Download or read book Estudio de la influencia de la adici n de aditivos en pastas de cemento y morteros written by Xavier Andreo González and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Los aditivos para el hormigón estructural y el resto de los materiales de base cemento son sustancias imprescindibles para obtener del hormigón sus características más avanzadas, hasta el punto que se consideran un componente más del hormigón y su uso está generalizado, tanto en la industria del prefabricado como en la del hormigón preparado. El desarrollo de los aditivos químicos ha sido muy rápido y actualmente se consideran esenciales para obtener hormigones con funciones específicas.El objetivo de este trabajo es iniciar una base de datos donde se incluya el resultado de la medición de cada una de las variables, teniendo en cuenta las diferentes configuraciones utilizadas. Con esto se pretende solucionar el problema de la escasez de datos en los diferentes ensayos en un futuro,visto que se dispone de un máximo de 3 resultados por ensayo debido al elevado coste del material y al tiempo de realización del ensayo, que suele llegar a los 28 días. La metodología de trabajo seguida se basa en el estudio de las propiedades de las pastas de cemento y morteros, utilizando los datos obtenidos para incorporarlos al análisis de los resultados del objetivo principal, bajo la premisa que ello permitirá conseguir un estudio más robusto y fiable al incorporar propiedades macro a nuestro estudio micro. Estas propiedades han sido medidas tanto en estado fresco (densidad, contenido del aire y resistencia), como en estado endurecido (absorción tras inmersión, densidad real en seco, densidad real tras inmersión, densidad aparente, volumen de huecos permeables, resistencia a flexo-tracción, resistencia a compresión simple, y microdureza). Dichas propiedades se han estudiado para observar cómo afecta la adición de aditivos en pastas de cemento y morteros, y se han analizado los resultados utilizando un análisis estadístico.

Download or read book Estudio del efecto de aditivos y acidiones en las propiedades f sicas y mec nicas de los morteros written by Ana Jaime Giménez and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: El objetivo de este Proyecto Final de Grado es someter a estudio diferentes formulaciones de mortero, con la finalidad de observar como afecta el uso de adiciones y aditivos, a las propiedades físicas y mecánicas del cemento portland. Para poder llevar a cabo este análisis, se han realizado probetas de mortero utilizando dos tipos de cemento diferentes, un cemento portland sin adición y un cemento portland con un contenido de ceniza volante silícea, comprendido entre el 6% y el 20%. Para la parte estadística, se ha optado por la elaboración de un diseño de experimentos basado en la metodología de superficies de respuesta. Las técnicas de diseño de experimentos se basan en estudiar simultáneamente los efectos de todos los factores de interés. Esta metodología, frente a la forma tradicional de experimentación, que se basa en variar los niveles de un factor manteniendo fijos los restantes, presenta numerosas ventajas, ya que permite reducir considerablemente el número de pruebas a realizar y proporciona mejores resultados con un menor coste. Por lo tanto, se han desarrollado dos diseños de experimentos idénticos, uno para cada tipo de cemento. A través del diseño, se ha determinado el número de formulaciones y de réplicas de las mismas con las que posteriormente se experimentará. Los factores de influencia que varían son el agua y el aditivo y los que se mantienen fijos son el árido y el cemento. Por cada combinación indicada en el diseño, se han elaborado seis probetas, dos para ser ensayadas mecánicamente a los 7 días de edad, otras dos, a los 28 días de edad y las dos restantes, a los 90 días de edad. También se han llevado a cabo ensayos de consistencia y de densidad en fresco de cada una de las pastas de mortero amasadas. Para la caracterización mecánica, las probetas se han sometido a flexotracción simple con carga puntual centrada y, posteriormente, las mitades obtenidas a compresión. Finalmente se han introducido los resultados en el diseño y se han obtenido modelos que representan de forma gráfica y analítica el comportamiento mecánico de los cementos estudiados. Esto modelos permiten conocer la resistencia a compresión para cualquier combinación dentro del rango estudiado.

Download or read book Utilizaci n de lodos secos de depuradora de aguas residuales como adici n en pastas de cemento y morteros de cemento p rtland written by Alejandro Ortiz Garre and published by . This book was released on 2005 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Superplasticizers written by Vangipuram Seshachar Ramachandran and published by Natural Resources Canada, Canada Centre for Mineral and Energy Technology. This book was released on 1997 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has been prepared with the aim of integrating information about the chemistry and application of concrete superplasticizers in a manner relevant to concrete engineers and technologists. The opening chapter introduces basic aspects of concrete science as background for what follows. Chapters 2-4 discuss the chemical synthesis of superplasticizers, methods used to characterize those chemicals, and techniques for evaluation of their effect in cementitious systems. Subsequent chapters cover: the influence of superplasticizers on hydration of cement materials; rheology of cementitious systems; issues related to the mode of action and compatibility of superplasticizers; the effect of superplasticizers on fresh concrete; mechanical properties and durability of concrete; innovative applications of superplasticizers in concrete; superplasticizer dispensing, specifications, and standards; patents related to superplasticizers; and current and future trends in the use of superplasticizers in concrete.

