White Portland Cement
Mostrando 13-24 de 28 artigos, teses e dissertações.
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13. Evaluation of physico-chemical properties of Portland cements and MTA
The purpose of this study was to evaluate the hydrogenionic potential and electrical conductivity of Portland cements and MTA, as well as the amount of arsenic and calcium released from these materials. In Teflon molds, samples of each material were agitated and added to plastic flasks containing distilled water for 3, 24, 72 and 168 h. The results were anal
Brazilian Oral Research. Publicado em: 2010-09
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14. Avaliação macroscópica e microscópica do cimento Portland comum - CP I e do cimento Portland branco não estrutural - CPB incluídos na calvária de ratos / Macroscopic and microscopic evaluation of Portland Cement Joint - CP I and the Portland Cement White not structural - CPB included in the skull of rats
The biomaterials can be defined as substances of natural or synthetic origin that are tolerated on a temporary or permanent by the various tissues that make up the organs of living beings. Among these biomaterials can quote the mineral trioxide aggregate (MTA), which was developed at the University of Loma Linda, in the 90s. Since then, it stopped work on re
Publicado em: 2009
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15. Estudo sobre a influência da adição de pigmentos em propriedades de durabilidade e na cromacidade do concreto de cimento Portland branco / A study about the influence of the pigments addition in the durability properties and chromaticity of white Portland cement concrete
Sob o ponto de vista de durabilidade, os concretos cromáticos merecem atenção especial, não apenas pelas suas propriedades físicas e químicas, mas principalmente pela sua utilização como elemento arquitetônico, o qual permite a confecção de elementos estruturais aparentes, deixando-os assim mais suscetíveis à ação destrutiva das intempéries.
Publicado em: 2009
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16. Avaliação de algumas propriedades físico-químicas de alguns materiais retrobturadores / Evaluation of some physicochemical properties of retrograde filling
Some properties had been evaluated physicochemical, such as pH, release of calcium ions, setting time, solubility and radiopacity of 3 retrograde filling the base of the aggregate of mineral trioxide, to clínquer of the Portland cement and an experimental epoxy sealer. Experimental cements MTA white Angelus, MTA Bio, light-curing MTA and Sealepox RP and the
Publicado em: 2009
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17. Total shrinkage and chloride penetration in concretes with white Portland cement and blast furnace slag / Retração total e penetração de cloretos em concretos com cimento Portland branco e escória de alto forno
A retração hidráulica é um fenômeno que ocorre no concreto, submetido ou não a carregamento, devido à perda de umidade, uma vez exposto ao meio ambiente e permitida sua secagem. Ela é responsável por praticamente toda a deformação total por retração no concreto. Um elemento de concreto com restrição de deformação por retração pode desenvol
Publicado em: 2009
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18. CARBONATION AND CAPILLARY ABSORPTION IN CONCRETES OF WHITE PORTLAND CEMENT WITH HIGH CONTENTS OF BLAST FURNACE SLAG AND CHEMICAL ACTIVATORS / CARBONATAÇÃO E ABSORÇÃO CAPILAR EM CONCRETOS DE CIMENTO PORTLAND BRANCO COM ALTOS TEORES DE ADIÇÃO DE ESCÓRIA DE ALTO FORNO E ATIVADOR QUÍMICO
The carbonation phenomenon, reaction between CO2 from the atmosphere in the presence of humidity with the Portland cement hydration products, induces pH reduction to levels that can cause the elimination of steels protective layer, enabling the corrosion mechanism of the steel structure to start.. This is one of the main pathologies in the reinforced concret
Publicado em: 2008
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19. RESISTIVIDADE ELÉTRICA DE CONCRETOS DE CIMENTO PORTLAND BRANCO E ELEVADOS TEORES DE ESCÓRIA DE ALTO FORNO / ELECTRICAL RESISTIVITY OF WHITE PORTLAND CEMENT CONCRETES AND HIGH BLAST FURNACE SLAG CONTENT
The electrical resistivity is an important concrete property that allows evaluating the access facility of aggressive agents before the corrosion process begins and estimates the velocity of the same process after it begun. The electrical resistivity and the oxygen availability are the characteristics that control the corrosion velocity. This work aimed to e
Publicado em: 2008
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20. Penetração de cloretos em concretos compostos com cimento Portland branco e escória de alto forno, ativados quimicamente / Chloride ion penetration in concretes with white Portland cement and blast furnace slag, chemically activated
The consumption of white Portland cement (WPC), in structural concretes, has been growing lately. Thus, targeting diffuse its use, and confirm its quality and durability as structural cement, this work has the aimed to investigate the effect of concretes compounds with WPC, slag and chemical activator (Na2SO4), on its behavior against chloride ion penetratio
Publicado em: 2008
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21. In vitro sealing ability of white and gray mineral trioxide aggregate (MTA) and white Portland cement used as apical plugs
This study evaluated the sealing ability of apical plugs made of white and gray MTA-Angelus® and white Portland cement placed via the root canal and having different thicknesses (2, 5 and 7 mm). Ninety extracted human single-rooted teeth were instrumented using a size 40 K-file to standardize the foraminal opening by the stepback technique. The teeth were a
Journal of Applied Oral Science. Publicado em: 2007-06
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22. Avaliação microscópica da implantação, em subcutâneo de ratos, do agregado trióxido mineral - CPM e do clínquer do cimento Portland branco puro e acrescido de 2 e 5% de sulfato de cálcio e determinação de seus tempos de presa / Microscopic evaluation of the response of subcutaneous tissues of rats to implantation of Portland cement modified CPM and clinker of white Portland cement pure or combined with 2 % and 5 % of calcium sulfate and to determine the setting time of this materials
The Mineral Trioxide Aggregate (MTA) has been showing good physicochemical and biological properties and indicated for use in endodontic apical surgery, perforation repair, and apexification treatment. The purpose of this study was to evaluate the subcutaneous connective tissue reactions of CPM and clinker of Portland cement, either pure or combined with cal
Publicado em: 2007
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23. Ladrilhos e revestimentos hidráulicos de alto desempenho / High performance hydraulic tiles and coverings
The hydraulic tiles are coverings produced by using hydraulic binders, whose production technology has not follow the great technological evolution of the concretes, the availabilities of new materials and the usual techniques in recent years, thus they have lost space and competition in the market due to their handicraft characteristic of production. This w
Publicado em: 2007
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24. AvaliaÃÃo da biocompatibilidade do cimento portland, em polpas humanas, apÃs capeamento pulpar direto: estudo morfolÃgico e imunoistoquÃmico. / Evaluation of the biocompatibility of the Portland cement, in human pulp, after direct dental pulp capping: a morphological and imunohistological study
The present study evaluated dental implants with no primary stability and with uncovered threads, inserted in rabbit’s tibias, in the presence of BMP through the value of removal torque and radiographic’s analysis. It was used 6 adult male New Zealand White rabbits, divided in test (4 animals) and control group (2 animals). Two implants (Neodent�
Publicado em: 2006