Relevant bibliographies by topics / Tricalcium silicates

Academic literature on the topic 'Tricalcium silicates'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Tricalcium silicates"

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Primathena, Indra, Denny Nurdin, Rahmi Alma Farah Adang, and Arief Cahyanto. "Composition and Functional Groups Evaluation of Indonesian Grey Portland Cement as Material for Dental Application." Key Engineering Materials 782 (October 2018): 256–61. http://dx.doi.org/10.4028/www.scientific.net/kem.782.256.

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Tricalcium silicates cement known as Mineral Trioxide Aggregate (MTA) was one of the influential materials in endodontics. At recent, MTA in dental application play an essential role in endodontics treatment due to its potential to regenerate tertiary dentine, apexification, and seal perforated root. However, MTA for dental application is still expensive. Portland cement has similarities with the MTA, especially portland cement fabricated in Indonesia. The purpose of this study is to investigate the composition and functional groups of tricalcium silicate from portland cement that fabricated in Indonesia. The Indonesian grey portland cement powder/portland cement type I (SNI-15-7064-2014) was used as a sample and commercialized MTA from Tehnodent (Rootdent) was used as a control for comparison. Powder and control samples were evaluated using X-ray fluorescence spectrometry (XRF) for composition test and Fourier-transform infrared spectroscopy (FTIR) for functional group analyses. The XRF evaluation showed that the composition and concentration of Indonesian grey portland cement powder almost has similarity with commercial MTA. Moreover, the Indonesian grey portland cement powder has higher Calcium and Silicon ions compared to MTA. The FTIR analyses revealed that the calcium silicate groups were detected. In conclusion, the Indonesian grey portland cement powder has high similarity to MTA, therefore, it has a possibility to be used as tricalcium silicate cement for MTA substitution. Further study is awaited based on this initial finding found in this study.
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Zhao, Yan Ting, Xi Chen, Ling Chao Lu, Yong Bo Huang, and Jie Zhang. "Determination of Tricalcium Silicates Crystal Forms in Belite-Barium Calcium Sulphoaluminate Cement." Applied Mechanics and Materials 541-542 (March 2014): 204–8. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.204.

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Chemical method of extraction was adopted in the study, and aqueous solution of potassium hydroxide and sucrose (KOSH) was used to obtain the clinker rich in silicate phases (alite and belite) in order to get the crystal forms of tricalcium silicates (C3S) in the belite-barium calcium sulphoaluminate cement clinker. The crystal forms of C3S were finally determined by XRD (X-ray diffraction) spectrums through its characteristic windows of the diffraction spectrums. Results shows that, C3S exists in the innovative cement system mainly in the form of M1; C2.75B1.25A3can completely dissolve in KOSH solution while its dissolution is inhibited in the cement system; after KOSH treatment, diffraction peaks of C4AF disappear totally and peaks of C3A has weakened to great extent; for the cement clinker, the clinker ground for 90min has the best extraction rate.
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About, Imad. "Recent Trends in Tricalcium Silicates for Vital Pulp Therapy." Current Oral Health Reports 5, no. 3 (July 9, 2018): 178–85. http://dx.doi.org/10.1007/s40496-018-0186-y.

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Ashrit, Shrenivas, Ravikrishna V. Chatti, S. Sarkar, Rayasam Venugopal, and Udayabhanu G. Nair. "An infrared spectroscopic study of non-metallic portion of Linz-Donawitz slag fines generated at Tata Steel, Jamshedpur." Metallurgical Research & Technology 115, no. 6 (2018): 608. http://dx.doi.org/10.1051/metal/2018024.

