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This book forms the Proceedings of the International RILEM Workshop held in Paisley in March 1993. It contains contributions on theoretical and practical aspects of the use of special concretes, with a particular focus on their behaviour in the fresh state.
Practical production of ordinary and special, high performance concretes and their behaviour and properties when fresh are the main themes of this book. It derives from the International RILEM Conference held in Paisley, Scotland in June 1996, and represents the culmination of the work of two RILEM Technical Committees (145 WSM Workability of Special Mixes, and 150 ECM Efficiency of Concrete Mixers). Very significant advances have been made recently in the development of concrete with outstanding properties. Such advances in research must be matched by progress in the technology of concrete production. This book focuses on production methods and on workability and handling, two fundamental and closely linked stages of the concrete construction process. It has a strongly practical emphasis, with many contributions showing how to build effectively using the many high performance concretes which have progressed from research into construction in recent years. The main themes covered are: production mixers and mixing processes; production methods; sprayed and very dry precasting mixes; fibre reinforced concrete; flowing and superfluid mixes; rheology; test methods; mix design and models; special cements and concretes.
This book is trying to help expand the knowledge of fresh concrete workability. Concrete workability depends on lots of parameters and varies significantly with conditional alteration. The temperature is of great importance determining the workability. This book presents theoretical information and experimental discussions investigating the influence of fresh concrete temperature and ingredients on the workability. Programming and different statistical programs are applied to include the most appropriate results. Artificial neural network prediction of workability is investigated in two situations; with and without concrete temperature. The most relevant cutting edge studies on this issue are cited and discussed to support the readers for the future studies. Ce livre essaie de faire progresser la connaissance de la fluidit du bton frais. La fluidit du bton dpend de beaucoup de paramtres et varie de manire significative avec le changement des conditions (temprature, humidit, souffle du vent, lumire du soleil). La temprature a beaucoup d'importances pour dterminer la fluidit. Ce livre prsente des informations thoriques et des discussions exprimentales pour examiner l'influence de la temprature du bton frais et les ingrdients sur la fluidit. La programmation et les diffrents programmes statistiques ont t appliqus afin d'obtenir les rsultats les plus appropris. La prdiction de fluidit de RNA (le rseau de neurones artificiels) a t tudi dans deux situations: avec et sans temprature du bton frais. Les plus pertinentes recherches, concernant ce sujet, ont t faites pour appuyer les lecteurs aux tudes futures.
The design of concrete mixes is becoming increasingly complex, with the addition of new materials in the compounds, such as organic admixtures, fibres and supplementary cementitious materials. Moreover, the list of properties which concretes are required to possess for certain applications has increased, and interest is developing in rheology, dura
The complexity of specifications and the number of materials options available today for concrete production mean that the traditional procedure of making trial mixes is now unnecessary, expensive and time consuming. Using J.D Dewar's research, this book shows how a small amount of materials data can be used confidently to predict the composition o
This book summarizes and simplifies the results of a considerable body of research and practical experience with a wide range of fiber-reinforced cementitious composites.
Fresh concrete is generally featured in publications on concrete technology where the focus is often on fundamental rheology or diverse research methods, or the standards describe the tests but do not provide practical advice on interpretation of the results. This book aims to fill the gap between highly scientific and fundamental works and the many fragmented test specifications. It summarises the existing knowledge on the properties of fresh concrete in a form accessible to practicing engineers and concrete technologists. It includes a manual of practical tests which cover both the standard tests in major countries and new tests specifically applicable to site testing. The testing equipment required and the procedures are described in sufficient detail for the tests to be carried out, with references to selected national standards when compliance with specific conditions applicable in those countries is required. Particular attention is paid to properties of special fresh concrete mixes which are increasingly used in practical construction. The work will be of interest to engineers and others involved in the research, development, design and execution of concrete construction, including those working in EEC countries.