Print Email Facebook Twitter An experimental study on the recovery of the hardened cement from crushed end of life concrete Title An experimental study on the recovery of the hardened cement from crushed end of life concrete Author Lotfi, S. Rem, P.C. Faculty Civil Engineering and Geosciences Department Structural Engineering Date 2015-06-17 Abstract In the C2CA concrete recycling process, autogenous milling of the crushed End of Life (EOL) concrete is a mechanical method to remove cement paste from the surface of aggregates. During autogenous milling, the combination of shearing and compression forces, promotes selective attrition and delivers a better liberation. In order to investigate the effects of shear and compression on the cement recovery and specify the importance of them, a new set-up is designed and constructed. This set-up permits aforesaid forces to be determined and controlled. For experimental design, the MINITAB 16 software was used and 13 different experimental runs based on varying shear and compression forces were conducted. After each experiment, the amount of cement recovery using XRF analysis, water absorption of the recycled aggregates and energy consumption during the process were measured. Results show that both shear and compression forces have in?uence on improving the cement recovery. With simple changes in the setting of an autogenous mill like bed height or residence time the need for high-cost secondary crushing during concrete recycling could be eliminated. Subject concrete recyclingcement recoveryrecycled aggregate To reference this document use: http://resolver.tudelft.nl/uuid:b5870481-1ba4-478a-a82e-e6c58b3f7996 Publisher Delft University of Technology ISBN 978-94-6186-480-2 Source EMABM 2015: Proceedings of the 15th Euroseminar on Microscopy Applied to Building Materials, Delft, The Netherlands, 17-19 June 2015 Part of collection Institutional Repository Document type conference paper Rights (c) 2015 Creative Commons BY NC ND Files PDF 317863.pdf 771.07 KB Close viewer /islandora/object/uuid:b5870481-1ba4-478a-a82e-e6c58b3f7996/datastream/OBJ/view