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The main constituents of LD Slag fines in the size range of 0–6 mm after recovering the metallic iron in a waste recycling plant (WRP) mainly contains calcium bearing mineral phases such as mono, di and tricalcium silicates along with free lime. The chemical constituents are CaO, SiO2, FeO and Al2O3 with traces of chromium, manganese, etc., as oxides. The WRP waste, i.e., LD Slag fines of 0–6 mm is further subjected to sieving mainly into three different size fractions viz. + 10 mesh (−6.0 + 2.0 mm), + 60 mesh (−2.0 + 0.25 mm), −60 mesh (−0.25 mm) for studying its possible application economically in different sectors such as agriculture, construction and chemical industries. Chemical and XRD analysis indicate high lime content along with some compounds like calcite, silicates of calcium, brownmillerite and dicalcium diferrate, etc., in these slag samples. FTIR analysis of these size fractions also indicates the presence of hydrated silicates, calcite and anhydrous calcium silicate. In this study, the authors have attempted to correlate the chemical analysis and XRD studies with FTIR technique of characterisation for better understanding of the parent material. This was done to get a deeper insight of the fines which can be useful for development of suitable calcium-based value added materials for different industrial, chemical and agricultural applications.
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Shahsavari, Rouzbeh, Lei Tao, and Lu Chen. "Structure, Energetics, and Impact of Screw Dislocations in Tricalcium Silicates." Journal of the American Ceramic Society 99, no. 7 (April 8, 2016): 2512–20. http://dx.doi.org/10.1111/jace.14255.

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Qi, Chongchong, Qiusong Chen, and Andy Fourie. "Role of Mg Impurity in the Water Adsorption over Low-Index Surfaces of Calcium Silicates: A DFT-D Study." Minerals 10, no. 8 (July 26, 2020): 665. http://dx.doi.org/10.3390/min10080665.

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Calcium silicates are the most predominant phases in ordinary Portland cement, inside which magnesium is one of the momentous impurities. In this work, using the first-principles density functional theory (DFT), the impurity formation energy (Efor) of Mg substituting Ca was calculated. The adsorption energy (Ead) and configuration of the single water molecule over Mg-doped β-dicalcium silicate (β-C2S) and M3-tricalcium silicate (M3-C3S) surfaces were investigated. The obtained Mg-doped results were compared with the pristine results to reveal the impact of Mg doping. The results show that the Efor was positive for all but one of the calcium silicates surfaces (ranged from −0.02 eV to 1.58 eV), indicating the Mg substituting for Ca was not energetically favorable. The Ead of a water molecule on Mg-doped β-C2S surfaces ranged from –0.598 eV to −1.249 eV with the molecular adsorption being the energetically favorable form. In contrast, the Ead on M3-C3S surfaces ranged from −0.699 eV to −4.008 eV and the more energetically favorable adsorption on M3-C3S surfaces was dissociative adsorption. The influence of Mg doping was important since it affected the reactivity of surface Ca/Mg sites, the Ead of the single water adsorption, as well as the adsorption configuration compared with the water adsorption on pristine surfaces.
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Zamparini, Fausto, Carlo Prati, Paola Taddei, Andrea Spinelli, Michele Di Foggia, and Maria Giovanna Gandolfi. "Chemical-Physical Properties and Bioactivity of New Premixed Calcium Silicate-Bioceramic Root Canal Sealers." International Journal of Molecular Sciences 23, no. 22 (November 11, 2022): 13914. http://dx.doi.org/10.3390/ijms232213914.

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The aim of the study was to analyze the chemical–physical properties and bioactivity (apatite-forming ability) of three recently introduced premixed bioceramic root canal sealers containing varied amounts of different calcium silicates (CaSi): a dicalcium and tricalcium silicate (1–10% and 20–30%)-containing sealer with zirconium dioxide and tricalcium aluminate (CERASEAL); a tricalcium silicate (5–15%)-containing sealer with zirconium dioxide, dimethyl sulfoxide and lithium carbonate (AH PLUS BIOCERAMIC) and a dicalcium and tricalcium silicate (10% and 25%)-containing sealer with calcium aluminate, tricalcium aluminate and tantalite (NEOSEALER FLO). An epoxy resin-based sealer (AH PLUS) was used as control. The initial and final setting times, radiopacity, flowability, film thickness, open pore volume, water absorption, solubility, calcium release and alkalizing activity were tested. The nucleation of calcium phosphates and/or apatite after 28 days aging in Hanks balanced salt solution (HBSS) was evaluated by ESEM-EDX, vibrational IR and micro-Raman spectroscopy. The analyses showed for NeoSealer Flo and AH Plus the longest final setting times (1344 ± 60 and 1300 ± 60 min, respectively), while shorter times for AH Plus Bioceramic and Ceraseal (660 ± 60 and 720 ± 60 min, respectively). Radiopacity, flowability and film thickness complied with ISO 6876/12 for all tested materials. A significantly higher open pore volume was observed for NeoSealer Flo, AH Plus Bioceramic and Ceraseal when compared to AH Plus (p < 0.05), significantly higher values were observed for NeoSealer Flo and AH Plus Bioceramic (p < 0.05). Ceraseal and AH Plus revealed the lowest solubility. All CaSi-containing sealers released calcium and alkalized the soaking water. After 28 days immersion in HBSS, ESEM-EDX analyses revealed the formation of a mineral layer that covered the surface of all bioceramic sealers, with a lower detection of radiopacifiers (Zirconium for Ceraseal and AH Plus Bioceramic, Tantalum for NeoSealer Flo) and an increase in calcium, phosphorous and carbon. The calcium phosphate (CaP) layer was more evident on NeoSealer Flo and AH Plus Bioceramic. IR and micro-Raman revealed the formation of calcium carbonate on the surface of all set materials. A thin layer of a CaP phase was detected only on AH Plus Bioceramic and NeoSealer Flo. Ceraseal did not show CaP deposit despite its highest calcium release among all the tested CaSi-containing sealers. In conclusion, CaSi-containing sealers met the required chemical and physical standards and released biologically relevant ions. Slight/limited apatite nucleation was observed in relation to the high carbonation processes.
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Zea-Garcia, Jesus D., Angeles G. De la Torre, Miguel A. G. Aranda, and Ana Cuesta. "A Comparative Study of Experimental Configurations in Synchrotron Pair Distribution Function." Materials 12, no. 8 (April 25, 2019): 1347. http://dx.doi.org/10.3390/ma12081347.