Download or read book Design of Composite Structures Against Fatigue written by Rayner M. Mayer and published by . This book was released on 1996 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Natural Energy and Vernacular Architecture written by Hassan Fathy and published by University of Chicago Press. This book was released on 1986 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The culmination of a lifetime's design practice and environmental study, Natural Energy and Vernacular Architecture presents a master architects' extraordinary insights into the vernacular wisdom of indigenous architectural forms that have evolved in hot arid climates.

Download or read book Proceedings of the International Conference of Sustainable Production and Use of Cement and Concrete written by Jose Fernando Martirena-Hernandez and published by Springer. This book was released on 2019-06-21 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume gathers the latest advances, innovations and applications presented by leading international researchers and engineers at the International Conference on Sustainable Production and Use of Cement and Concrete (ICSPCC 2019), held in Villa Clara, Cuba on June 23-30, 2019. It covers highly diverse topics, including sustainable production of low-carbon cements, novelties in the development of supplementary cementitious materials, new techniques for the microstructural characterization of construction materials, Portland-based and alkaline-activated cementitious systems, development of additives and additions in the sustainable production of concrete, sustainable production of high-performance concrete, durable concrete produced with recycled aggregates, development of mortars for historical patrimony restoration, environmental and economic assessment of the production and use of cement. The contributions, which were selected by means of a rigorous, international peer-review process, highlight numerous exciting ideas that will inspire novel research directions and foster multidisciplinary collaboration between different specialists.

Download or read book Cement and Concrete Chemistry written by Wieslaw Kurdowski and published by Springer Science & Business. This book was released on 2014-04-24 with total page 705 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph describes cement clinker formation. It covers multicomponent systems, clinker phase structures and their reactions with water, hydrate composition and structure, as well as their physical properties. The mineral additions to cement are described as are their influence on cement-paste properties. Special cements are also discussed. The microstructure of concrete is then presented, and special emphasis is given to the role of the interfacial transition zone, and the corrosion processes in the light of cement-phase composition, mineral additions and w/c ratio. The admixtures' role in modern concrete technology is described with an emphasis on superplasticizer chemistry and its cement-paste rheological modification mechanism. Cement with atypical properties, such as calcium aluminate, white, low energy and expansive cements are characterized. The last part of the book is devoted to special types of concrete such as self compacting and to reactive powders.

Download or read book Application of Bacterial Pigments as Colorant written by Wan Azlina Ahmad and published by Springer Science & Business Media. This book was released on 2011-10-14 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental concerns regarding continuous use of synthetic dyes saw a revival in the demand for natural dyes as natural dyes exhibit better biodegradability and generally have a higher compatibility with the environment. However, one of the limitations on the use of natural dyes or pigments is the low extraction yield factors (a few grams of pigment per kg of dried raw material). Therefore, the exploitation of other biological sources such as fungi, bacteria and cell cultures offers interesting alternative. Microbial pigments such as from bacterial origins offer the advantage in terms of production compared to pigments extracted from vegetables or animals, due to its simple cell and fast culturing technique. This book offers interesting insight into initial works carried out to demonstrate the potential use of bacterial pigment as colorant for various applications.

Download or read book Technology and War written by Martin Van Creveld and published by Simon and Schuster. This book was released on 2010-05-11 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this impressive work, van Creveld considers man's use of technology over the past 4,000 years and its impact on military organization, weaponary, logistics, intelligence, communications, transportation, and command. This revised paperback edition has been updated to include an account of the range of technology in the recent Gulf War.

Download or read book Synthetic Aesthetics written by Alexandra Daisy Ginsberg and published by MIT Press. This book was released on 2014-02-28 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: As synthetic biology transforms living matter into a medium for making, what is the role of design and its associated values?

Download or read book Mechanistic empirical Pavement Design Guide written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 2008 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Three D Wizardry written by George Wolfe and published by . This book was released on 1995 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: LEVEL: Key Stage 3 onwards. Mardi Gras-veteran George Wolfe invites you to share sculpting ideas using papier-mache, plaster, and foam. Basic tools, background and characteristics of the three media are fully explained. Activities for creating creatures large and small are accompanied by helpful illustrations and photography. A full-colour portfolio of professional and student work, examples of the use of 3-D design in actual theatre and school productions, and complete appendices bring artistic visions to life.

Download or read book Papermaking written by Ralf Weidenmüller and published by . This book was released on 1984 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Insurgencies and Countering Insurgencies written by Department of the Army and published by . This book was released on 2019-12-09 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Progress in Concrete Technology written by Canada Centre for Mineral and Energy Technology and published by Energy, Mines and Resources. This book was released on 1980 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Schaum s Outline of Theory and Problems of Feedback and Control Systems written by Joseph J. DiStefano and published by . This book was released on 1976 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: