Effects of recycled aggregates from construction and demolition wastes on mechanical and permeability properties of paving stone, kerb and concrete pipes

The main objective of this research is to investigate the utilization criteria of the recycled aggregates gained from construction and demolition wastes, in the production of various ready-mixed and precast concrete elements. Within this scope, construction and demolition waste materials were selectively separated to have homogeneous concrete wastes in the recycling plant. Then, fine and coarse aggregates were achieved from concrete wastes. Recycled concrete aggregates were than crushed to specific sizes; physical properties were determined and compared with those of normal aggregates. Finally, these recycled aggregates were investigated about their utility in the industrial production of various concrete products like ready-mixed concrete, concrete pipe, paving stone and kerbs. Also some studies were done to determine durability and permeability properties of these products. It can be concluded that the use of recycled aggregates in the production of various concrete elements is possible with proper separation and classification. Moreover, lower replacement rates should be applied to obtain sufficient conditions which are specified in related product standards. (C) 2016 Elsevier Ltd. All rights reserved.