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The identification and quantification of amorphous components and nanocrystalline phases with very small crystal sizes, smaller than ~3 nm, within samples containing crystalline phases is very challenging. However, this is important as there are several types of systems that contain these matrices: building materials, glass-ceramics, some alloys, etc. The total scattering synchrotron pair distribution function (PDF) can be used to characterize the local atomic order of the nanocrystalline components and to carry out quantitative analyses in complex mixtures. Although the resolution in momentum transfer space has been widely discussed, the resolution in the interatomic distance space has not been discussed to the best of our knowledge. Here, we report synchrotron PDF data collected at three beamlines in different experimental configurations and X-ray detectors. We not only discuss the effect of the resolution in Q-space, Qmax ins of the recorded data and Qmax of the processed data, but we also discuss the resolution in the interatomic distance (real) space. A thorough study of single-phase crystalline nickel used as standard was carried out. Then, selected cement-related samples including anhydrous tricalcium and dicalcium silicates, and pastes derived from the hydration of tricalcium silicate and ye’elimite with bassanite were analyzed.
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Paula, Anabela, Eunice Carrilho, Mafalda Laranjo, Ana M. Abrantes, João Casalta-Lopes, Maria Filomena Botelho, Carlos Miguel Marto, and Manuel M. Ferreira. "Direct Pulp Capping: Which is the Most Effective Biomaterial? A Retrospective Clinical Study." Materials 12, no. 20 (October 16, 2019): 3382. http://dx.doi.org/10.3390/ma12203382.

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(1) Background: Recently, tricalcium silicate cements, such as Biodentine™, have emerged. This biomaterial has a calcium hydroxide base and characteristics like mineral aggregate trioxide cements, but has tightening times that are substantially more suitable for their application and other clinical advantages. (2) Methods: A retrospective clinical study was conducted with 20 patients, which included a clinical evaluation of the presence or absence of pulp inflammation compatible symptoms, radiographic evaluation of the periapical tissues, and structural alterations of the coronary restoration that supports pulp capping therapies with Biodentine™ and WhiteProRoot®MTA. (3) Results: This clinical study revealed similar success rates between mineral trioxide cement and tricalcium silicates cements at 6 months, with 100% and 95% success rates, respectively. There were no statistically significant differences between both biomaterials and between these and the various clinical circumstances, namely the absolute isolation of the operating field, exposure size, the aetiology of exposure, and even the type of restorative material used. (4) Conclusions: Biodentine™ demonstrated a therapeutic effect on the formation of a dentin bridge accompanied by slight inflammatory signs, with a high clinical success rate, indicating the possibility of its effective and safe use in dental pulp direct capping in humans, similar to the gold standard material.
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Lin, Qing, Yanbao Li, Xianghui Lan, Chunhua Lu, Yixin Chen, and Zhongzi Xu. "The apatite formation ability of CaF 2 doping tricalcium silicates in simulated body fluid." Biomedical Materials 4, no. 4 (June 30, 2009): 045005. http://dx.doi.org/10.1088/1748-6041/4/4/045005.

