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Добірка наукової літератури з теми "Cement compositions"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Cement compositions"

Fontaine, Marie-Laure, Christèle Combes, Thierry Sillam, Gérard Dechambre, and Cristian Rey. "New Calcium Carbonate-Based Cements for Bone Reconstruction." Key Engineering Materials 284-286 (April 2005): 105–8. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.105.

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The feasibility of calcium carbonate-based cements involving the re-crystallization of metastable calcium carbonate varieties has been demonstrated. Two cement compositions were obtained by mixing either calcium carbonate phases (cement A) or a calcium carbonate and a calcium phosphate phase (cement B) with an aqueous media. These cements set and hardened after 30 minutes and 90 minutes respectively. The final composition of cement A was calcite and aragonite whereas cement B lead to a carbonated apatite analogous to bone mineral. Despite poor mechanical properties the presence of a high carbonate content in the final phase might be of interest to increase the cement resorption rate and to favour its replacement by bone tissue. First assays of implantation performed on fresh anatomical pieces (fresh cadavers) at 37°C revealed important advantages of such cement compositions: easiness of use, rapid setting, good adhesion to bone, very good homogeneity and stability of the cement.

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GHABEZLOO, SIAVASH. "MULTISCALE MODELING OF THE POROELASTIC PROPERTIES OF VARIOUS OIL-WELL CEMENT PASTES." Journal of Multiscale Modelling 02, no. 03n04 (September 2010): 199–215. http://dx.doi.org/10.1142/s1756973710000412.

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Evaluation of the poroelastic properties of oil-well cement paste is essential for prediction of the performance of the cement sheath during the life of a well. A multiscale homogenization model is used to evaluate the poroelastic properties of different classes of oil-well cement paste. The model has been calibrated in a previous work based on the results of a laboratory study on a hardened class G cement paste. A hydration model is used to evaluate the volume fractions of different microstructure phases of cement paste based on the chemical composition of clinker and the water-to-cement ratio. Typical chemical compositions of API class A to class H oil-well cements with their corresponding water-to-cement ratios are used to evaluate the poroelastic parameters such as drained bulk modulus, Biot coefficient, Skempton coefficient, etc. The results show that the difference in the chemical compositions of these cements has not an important effect on the variations of the poroelastic properties. Contrarily, the water-to-cement ratio has an important effect on the variations of these parameters.

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Chulkova, I. L., I. A. Selivanov, and V. D. Galdina. "INFLUENCE OF THE SCOPE ADDITION ON THE STRUCTURE FORMATION OF THE CEMENT STONE BY THE METHOD OF QUANTITATIVE X-RAY PHASE ANALYSIS." Russian Automobile and Highway Industry Journal 16, no. 4 (September 8, 2019): 504–18. http://dx.doi.org/10.26518/2071-7296-2019-4-504-518.

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Introduction. The processes of structure formation of cement compositions and the development of effective technologies of building materials is an urgent task for building material science. The use of large-scale man-made product of pulp and paper enterprises – osprey as a fibrous filler in organic and mineral compositions is the successful decision of the problem. The paper analyzes the ways of using osprey in the building materials’ production. The aim of the research is to study the osprey influence on the processes of structure formation of cement stone by quantitative x-ray phase analysis.Materials and methods. The organic and mineral compositions were obtained on the basis of portland cement and osprey. The authors studied the compositions’ phase of osprey, portland cement and the processes of cement stone structure formation in organ and mineral compositions by quantitative x-ray phase analysis.Results. The authors determined the compositions’ phase of mineral impurities of osprey, cellulose, cement, cement stone, organic and mineral compositions and two compositions containing 25 and 75% by weight.Discussion and conclusions. The osprey application as a filler in the organic and mineral composition causes inhibition of processes of cement hydration. The presence of osprey in the hardening organic and mineral composition leads to a change in the composition and structure of the cement stone in comparison with the phase composition of the cement stone without additives. The result of these changes is a significant increase in the amount of calcite, waterite and a significant decrease in the amount of portland. The authors establish that the effective joint work of the reinforcing component of the osprey with the cement matrix is possible with a limited amount of osprey in organic and mineral compositions.

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Sanytsky, Myroslav, Tetiana Kropyvnytska, and Roman Kotiv. "Modified Plasters for Restoration and Finishing Works." Advanced Materials Research 923 (April 2014): 42–47. http://dx.doi.org/10.4028/www.scientific.net/amr.923.42.

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The paper is devoted to the research and development of modified plasters for restoration and finishing works based on decorative multicomponent cements containing white Portland cement and supplementary cementitious materials (silica fume, metakaolin and fine ground limestone). This cements are similar to Roman cement by their chemical composition. The use of optimal granulometry of decorative multicomponent cements provide directed formation of microstructure of the cement matrix with the formation of stable hydration products. Compositions of modified plasters by the criterions of workability and compressive strength were designed. Physico-chemical modification of plaster by complex air-entraining admixture allows to obtain high-quality modified plasters with improved quality parameters.

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Bediako, Mark, and Eric Opoku Amankwah. "Analysis of Chemical Composition of Portland Cement in Ghana: A Key to Understand the Behavior of Cement." Advances in Materials Science and Engineering 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/349401.

