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Academic literature on the topic 'Calcium Aluminate Cement'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 May 2024

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Journal articles on the topic "Calcium Aluminate Cement"

1

Madej, Dominika. "Strontium Retention of Calcium Zirconium Aluminate Cement Paste Studied by NMR, XRD and SEM-EDS." Materials 13, no. 10 (May 21, 2020): 2366. http://dx.doi.org/10.3390/ma13102366.

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This work concerns the hydration mechanism of calcium zirconium aluminate as a ternary compound appearing in the CaO-Al2O3-ZrO2 diagram besides the calcium aluminates commonly used as the main constitutes of calcium aluminate cements (CACs). Moreover, a state-of-the-art approach towards significant changes in hydraulic properties was implemented for the first time in this work, where the effect of structural modification on the hydration behavior of calcium zirconium aluminate was proved by XRD, 27Al MAS NMR and SEM-EDS. The substitution of Sr2+ for Ca2+ in the Ca7ZrAl6O18 lattice decreases the reactivity of Sr-substituted Ca7ZrAl6O18 in the presence of water. Since the original cement grains remain unhydrated up to 3 h (Ca7ZrAl6O18) or 72 h (Sr1.25Ca5.75ZrAl6O18) of curing period in the hardened cement paste structures, strontium can be considered as an inhibition agent for cement hydration. The complete conversion from anhydrous 27AlIV to hydrated 27AlVI species was achieved during the first 24 h (Ca7ZrAl6O18) or 7 d(Sr1.25Ca5.75ZrAl6O18) of hydration. Simultaneously, the chemical shift in the range of octahedral aluminum from ca. 4 ppm to ca. 6 ppm was attributed to the transformation of the hexagonal calcium aluminate hydrates and Sr-rich (Sr,C)3AH6 hydrate into the cubic phase Ca-rich (Sr,C)3AH6 or pure C3AH6 in the hardened Sr-doped cement paste at the age of 7 d. The same 27Al NMR chemical shift was detected at the age of 24 h for the reference hardened undoped Ca7ZrAl6O18 cement paste.

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Kotsay, Galyna, and Irmina Masztakowska. "The Effect of Fine-Ground Glass on the Hydration Process and Properties of Alumina-Cement-Based Composites." Materials 14, no. 16 (August 17, 2021): 4633. http://dx.doi.org/10.3390/ma14164633.

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This paper discusses studies regarding the impact of fine-ground glass additives on the hydration and properties of alumina cement pastes and mortars. Fine-ground glass was added to pastes and mortars instead of high-alumina cement and calcium aluminate cement in quantities of 5% and 10%. The findings are inconclusive as to the impact of glass on the properties of tested alumina cement types. The effect produced via the addition of glass instead of cement depends on the type of alumina cement used. Adding fine-ground glass to high-alumina cement enhances the paste’s density while improving paste and mortar strength. Using the same additive for calcium aluminate cement reduces its density and strength. The addition of glass to high-alumina cement adversely affects its strength at higher temperatures.

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Ovcharenko, Gennadiy, Ekaterina Ibe, Aizhana Sandrasheva, and Artem Viktorov. "Contact strength of C-S-H cement phase." E3S Web of Conferences 97 (2019): 02031. http://dx.doi.org/10.1051/e3sconf/20199702031.

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The object of the study was the cement phase C-S-H – X-ray amorphous calcium hydrosilicates, obtained by steaming at 80°C together limestone and silica at different molar ratios CaO/SiO2 = 0.5; 1.0; 1.5. The contact strength of the C-S-H phase with additions of portlandite, silica and alumina zols, high-aluminate slag was estimated by hyper-pressing method with subsequent destruction. It was established that the contact strength of the cement phase increases in proportion to the specific pressing pressure, the age of samples and inversely the phase basicity reaching 12 MPa. It was evidenced that additives increase the contact strength of the C-S-H stone. The features of the phase formation during the hydration of calcium aluminates were considered. It was established that there is no negative effect of additional porosity on the strength of the stone, because the restructuring of calcium hydroaluminates takes place during hyper-pressing. The specific behavior of low-basic calcium aluminates in a mixture with the C-S-H phase was established in the case of using high-aluminate slag, which consists in additional formation Al(OH)3 gel during the hydration, that is provide an increase in the contact strength of the compositions.

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4

Durczak, Karol, Michał Pyzalski, Tomasz Brylewski, and Agnieszka Sujak. "Effect of Variable Synthesis Conditions on the Formation of Ye’elimite-Aluminate-Calcium (YAC) Cement and Its Hydration in the Presence of Portland Cement (OPC) and Several Accessory Additives." Materials 16, no. 17 (September 3, 2023): 6052. http://dx.doi.org/10.3390/ma16176052.

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In the presented study, ye’elimite-aluminate-calcium (YAC) cement was synthesized. Complete synthesis of crystalline phases was achieved at a temperature of 1300 °C, which is 150 °C lower than the temperature standardly used in the processes of obtaining calcium aluminate cements (CAC). The greatest amount of ye’elimite phase (Klein complex), roughly 87% by mass, was acquired utilizing a sulphur ion transporter derived from artificial dihydrate gypsum obtained in the flue gas desulphurization process (variation I). In the case of anhydrite, the amount of synthesized crystalline ye’elimite in the clinker was 67% by weight (variant II). Depending on the synthesis conditions in the clinkers, the quantity of obtained calcium aluminates (C12A7, CA, and CA2) ranged from 20 to 40% by weight. Studies on the hydration process of YAC cement samples showed that the main products are hydrated calcium aluminates and dodecahydrate calcium alumino-sulphate. In sinters of YAC and OPC, no crystalline ettringite was observed. Hydration analysis of Chinese cement revealed the presence of crystalline ettringite and dodecahydrate calcium alumino-sulphate, as well as hydrated calcium silicates of the CSH type accompanied with pseudo-crystalline Al(OH)3. The obtained clinkers from variants I and II constitute a special binder, which, due to its phase composition after hydration, can be used in the construction of reactors for biogas production in eco-energy applications.

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5

Alobaidi, Eassa, Nawaf Labban, Steven Haug, John A. Levon, David T. Brown, Marco C. Bottino, and Jeffrey A. Platt. "Comparison of Volumetric Dimensional Changes of Calcium Aluminate, Resin Modified Glass Ionomers and Resin Luting Cements Among Different Storage Conditions." Science of Advanced Materials 13, no. 2 (February 1, 2021): 294–301. http://dx.doi.org/10.1166/sam.2021.3859.

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Objective: The aim was to evaluate the volumetric dimensional changes of calcium aluminate glass-ionomer luting agent to resin modified-Glass ionomer cement (RM-GIC), self-etch and conventional resin based cement (RBC) among different storage conditions. Methods: Twenty cylindrical specimens (7 mm × 2 mm) for four cements [Calcium aluminate (Ceramir-CM), RM-GIC (Fuji Plus-FP), RBC (Rely X Ultimate-RA) and RBC-self-etch (Rely X Unicem-RU)] were fabricated and polished. Five specimens from each material were randomly assigned to the four test conditions. These conditions were silicone oil at 22 °C and 37 °C and distilled water at 22 °C and 37 °C respectively. A resolution balance was used to measure the weight of each specimen at 1, 2, 3 and 4 weeks. Archimedes’ principle equations were used to measure volumetric dimensional changes. Ion release analysis for Ca+ and OH- of the storage medium solution of calcium aluminate cement was performed using atomic absorption spectroscopy and pH measurement respectively at 1, 2, 3 and 7 weeks. Data was analyzed using ANOVA and Tukey post hoc test. Results: A significant difference in volumetric changes (ρ < 0.05) was observed for different cements. Calcium aluminate (CM) showed maximum volumetric changes followed by FP. However, resin cements (RA and RU) showed significantly lower volumetric changes. Oil immersion exhibited shrinkage and water immersion showed volumetric expansion in all materials. Increase in duration of immersion, increased the dimensional changes (shrinkage or expansion) among all cement groups (ρ < 0.05). Both temperature and duration showed significant influence on Ca+ ion release. Conclusions: Calcium aluminate cement had the highest level of dimensional changes (17.28% and 20.52%) while both resin luting agents show least expansion without a significant difference between them. Ceramir luting agent expands significantly in water and continues to release Ca2+ ions with time and higher temperature. The clinical use of calcium aluminate cements based on the high dimensional changes observed in the study is debatable.

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Li, Jin Hong, Ling Xin Tong, and Wen Cai Zhou. "Phase Composition, Microstructure and Mechanical Properties of Aluminous Cements Containing Magnesium Aluminate Spinel." Key Engineering Materials 492 (September 2011): 467–71. http://dx.doi.org/10.4028/www.scientific.net/kem.492.467.

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A new type aluminous cement containing magnesium aluminate (MA) spinel was prepared from mixtures of limestone, magnesian and bauxite at different ratios by sintering process. The phase composition, microstructure and mechanical properties of aluminous cements containing magnesium aluminate spinel were investigated in this paper. According to the XRD results, the magnesium aluminate spinel (MA),calcium monoaluminate (CA) and calcium bialuminate (CA2) are the primary phases of the obtained aluminous cements with a small quantity of calcium silicoaluminate (C2AS) and remained alumina (Al2O3). The results of SEM indicate that the MA mainly exist in the shape of octahedron with the length of about 2-5 μm, and it is agglomerated with the tabular or flaky-shaped CA among the obtained aluminous cements. In addition, the compressive strength of castables containing obtained aluminous cements increase obviously with the content of CA rising or the curing time increasing.