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Dissertations / Theses on the topic "Tricalcium silicates"

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Begarin, Farid. "Etude de paramètres endogènes et exogènes au ciment Portland ordinaire influençant l'hydratation de sa phase principale : le silicate tricalcique." Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00845948.

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Ce travail consacré à l'étude des différents paramètres influençant l'hydratation de la phase silicate principale du Ciment Portland Ordinaire (OPC) a été réalisé au Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB). Cette étude s'inscrit dans le cadre du projet " Crystal Growth Control " initié par BASF dans le but de contrôler et de prévoir le mieux possible l'hydratation du Ciment Portland Ordinaire. La dissolution de l'alite, comme celle du C3S pur, est rapide dans l'eau pure. La vitesse diminue avec l'écart à l'équilibre et la concentration en ions aluminates en solution. On observe également une adsorption sur la surface de l'alite de l'aluminium libéré par la dissolution. La germination et la croissance des C-S-H a été étudié d'une part, en présence d'aluminates en solution et d'autre part en présence de sels inorganiques connus pour être des accélérateurs de l'hydratation du ciment Portland Ordinaire. La présence d'aluminium ne modifie pas la germination initiale des C-S-H mais semble participer directement à l'origine de la période dormante du ciment. L'hydratation du C3S dans des solutions salines conduit à former pendant la germination initiale d'autant plus de C-S-H que la solution est concentrée. De plus la morphologie des germes est modifiée. Chaque germe doit contenir plus de matière en occupant moins de surface. La simulation de l'ensemble de la courbe d'avancement de l'hydratation observée dans les solutions de sels de nitrates et d'halogénures de calcium, sodium et potassium à l'aide du modèle de croissance par agrégation de particules cubiques confirme l'anisotropie au cours de la croissance des germes. La vitesse de croissance des C-S-H perpendiculairement à la surface des grains augmente avec la concentration et l'effet est très dépendant de la nature de l'anion. Ce comportement est à rapprocher des séries d'Hofmeister
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Queiroz, Marcela Borsatto. "Physicochemical and biological properties of tricalcium silicate-based reparative materials with alternative radiopacifiers and Biosilicate /." Araraquara, 2018. http://hdl.handle.net/11449/153908.

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Orientador: Mário Tanomaru Filho
Abstract: Tricalcium silicate cements associated with radiopacifiers are used as repair materials. Publication 1: Evaluation of tricalcium silicate-based cements (TCS) associated with zirconium oxide (ZrO2), calcium tungstate (CaWO4) or niobium oxide (Nb2O5) radiopacifiers compared to MTA Repair HP (MTA HP). Publication 2: Evaluation of tricalcium silicate-based cements (TCS) associated with zirconium oxide (ZrO2) radiopacifier with 10% or 20% of Biosilicate (TCS ZrO2 + 10% Biosilicate and TCS ZrO2 + 20% Biosilicate) compared to Biodentine. Setting Time (ST) and radiopacity were evaluated based on ISO 6876/2002 standard. Solubility was evaluated according to the method proposed by Carvalho-Júnior et al. (2007) modified. pH was measured at 3, 12 and 24 hours and 7, 14 and 21 days after immersion in distilled water. Cellular cytotoxicity and bioactivity were evaluated by methyltetrazolium (MTT), neutral red (NR), alkaline phosphatase (ALP), alizarin red (ARS) and real time PCR (qPCR) (Publication 1) assays in different periods of contact with eluates of the materials in Saos-2 cells. Antibacterial activity was evaluated by direct contact on Enterococcus faecalis in the planktonic form. For the physico-chemical and ARS tests, the data were submitted to ANOVA and Tukey tests; for MTT, NR and ALP tests the data were analyzed by the Two-Way ANOVA and Bonferroni tests; the antibacterial activity, were submitted to Kruskall-Wallis and Dunn tests (α = 0.05). Publication 1: TCS + CaWO4 presented... (Complete abstract click electronic access below)
Resumo: Cimentos de silicato tricálcico com radiopacificadores são utilizados como materiais reparadores. Publicação 1: Avaliação de cimento à base de silicato tricálcico (STC) associado aos radiopacificadores óxido de zircônio (ZrO2), tungstato de cálcio (CaWO4) ou óxido de nióbio (Nb2O5) em comparação ao MTA Repair HP (MTA HP). Publicação 2: Avaliação de material à base de silicato tricálcico (STC) e radiopacificador óxido de zircônio (ZrO2) e 10% ou 20% de Biosilicato (STC ZrO2 + 10% de Biosilicato e STC ZrO2 + 20% de Biosilicato) em comparação ao Biodentine. Tempo de presa e a radiopacidade foram avaliados seguindo ISO 6876/2002. A solubilidade foi avaliada de acordo com o método proposto por Carvalho-Júnior et al. (2007) modificado. pH foi avaliado 3, 12 e 24 horas, 7, 14 e 21 dias após imersão em água destilada. A citotoxidade e bioatividade celular foram avaliadas pelos testes metiltetrazólio (MTT), vermelho neutro (VN), atividade de fosfatase alcalina (ALP), ensaio de vermelho de alizarina (ARS) e PCR em tempo real (qPCR) (Publicação1), em diferentes períodos de contato com eluídos dos materiais em células Saos-2. Atividade antimicrobiana dos materiais foi avaliada por meio do teste de contato direto com Enterococcus faecalis na forma planctônica. Para os testes físicoquímicos e ARS, os dados foram submetidos aos testes ANOVA e Tukey; para os ensaios do MTT, VN e ALP e qPCR os dados foram analisados aos testes Two Way ANOVA e Bonferroni; os dados da atividade antimicrobiana f... (Resumo completo, clicar acesso eletrônico abaixo)
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Claverie, Jérôme. "Molecular dynamics investigation of the mechanical, thermal and surface properties of tricalcium silicate and its early hydration /." Ilha Solteira, 2019. http://hdl.handle.net/11449/191301.