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The performance of Portland cement in concrete or mortar formation is very well influenced by chemical compositions among other factors. Many engineers usually have little information on the chemical compositions of cement in making decisions for the choice of commercially available Portland cement in Ghana. This work analyzed five different brands of Portland cement in Ghana, namely, Ghacem ordinary Portland cement (OPC) and Portland limestone cement (PLC), CSIR-BRRI Pozzomix, Dangote OPC, and Diamond PLC. The chemical compositions were analyzed with X-Ray Fluorescence (XRF) spectrometer. Student’st-test was used to test the significance of the variation in chemical composition between standard literature values and each of the commercial cement brands. Analysis of variance (ANOVA) was also used to establish the extent of variations between chemical compositions and brand name of the all commercial Portland cement brands. Student’st-test results showed that there were no significant differences between standard chemical composition values and that of commercial Portland cement. The ANOVA results also indicated that each brand of commercial Portland cement varies in terms of chemical composition; however, the specific brands of cement had no significant differences. The study recommended that using any brand of cement in Ghana was good for any construction works be it concrete or mortar formation.

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Mihailescu, Dan, Dana Nicoleta Mihai, Liliana Savin, Lavinia Vasiliu, Victor Grigorescu, Alexandru Patrascu, and Marcel Ionel Popa. "Polymeric Biomaterials with Complimentary Role in Joint Endoprosthesis. II. Compositional and morpho-structural analysis." Materiale Plastice 56, no. 3 (September 30, 2019): 611–15. http://dx.doi.org/10.37358/mp.19.3.5239.

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Successfully used in bone surgery for more than 65 years, self-hardening organic cements (CCOs), in particular acrylic cements, are today, the most advanced complementary biomaterials used in articular endoprosthesis. One of the strategies for obtaining of performing anchorage of artificial implants is to develop new acrylic cements with improved physical, chemical and biomechanical characteristics. The aim of this paper was to identify the compositional and morpho-structural changes of acrylic cements induced by the composition of the liquid phase of the material. Such changes influence the potential to generate the physical bonds responsible for fixation and stabilization of endoprosthesis. The samples studied had different compositions due to the mixture of acrylic monomers, methyl methacrylate (MMA) and butyl acrylate (BuA) in the liquid component of cement. The MMA / BuA ratio varied between 1/0 v / v and 1/4 v / v. Changes in the composition and morphology of cement samples have been highlighted by ESCA (Electron Spectroscopy for Chemical Analysis), EDX (Energy-Dispersive X-ray Spectroscopy), IR spectroscopy and SEM images. The obtained data show that minor changes in cement composition can significantly influence morpho-structural characteristics such as pore size and their distribution in the mass of fixing material.

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Kozlova, Irina, Olga Zemskova, and Vyacheslav Semenov. "The Effect of Fine Dispersed Slag Component on the Slag Portland Cement Properties." Materials Science Forum 1011 (September 2020): 103–8. http://dx.doi.org/10.4028/www.scientific.net/msf.1011.103.

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Cement compositions based on slag Portland cement and fine dispersed slag component are considered. It has been established that the introduction of 1-3% fine slag obtained as a result of ultrafine grinding in a jet mill into the slag Portland cement composition provides an increase in the strength and structural characteristics of cement stone from the first day of hardening, which is important for slag cements. To ensure the fine dispersed slag particles’ stabilization in the cement matrix, the cement compositions were sealed with water with the addition of a plasticizer on either sulfa-naphthalene formaldehyde or polycarboxylate substrates in an amount of 0.5% of the cement composite content. In the research course it was found that in the initial stages of hardening and grade age, the strength of the samples containing a fine dispersed slag component and a sulfa-naphthalene formaldehyde-based plasticizer increased by 20%. When the cement composition is mixed with water with a polycarboxylate-based plasticizer, an increase in strength in the initial period of hardening by 60% is noted, at the vintage age - by 30%. At the same time, the porosity of the samples based on slag Portland cement with the addition of fine dispersed slag and one of the plasticizers in the initial period was reduced by 16-21%, at the vintage age - by 33-35%.

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Zagoronyuk, L., S. Rahimbaev, D. Sumskoy, and V. Ryzhikh. "FEATURES OF THE PROCESSES OF HYDRATION OF BINDING COMPOSITIONS USING WASTE OF EXPANDED PERLITE SAND." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 5, no. 11 (December 4, 2020): 75–88. http://dx.doi.org/10.34031/2071-7318-2020-5-11-75-88.

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The results of studying the processes of hydration of binder compositions obtained at different ratios of cement and waste of expanded perlite sand (from 5 to 10%), in a vortex jet mill, under different modes of mechanical and chemical activation - from one to three passes are presented. Comprehensive studies of hydration products by X-ray phase analysis and electron microscopy indicate that the use of highly dispersed wastes from the production of expanded perlite sand in binding compositions allows an increase in the content of hydrated neoplasms due to an increase in the degree of hydration of the main clinker phases, as well as due to the pozzolanic activity of these wastes. The contact zone between the hydrated compounds and the remnants of the grains of the original cements has a special effect on the formation of a high-strength structure of the cement stone. The structure formation of a cement stone depends on a number of factors, which can be influenced by various technological methods. When designing compositions of cement composites, it is necessary to ensure that hydration products in the created system are present along with low-basic calcium hydrosilicates and high-basic ones. Their ratio should be such that carbonization does not reduce the volume of the formed crystalline phase of the cement stone. The composition of the hydration products determines the level of supersaturation of the solution, the type and number of impurities soluble in water, the duration of the hydration process, etc. The chemistry of the reactions of the hydrated system changes accordingly. It is found that the intensity of the diffraction maxima, indicating the presence of highly basic calcium hydrosilicates in the compositions that underwent mechanical activation, increases by 18% in comparison with the ordinary PC. The strength characteristics of Portland cements, which have undergone mechanical activation, increase up to 15% compared to the original PC. The most rational binder composition is established in terms of composition (No. 6), mechanical activation and maximum compressive strength at 28 days of age – 69.1 MPa.