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Kamaluddin, Siti, Ines García-Lodeiro, Keita Irisawa, Yoshihiro Meguro, and Hajime Kinoshita. "Strontium in Phosphate-Modified Calcium Aluminate Cement." Key Engineering Materials 803 (May 2019): 341–45. http://dx.doi.org/10.4028/www.scientific.net/kem.803.341.

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Cements have been used to encapsulate low and intermediate level radioactive wastes. Here, phosphate-modified calcium aluminate (CAP) cement is explored as an encapsulant for strontium radioanuclide-containing wastes. Electron microscopy indicates strontium chloride, used in place of strontium radionuclides, increases porosity in CAP possibly due to increased viscosity of CAP cement during mixing. X-ray diffraction analysis detects formation of halite phase suggesting strontium chloride reacts with cement to form sodium chloride not usually detected in CAP systems as well as formation of an amorphous phase in CAP cement when thermally treated at 90°C.

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Shabanova, H. M., A. M. Korohodska, O. O. Hamova, and S. V. S.V. Levadna. "Optimizing the compositions of refractory cements produced using the waste of chemical industry." Voprosy Khimii i Khimicheskoi Tekhnologii, no. 5 (October 2022): 115–21. http://dx.doi.org/10.32434/0321-4095-2022-144-5-115-121.

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The article presents the results of optimization of the quantitative compositions of cobalt-containing calcium-aluminate and barium-aluminate special cements prepared from chemical industry wastes. Based on the obtained experimental data, the coefficients of the polynomial were computed which express the dependence of the ultimate compression strength and the melting temperature on the quantitative ratio of the CaAl2O4, CaAl4O7, and CoAl2O4 phases for calcium-aluminate cement and the quantitative ratio of the ВaAl2O4, ВaAl12O19, CoAl2O4 phases for barium-aluminate cement. The "composition–property" diagrams and the projections of the lines of the same level were plotted for the ultimate compressive strength and the melting temperature of the obtained cements. The following promising areas were selected for the CaO–CoO–Al2O3 system (wt.%): 25–55 CaAl2O4, 15–35 CaAl4O7, and 25–45 CoAl2O4; and for the ВaO–CoO–Al2O3 system (wt.%): 60–20 ВaAl2O4, 10–20 ВaAl12O19, 30–60 CoAl2O4. The main physical-mechanical properties of the developed cements of optimal composition are the following: the fineness of grinding is characterized by the total passage through the sieve No 006; for calcium cements: water-cement ratio of 0.2, the setting time: the initial set of 1 h 10 min, and the final set of 5 h 40 min; the ultimate compression strength after hardening of 28 days of 63 MPa; the for barium cements: water-cement ratio of 0.16; the setting time: the initial set of 1 h 50 min, and the final set of 5 h 00 min; the ultimate compression strength after hardening of 28 days of 66 MPa; and the calculated mass absorption coefficient =175 cm2/g. The refractoriness is 16300C and 17500C for calcium cement and barium cement, respectively.

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Lee, Yunsu, Seungmin Lim, and Hanseung Lee. "Chloride Resistance of Portland Cement-Based Mortar Incorporating High Aluminate Cement and Calcium Carbonate." Materials 13, no. 2 (January 12, 2020): 359. http://dx.doi.org/10.3390/ma13020359.

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Whether chloride resistance is highly influenced by chloride binding capacity remains unknown. In this study, the chloride resistance of Portland cement-based mortar incorporating aluminate cement and calcium carbonate was investigated considering the chloride binding capacity, pore structures and chloride diffusion coefficient from non-steady state chloride migration and natural chloride diffusion. The cement hydrates were investigated using X-ray diffraction and thermogravimetric analysis. The chloride binding capacity was evaluated based on the chloride adsorption from the solutions using the adsorption isotherm. The aluminate cement, as an available alumina source, can stimulate the formulation of layered double hydroxides, which in turn can increase the chloride binding capacity. The results of mercury intrusion porosimetry show that non-substituted (control) and substituted (only aluminate cement) specimens have capillary pore volume 8.9 vol % and 8.2 vol %, respectively. However, the specimen substituted with aluminate cement and calcium carbonate shows a higher capillary volume (12.9 vol %), which correlates with the chloride diffusion coefficient. Although the specimen substituted with calcium carbonate has a higher chloride binding capacity than the control, it does not necessarily affect the decrease in the chloride diffusion coefficient. The capillary pore volume can affect not only the chloride diffusion but also the chloride adsorption.

