Part I: Recycled aggregates and recycled aggregate concrete: third state-of-the-art report 1945-1989. Professor T C Hansen, Technical University of Denmark. Introduction. First state-of-the-art report 1945-1977. Second and third state-of-the-art reports 1978-1989. Terminology. Original concrete. Production of recycled aggregate. Quality of recycled aggregates. Mechanical properties of recycled aggregate concrete. Durability of recycled aggregate concrete. Properties and mix design of fresh recycled aggregate concrete. Production of recycled aggregate concrete. Use of crushed concrete fines for other purposes than production of new concrete. Products, codes, standards, and testing methods for recycled aggregate concrete. Economic aspects of concrete recycling. Energy aspects of concrete recycling. Practical case histories. Recycling of fresh concrete wastes. Conclusions and recommendations. Acknowledgements. Literature references. Appendix A. Part II: Recycling of masonry rubble. Dr R R Schulz, Institute for Building Materials Testing, Waldkirch, West Germany, Dr Ch F Hendricks, Road Engineering Division, Rijkswaterstaat, Netherlands. Introduction. Historical survey. Prospects. Walling materials. Masonry rubble. Preparation of masonry rubble. Properties of crushed masonry aggregate. Fresh concrete - composition and properties. Properties of hardened concrete. Durability of crushed masonry concrete. Applications. Ground powder from masonry rubble as binder. Standards, guidelines and instructions for production of crushed masonry aggregates and crushed masonry concrete. Economic aspects of the recycling of masonry rubble. Conclusions. References. Part III: Blasting of concrete: localized cutting in and partial demolition of concrete structures. C Molin, Trimex, Sweden, E K Lauritzen, Demex, Consulting Engineers Ltd, Copenhagen, Denmark. Foreword. Summary. Background and objectives. The principles of disintegration. Blasting techniques. The effect on nearby concrete. The effect on the environment. A brief comparison with other methods. Practical examples of blasting. Fragmentation of reinforced concrete. Conclusions. The need for research and development. References. Index.