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Rodin, Alexander, Sergej Karpushin, and Vasiliy Smirnov. "Cement Composites’ Biostability." Materials Science Forum 1011 (September 2020): 171–78. http://dx.doi.org/10.4028/www.scientific.net/msf.1011.171.

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The studies to establish the species composition of micro-mycetes inhabiting the surface of cement composites after aging in sea water have been carried out. Cement stone made on the basis of Portland cement clinker, a mineral additive and a fungicidal preparation was considered as the studied material. To determine the materials’ fouling by microorganisms, their species composition, imprints and sampling methods were used. A change in the species composition of mycobiota isolated from the cement composites’ surface modified with sodium sulfate and sodium fluoride depending on the amount of active filler, gypsum, and biocidal additives was experimentally revealed. The effectiveness of using the biocidal cement composites with an active mineral additive has been confirmed. It was found that the composites on the developed compositions showed higher resistance compared to the materials on ordinary cement. The compositions modified with biocidal additives showed a fungicidal effect.

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Guryanov, A. M., S. F. Korenkova, and Yu V. Sidorenko. "STRUCTURE FORMATION PROCESS OF HYDRATED PORTLAND CEMENT COMPOSITIONS: NANOSCALE LEVEL CONTROL." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 3 (June 15, 2017): 77. http://dx.doi.org/10.17770/etr2017vol3.2618.

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Durability of cement-like construction materials, as well as durability of cement stone, depends on their humidity resistance, frost resistance, corrosion resistance. All of these properties depend not only on the composition of the original clinker, but also on structural organization at micro-and nanoscale level of hydrated portland cement compositions. In this research the authors used the method of small-angle neutron scattering to define structural parameters of hydrated portland cement compositions on nanoscale level, distribution of calcium hydrate silicate nanoparticles in size, medium nanoparticles radius, fractal dimension. It is shown, that introduction of modifying nanoadditives into portland cement compositions affects structural parameters of a cement stone. The following nanoadditives were used: of artificial (alpha aluminium oxide, gamma aluminum oxide) and of anthropogenic (carbonate and alumo-alkaline sludges) origin, as well as integrated nanoadditives containing surfactants. The change in structural parameters of portland cement compositions with nanoadditives in the process of hydration is investigated. It is shown that use of nanoadditives allows to control the process of forming the structure of hydrated portland cement composition on the nanoscale level, directly affect the values of structural parameters and, as a result, modify properties of cement stone.

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Більше джерел

Дисертації з теми "Cement compositions"

Boursier, Thomas. "Synthèse et caractérisation de copolymères à base d’acide méthacrylique et de nouveaux macromonomères hydrophiles : rôle de leur solvatation sur la fluidité et la viscosité des compositions cimentaires." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10006.

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Le but de cette thèse est d'évaluer le rôle de la solvatation des PCP (copolymère greffé utilisé en tant qu'additif du béton) sur la fluidité et la viscosité des bétons. Pour répondre à cette problématique, des copolymères greffés différant par la nature chimique des chaînes latérales sont synthétisés. L'état de solvatation des PCP est évalué à l'aide du paramètre de Flory-Huggins χ. Ce dernier est calculé à partir du 2nd coefficient du viriel A2, déterminé par diffusion de la lumière. Des valeurs du paramètre χ de 0,37 ; 0,43 ; 0,47 et 0,48 ont été obtenues pour des PCP comportant des chaînes latérales à base d'éthylène glycol (EG), de 2-méthyloxazoline (MOx), de N-vinylpyrrolidone (NVP) et de N-acryloylmorpholine (NAM), respectivement. Le pouvoir couvrant des PCP et leur épaisseur de couche peuvent être calculés par l'intermédiaire d'une formule proposée par Flatt. L'introduction des PCP à différents dosages (donc différents taux de recouvrement) à des suspensions de calcite a permis de montrer qu'à même taux de recouvrement de surface, tous les PCP induisaient la même fluidité, alors que l'épaisseur de couche de PCP diffère de plus de 50% dans les cas les plus extrêmes. Le taux de recouvrement de surface joue un rôle tout aussi important en ce qui concerne la viscosité des suspensions. Appliquer ces conclusions sur un mortier s'avère délicat car les PCP pourraient entrainer des retards d'hydratation différents en fonction de la nature des chaînes latérales
The objective of this PhD work is the evaluation of the role of the solvation of PCP (grafted copolymer used in concrete as additive) on the concrete fluidity and viscosity. Grafted copolymers with different side-chains were synthesized. The solvation state of the PCP was estimated by mean of the χ Flory-Huggins parameter. The latter was calculated from the 2nd virial coefficient A2, itself determined by light scattering measurements. χ -parameter values of 0,37 ; 0,43 ; 0,47 and 0,48 are obtained for PCP respectively possessing ethylene glycol (EG), 2-methyloxazoline, N-vinylpyrrolidone and N-acryloylmorpholine-based side-chains. The surface coverage of the PCPs and their layer thickness can be calculated with Flatt’s formula. The introduction of the PCPs at different contents (therefore different surface coverage ratio) to calcite suspensions showed that at same surface coverage ratio, all PCPs induce the same fluidity, although the adsorbed PCP layer thickness differed up to 50% in the certain cases. The surface coverage played also a keyrole in the suspensions viscosity. The transposition of these results to a mortar seemed however risky since PCPs might lead to hydration delays depending on the chemical nature of the side-chains

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Namango, Saul Sitati. "Development of cost effective earthen building material for housing wall construction: investigations into the properties of compressed earth blocks stabilized with sisal vegetable fibres, cassava powder and cement compositions." [S.l.] : [s.n.], 2006. http://se6.kobv.de:8000/btu/volltexte/2006/6.