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Zhao, Jing Ming, Kyu Hong Hwang, Jong Kook Lee, and Min Cheal Kim. "Application of Magnesia-Phosphate Cement for Chromia/Alumina Castables." Applied Mechanics and Materials 268-270 (December 2012): 625–28. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.625.

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Refractory castables containing calcium aluminate cement (CAC) are widely used in a range of furnace lining applications in the iron and steel, cement, glass, ceramic, and petrochemical industries. However, magnesia-phosphate cement (MPC) based material could be a new types of cement material, with many advantages such as rapid hydration, high early strength and circumstance suitability, which has very important value and wide application. In this study, MPC was used at Chromia/Alumina castable as binder addition instead of conventional calcium aluminate cement. Meanwhile, it also explains the relationship between the micro-mechanism and performance by micro methods such as SEM. The results shows that MPC based castables have good corrosion resistance, interface adhesiveness and abrasion resistance.

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Dissertations / Theses on the topic "Calcium Aluminate Cement"

1

Hywel-Evans, Paul Duncan. "The hydration of calcium sulpho aluminate cement." Thesis, Staffordshire University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320692.

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Kraft, Lars. "Calcium Aluminate based Cement as Dental Restorative Materials." Doctoral thesis, Uppsala University, Department of Materials Science, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3070.

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This thesis presents the results from the development process of a ceramic dental filling material based on calcium aluminate cement. The main focus of the work concerns dimensional changes during setting, hardening and curing and the understanding of the factors controlling the dimensional stability of the system. A range of compositions for research purposes and the composition of Doxadent™ – a dental product launched on the Swedish market in October 2000 – were evaluated. Furthermore hardness characteristics, flexural strength, porosity and microstructure studies are presented. The studies of dimensional changes led to a thorough investigation of the measuring devices used and their relevance. A split pin expander technique, very simple in function, has been evaluated and improved. The technique is considered to be adequate for detecting dimensional stability in restrained samples, thus mimicking the case for real fillings in most tooth cavities. The dimensional changes in the calcium-aluminate based cement system are mainly controlled by the grain size, the exact composition and the compaction degree. The expansion of the calcium-aluminate cement system was in the early work decreased from several percent down to only tenths of a percent. Results show that Doxadent™ has less than 0.2% in linear expansion after 200 days of storage in water. However, long-term tests have been unable to verify whether expansion stops with time. Long-term in-vitro studies of dimensional changes also affect the test equipment used, which is why the long-term behavior of the dimensional stability has to be clinically evaluated. The material integrates excellently with the tooth structure, has hardness and thermal properties similar to those of enamel and dentine, and is also biocompatible during hardening. A patented process for the preparation of wet compacted specimens was also developed.

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Zamri, Diyana. "Biogenic and chemical corrosion of calcium aluminate cement in sour media." Thesis, The University of Sydney, 2012. http://hdl.handle.net/2123/19260.

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Kirca, Onder. "Temperature Effect On Calcium Aluminate Cement Based Composite Binders." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607454/index.pdf.

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In calcium aluminate cement (CAC) systems the hydration process is different than portland cement (PC) systems. The hydration products of CAC are subjected to conversion depending on temperature, moisture, water-cement ratio, cement content, etc. Consequently, strength of CAC system can be seriously reduced. However, presence of other inorganic binders or additives may alter the hydration process and improve various properties of CAC based composites. The objective of this study is to investigate the temperature effect on the behaviour of CAC based composite binders. Throughout this research, several combinations of CAC-PC, CAC-gypsum, CAC-lime, CAC-ground granulated blast furnace slag (CAC-GGBFS) were studied. These CAC based composite binders were subjected to seven different curing regimes and their strength developments were investigated up to 210 days. In addition, the mechanism of strength development was examined by XRD analyses performed at 28 and 210 days. Finally, some empirical relationships between strength-time-curing temperatures were formulated. Experimental results revealed that the increase in ambient temperature resulted in an increase in the rate of conversion, thereby causing drastic strength reduction, particularly in pure CAC mix. It has been observed that inclusion of small amount of PC, lime, and gypsum in CAC did not induce conversion-free CAC binary systems, rather they resulted in faster conversion by enabling rapid formation of stable C3AH6 instead of metastable, high strength inducing CAH10 and C2AH8. On the other hand, in CAC-GGBFS mixes, the formation of stable straetlingite (C2ASH8) instead of calcium aluminate hydrates hindered the conversion reactions. Therefore, CAC-GGBFS mixes, where GGBFS ratio was over 40%, did not exhibit strength loss due to conversion reactions that occurred in pure CAC systems.

