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Reuse of By-Products from Ready-Mixed Concrete Plants for the Production of Cement Mortars

Original scientific paper

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 1, Issue 2, June 2013, pp 152-162
DOI: https://doi.org/10.13044/j.sdewes.2013.01.0011
Monika Zervaki1 , Christos Leptokaridis2, Stamatis Tsimas1
1 Department of Chemical Engineering, National Technical University of Athens, Greece
2 Group R&D and Quality Department, Titan Cement Company S.A., Greece


This study was motivated by the necessity to recycle sludge water resulting from washing out concrete mixing trucks - a problem of both environmental and economic importance for the ready-mixed concrete industry. Sludge water from ready-mixed concrete plants as well as dry sludge, which is derived from the settling of the water, are hazardous for disposal due to their high pH value (pH>11.5). In this work, cement mortars were composed using either sludge water after various treatment, or dry sludge in several ratios. The cement mortars were tested for their workability and strength development. The purpose of this experimental design was to prove that sludge water, as well as sludge in a wet or dry form, can be used in the production of mortars without degrading any of their properties.

Keywords: Ready-mixed Concrete, Sludge Water, Filler, Cement Mortar, Sludge, Strength

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