Author: QINGLI.. CHU
Publisher:
ISBN:
Category :
Languages : fr
Pages : 128

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Book Description
LES FUMEES DE SILICE (FS) SONT DES SOUS-PRODUITS FORMES LORS DE LA FABRICATION DU SILICIUM ET DE SILICO-ALLIAGES. LEURS CARACTERES PARTICULAIRES ET CRISTALLOCHIMIQUES EN FONT UN BON ADDITIF POUR LES BETONS EN AMELIORANT LES PROPRIETES RHEOLOGIQUES ET MECANIQUES DE CES DERNIERS. CEPENDANT, CES AMELIORATIONS NE SONT OBTENUES QUE SI LA DESAGGLOMERATION ET LA DISPERSION DES FS EST COMPLETE. L'OBJECTIF DE CE TRAVAIL VISE A UNE MEILLEURE COMPREHENSION DES PHENOMENES ET PARAMETRES CONDUISANT A UNE AMELIORATION DE L'ETAT DE DISPERSION DES FS AFIN D'AMELIORER ENCORE LA MICROSTRUCTURE ET LES PROPRIETES DES BETON. DANS CE BUT, EN FONCTION DE LA COMPOSITION INITIALE DES FS, LEURS CARACTERISTIQUES PHYSICO-CHIMIQUES A L'ETAT DE POUDRE ET LEURS PROPRIETES COLLOIDALES EN MILIEU AQUEUX ONT ETE ETUDIEES ET RELIEES A LEURS PROPRIETES STRUCTURALES ET RHEOLOGIQUES. A L'ETAT DE POUDRE, LES FS CONTIENNENT EN MAJORITE DE LA SILICE SOUS FORME QUASI-AMORPHE DE CRISTOBALITE MAL-CRISTALLISEE (PSEUDO-CRISTALLITES D'UNE DIZAINE D'ANGSTROM), AINSI QU'UNE FAIBLE QUANTITE DE QUARTZ, DE CRISTOBALITE II CRISTALLISEE ET DE CARBURE DE SILICIUM. L'OBSERVATION PAR MEB A MONTRE QUE LE TRAITEMENT DE DENSIFICATION INFLUENCE FORTEMENT LA MORPHOLOGIE DES GRAINS. L'ANALYSE DES IMAGES DE MET NOUS A PERMIS D'OBTENIR LA DISTRIBUTION DE TAILLE DES PARTICULES ELEMENTAIRES POUR LES FS ETUDIEES, DONT LES DIAMETRES VARIENT DE 0,007 A 0,54 M. EN MILIEU AQUEUX, LE TRAITEMENT DE DENSIFICATION MODIFIE LA DISPERSABILITE DES FS. LES FS DENSIFIEES SONT PLUS DIFFICILES A DISPERSER QUE LES FS NON-DENSIFIEES. POUR LES SUSPENSIONS DE FS, LES MESURES DE LA VITESSE ET DU VOLUME DE SEDIMENTATION, LES MESURES DE LA CHARGE DE SURFACE DES PARTICULES AINSI QUE L'ANALYSE GRANULOMETRIQUE ONT MONTRE QUE LA DISPERSABILITE ET LA PRESENCE DE CATIONS, COMME CA#+#2, JOUENT UN ROLE TRES IMPORTANT DANS L'AGGLOMERATION DES FS. IL N'EST DONC PAS JUDICIEUX DE FORMER DES COULIS AVEC DES FS RICHES EN CALCIUM QUI ENGENDRENT LA FORMATION D'AGGLOMERATS MECANIQUEMENT STABLES. LE MECANISME D'AGGLOMERATION EST LIE A L'EVOLUTION DE LA CHARGE DE SURFACE DES PARTICULES. IL A ETE ETUDIE QUANTITATIVEMENT PAR LA METHODE D'ELECTROPHORESE ET DE TITRAGE D'ELECTROLYTE. L'ETUDE RHEOLOGIQUE DES SUSPENSIONS DE FS (VISCOSITE, SEUIL D'ECOULEMENT ET THIXOTROPIE) A MONTRE L'IMPORTANCE DE LA DISPERSABILITE DES FS ET DE LEUR TENEUR EN IMPURETES. L'INTERVENTION CHIMIQUE DES IMPURETES EST RESPONSABLE DES AUGMENTATIONS DE VISCOSITE ET DE PH AU COURS DU TEMPS, AINSI QUE DE L'EVOLUTION DE L'AGGLOMERATION ET DE LA CHARGE DE SURFACE. UNE RELATION QUANTITATIVE ENTRE LA VISCOSITE APPARENTE ET LA FRACTION EN SOLIDE A PU ETRE DEMONTREE EN UTILISANT L'EQUATION DE KRIEGER-DOUPHERTY ET EN INTRODUISANT UN COEFFICIENT QUI TRADUIT L'INFLUENCE DE L'AGGLOMERATION SUR LA VISCOSITE