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Sunnegårdh-Grönberg, Karin. "Calcium aluminate cement as dental restorative : Mechanical properties and clinical durability." Doctoral thesis, Umeå universitet, Tandhygienistprogrammet, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-270.

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In 1995, the Swedish government recommended the discontinuation of amalgam as restorative in paediatric dentistry. Because the mercury content in amalgam constitutes an environmental hazard, its use has declined. The use of resin composites is increasing, but the polymerisation shrinkage of the material is still undesirably high, and the handling of uncured resin can cause contact dermatitis. A new restorative material has recently been developed in Sweden as an alternative to amalgam and resin composite: a calcium aluminate cement (CAC). CAC has been marketed as a ceramic direct restorative for posterior restorations (class I, II) and for class V restorations. This thesis evaluates mechanical properties and clinical durability of the calcium aluminate cement when used for class II restorations. Hardness, in vitro wear, flexural strength, flexural modulus, and surface roughness were evaluated. A scanning electron replica method was used for evaluation of the interfacial adaptation to tooth structures in vivo. The durability was studied in a 2-year intra-individually clinical follow-up of class II restorations. Major results and conclusions from the studies are as follows: • The CAC was a relatively hard material, harder than resin-modified glass ionomer cement but within the range of resin composites. The CAC wore less than resin-modified glass ionomer cement but more than resin composite. • Flexural strength of CAC was in the same range as that of zinc phosphate cement and far below that of both resin composite and resin-modified glass ionomer cement. Flexural modulus of CAC was higher than both resin composite and resin-modified glass ionomer cement. The low flexural strength of CAC precludes its use in stress-bearing areas. • Surface roughness of CAC could be decreased by several polishing techniques. • For CAC restorations, interfacial adaptation was higher to dentin but lower to enamel compared with resin composite restorations. Fractures were found perpendicular to the boarders of all CAC restorations and may indicate expansion of the material. • After 2 years of clinical service, the class II CAC restorations showed an unacceptably high failure rate. Material fractures and tooth fractures were the main reasons for failure.

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Sunnegårdh-Grönberg, Karin. "Calcium aluminate cement as dental restorative : mechanical properties and clinical durability /." Umeå : Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-270.

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Swift, Paul David. "The development of calcium aluminate phosphate cement for radioactive waste encapsulation." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/5782/.

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Reactive metals such as aluminium metal make up a significant proportion of the UK’s legacy radioactive waste. Current treatment methods – encapsulation in PC-based cementitious systems – do not perform optimally when applied to reactive metals. Corrosion of encapsulated aluminium, caused by the availability of free-water and highly alkaline pore solution, results in expansive corrosion products and the generation of significant quantities of hydrogen gas, which compromises the long-term performance of waste packages. Calcium Aluminate Phosphate cements (CAP), formed from acid-base reaction between Calcium Aluminate Cements (CAC) and an acidic phosphate-based solution, were identified as alternative encapsulants that provide different internal chemistry i.e. pore solution of lower pH which may be advantageous when applied to the encapsulation of reactive metals. Various types of phosphates, monophosphates and polyphosphates, were assessed to identify suitable pre-cursor materials for producing a cementitious matrix when mixed with CAC, and a CAP formulation envelope suitable for the industry-defined processing and operational property requirements, was identified. The corrosion behaviour of aluminium encapsulated in the CAP system was characterised by a dormant period, during which the corrosion and gas generation rates were very low, and a significant increase after the dormant period. The phase evolution of the CAP system altered not only the physico-mechanical properties of the system in longer-term but was also responsible for the latent corrosion behaviour of aluminium encapsulated in the CAP system.

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Sio, Jeanette Dorol. "Influence of Pozzolanic Material in the Conversion and Corrosion Behaviour of Calcium Aluminate Cement." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12694.

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Calcium aluminate cement (CAC) is used as a protective lining to combat attack by microorganisms and their metabolic products on reinforced concrete sewer pipes. CAC corrosion behaviour is related to the conversion process of the aluminate hydrates. Full conversion can result to a 5-8 times increase in corrosion rate. Hence, understanding and controlling the rate and the processes that affect conversion is important in the effective use of CAC as a mitigation strategy against the attack of microorganisms. This study was focussed on the role of the pozzolanic material, i.e. fly ash, in suppressing the conversion of CAC. CAC mortars were prepared with constant water-cement ratio of 0.4 and with fly ash contents of 0%, 5%, and 25% weight. To assess the effectiveness of the fly ash, CAC mortars were cured at high temperatures (80-100oC) in water bath to accelerate conversion. Thermal analysis (TGA), X-Ray diffraction (XRD), and scanning electron microscopy (SEM) with integrated EDS and EBSD system were used to monitor the physical and mineralogical transformation of CAC during the conversion and leaching tests. Our study showed that pozzolanic materials have negative and positive impacts in CAC. Based on thickness loss, addition of fly ash improved the corrosion resistance of CAC. This can be attributed to the increased formation of the stratlingite (C2ASH8) that was found to be resistant to both organic and mineral acids. However, analysis based on weight loss and dissolved Al metal showed that addition of fly ash suppresses early corrosion but later corrosion is increased, which is attributed to greater formation of C3AH6 and greater porosity.

