Civil Engineering Association

Ultra High Performance Concrete (UHPC) Proceedings of the Second International Symposium on Ultra High Performance Concrete Kassel, Germany March 05-07, 2008

Preface
Ultra High Performance Concrete (UHPC) not only offers superior compressive strength but also extraordinary ductility and far more durability than ordinary concrete. It enables to build structures which are sustainable and economical and come with light and filigree appearance at the same time. During the last four years, since the First International Symposium on Ultra High Performance Concrete held in Kassel in 2004, UHPC has gained much more attendance all over the world, being it by different types of applications for interesting structures or by research on the material itself and the optimization of its production and behaviour. Much of this work has been presented and discussed at the Second International Symposium on Ultra High Performance Concrete in Kassel in 2008 in more than 100 lectures. The presentations have given a broad survey of all aspects of UHPC including raw materials, micro- and macro-structures, mechanical behaviour, durability as well as of construction and design specifications appropriate for this material. Exciting architectural concepts and many examples of interesting engineering applications have been presented at the symposium. The symposium was organized by the Institute of Structural Engineering, Faculty of Civil Engineering of the University of Kassel, Germany. The Conference Proceedings contain the conference papers and presentations. We hope that the conference and the excellent papers will promote further development and exploitation of Ultra High Performance Concrete – one of the most challenging construction material for the 21st century.
Kassel, March 2008
Prof. Dr.-Ing. Ekkehard Fehling Prof. Dr.-Ing. habil. Michael Schmidt

Ultra-High Performance Concrete UHPC

Selected chapters from the German concrete yearbook are now being published in the new English "Beton-Kalender Series" for the benefit of an international audience.
Since it was founded in 1906, the Ernst & Sohn "Beton-Kalender" has been supporting developments in reinforced and prestressed concrete. The aim was to publish a yearbook to reflect progress in "ferro-concrete" structures until - as the book's first editor, Fritz von Emperger (1862-1942), expressed it - the "tempestuous development" in this form of construction came to an end. However, the "Beton-Kalender" quickly became the chosen work of reference for civil and structural engineers, and apart from the years 1945-1950 has been published annually ever since.
Ultra high performance concrete (UHPC) is a milestone in concrete technology and application. It permits the construction of both more slender and more durable concrete structures with a prolonged service life and thus improved sustainability.
This book is a comprehensive overview of UHPC ? from the principles behind its production and its mechanical properties to design and detailing aspects. The focus is on the material behaviour of steel fibre-reinforced UHPC. Numerical modelling and detailing of the connections with reinforced concrete elements are featured as well. Numerous examples worldwide ? bridges, columns, façades and roofs ? are the basis for additional explanations about the benefits of UHPC and how it helps to realise several architectural requirements.
The authors are extensively involved in the testing, design, construction and monitoring of UHPC structures. What they provide here is therefore a unique synopsis of the state of the art with a view to practical applications.