It is a usual procedure in Germany to separate fresh concrete waste into reclaimed washed aggregates and slushwater with help of special wash drums. The production of new concrete utilizes both the reclaimed washed aggregates and the slushwater. Currently, the use of reclaimed aggregates is limited to five percent by mass with regard to the total amount of aggregates in the concrete production. A research project commissioned by the German Ready-Mixed Concrete Association (BTB) and funded by the German Federal Ministry of Economics and Technology (BMWi) now investigates a significant increase of this limit. The Technical University of Kaiserslautern examines which percentage of the reclaimed aggregates can be reused in the new concrete composition without affecting the concrete properties. Practical tests with different ready-mixed concrete companies will validate the results from the laboratory examinations and contribute to the adaptation of existing German regulations.
Berlin, 28 Feb 2017