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Orientador: João Manuel Marques Cordeiro
Abstract: The energetical and environmental problematic related to the cement production is a very sensitive issue. As every other field, the construction industry must go through drastic change in the design of concrete and cement-based materials. The understanding of the physical and chemical properties of the Portland cement (PC) clinker is important to improve its design. Tricalcium silicate C3S, or alite, is the main phase of PC clinker and has been largely studied since it is the first responsible for the strength development of the cement paste. On the other hand, the development of computational methods at the molecular scale has made possible the modelling of structural, dynamical and energetic properties, sometimes hardly measurable by experimental means. Such methods are relatively new in the field of cement chemistry, but have been increasingly employed over the last 15 years. In this project, density functional theory (DFT), classical molecular dynamics (MD), and ab initio molecular dynamics (AIMD) are employed towards a better understanding of mechanical, thermal, and superficial properties of monoclinic C3S, as well as C3S/water interface features. The present thesis consists of five chapters. The first chapter presents a review of the literature on the chemistry of cement, and more particularly on the hydration process modeling. The various phases which compose the Portland cement clinker are introduced, then the the different polymorphs of C3S are described, in particu... (Complete abstract click electronic access below)
Resumo: A produção de cimento envolve questões energéticas e ambientais muito relevantes. Em função disso, a indústria da construção deve sofrer mudanças radicais na concepção de concreto de materiais cimentícios. A compreensão das propriedades físicas e químicas do clínquer de cimento Portland (PC) é importante para melhorar seu design. O silicato tricálcico (C3S), ou alita, é a fase principal do clínquer de PC e tem sido amplamente estudado uma vez que é o principal responsável pelo desenvolvimento da resistência da pasta de cimento. Por outro lado, o desenvolvimento de métodos de cálculo na escala molecular possibilitou a modelagem de propriedades estruturais, dinâmicas e energéticas, às vezes difícil de medir por meios experimentais. Esses métodos são relativamente novos no campo da química do cimento, mas tem sido cada vez mais empregados nos últimos 15 anos anos. Neste trabalho, a teoria de funcional da densidade (DFT), a dinâmica molecular clássica (MD) e a dinâmica molecular ab initio (AIMD) são utilizadas para permitir uma melhor compreensão das características mecânicas, térmicas e de superfície do C3S monoclinico, bem como propriedades da interface C3S/água. Esta tese consiste em cinco capítulos: O primeiro capítulo apresenta uma revisão da literatura sobre a química dos cimento e, mais particularmente, sobre o processo de hidratação e sua modelagem. Introduzimos as diferentes fases que compõem o clínquer de cimento Portland, em seguida, a estrutura e os diferentes polimor... (Resumo completo, clicar acesso eletrônico abaixo)
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Peterson, Vanessa Kate. "Diffraction investigations of cement clinker and tricalcium silicate using Rietveld analysis /." Electronic version, 2003. http://adt.lib.uts.edu.au/public/adt-NTSM20040830.173127/index.html.

