag, Cu, Pb, Zn, Au and Ni are usually incorporated into sulphidic minerals, a large proportion of the tailings generated contain high amounts of sulphates and heavy metals. Some of these tailings are used as paste backfill material at mining sites, but large amounts are still being deposited into the tailings dams under water coverage. Sulphidic minerals are stable underground but after mining of the ore and several processing steps these minerals can be oxidized when they come into
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Kiiashko, Artur. "Amélioration des propriétés rhéologiques et à jeune âge des laitiers alcali-activés au carbonate de sodium." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN033.

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Aujourd'hui, les problèmes environnementaux sont plus graves que jamais. Des mesures urgentes devraient être prises dans tous les domaines de l'activité humaine, y compris la construction. L'un des principaux contributeurs à l'impact négatif de cette industrie sur l'environnement est la fabrication du ciment Portland ordinaire (OPC) nécessaire à la production de béton et d’autres matériaux cimentaire. Malgré son importance, il présente un inconvénient important: sa production est accompagnée par de grandes quantités de gaz à effet de serre. Ils représentent 5 à 8% des émissions mondiales total
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Bonsembiante, Francieli Tiecher. "Reação álcali-agregado : avaliação do comportamento de agregados do sul do Brasil quando se altera o cimento utilizado." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/8021.

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A reação química que ocorre entre os hidróxidos alcalinos presentes nos poros do concreto e alguns minerais constituintes dos agregados tem causado sérios danos às estruturas. Até o presente momento a prevenção é a melhor forma de evitar que a reação se desencadeie, uma vez que as soluções remediativas ainda necessitam de estudos mais aprofundados para serem implementadas. Neste sentido, a utilização de adições pozolânicas no concreto tem se mostrado uma alternativa eficaz, sendo que a forma mais fácil de empregá-las é através do uso de cimentos compostos com adições. Porém, são poucos os estu
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Fialová, Barbora. "Rehydratace alkalicky aktivované strusky po vysokoteplotním namáhání." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-239940.

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Ground granulated blast furnace slag is a by-product of the steel industry and is often used in combination with ordinary Portland cement as a binder in concrete. When concrete is exposed to high temperatures, physical and chemical transformations lead to significant loss of mechanical properties. This study aims to investigate the effect of high temperatures and rehydration on the mechanical properties, microstructure and phase composition of alkali activated slag. The results of the research could make an important contribution to decisions made concerning the reconstruction of structures af
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Trindade, Guilherme Hoehr. "Influência da incorporação de cinza da casca do arroz e sílica ativa no cimento Portland frente à reação álcali-sílica : desenvolvimento de uma nova proposta de método para avaliação da RAS em materiais suplementares ao cimento Portland." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/131343.

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Alguns materiais, constituídos quase que exclusivamente por sílica, são empregados, de forma suplementar ao cimento Portland, por promoverem melhorias ao concreto, devido aos seus efeitos físicos e pozolânicos, além de atenderem a questões ambientais. No entanto, essa sílica pode gerar produtos indesejados na presença de álcalis, sendo este fenômeno conhecido como reação álcali sílica (RAS). Na presença de água, esses produtos são capazes de expandir no interior da massa de concreto, provocando fissuras internas e externas e, em casos mais graves, a degradação do elemento estrutural. Com a fin
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39

Камінський, Андрій Тарасович. "Ремонтні суміші з підвищеними експлуатаційними властивостями на основі лужного портландцементу". Diss., Національний університет "Львівська політехніка", 2021. https://ena.lpnu.ua/handle/ntb/56764.

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40

Bayer, Petr. "Použitelnost ložového popele z vitrifikovaného lignitového uhlí v kompozitních cementech." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2014. http://www.nusl.cz/ntk/nusl-217052.