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Шумейко, Віта Миколаївна. "Цементвмісні композиції з модифікуючими добавками для неформованих мас". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/39051.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.11 – технологія тугоплавких неметалічних матеріалів. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2018 р. Дисертаційна робота присвячена вирішенню науково-практичної задачі по розробці рецептурно-технологічних параметрів отримання неформованих мас цементвмісних композицій з використанням фізико-хімічних особливостей модифікуючих добавок, які сприяють формуванню щільної і міцної структури цементного каменю і забезпечують покращення експлуатаційних властивостей. За удосконаленою методикою синтезовано полікарбоксилатні добавки, знижуючи їх собівартість по відношенню до відомих суперпластифікаторів і встановлено перспективність їх використання в цементвмісних композиціях для отримання матеріалів з підвищеними фізико-механічними властивостями. Досліджено кремнеземвмісні відходи, які утворюються при виробництві фосфоровмісних добрив, та показано еколого-економічну доцільність і можливість часткової заміни різних видів цементів. Термодинамічними розрахунками спрогнозовано можливість утворення нітридів заліза при отриманні портландцементного клінкеру, які можуть бути джерелами шкідливих для життєдіяльності людей виділень аміаку з будівельних матеріалів і конструкцій, виготовлених із застосуванням портландцементу. Розроблено та оптимізовано комплексну добавку на основі сумішей електролітів, яка передбачає зниження відповідних ризиків та отримання матеріалів з підвищеними експлуатаційними властивостями і екологічністю. В результаті проведених випробувань встановлено, що цементвмісні композиції з розробленими і всебічно дослідженими модифікуючими добавками є перспективними для застосування їх в різних галузях промисловості, які були апробовані з позитивним результатом, а результати досліджень впроваджені у практику навчального процесу.
Thesis for the degree of candidate of technical sciences in specialty 05.17.11 – Technology of refractory nonmetallic materials. – National Technical University "Kharkiv Polytechnic Institute", Kharkiv, 2018. The thesis is devoted to the solution of the scientific hands-on problem related to the development of formulation technology parameters required to obtain unmolded masses of cement-containing compositions using physical and chemical peculiarities of modifying additives that contribute to the formation of a dense and firm structure of the cement stone and improve service properties. Using the sophisticated technique we synthesized polycarboxylated additives that have a reduced cost price in comparison with the known superplasticizers and defined the prospects of their use for cement-containing compositions to create the materials with improved physical-&-mechanical properties. The silica-containing waste that is formed during the production of phosphorcontaining fertilizers has been studied and the ecologic and economic appropriateness and a possibility of a partial replacement of the different types of cement have been shown. Thermodynamic computations were done to predict a possibility of the formation of iron nitrides when producing the Portland cement clinker that can be a source of ammonia harmful for the vital activities of people that is released by the construction materials and structures manufactured using Portland cement and the solution was suggested as for the development of special measures taken to reduce the ammonia emission through the introduction of additives. A complex electrolyte mixturebased additive was developed and optimized that anticipates a reduction of appropriate risks and production of the materials with improved service properties and environmental compatibility. The tests carried out showed that the cement-containing compositions with developed and comprehensively studied modifying additives are rather promising for the use by different industry branches. The tested additives gave a positive outcome and the research data were accepted for the teaching process practice.

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Richardson, I. G. "The microstructure and composition of hardened cement pastes." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302868.

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Peřina, Tomáš. "Vliv kolísání složení cementů na vznik bleedingu a zpracovatelnosti malt v čase." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392330.

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This diploma thesis is divided into two parts, the theoretical and practical part. The theoretical part is to study of factors influencing the workability and bleeding of concrete. There is mentioned the production of cement and standard requirement. The task of the practical part is to assess the cements produced by the cement works Hranice and Prachovice. These cements test in terms of water separation. In combination with these cements use superplasticizing admixtures from Mapei and Stachema and determine the impact of water separation on cement pastes. Determine rheology on the cement pastes. Define influence of variations in cement composition affect the stability of cement mixtures.

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McCulloch, Caroline E. "The immobilization of Cs in cement based matrices." Thesis, University of Aberdeen, 1985. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU363262.

