INFLUENCE DU CHLORE SUR LE COMPORTEMENT A L'EQUILIBRE ET SUR LES PROPRIETES DE TRANSFERT DE MATERIAUX DU GENIE CIVIL PDF Download
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Book Description
CE TRAVAIL S'INSCRIT DANS LE CADRE D'UNE ACTION DE RECHERCHE CONCERTEE SUR LA DURABILITE DES BETONS. LA CORROSION DES ARMATURES DU BETON EST DUE A LA PENETRATION D'AGENTS AGRESSIFS EXTERIEURS TEL QUE LE CHLORE. LE BUT DE CETTE ACTION DE RECHERCHE EST DE METTRE EN PLACE UN MODELE TRAITANT DU TRANSFERT HUMIDITE-IONS CHLORURES DANS LES MILIEUX POREUX DU GENIE CIVIL AFIN DE PREVOIR LA DUREE DE VIE DES OUVRAGES EN FONCTION DE L'EPAISSEUR D'ENROBAGE. UN MODELE MACROSCOPIQUE A ETE ETABLI EN INTRODUISANT DES COEFFICIENTS DE TRANSFERT QUI DEPENDENT DE PLUSIEURS PARAMETRES TELS QUE LA TENEUR EN EAU ET LA TENEUR EN CHLORE. CERTAINS DE CES COEFFICIENTS AINSI QUE L'INFLUENCE DES PARAMETRES CITES PRECEDEMMENT VONT ETRE DETERMINES EXPERIMENTALEMENT SUR DES MORTIERS. NOUS AVONS TOUT D'ABORD EXPLORER L'INFLUENCE DE LA CONCENTRATION EN CHLORURE DE SODIUM (NACL) SUR LES PROPRIETES A L'EQUILIBRE. LES ISOTHERMES DE SORPTION AVEC DES MATERIAUX CONTENANT INITIALEMENT DU NACL SONT DECALEES PAR RAPPORT A L'ISOTHERME CLASSIQUE REPRESENTE PAR UN MODELE DE TYPE GAB. CE DECALAGE A ETE PARAMETRE EN FONCTION DE LA CONCENTRATION EN NACL. NOUS PRESENTONS ENSUITE L'ENSEMBLE DES RESULTATS DES DIFFUSIVITES HYDRIQUES RELATIVES AUX MATERIAUX ETUDIES EN FONCTION DE LA TENEUR EN SOLUTION ET DE LA CONCENTRATION EN NACL. NOUS AVONS EFFECTUE UN SEUL CYCLE IMBIBITION-SECHAGE. POUR LES DEUX TYPES DE TRANSFERT LA CONCENTRATION EN NACL N'A PAS D'INCIDENCE SUR LA DIFFUSIVITE HYDRIQUE. CETTE CONCLUSION DEVRA ETRE VERIFIEE POUR PLUSIEURS CYCLES AVANT DE L'UTILISER POUR ECRIRE NOTRE CODE DE CALCUL. DES PROFILS EN CHLORE ONT AUSSI ETE DETERMINES EN FIN D'IMBIBITION ET EN FIN DE SECHAGE. IL Y A ACCUMULATION DE CHLORURES FIXES PRES DE LA SURFACE DES MATERIAUX. LA CINETIQUE DE FIXATION DES IONS CHLORURES LORS D'IMBIBITIONS EST PLUS LENTE QUE LORS DE LA DETERMINATION DES ISOTHERMES D'INTERACTION. LE MOUVEMENT DE L'EAU EST PLUS RAPIDE ET EMPECHE LES IONS CHLORURES DE SE FIXER. DE PLUS ON REMARQUE QU'IL N'Y A PAS DE REDISTRIBUTION SIGNIFICATIVE DE CHLORE ENTRE LA FIN DE L'IMBIBITION ET LA FIN DU SECHAGE. LES MOUVEMENTS D'EAU LIQUIDE CONTINU SONT DONC PEU IMPORTANTS EN SECHAGE.