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Thesis (Ph. D.)--University of Technology, Sydney, 2003.
"Submited for the degree of Doctor of Philosophy, University of Technology, Sydney, Dept. of Chemistry, Materials and Forensic Sciences, August 2003" Bibliographic references: leaves 224-232.
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Whitfield, Troy T. "Effect of Tricalcium Silicate Content on Expansion in Internal Sulfate Attack." Scholar Commons, 2006. http://scholarcommons.usf.edu/etd/3802.

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The purpose of this study was to determine the cementitious parameters and placement temperature that impact internal sulfate attack in concrete. Concrete structures make up a large percentage of the infrastructure and multifamily housing. Durability is very important. Cements can be formulated to reduce the impact of external environmental exposure such as high salinity from marine environments or high sulfate levels from soils or surface waters. Concrete is also subject to internal attack such as alkali aggregate reaction, (AAR), and delayed ettringite formation, (DEF). This study focused on some of the cement chemistry issues that determine susceptibility of cement to DEF. Expansion due to DEF can weaken the concrete matrix resulting in microcracks that in some cases may progress to severe matrix cracking. The end result is loss of load carrying capacity and costly repairs. In this study, mortar bars were made with the as received cement chemistry and using additions of sulfate, and alkalis. The bars were then heat cured at various temperatures and stored in a saturated lime solution at room temperature. Measurements were made at predetermined time intervals. The series of mixes were made to determine the effect of varying sulfate levels, heat curing temperature, and alkali content in order to isolate the effect of these constituents. The cements were selected on the basis of tricalcium aluminate, alkali content, sulfate levels, C3S levels and fineness. The results indicate that a relationship exists between the rate and level of expansion experienced by the mortar bars and cementitious parameters, namely, alkali content, sulfate content, C3S levels and heat curing temperature.
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Rastoul, Juillan Katy. "Interaction polymère associatif - ciment en milieu pâteux Adsorption - Stabilité - Rhéologie." Paris 6, 2003. http://www.theses.fr/2003PA066479.

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Mishra, Ratan K. "Simulation of Interfaces in Construction Materials: Tricalcium Silicate, Gypsum, and Organic Modifiers." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1333037184.

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Damidot, Denis. "Etude de l'hydratation du silicate tricalcique en suspensions diluées par microcalorimétrie isotherme." Dijon, 1990. http://www.theses.fr/1990DIJOS036.

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Le silicate tricalcique est le constituant principal du ciment Portland utilisé dans le béton. L’hydratation du silicate tricalcique conduit à former deux hydrates peu solubles, l'hydrosilicate de calcium et la portlandite. La cinétique de l'hydratation du silicate tricalcique a été étudiée sur des suspensions diluées et agitées par microcalorimétrie et conductimétrie. L’utilisation simultanée de ces techniques a conduit à des résultats originaux qui ont permis de mettre en évidence: 1) le début de la précipitation de l'hydrosilicate de calcium et de la portlandite; 2) l'existence de deux étapes cinétiques lors de la précipitation de l'hydrosilicate de calcium. La première est observée lorsque la solution est sous-saturée par rapport à la portlandite et la seconde lorsque la solution est sursaturée par rapport à la portlandite. Au début de chacune des étapes, la cinétique est gouvernée par la nucléation-croissance de l'hydrosilicate de calcium puis par la diffusion à travers la couche formée par ce dernier autour des grains de silicate tricalcique. Le changement de régime cinétique correspond à un taux d'avancement de la réaction différent lors des deux étapes. Ceci indique que l'hydrosilicate de calcium formé lors de la première étape est différent de celui formé lors de la seconde, bien qu'aucune différence structurale n'ait pu être établie par RMN du silicium 29 ou par diffraction des rayons X. La compréhension du processus de l'hydratation du silicate tricalcique en suspension a permis d'expliquer l'hydratation du silicate tricalcique en pâte grâce à la continuité qui a été établie entre ces deux milieux. Ainsi les hypothèses antérieures pour expliquer l'hydratation du silicate tricalcique en pâte ont pu être discutées de façon critique à la lumière de nos résultats.
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Maggion, Renaud. "Etude de l'evolution de la microtexture de pates de silicate tricalcique hydrate." Orléans, 1992. http://www.theses.fr/1992ORLE2026.