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Ordinary Portland Cement (OPC) is a material of complex chemical and phase composition. Therefore its sorption characteristics were determined by examining the properties of its individual phases, as well as bulk OPC. The principal constituents of OPC along with its hydration products were tested for their potential to sorb Cs using radiocaesium tracer studies. Results showed that OPC had no significant sorption potential for Cs. It was therefore suggested that the cement composition required to be tailored by including materials which were likely to sorb Cs and moreover, improve the physical properties of the cement matrix. Two categories of materials were chosen for study:- (i) those which are normally permitted in civil engineering practice, including amorphous silica, pulverised fuel ashes (PFA) , natural pozzolari and blast furnace slag (BFS); (ii) those which were known or suspected to be good Cs sorbers but whose stability in cement were as yet unknown. These included hydrous titanium dioxide, calcined kaolin, acid zirconium phosphate, tobermorite and xonotlite. Amorphous silica, several PFA's, natural pozzolan and BFS were all examined for their sorption potential. All the materials showed, to a greater or lesser degree, a potential for immobilising Cs. The amorphous silica showed the greatest uptake of Cs and was chosen for further study. The sorption of Cs by amorphous silica was determined over a- wide range of Cs concentrations. daData were treated by the Freundlich isotherm and indicated that different sorptive mechanisms may be operating at different concentration aranges. The effect of water: solid ratio and initial pH were examined. Results showed that pH had 2 opposite effects on the silica:- (a) the high pH (-12.5) increases its sorption efficiency for Cs, compared to neutral conditions, presumably due to an enhanced negative charge on the silica surface; (b) the presence of Ca(0H)2, which was used to adjust the pH arid would be present in hydrated OPC, decreases the available silica content due to pozzolanic reactions consuming silica to form Calcium Silicate Hydrate gels (C-S-H). Hence if a silica containing material was added to cement and was the only sorbing material present, it might have to be proportioned carefully to maintain a permanent excess of silica. Leach tests were carried out on mixes of cement with amorphous silica, PFA and BFS. All gave significant improvements in leach characteristics compared to OPC alone. The effects-of curing, conditions were studied. Results showed that increasing the curing time from 28 days to 84- days or 168 days or increasing the curing temperature from 20 G to 4-0 C or both improved the leach resistance. Mercury intrusion porosimetry gave little indication that this was totally due to physical encapsulation and studies of the pore fluids on the samples showed beyond doubt that a strong chemical mechanism was involved. It was hypothesised that C-S-H with a high silica content was responsible for the chemical retention of Cs. In OPC the C-S-H has a C/S ratio of -1.7 but when amorphous silica or PFA is added this ratio is reduced and can be as low as 0.8. BFS hydrates independently from OPC but it also produces a C-S-H with a low C/S value. This hypothesis was confirmed by studies on synthetic C-S-H with a range of C/S ratios and by analysing OPC/PFA and OPC/silica pastes in the analytical electron microscope. Sorption experiments were also carried out on the second category of materials. All showed good sorption potential for Cs in neutral solutions. Sorption remained significant in the presence of Na and K as competitive species. However, the effect of Ca (OH)2, differed. Tobermorite and Xonotlite appeared to show the most significant sorption of Cs in the presence of Ca(OH,)2 while the others either reacted with Ca(OH)z or discharged Cs - presumably by exchange for Ca. Tobermorite and Xonotlite were further studied. Desorption experiments and the effect of varying the Cs concentration as well as pH effects were investigated. Both materials gave straight line plots on a Freundlich isotherm indicating that one sorptive mechanism operated over a wide concentration range. Sorption increased with pH but unfortunately desorption studies showed that the Cs was easily removed. Leach studies were carried out on composites with OPC containing 5-10% tobermorite. Such additions decreased the leach rate of Cs compared to OPC.

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James, S. D. "The relationship between the compressive strength of cement mortar and the chemical composition and fineness of cement." Master's thesis, University of Cape Town, 1993. http://hdl.handle.net/11427/8451.

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Includes bibliography.
The purpose of this research was to determine a method whereby predictions of compressive strength could be made with regard to the chemical composition and fineness of Portland cement. Tests were performed on cement paste and mortar to determine which mixture would yield the most accurate, reproducible results. Paste was found to have a high degree of variation due to its mechanism of failure. Mortar, on the other hand, yielded reproducible and accurate results. In an attempt to prevent the high variations in the compressive strength of the paste, the paste was evacuated in a special evacuation chamber. The evacuation removed a large volume of air but did not alleviate the variations in the paste strength.

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Maldonado, Fernando. "Microstructure, composition and crystallography of Aalbrog Lion Brand Danish White cement." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA341133.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, September 1997.
"September 1997." Thesis advisor(s): Alan G. Fox. Includes bibliographical references (p. 69-71). Also available online.

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Anderson, Cecilia P. "Effects of carbonation on the mineral composition of cement kiln dust /." Available online. Click here, 2006. http://sunshine.lib.mtu.edu/ETD/THESIS/andersonc/thesis.pdf.

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Книги з теми "Cement compositions"

Bye, G. C. Portland cement: Composition, production and properties. 2nd ed. London: Thomas Telford, 1999.

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Bye, G. C. Portland cement: Composition, production and properties. 2nd ed. London: Thomas Telford, 1999.

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Mechanics of fiber and textile reinforced cement composition. Boca Raton: CRC Press, 2011.

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Kirby, R. Keith. Portland cement chemical composition standards (blending, packaging, and testing). Washington, D.C: National Bureau of Standards, 1988.

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Kirby, R. Keith. Portland cement chemical composition standards: Blending, packaging, and testing : standard reference materials. Gaithersburg, MD: U.S. Dept. of Commerce, National Bureau of Standards, 1988.

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Maldonado, Fernando. Microstructure, composition and crystallography of Aalbrog Lion Brand Danish White cement. Monterey, Calif: Naval Postgraduate School, 1997.

