Concrete is decidedly the world's most important building material today. Approximately twice as much concrete is used each year compared with all other building materials combined. CONCRETE - History and Accounts addresses the exciting history of concrete, from its humble beginnings, through ancient history and Roman times, up to modern-day concrete made of Portland cement. A number of specialist fields from the more recent history of concrete are treated in separate chapters. In the final chapter the author attempts to predict the future of this building material. The book is peppered with examples, accounts, and anecdotes from a number of countries. Per Jahren holds a master's degree in civil engineering from NTH (Norwegian Institute of Technology), where he studied concrete as his main subject. He has also maintained a private interest in the history of concrete for many years Jahren has extensive experience of the building sector, especially relating to the use of concrete, and is still active in this field. He has written well over 100 technical articles and papers, and has held lectures in almost 30 countries. Jahren is a former chairman of Norsk Betongforening (the Norwegian Concrete Association), and a member of ACI's (American Concrete Institute) History of Concrete committee.