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Gosselin, Christophe. "Microstructural development of calcium aluminate cement based systems with and without supplementary cementitious materials /." Lausanne : EPFL, 2009. http://library.epfl.ch/theses/?nr=4443.

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Thèse Ecole polytechnique fédérale de Lausanne EPFL, no 4443 (2009), Faculté des sciences et techniques de l'ingénieur STI, Programme doctoral Sciences et Génie des matériaux, Institut des matériaux IMX (Laboratoire des matériaux de construction LMC). Dir.: Karen Scrivener.

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Alex, Jennifer. "Effect of sodium on the microstructure and properties of calcium aluminate cement bonded refractories." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/31583.

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Additions of 0.1 - 1.0 wt% Na on Al2O3-CaO and Al2O3-CaO-SiO2 model refractory castable systems were investigated with respect to the effect on formation characteristics, and mechanical properties of the consolidated refractory. In the Al2O3-CaO system, sodium is shown to form sodium β-alumina (NaβA) via the intermediate NaAlO2. Formation of NaβA disrupts the reaction path of calcia (CaO) with alumina (Al2O3), delaying crystallisation of calcium hexaluminate (CA6) from 1350 to 1500 °C. The linear expansion associated with NaβA is quantified and is shown to scale with the amount of dopant added: addition of 1 wt% Na leads to up to 47% additional expansion. The preferential formation of NaβA, rather than CA6, delays sintering and reduces the elastic modulus of systems with > 0.3 wt% additional Na as a consequence of a reduction of particle cohesion. With regards to the consolidated (i.e. heat treated) model castable, the system was able to tolerate addition of 0.3 wt% Na without a significant reduction in stiffness. Addition of 0.3 wt% Na had no negative effect on flexural strength of the formulation and up to ≤ 0.5 wt% Na does not affect creep resistance of the consolidated samples. NaβA formation was shown to result in enhanced internal friction, likely caused by Na+ ion hopping through the spinel-like planes of the NaβA. During long exposures to 1500 °C, sodium is lost from the samples as shown by quantification of NaβA and the internal friction peak associated with this phase. In the system Al2O3-CaO-SiO2 sodium leads to formation of nepheline (Nep, C2AS) and soda-anorthite (Na-An, Na-CAS2). Up to 1100 °C the system can tolerate the addition of 0.5 wt% Na with regards to elastic modulus and linear thermal expansion. At higher temperatures, the formation of a viscous phase leads to a significant deterioration of the creep resistance.

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Books on the topic "Calcium Aluminate Cement"

1

Commission, United States International Trade. Calcium aluminate flux from France. Washington, DC: U.S. International Trade Commission, 1994.

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United States International Trade Commission. Calcium aluminate flux from France. Washington, DC: U.S. International Trade Commission, 1994.

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J, Mangabhai R., and Glasser F. P, eds. Calcium aluminate cements 2001: Proceedings of the International Conference on Calcium Aluminate Cements (CAC) held at Heriot-Watt University Edinburgh, Scotland, UK, 16-19 July 2001. London: IOM Communications, 2001.

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United States International Trade Commission. Certain calcium aluminate cement and cement clinker from France. Washington, DC: U.S. International Trade Commission, 1994.

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United States International Trade Commission. Certain calcium aluminate cement and cement clinker from France. Washington, DC: U.S. International Trade Commission, 1993.

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United States International Trade Commission. Certain calcium aluminate cement and cement clinker from France. Washington, DC: U.S. International Trade Commission, 1993.

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1918-1988, Midgley H. G., and Mangabhai R. J, eds. Calcium aluminate cements: Proceedings of the international symposium held at Queen Mary and Westfield College, University of London, July 9-11, 1990, and dedicated to the late Dr. H.G. Midgley. London: Chapman and Hall, 1990.

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MANGABHAI, R. J. Calcium Aluminate Cements. Abingdon, UK: Taylor & Francis, 1990. http://dx.doi.org/10.4324/9780203473245.