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Curtis, Peter. The Great Man-Made River Project: Assessment of potential deleterious effects on concrete and cement-mortar linings due to composition of the water. [London]: Queen Mary College, 1987.

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Portland Cement: Composition, Production and Properties, 2nd edition. Thomas Telford Ltd, 1999. http://dx.doi.org/10.1680/pccpap.27664.

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Meade, Richard Kidder. Portland Cement: Its Composition, Raw Materials, Manufacture, Testing and Analysis. Franklin Classics Trade Press, 2018.

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Частини книг з теми "Cement compositions"

Livingston, Richard A., Walairat Bumrongjaroen, Samuel Essien, and Amde M. Amde. "Application of Individual Glass Particle Data to Estimate Uncertainties in Bulk Fly Ash Chemical Compositions." In Advances in Cement Analysis and Concrete Petrography, 41–54. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2016. http://dx.doi.org/10.1520/stp161320180006.

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Swaintek, J. N., C. J. Han, A. C. Tas, and S. B. Bhaduri. "Self-Setting Orthopedic Cement Compositions Based on CaHPO4 Additions to Calcium Sulphate." In Advances in Bioceramics and Biocomposites: Ceramic Engineering and Science Proceedings, Volume 26, Number 6, 79–86. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470291269.ch10.

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Plugin, Andrii A., Oleksii A. Pluhin, Olga S. Borziak, and Olena V. Kaliuzhna. "The Mechanism of a Penetrative Action for Portland Cement-Based Waterproofing Compositions." In Proceedings of CEE 2019, 34–41. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27011-7_5.

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Sanytsky, M., U. Marushchak, Y. Olevych, and Y. Novytskyi. "Nano-modified Ultra-rapid Hardening Portland Cement Compositions for High Strength Concretes." In Proceedings of CEE 2019, 392–99. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-27011-7_50.

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Stackelberg, D., and B. Wilge. "Evolution of the Mass Balance of Water in the Hardening Process of Cement Compositions." In Concrete Durability and Service Life Planning, 52–55. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43332-1_11.

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Plugin, Andrii A., Olga S. Borziak, Oleksii A. Pluhin, Tatiana A. Kostuk, and Dmytro A. Plugin. "Hydration Products that Provide Water-Repellency for Portland Cement-Based Waterproofing Compositions and Their Identification by Physical and Chemical Methods." In Lecture Notes in Civil Engineering, 328–35. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57340-9_40.

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Kühn, Klaus-Dieter. "PMMA Cement Composition and Chemistry." In PMMA Cements, 71–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-41536-4_6.

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Haha, Mohsen Ben, Maciej Zajac, Markus Arndt, and Jan Skocek. "Control of Cement Composition and Quality." In Intelligent and Sustainable Cement Production, 199–223. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003106791-6.

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Das, T. K., R. De La Garza, and J. C. Davila. "Influence of Cement Raw Meal Composition on Lining Life." In Ceramic Engineering and Science Proceedings, 277–83. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470320310.ch24.

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Andrade, C., P. Garcés, F. J. Baeza, Ó. Galao, and E. Zornoza. "Electronic and Electrolytic Conduction of Cement Pastes with Additions of Carbonaceous Materials." In Durability of Reinforced Concrete from Composition to Protection, 11–25. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09921-7_2.

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Тези доповідей конференцій з теми "Cement compositions"

Kopanitsa, Natalya, Yurij Sarkisov, Aleksandra Gorshkova, and Olga Demyanenko. "Additives for cement compositions based on modified peat." In ADVANCED MATERIALS IN TECHNOLOGY AND CONSTRUCTION (AMTC-2015): Proceedings of the II All-Russian Scientific Conference of Young Scientists “Advanced Materials in Technology and Construction”. AIP Publishing LLC, 2016. http://dx.doi.org/10.1063/1.4937885.

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Sedić, Krunoslav, Nediljka Gaurina-Medjimurec, and Borivoje Pašić. "Optimization of the Cement Slurry Compositions With Addition of Zeolite for Cementing Carbon Dioxide Injection Wells." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41561.

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Well integrity related to carbon dioxide injection into depleted oil and gas reservoirs can be compromised by corrosion which can affect casing, downhole and surface equipment and well cement. Impact on well cement can cause overall degradation of set cement and lead to migration of carbon dioxide back to the surface. Thus, special types of cements should be used. One of the acceptable solutions is application of cement blends based on a mixture of Portland cement and pozzolans. The present paper deals with optimization of the cement slurry design containing zeolite which is nowadays widely used due to its high pozzolan activity potential. Cement blends containing 20%, 30% and 40% zeolite clinoptilolite were used. Cement slurries were optimized for application in slim hole conditions on CO2 injection wells on Žutica and Ivanić oil fields in Croatia (Europe), where an old and deteriorated production casing was re-lined with new smaller sized one. Results obtained by this study suggest that cement slurry containing zeolite can be optimized for application in well conditions related to CO2 injection and underground storage, ranging from a slim hole to standard size casing cement jobs which leads to an improvement of well integrity related to CO2 injection.

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Merey, Sukru, Tuna Eren, and Can Polat. "Numerical Analysis of the Behavior of Gas Hydrate Layers After Cementing Operations." In SPE Europec featured at 82nd EAGE Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/205223-ms.