Book Description
CE TRAVAIL S'INSCRIT DANS LE CADRE D'UNE ACTION DE RECHERCHE CONCERTEE SUR LA DURABILITE DES BETONS. LA CORROSION DES ARMATURES DU BETON EST DUE A LA PENETRATION D'AGENTS AGRESSIFS EXTERIEURS TEL QUE LE CHLORE. LE BUT DE CETTE ACTION DE RECHERCHE EST DE METTRE EN PLACE UN MODELE TRAITANT DU TRANSFERT HUMIDITE-IONS CHLORURES DANS LES MILIEUX POREUX DU GENIE CIVIL AFIN DE PREVOIR LA DUREE DE VIE DES OUVRAGES EN FONCTION DE L'EPAISSEUR D'ENROBAGE. UN MODELE MACROSCOPIQUE A ETE ETABLI EN INTRODUISANT DES COEFFICIENTS DE TRANSFERT QUI DEPENDENT DE PLUSIEURS PARAMETRES TELS QUE LA TENEUR EN EAU ET LA TENEUR EN CHLORE. CERTAINS DE CES COEFFICIENTS AINSI QUE L'INFLUENCE DES PARAMETRES CITES PRECEDEMMENT VONT ETRE DETERMINES EXPERIMENTALEMENT SUR DES MORTIERS. NOUS AVONS TOUT D'ABORD EXPLORER L'INFLUENCE DE LA CONCENTRATION EN CHLORURE DE SODIUM (NACL) SUR LES PROPRIETES A L'EQUILIBRE. LES ISOTHERMES DE SORPTION AVEC DES MATERIAUX CONTENANT INITIALEMENT DU NACL SONT DECALEES PAR RAPPORT A L'ISOTHERME CLASSIQUE REPRESENTE PAR UN MODELE DE TYPE GAB. CE DECALAGE A ETE PARAMETRE EN FONCTION DE LA CONCENTRATION EN NACL. NOUS PRESENTONS ENSUITE L'ENSEMBLE DES RESULTATS DES DIFFUSIVITES HYDRIQUES RELATIVES AUX MATERIAUX ETUDIES EN FONCTION DE LA TENEUR EN SOLUTION ET DE LA CONCENTRATION EN NACL. NOUS AVONS EFFECTUE UN SEUL CYCLE IMBIBITION-SECHAGE. POUR LES DEUX TYPES DE TRANSFERT LA CONCENTRATION EN NACL N'A PAS D'INCIDENCE SUR LA DIFFUSIVITE HYDRIQUE. CETTE CONCLUSION DEVRA ETRE VERIFIEE POUR PLUSIEURS CYCLES AVANT DE L'UTILISER POUR ECRIRE NOTRE CODE DE CALCUL. DES PROFILS EN CHLORE ONT AUSSI ETE DETERMINES EN FIN D'IMBIBITION ET EN FIN DE SECHAGE. IL Y A ACCUMULATION DE CHLORURES FIXES PRES DE LA SURFACE DES MATERIAUX. LA CINETIQUE DE FIXATION DES IONS CHLORURES LORS D'IMBIBITIONS EST PLUS LENTE QUE LORS DE LA DETERMINATION DES ISOTHERMES D'INTERACTION. LE MOUVEMENT DE L'EAU EST PLUS RAPIDE ET EMPECHE LES IONS CHLORURES DE SE FIXER. DE PLUS ON REMARQUE QU'IL N'Y A PAS DE REDISTRIBUTION SIGNIFICATIVE DE CHLORE ENTRE LA FIN DE L'IMBIBITION ET LA FIN DU SECHAGE. LES MOUVEMENTS D'EAU LIQUIDE CONTINU SONT DONC PEU IMPORTANTS EN SECHAGE.
Author: Don Montague Publisher: Taylor & Francis ISBN: 9780419199106 Category : Architecture Languages : en Pages : 472
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: Linda Strande Publisher: IWA Publishing ISBN: 1780404735 Category : Technology & Engineering Languages : en Pages : 428
Book Description
It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.
Author: Bruno Voituriez Publisher: UNESCO ISBN: Category : Science Languages : en Pages : 132
Book Description
El Nino, caprice of the heavens, scapegoat for every calamity? The general public cannot really understand what is behind the El Nino phenomenon. The book offers a tour of the Earth's climate to understand one of its normal but extreme components.
Author: Olivier Coussy Publisher: Wiley ISBN: 9780471952671 Category : Technology & Engineering Languages : en Pages : 472
Book Description
This book provides a unified and systematic continuum approach for engineers and applied physicists working on the modelling of porous media. Self-contained, it sets out—from a macroscopic point of view—the main concepts and results of deformable porous media subject to the flow of one or several fluids. The theory presented includes developments in the areas of thermodynamics, poroelastoplasticity, poroviscoplasticity, wave propagation and surfaces of discontinuity, boundary value problems and numerical methods, as well as chemico-mechanical couplings. It can be used for numerous diversified applications in geophysics, civil engineering, biomechanics, material science, etc.
Author: R. N. Bray Publisher: CRC Press ISBN: 0203894898 Category : Technology & Engineering Languages : en Pages : 398
Book Description
Expanding a port, deepening a navigation channel or creating new land for development, introduces changes to our physical, social, economic and political environment. Changes may result from events during the construction process, or relate to the nature of the completed structure. Changes can be positive or negative, short-term or long-term, and may affect the immediate vicinity of the project or a larger geographical area. Predicting and assessing all possible effects of a planned dredging activity in a scientifically-sound and reliable manner is essential, so that appropriate control measures can be taken to avoid or mitigate unwelcome impacts. This book provides guidance for a complete holistic environmental evaluation procedure and for the design and implementation of environmental control measures. The book is of particular interest to engineers, government agencies and port authorities, as well as civil engineering consultants and contractors involved in planning and designing dredging, maritime infrastructure and fluvial projects.
Author: International Union for Conservation of Nature and Natural Resources. Commission on Environmental Law Publisher: IUCN ISBN: 9782831705248 Category : Business & Economics Languages : en Pages : 226
Book Description
This is an updated edition of the 1995 version. In the mid-1980's, the IUCN CEL, in consultation with leading experts from around the world, began to respond to a need later identified by Agenda 21: the preparation of an integrated framework for international environmental law.
Author: David M. Robbins Publisher: IWA Publishing ISBN: 178040476X Category : Science Languages : en Pages : 148
Book Description
This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.
Author: Stéphanie Bonnet
Author: Stéphanie Bonnet
Author: Don Montague
Author: Linda Strande
Author: Bruno Voituriez
Author: Olivier Coussy
Author: R. N. Bray
Author: Eric Servat
Author: International Union for Conservation of Nature and Natural Resources. Commission on Environmental Law
Author: David M. Robbins
Author: Elizabeth Tilley