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J, Mangabhai R., and International Symposium [on Calcium Aluminate Cements] (1990 : London), eds. Calcium aluminate cements: Proceedings of the international symposium held at Queen Mary and Westfield College, University of London, 9-11 July 1990,and dedicated to the late Dr. H.G. Midgley. London: Spon, 1990.

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(Editor), F. Glasser, and R. J. Mangabhai (Editor), eds. Calcium Aluminate Cements. Maney Publishing, 2001.

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Book chapters on the topic "Calcium Aluminate Cement"

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Zapata, John F., Maryory Gomezc, and Henry A. Colorado. "Characterization of Two Calcium Aluminate Cement Pastes." In Ceramic Transactions Series, 491–503. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119407270.ch45.

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Claramunt, Josep, Lucia Fernandez-Carrasco, and Mònica Ardanuy. "Mechanical Performance of Flax Nonwoven-Calcium Aluminate Cement Composites." In Strain-Hardening Cement-Based Composites, 375–82. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1194-2_44.

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Le Saout, G., R. Idir, and J. C. Roux. "Characterisation of Perovskites in a Calcium Sulfo Aluminate Cement." In Springer Proceedings in Earth and Environmental Sciences, 339–43. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22974-0_82.

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Heras Diez, Raul, Inmaculada Rodríguez Cantalapiedra, Judit Ramírez-Casas, Antonia Navarro-Ezquerra, and Andreu Corominas. "Application of Machine Learning Approaches to Predict Calcium-Aluminate Cement." In Lecture Notes in Civil Engineering, 131–46. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2714-2_8.

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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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Hou, Dongshuai. "Models for the Cross-Linked Calcium Aluminate Silicate Hydrate (C–A–S–H) Gel." In Molecular Simulation on Cement-Based Materials, 131–57. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8711-1_6.

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Auvray, J. M., C. Zetterström, C. Wöhrmeyer, H. Fryda, C. Parr, and C. Eychenne-Baron. "Dry-Out Simulation of Castables Containing Calcium Aluminate Cement under Hydrothermal Conditions." In Proceedings of the Unified International Technical Conference on Refractories (UNITECR 2013), 159–64. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118837009.ch28.

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Hermansson, Leif, Adam Faris, Gunilla Gómez-Ortega, Emil Abrahamsson, and Jesper Lööf. "Calcium-Aluminate Based Dental Luting Cement With Improved Sealing Properties - an Overview." In Advances in Bioceramics and Porous Ceramics III, 27–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470944028.ch3.

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Li, Zhiyuan, and Panpan Zhang. "Study on hydration properties and products of Portland cement/calcium aluminate cement blends in negative temperature." In Advances in Energy Materials and Environment Engineering, 266–72. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003332664-38.

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Swift, P., H. Kinoshita, and N. C. Collier. "The Effect of Supplementary Pulverised Fuel Ash on Calcium Aluminate Phosphate Cement for Intermediate-Level Waste Encapsulation." In Cement-Based Materials for Nuclear Waste Storage, 215–24. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-3445-0_19.

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Conference papers on the topic "Calcium Aluminate Cement"

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Ahmed, Syed Taqi Uddin, and Shaik Kareem Ahmmad. "Density and mechanical properties of calcium aluminate cement." In DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5028815.

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Scheinherrová, Lenka, and Anton Trník. "Hydration of calcium aluminate cement determined by thermal analysis." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4994514.

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"Analysis Of A Jointless Floor With Calcium Sulpho-Aluminate And Portland Cement." In SP-305: Durability and Sustainability of Concrete Structures. American Concrete Institute, 2015. http://dx.doi.org/10.14359/51688609.

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Bilic, Fatima Dugonjic, Constantin Tiemeyer, and Johann Plank. "Study On Admixtures For Calcium Aluminate Phosphate Cement Useful To Seal CCS Wells." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 2011. http://dx.doi.org/10.2118/141179-ms.

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Berard, Brian, Rafael Alberto Hernandez, and Hao Nguyen. "Foamed Calcium Aluminate Phosphate Cement Enables Drilling and Cementation of California Geothermal Wells." In SPE Western Regional Meeting. Society of Petroleum Engineers, 2009. http://dx.doi.org/10.2118/120845-ms.

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Koňáková, Dana, Kateřina Šádková, Eva Vejmelková, Vojtěch Pommer, and Robert Černý. "Thermal properties of heat resistant composites based on calcium aluminate cement: The effect of plasticizers." In IV INTERNATIONAL SCIENTIFIC FORUM ON COMPUTER AND ENERGY SCIENCES (WFCES II 2022). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0170862.

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Al Dandan, Esam, and Md Mofazzal Hossain. "Understanding of Geochemical Reactions in Hydrogen-Injected Wells: Cement Integrity for Safe Underground Hydrogen Storage." In International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-23620-ms.