Author: Don Montague
Publisher: Taylor & Francis
ISBN: 9780419199106
Category : Architecture
Languages : en
Pages : 472

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Book Description
This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Author: Stuart Hill
Publisher: Birkhäuser
ISBN: 3034863101
Category : Science
Languages : en
Pages : 364

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Book Description

Author: P.F.G. Banfill
Publisher: CRC Press
ISBN: 9780419153603
Category : Architecture
Languages : en
Pages : 388

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Book Description
This book brings together new research information on the flow behaviour of cementitious materials from the UK, France, Italy, Germany, Poland, Finland, USSR, USA and Japan, presented at the International Conference organised by the British Society of Rheology in March 1990.

Author: Wade H. Shafer
Publisher: Springer
ISBN: 9780306341205
Category : Science
Languages : en
Pages : 320

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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.

Author: Konstantinos N. Papadopoulos
Publisher: Nova Publishers
ISBN: 9781604562620
Category : Science
Languages : en
Pages : 320

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Book Description
Food chemistry is the study of chemical processes and interactions of all biological and non-biological components of foods. The biological substances include such items as meat, poultry, lettuce, beer, and milk as examples. It is similar to biochemistry in its main components such as carbohydrates, lipids, and protein, but it also includes areas such as water, vitamins, minerals, enzymes, food additives, flavours, and colours. This discipline also encompasses how products change under certain food processing techniques and ways either to enhance or to prevent them from happening. An example of enhancing a process would be to encourage fermentation of dairy products with lactic acid; an example of a preventing process would be stopping the Maillard reaction on the surface of freshly cut Red Delicious apples whether by hand or mechanical methods. This book presents the recent research from around the world in this field.

Author: John Henry Lorentz
Publisher: Historical Dictionaries of Asia, Oceania, and the Middle East
ISBN:
Category : History
Languages : en
Pages : 570

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Book Description
Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.

Author: Andrew Chadwick
Publisher: CRC Press
ISBN: 1000395642
Category : Technology & Engineering
Languages : en
Pages : 682

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Book Description
This classic text, now in its sixth edition, combines a thorough coverage of the basic principles of civil engineering hydraulics with a wide-ranging treatment of practical, real-world applications. It now includes a powerful online resource with worked solutions for chapter problems and solution spreadsheets for more complex problems that may be used as templates for similar issues. Hydraulics in Civil and Environmental Engineering is structured into two parts to deal with principles and more advanced topics. The first part focuses on fundamentals, such as hydrostatics, hydrodynamics, pipe and open channel flow, wave theory, physical modelling, hydrology and sediment transport. The second part illustrates engineering applications of these principles to pipeline system design, hydraulic structures, river and coastal engineering, including up-to-date environmental implications, as well as a chapter on computational modelling, illustrating the application of computational simulation techniques to modern design, in a variety of contexts. New material and additional problems for solution have been added to the chapters on hydrostatics, pipe flow and dimensional analysis. The hydrology chapter has been revised to reflect updated UK flood estimation methods, data and software. The recommendations regarding the assessment of uncertainty, climate change predictions, impacts and adaptation measures have been updated, as has the guidance on the application of computational simulation techniques to river flood modelling. Andrew Chadwick is an honorary professor of coastal engineering and the former associate director of the Marine Institute at the University of Plymouth, UK. John Morfett was the head of hydraulics research and taught at the University of Brighton, UK. Martin Borthwick is a consultant hydrologist, formerly a flood hydrology advisor at the UK’s Environment Agency, and previously an associate professor at the University of Plymouth, UK.

Author: Canada. Patent Office
Publisher:
ISBN:
Category : Copyright
Languages : en
Pages : 1070

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Book Description