Evaluation of the Surfactant Leaching from Alkali-Activated Slag-Based Composites Using Surface-Tension Measurements

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Date
2019-02-01
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Mark
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Institute of Metals and Technology
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Abstract
This work tries to evaluatethe amount of surfactant leached from the AAS-based mortars using a very simple surface-tension (ST) measuring technique.Mortars based on AAS with and without2%ofPEGvarying in molecular weight (MW) were prepared. Waterglass with aSiO2-to-Na2O ratio equal to 2.0 was used at a dose corresponding to8%Na2O with respect to the slag weight. Mortarspecimens were prepared and sealed for 24 h, 3 d and 7 d. Then they were demolded and immersed in demineralized water,whose ST was monitored over time. During the early stages (from minutes to a few hours) the ST dropped rapidly, while itremained approximately constant after a few days, which indicates that organic molecules are leached from the AAS specimensvery quickly. It was observed that a relatively small fraction of PEGs can be leached out, which indicates that organic moleculesare rather bound in the matrix, unable to reduce the ST of the pore solution.
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Materiali in tehnologije. 2019, vol. 53, issue 1, p. 33-38.
http://mit.imt.si/Revija/izvodi/mit191/bilek.pdf
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en
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(C) Institute of Metals and Technology
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