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Abstract As the world transitions to clean energy sources, Underground Hydrogen Storage (UHS) has emerged as a leading solution for large-scale hydrogen storage. While the depleted oil or gas reservoirs are ideal for UHS, the effect of geochemical reactions among injected hydrogen, wellbore, and cement is not documented. This study aims to assess cement and well integrity by examining the geochemical interaction between API cement and hydrogen near the wellbore under varying temperature and pressure conditions. The numerical simulation was carried out to study the geochemical reaction between hydrogen and API class G/H cement minerals using the PHREEQC version 3 simulator. The dissolution reactions of hydrogen with the initial cement components, namely calcium tetra calcium alumino-ferrite (C4AF), tricalcium aluminate (C3A), tricalcium silicate (C3S), and dicalcium silicate (C2S) were modelled at various pressure and temperature conditions. The simulation assumed continuous cement hydration over an infinite time to assess the long-term effects of hydrogen-cement interactions and its impact on cement integrity near the wellbore. Based on this numerical simulation, we found that at 56.2oC, the formation of calcium silicate hydrate(CSH), portlandite, C3AH6, Mackinawite, magnetite, and hydrotalcite. At 95°C, similar minerals were formed with slightly higher amounts of CSH and slightly less portlandite, while others did not exhibit a noticeable difference. At 119°C, it was observed that a noticeable increase in CSH and a noticeable reduction in portlandite amount. Additionally, the formation of ettringite was observed at elevated temperatures. These findings highlight the temperature- dependent changes in mineral composition near the wellbore, which may have implications for the long-term integrity of the cement matrix in hydrogen-affected environments. Based on comprehensive numerical simulation studies, this paper highlights critical insights for a better understanding of hydrogen-cement interactions in the context of underground hydrogen storage, and its impact on the long-term-integrity of wellbores in hydrogen storage application, essential for enhancing the knowledge base for safe and effective implementation of underground hydrogen storage technologies.

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Reny, Simon, and Nicolas Ginouse. "Development of a rapid strength gain dry-mix shotcrete using calcium sulfo-aluminate cement for mining and tunnelling applications." In Seventh International Conference on Deep and High Stress Mining. Australian Centre for Geomechanics, Perth, 2014. http://dx.doi.org/10.36487/acg_rep/1410_18_reny.

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Vrålstad, Torbjørn, Ragnhild Skorpa, Nils Opedal, Jelena Todorovic, Nicolaine Agofack, and Nguyen-Hieu Hoang. "Cement Sheath Integrity During High Temperature Geothermal Well Operations." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-65116.

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Abstract Development of geothermal energy sources is an important contribution to ensure the “green shift” from fossil fuels to more sustainable sources of energy. Currently, most geothermal wells operate at temperature range of 150–300° C, but development of super-high temperature geothermal reservoirs may be needed to increase power production. However, the high temperature conditions to be found in such wells, up to 400–500 °C, are very challenging and may be detrimental for the integrity of well cement. In this paper, several cement integrity challenges for high temperature geothermal wells are reviewed, such as mechanical failures during well start-up and potential shut-in periods, and long-term issues caused by chemical alterations of the cement during high temperature exposure. Experimental tests have been performed with two different, potential geothermal well cement systems: a Portland-based system with silica flour and MicroSilica as additives, and a non-Portland, calcium aluminate cement system. For both cement systems, high temperature ageing tests have been performed at 500 °C for 8 weeks, where unconfined mechanical properties were determined before and after exposure. Furthermore, down-scaled tests of radial crack formation in casing-cement-rock samples have been performed, as simplified functions tests of cement sheath integrity during well start-up.

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""Durability of Calcium Aluminate Cement Concrete: Assessment of Concrete From a 60-Year Old Marine Structure at Halifax, NS, Canada"." In "SP-154: Advances in Concrete Technology - Proceeding Second CANMET/ ACI International Symposium - Las Vegas, Nevada, USA". American Concrete Institute, 1995. http://dx.doi.org/10.14359/954.

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Reports on the topic "Calcium Aluminate Cement"

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Langton, C., and D. Stefanko. BLENDED CALCIUM ALUMINATE-CALCIUM SULFATE CEMENT-BASED GROUT FOR P-REACTOR VESSEL IN-SITU DECOMMISSIONING. Office of Scientific and Technical Information (OSTI), March 2011. http://dx.doi.org/10.2172/1011327.

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SUGAMA, T., and L. E. BROTHERS. CITRIC ACID AS A SET RETARDER FOR CALCIUM ALUMINATE PHOSPHATE CEMENTS. Office of Scientific and Technical Information (OSTI), January 2005. http://dx.doi.org/10.2172/15011163.

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