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Abstract Since the 2000s, the number of gas hydrate wells (i.e., exploration wells, production test wells) has increased. Moreover, in the marine environment, gas hydrate zones are drilled in conventional hydrocarbon wells. Different than conventional hydrocarbon wells, the heat released with cement hydration cannot be ignored because gas hydrates are heat sensitive. In this study, by analyzing different cement compositions (conventional cement compositions and novel low-heat of hydration cement), it is aimed to investigate the effect of the heat of cement hydration on gas hydrate zones near the wellbore. For this purpose, numerical simulations with TOUGH+HYDRATE simulator were conducted in the conditions of the Nankai Trough gas hydrates. According to the numerical simulations in this study, if the increase in temperature in the cemented layer is above 30°C, significant gas hydrate dissociation occurs, and free gas evolved in the porous media. This might cause gas channeling and poor cement bond. The heat released with cement hydration generally affects the interval between the cemented layer and 0.25 m away from the cemented layer. Within a few days after cementing, pressure, temperature, gas hydrate saturation, and gas saturation returned to almost their original values.

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Jadhav, Rahul, and Thomas Pisklak. "Liquid Strength Retrogression Control Additive." In SPE/IADC Middle East Drilling Technology Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/202104-ms.

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Abstract To mitigate strength retrogression at temperatures, higher than 230°F, well cement designs typically include strength retrogression control additives (SRCAs). Solid siliceous materials (e.g., silica flour, fume, and sized-sands) are commonly used SRCAs that are incorporated into cements using dry-blending techniques. This study highlights liquid silica compositions as alternative SRCAs to dry-blended silica for high-temperature cementing. Liquid additives can be managed easily, delivered accurately, and offer a reduced on-site footprint, thus making them particularly advantageous for operations offshore and in remote locations. This paper presents a study on the use of liquid silica compositions as SRCAs and their effect on cement slurry properties, such as thickening time, mixability, fluid loss, rheology, and free water. The cement slurry used during the current study was prepared and tested according to API RP 10B-2 (2005). The performance of the liquid silica composition was tested at temperatures up to 400°F. Set cement samples were prepared using the liquid silica composition and silica flour, cured for up to 14 days at different temperatures. In addition, permeability testing was also performed on the samples. This paper presents the findings of this research, including strength and permeability test results on cement blends cured at temperatures of 300, 330, 350, and 400°F. The liquid silica composition, which provided silica to the cement formulation equivalent to 35% BWOC dry silica (48% BWOC liquid SRCA), functioned effectively as an SRCA at temperatures up to 330°F. Signs of strength retrogression were observed at 350°F and were more pronounced at 400°F. A greater concentration of the liquid silica composition may be necessary to prevent strength retrogression at temperatures higher than 330°F. The liquid silica composition also demonstrated mild retardation and a dispersing effect on the slurry. However, it helped enable improved slurry stability and suspension, thus providing improved control over free water without adverse effects on fluid loss and sedimentation. The study results demonstrate that a liquid SRCA can help improve the performance of annular cement designs to provide dependable barriers and effective zonal isolation during high-temperature cementing applications. The improved performance enabled by this liquid silica composition verifies its potential use as an alternative SRCA for high-temperature oil well cementing operations.

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Klopotov, Vladimir D., Natalya O. Kopanitsa, Alexandra V. Kasatkina, Yuriy S. Sarkisov, Nikoliy P. Gorlenko, and Anatoly A. Klopotov. "New organo-mineral peat-based admixtures for cement compositions." In 2015 International Conference on Mechanical Engineering, Automation and Control Systems (MEACS). IEEE, 2015. http://dx.doi.org/10.1109/meacs.2015.7414956.

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Gorlenko, N. P., Iu S. Sarkisov, A. N. Pavlova, V. I. Syriamkin, and S. A. Klestov. "Understanding the wave mechanism of structure formation processes cement compositions." In Научные тенденции: Вопросы точных и технических наук. ЦНК МОАН, 2018. http://dx.doi.org/10.18411/spc-12-10-2018-03.

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Wilińska, Iwona, Barbara Pacewska, and Wojciech Kubissa. "Investigation of Portland cement composites containing high amounts of different kinds of fly ashes." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.113.

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Utilization of fluidized fly ash in cement composite is problematic, e.g. because of its changeable chemical composition and increased water demand of the mixture. However, this kind of by-product shows some self-cementing properties, which may be beneficial for low-cement mixtures. The article compares the impact of various kinds of fly ashes, i.e. fluidized fly ash and conventional one, and their mixtures on hydration of fly ash–cement compositions in relation to properties of final material. The amount of fly ash in the binder was 50 wt%. Calorimetry, thermal analysis (TG/DTG) and infrared spectroscopy were used. Compressive strength and water absorption of hardened composites were also registered. It was found that both fly ashes exhibit delay effect in fly ash-cement pastes which causes extension of initial setting time and lower heat released compared to the reference without fly ash. At later hydration days, fluidized fly ash develops higher pozzolanic activity than conventional one. Compositions with fluidized fly ash show better compressive strength compared to those containing conventional one. Mixing of different materials of high and low activity (fluidized and conventional fly ash in this case) seems to be a good way for creation of new cement replacement material.

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El Fami, Nisrine, Hind Agourrame, Nacer Khachani, Ali Boukhari, and Adeljebbar Diouri. "Influence of the Variability of Limestone and Fly Ash on the Setting and Mechanical Properties of a Moroccan Composite Cement." In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.549.