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Le silicate tricalcique, (ca#3sio#5 ou c#3s) est le constituant majeur du clinker de ciment portland. L'hydratation de cette phase conduit a la formation de portlandite et d'un gel peu cristallin, le csh qui est le principal responsable du developpement des resistances de la pate de ciment. Le developpement en continu de l'aire interfaciale accessible a l'eau a ete suivi, par rmn du deuteron, entre 0 et 160 heures apres le gachage sur des pates hydratees preparees a des rapports ponderaux d#2o/c#3s de 0,4; 0,6 et 0,8. Les resultats obtenus indiquent que la surface specifique limite (proche de 100 m#2/g) est atteinte au bout d'une soixantaine d'heures de temps d'hydratation. L'augmentation de la surface est parfaitement correlee a la precipitation acceleree des hydrates telle que l'on peut la suivre par calorimetrie. La porosite, la repartition dimensionnelle des pores, l'aire interfaciale, et la microtexture a des echelles comprises entre 2 nm et 2 m ont ete etudiees sur un lot de pates hydratees a h#2o/c#3s de 0,4 et conservees dans le lait de chaux. Le temps d'hydratation varie de 1 a 500 jours. Il apparait que l'essentiel de la structuration de la pate est realisee dans les trente a cinquante premiers jours de l'hydratation. La porosite (mesuree par intrusion de mercure et par analyse d'images), la surface specifique developpee par les hydrates et la densite sont des fonctions lineaires du taux d'hydratation. L'evolution de la texture a l'echelle micronique intervient egalement au cours de cette periode. Cependant, a plus longue echeance, la diffusion des rayons x aux petites angles indique des modifications de la microtexture a l'echelle de quelques nanometres. Cette evolution qui a lieu a taux d'hydratation constant (et egal a 1) est liee a un processus de rearrangement de l'interface qui intervient a surface accessible a l'eau constante
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Mansoutre, Sandrine. "Des suspensions concentrees aux milieux granulaires lubrifies : etude de pates de silicate tricalcique." Orléans, 2000. http://www.theses.fr/2000ORLE2014.

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Les correlations croisees entre les parametres rheologiques en cisaillement, la dilatance et les mesures de retention d'eau, ont permis d'etablir un diagramme de phase rheologique d'une pate fraiche de c 3s en fonction de la concentration depuis le regime de suspension concentree, ou le comportement est essentiellement dicte par les interactions hydrodynamiques et ou la viscosite suit la loi de krieger-dougherty, jusqu'au regime de pate granulaire, ou le comportement est domine par les contacts solides et dans lequel le materiau presente un caractere dilatant. Par extension, le seuil de cisaillement de pates cimentaires a pu etre decrit par la combinaison d'une contribution physico-chimique, qui depend du point de demande en eau de la poudre et de la force ionique de la solution interstitielle, et d'une contribution granulaire qui traduit les frottements entre les grains. L'information apportee par les mesures directes de force par afm, a permis de proposer un schema d'action d'agents modificateurs de seuil : (1) les electrolytes en solution augmentent le seuil de la pate en renforcant la cohesion entre les flocs si ces ions sont dits forts vis-a-vis de la solubilite (par exemple les nitrates) et en provoquant une transition type liquide/solide si ceux-ci sont dits intermediaires (par exemple les sulfates) ; (2) les polyelectrolytes de type poly(naphtalene sulfonate) reduisent le seuil par ecrantage des interactions entre grains dans le regime de suspension concentree et par lubrification des contacts dans le regime granulaire. La lubrification n'est effective qu'aux faibles vitesses de deformation.
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Book chapters on the topic "Tricalcium silicates"

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Gooch, Jan W. "Tricalcium Silicate." In Encyclopedic Dictionary of Polymers, 763. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12087.

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Joseph, Shiju, Ahmed Khalifa, and Özlem Cizer. "Hydration of Tricalcium Silicate Blended with Calcined Clay." In RILEM Bookseries, 411–15. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2806-4_49.

