The necessity of establishing material cycles in construction is indisputable. The knowledge on this topic is available in many places and is summarized and systematized in this book. After a general overview of the quantities generated, recycling rates, and application areas of recycled construction materials, the focus shifts to the processing steps on which recycling currently relies and the possibilities for influencing product properties. Furthermore, recycled construction materials are characterized, and their areas of application are presented. The starting point is always the original building material, which later reappears in construction waste. The emphasis is on the technical properties of the materials. The environmental aspects that have dominated the discussion for years are addressed to the necessary extent. The book concludes with a chapter.