Occurrence and leaching of problematic substances in selected waste fractions of concrete and brick


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A study of the content and leaching of a number of potentially environmentally problematic substances has been carried out in some fractions, most of which are not covered by the residual product order: surface treated and / or stained concrete, crushed non-surface treated concrete, crushed fiber reinforced cement / concrete (unpainted or surface-treated), crushed fiber-reinforced cement / concrete (surface-treated and / or stained), crushed glazed bricks and crushed glazed bricks, including tiles. Only for the concrete was it possible to obtain waste fractions. For the other fractions, the study was carried out on brand new products. The solids analyzes for all samples except crushed, uncoated concrete included determination of content of a wide range of inorganic substances after partial (DS 259) and total (EN 13656) absorption and of organic substances (TOC, hydrocarbons, polycyclic aromatic hydrocarbons, polychlorinated biphenyls and chloro paraffins). The leaching tests have included column tests (EN 14405) on 4 samples, batch leaching tests (EN 12457-1) on all samples except crushed concrete (which has already been thoroughly investigated in Environmental Project No. 1919/2018) and the investigation of leaching of four isothiazolinones (BIT, CIT , MIT and OIT, identified in Environment Project 2127/2020 as potentially problematic) from 20 samples (not brick and tile tiles). The results of the project as well as previous studies are expected to be included in the work on an upcoming revision of the Restructuring Order. The project did not include examination of the functional properties of the different fractions in relation to possible recovery. 

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