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Předložená magisterská práce se zabývá možným použitím vitrifikovaného lignitového lóžového popele jako náhrada slinku v kompozitních cementech. Byly zkoumány vlivy přidaného vitrifikovaného lóžového popele, jeho jemnosti, alkalických roztoků a jejich koncentrací. Byly připraveny kompozitní cementy v souladu s normou DIN EN 197 – 1. V těchto cementech bylo nahrazeno 30 % slinku vitrifikovaným lóžovým popelem. Konkrétně byly připraveny kompozitní cementy s vitrifikovaným lóžovým popelem o jemnosti 5549 cm2/g a 8397 cm2/g. Dále byly přidány alkalické roztoky hydroxidů a síranů vždy o dvou různýc
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41

Munhoz, Flávio André da Cunha. "Efeito de adições ativas na mitigação das reações álcali-sílica e álcali-silicato." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3146/tde-10012008-100734/.

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A reação álcali-agregado é uma manifestação patológica diretamente ligada à seleção dos materiais (cimento, agregados miúdo e graúdo, água e aditivos) que pode comprometer a durabilidade das estruturas de concreto, uma vez que a interação desses materiais e as condições ambientais é que vão conferir ao concreto determinadas propriedades ligadas à sua vida útil. A reação entre os hidróxidos alcalinos solubilizados na fase líquida dos poros dos concretos e alguns agregados reativos é lenta e resulta em um gel que, ao se acumular em vazios do concreto e na interface pasta-agregado, na presença de
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42

Kleib, Joelle. "Ecoconception des ciments : synthèse, hydratation et durabilité." Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2018. http://www.theses.fr/2018MTLD0009/document.

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Les ciments sulfoalumineux sont des liants hydrauliques qui, jusqu’aujourd’hui ne sont pas normalisés et ne possèdent donc pas une composition fixe. La teneur en ye’elimite – la phase principale de ce ciment- peut varier de 5 à 70 %. Or la composition du ciment sulfoalumineux (la composition du clinker ainsi que le pourcentage de gypse ajouté) est un paramètre critique qui contrôle sa réactivité, ses performances mécaniques, ainsi que sa durabilité. L’objectif principal de cette thèse est donc l’étude de l’influence de la composition des ciments sulfoalumineux sur leurs propriétés techniques,
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43

Hoduláková, Michaela. "Experimentální ověření modulu pružnosti v tlaku jemnozrnných kompozitů na bázi silikátových pojiv." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265508.

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Since their inception, building materials are constantly improving. New ways to explore and improve the material's properties are constantly investigated (especially to improve the mechanical and deformation characteristics of the materials). This thesis is focused on identifying and comparing values of the modulus of elasticity of fine-grained composites. These features are compared with respect to water cement ratio, ageing and compressive strength of the investigated materials. Afterwards, the values of the modulus of elasticity are studied in the relation to the tested materials.
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44

Lima, Junior Luiz Cezar Miranda de. "O USO DO VIDRO RECICLADO COMO PRECURSOR DE SISTEMAS CIMENTANTES GEOPOLIMÉRICOS." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2016. http://tede2.uepg.br/jspui/handle/prefix/1480.

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Made available in DSpace on 2017-07-21T20:43:50Z (GMT). No. of bitstreams: 1 Luiz Cezar Lima Junior.pdf: 4959123 bytes, checksum: 8ba169401ed3c8565f7d14d0d74e19c1 (MD5) Previous issue date: 2016-08-29<br>Geopolymers, or ‘inorganic polymers’, considered an alternative cementing system to the convention Portland cement, are formed due to the dissolution, under a high alkali solution, of natural raw materials containing aluminosilicate species. The product of this reaction is the obtainment of a synthetic aluminosilicate product, manufactured under low temperature or even at room temperature.
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Barra, Bruna Neri. "Funcionalização de fibras vegetais com plasma frio de metano para desenvolvimento de novos produtos em fibrocimento." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/74/74133/tde-30012015-150312/.

