The influence of curing conditions on the mechanical properties and leaching of inorganic polymers made of fayalitic slag
Remus I. Iacobescu1, Valérie Cappuyns2,3, Tinne Geens4, Lubica Kriskova1, Silviana Onisei1, Peter T. Jones1, Yiannis Pontikes1()
1. KU Leuven, Department of Materials Engineering, 3001 Leuven, Belgium 2. KU Leuven, Department of Earth and Environmental Sciences, 3001 Leuven, Belgium 3. KU Leuven, Faculty of Economics and Business, 1000 Brussels, Belgium 4. KU Leuven, Department of Healthcare and Technology, 3001 Leuven, Belgium
This study reports on the impact of the curing conditions on the mechanical properties and leaching of inorganic polymer (IP) mortars made from a water quenched fayalitic slag. Three similar IP mortars were produced by mixing together slag, aggregate and activating solution, and cured in three different environments for 28 d: a) at 20 °C and relative humidity (RH) ~ 50% (T20RH50), b) at 20 °C and RH≥90% (T20RH90) and c) at 60 °C and RH ~ 20% (T60RH20). Compressive strength (EN 196-1) varied between 19 MPa (T20RH50) and 31 MPa (T20RH90). This was found to be attributed to the cracks formed upon curing. Geochemical modelling and two leaching tests were performed, the EA NEN 7375 tank test, and the BS EN 12457-1 single batch test. Results show that Cu, Ni, Pb, Zn and As leaching occurred even at high pH, which varied between 10 and 11 in the tank test’s leachates and between 12 and 12.5 in the single batch’s leachates. Leaching values obtained were below the requirements for non-shaped materials of Flemish legislation for As, Cu and Ni in the single batch test.
. [J]. Frontiers of Chemical Science and Engineering, 2017, 11(3): 317-327.
Remus I. Iacobescu, Valérie Cappuyns, Tinne Geens, Lubica Kriskova, Silviana Onisei, Peter T. Jones, Yiannis Pontikes. The influence of curing conditions on the mechanical properties and leaching of inorganic polymers made of fayalitic slag. Front. Chem. Sci. Eng., 2017, 11(3): 317-327.
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