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Sun, Yanjie, and Chi Sun Poon. "Effect of Seawater on the Hydration of Tricalcium Silicate." In Concrete Durability and Service Life Planning, 37–41. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43332-1_8.

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Cardenas, L. J., A. Takeuchi, K. Tsuru, S. Matsuya, and K. Ishikawa. "Synthesis and in Vitro Cell Compatibility of α-Tricalcium Phosphate-Based Apatite Cement Containing Tricalcium Silicate." In IFMBE Proceedings, 207–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12020-6_52.

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Singh, L. P., S. K. Bhattacharyya, S. P. Shah, and U. Sharma. "Studies on Hydration of Tricalcium Silicate Incorporating Silica Nano-particles." In Nanotechnology in Construction, 151–59. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17088-6_18.

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Massie, Iain, J. M. S. Skakle, and I. R. Gibson. "Synthesis and Phase Stability of Silicate-Substituted α-Tricalcium Phosphate." In Bioceramics 20, 67–70. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-457-x.67.

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Chloup-Bondant, Myriam, and Omer Evrard. "Tricalcium Aluminate and Silicate Hydration. Effect of Limestone and Calcium Sulfate." In Nuclear Magnetic Resonance Spectroscopy of Cement-Based Materials, 295–308. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80432-8_23.

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Grimmer, Arnd-Rüdiger, and Hélène Zanni. "29Si NMR Study of Chemical Shift Tensor Anisotropy of Tricalcium Silicate." In Nuclear Magnetic Resonance Spectroscopy of Cement-Based Materials, 57–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80432-8_3.

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Bresson, B., S. Masse, H. Zanni, and C. Noik. "Tricalcium Silicate Hydration at High Temperature. A 29Si and 1H NMR Investigation." In Nuclear Magnetic Resonance Spectroscopy of Cement-Based Materials, 209–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80432-8_15.

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Comotti, Angiolina, Roberto Simonutti, and Piero Sozzani. "Hydration of Tricalcium Silicate by D2O: 29Si and 2H Solid State NMR Spectra." In Nuclear Magnetic Resonance Spectroscopy of Cement-Based Materials, 237–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-80432-8_18.

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Conference papers on the topic "Tricalcium silicates"

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Livingston, Richard A., Daniel A. Neumann, Stephen FitzGerald, and Jack J. Rush. "Quasi-elastic neutron scattering study of the hydration of tricalcium silicate." In Fifth International Conference on Applications of Nuclear Techniques: Neutrons in Research and Industry, edited by George Vourvopoulos. SPIE, 1997. http://dx.doi.org/10.1117/12.267887.

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Saseendran, Vishnu, Namiko Yamamoto, Peter Collins, Aleksandra Radlinska, Evan J. Pineda, and Brett A. Bednarcyk. "Micromechanics-based Modeling of Mechanical Properties of Tricalcium Silicate Processed under Microgravity." In AIAA SCITECH 2023 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2023. http://dx.doi.org/10.2514/6.2023-2025.

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Collins, Peter J., Richard N. Grugel, and Aleksandra Radlińska. "The Influence of Variable Gravity on the Microstructural Development of Tricalcium Silicate Pastes." In 17th Biennial International Conference on Engineering, Science, Construction, and Operations in Challenging Environments. Reston, VA: American Society of Civil Engineers, 2021. http://dx.doi.org/10.1061/9780784483381.006.

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"Chemical Interaction of Di-Phosphonate Terminated Monofunctional Polyoxyethylene Superplasticizer with Hydrating Tricalcium Silicate." In SP-195: The Sixth Canmet/ACI Conference on Superplasticizers and Other Chemical Admixtures in Concrete. American Concrete Institute, 2000. http://dx.doi.org/10.14359/9905.

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Xu, Zhenhai, Zonghui Zhou, and Xin Cheng. "Effect of Nano-SiO2 Content on the Setting Time and Mechanical Properties of Tricalcium Silicate." In International Conference on the Durability of Concrete Structures. Purdue University Press, 2016. http://dx.doi.org/10.5703/1288284316133.

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"Hindered Calcium Hydroxide Nucleation and Growth as Mechanism Responsible for Tricalcium Silicate Retardation in Presence of Sucrose." In "SP-329: Superplasticizers and Other Chemical Admixtures in Concrete Proceedings Twelfth International Conference, Beijing, China". American Concrete Institute, 2018. http://dx.doi.org/10.14359/51711210.

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