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Dentre as fibras vegetais estudadas como reforço para produção de compósitos cimentícios, as fibras de coco verde e sisal se destacam por suas características mecânicas de interesse industrial, baixo custo e baixa densidade. O objetivo deste trabalho é o estudo da funcionalização de fibras de coco verde e sisal, pela técnica de polimerização com plasma frio de metano, bem como a análise do efeito do tratamento, a fim de reduzir a hidrofilicidade natural das fibras, preservar suas propriedades mecânicas e aumentar sua durabilidade em meio alcalino. Fibras de coco verde e sisal foram tratadas co
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46

Cachepa, Moisés Mário. "Mitigação da reação álcali-agregado em concreto com o emprego de resíduo de cerâmica vermelha e metacaulim." Universidade do Vale do Rio dos Sinos, 2017. http://www.repositorio.jesuita.org.br/handle/UNISINOS/6360.

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Submitted by JOSIANE SANTOS DE OLIVEIRA (josianeso) on 2017-06-20T12:30:42Z No. of bitstreams: 1 Moisés Mário Cachepa_.pdf: 3004067 bytes, checksum: 24c7ce290fa414a34e3454c918c0403c (MD5)<br>Made available in DSpace on 2017-06-20T12:30:42Z (GMT). No. of bitstreams: 1 Moisés Mário Cachepa_.pdf: 3004067 bytes, checksum: 24c7ce290fa414a34e3454c918c0403c (MD5) Previous issue date: 2017-05-22<br>CNPQ – Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>O uso de adições minerais, como as pozolanas, tem sido adotado como adição ou substituição parcial do cimento, fundamentalmente
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Bílek, Vlastimil. "Alkalicky aktivované systémy." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-319676.

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This doctoral thesis is focused on the possibilities of alkali-activated slag (AAS) shrinkage reduction, which would together with the use of waste sludge from waterglass production contribute to wider practical utilization of this interesting material. Besides the influence on AAS dimensional changes also effect of various factors on workability, setting time and mechanical properties was investigated. Obtained results were supported by the application of instrumental techniques like izotermal calorimetry, mercury intrusion porosimetry, scanning electron microscopy and X-ray diffraction. The
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48

Chen, Jio-Hao, and 陳家豪. "Mix Proportioning of Alkali-Activated Slag Cement." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/46733822336650931383.

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碩士<br>國立雲林科技大學<br>營建工程系碩士班<br>93<br>Pure alkali activated slag, no cement, was used in making the grout and mortar in the test of this study. Through delicate calculation according to the weight ratios of alkali/slag, SiO2/Na2O, and water/slag, the weights of the ingredients, slag, water, SiO2, Na2O and standard sand, of pure alkali activated slag grout or mortar were determined. The mechanic properties of the grout were characterized including consistency, initial setting time, and final setting time. The flow, and compressive strength for 3, 7, and 28 days of the mortar were also tested. Rat
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Matos, Fábio André Cancelas. "Improvement of a lime-based mortar's thermal properties using alkaline activation." Master's thesis, 2018. http://hdl.handle.net/10773/25827.

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This dissertation was developed as proposed by company Domínio Do Ligante – Argamassas Tradicionais Pré-doseadas Lda. In cooperation with the Department of Geoscience of University of Aveiro, granting the author the conclusion of the second cycle of studies in Geomaterials and Geological Resources by the aforementioned institution. The main goal of this study is to improve the thermal insulation properties, mainly thermal conductivity, of lime-based mortar ‘DDL.ECM Projeção’ through alkali activation instead of traditional hydration. As a secondary objective, the study intends to evaluate the
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Chang, Po-Yao, and 張博堯. "Effect The Rheological Properties Of Cement/Superplasticizer Related To The Alkali Content In The Cement." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/63747886964508879397.

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碩士<br>國立高雄應用科技大學<br>土木工程與防災科技研究所<br>91<br>What’s the degree that alkali content can make influence to the rheological behavior of cement paste which include superplasticizer can’t understand completely still. So the research want to use the different type of cement (I、II、V type) to mimic the different C3A and alkali content, add in the different superplasticizer use mini slump spread areas, Marsh cone flow time, Brookfield viscosity, setting time, bleeding content and SEM microcosmic analysis, to explore the influence that alkali content can make to the rheological behavior of cement paste whi
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