During the production of cast concrete blocks, concrete grinding sludge is produced in large quantities and usually disposed of in landfills, which comes at a great expense. As part of a research project carried out in cooperation between the Technical University Cologne and the company Metten Stein+Design, the recyclability of grinding sludge within the concrete product plant's own production cycle was investigated. The aim was to use the fine-grained grinding sludge as a concrete additive or cement substitute in the core concrete of concrete paving blocks. Following the characterization of the grinding sludge samples, which were generated from the ongoing production of cast concrete blocks, the influence on fresh and hardened concrete properties was investigated. Testing included workability and compressive strength on mixes representing the core concrete of paving blocks.
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K. Ochwat, Laboratory for Building Materials Technology, Technical University of Cologne, Cologne, Germany B. Siebert, Laboratory for Building Materials Technology, Technical University of Cologne, Cologne, Germany G. Volmer, METTEN Concrete Solutions GmbH, Germany