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. 1. Introduction 2. Principles for the production of UHPC 2.1 Development 2.2 Basic material concepts 2.3 Raw materials 2.4 Mix composition 2.5 Mixing 2.6 Curing and heat treatment 2.7 Testing 3. Mechanical properties of the hardened concrete 3.1 General 3.2 Behaviour in compression 3.3 Behaviour in tension 3.4 Shrinkage 3.5 Creep 3.6 Multi-axial stresses 3.7 Fatigue behaviour 3.8 Dynamic actions 3.9 Fire resistance 3.10 UHPC with combinations of fibres (?fibre cocktails?) 4. Durability 4.1 Microstructure 4.2 Resistance to aggressive media 4.3 Classification in exposure classes 5. Design principles 5.1 Influence of fibre distribution and fibre orientation 5.2 Analyses for the ultimate limit state 5.3 Analyses for the serviceability limit state 6. Connections 6.1 General 6.2 Dry joints 6.3 Glued joints 6.4 Wet joints 6.5 Grouted joints 6.6 Adding UHPC layers to existing components to upgrade structures 7. Projects completed 7.1 Bridges 7.2 Applications in buildings 7.3 Other applications 8. Acknowledgements 9. References