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The Moroccan cement industry is looking for new processes to effectively minimize the high energy costs associated to cement manufacturing. This work presents the effect of three types of limestone with different chemical compositions and different CaCO3 contents on the physical and mechanical properties of resulting composite cements by the addition of fly ash in the proportions by weight of: 5 % and 10 %. The samples are studied in order to evaluate the interaction between different types of limestone and fly ash. Ternary cements based on fly ash-limestone-clinker induce a significant prolongation of the setting time compared to binary cements based on limestone-clinker. The substitution of clinker by limestone induces an improvement in mechanical strength compared to ternary cements in the first days; at 28 days, cements prepared with fly ashes reach significant strength due to their pozzolanic reaction.

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Wilkinson, Angus P., Andrew C. Jupe, Kimberly E. Kurtis, Nikhila N. Naik, Stuart R. Stock, and Peter L. Lee. "Spatially Resolved Energy Dispersive X-Ray Diffraction (EDXRD) as a Tool for Nondestructively Providing Phase Composition Depth Profiles on Cement and Other Materials." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-62449.

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The presence of sulfates in water or soils surrounding portland cement concrete structures leads to progressive degradation. Spatially resolved energy dispersive diffraction (EDXRD) in combination with computed microtomography (μCT) and mechanical measurements can provide the information needed to understand, in detail, the degradation mechanisms that are associated with sulfate attack and to validate accelerated test methods used to evaluate the sulfate resistance of cements. Highly penetrating, high-energy X-rays from synchrotron sources allow the use of EDXRD to nondestructively determine depth profiles for the crystalline phases in the cement paste specimens several millimeters below the sample surface. These depth profiles, and how they vary with sulfate exposure conditions and duration, can be correlated with mechanical changes and the crack patterns seen in the microtomographs. Spatially resolved EDXRD is in principle useful for phase composition mapping and depth profiling in a wide range of materials where the attenuation of high energy x-rays is not extreme. Suitable materials include many ceramic compositions.

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Ravi, Kris, David E. McMechan, B. R. Reddy, and Ron Crook. "A Comparative Study of Mechanical Properties of Density-Reduced Cement Compositions." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2004. http://dx.doi.org/10.2118/90068-ms.

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Звіти організацій з теми "Cement compositions"

Levinson, Ronnen, and Hashem Akbari. Effects of composition and exposure on the solar reflectance of Portland cement concrete. Office of Scientific and Technical Information (OSTI), December 2001. http://dx.doi.org/10.2172/820773.

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Baral, Aniruddha, Jeffery Roesler, and Junryu Fu. Early-age Properties of High-volume Fly Ash Concrete Mixes for Pavement: Volume 2. Illinois Center for Transportation, September 2021. http://dx.doi.org/10.36501/0197-9191/21-031.

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High-volume fly ash concrete (HVFAC) is more cost-efficient, sustainable, and durable than conventional concrete. This report presents a state-of-the-art review of HVFAC properties and different fly ash characterization methods. The main challenges identified for HVFAC for pavements are its early-age properties such as air entrainment, setting time, and strength gain, which are the focus of this research. Five fly ash sources in Illinois have been repeatedly characterized through x-ray diffraction, x-ray fluorescence, and laser diffraction over time. The fly ash oxide compositions from the same source but different quarterly samples were overall consistent with most variations observed in SO3 and MgO content. The minerals present in various fly ash sources were similar over multiple quarters, with the mineral content varying. The types of carbon present in the fly ash were also characterized through x-ray photoelectron spectroscopy, loss on ignition, and foam index tests. A new computer vision–based digital foam index test was developed to automatically capture and quantify a video of the foam layer for better operator and laboratory reliability. The heat of hydration and setting times of HVFAC mixes for different cement and fly ash sources as well as chemical admixtures were investigated using an isothermal calorimeter. Class C HVFAC mixes had a higher sulfate imbalance than Class F mixes. The addition of chemical admixtures (both PCE- and lignosulfonate-based) delayed the hydration, with the delay higher for the PCE-based admixture. Both micro- and nano-limestone replacement were successful in accelerating the setting times, with nano-limestone being more effective than micro-limestone. A field test section constructed of HVFAC showed the feasibility and importance of using the noncontact ultrasound device to measure the final setting time as well as determine the saw-cutting time. Moreover, field implementation of the maturity method based on wireless thermal sensors demonstrated its viability for early opening strength, and only a few sensors with pavement depth are needed to estimate the field maturity.

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Weiss, W. Jason, Chunyu Qiao, Burkan Isgor, and Jan Olek. Implementing Rapid Durability Measure for Concrete Using Resistivity and Formation Factor. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317120.

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The durability of in-place concrete is a high priority issue for concrete pavements and bridges. Several studies have been conducted by INDOT to use electrical resistivity as a measure of fluid transport properties. Resistivity is dependent on the chemistry of the cement and supplementary cementitious system used, as such it has been recommended that rather than specifying resistivity it may be more general to specify the formation factor. Samples were tested to establish the current levels of performance for concrete pavements in the state of Indiana. Temperature and moisture corrections are presented and acceptable accelerated aging procedure is presented. A standardized testing procedure was developed (AASHTO TP 119–Option A) resulting in part from this study that provides specific sample conditioning approaches to address pore solution composition, moisture conditioning, and testing procedures. An accelerated aging procedure is discussed to obtain later age properties (91 days) after only 28 days.

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