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

článek v časopise ve Web of Science, Jimp

angličtina

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.

Alkali-activated slag, polyethylene glycol, leaching, surface tension

BÍLEK, V.; KALINA, L.; BARTONÍČKOVÁ, E.; POŘÍZKA, J.

1. 2. 2019

Institute of Metals and Technology

Ljubljana, Slovenia

1580-2949

Materiali in tehnologije

53

1

Slovinská republika

33

38

6

http://mit.imt.si/Revija/izvodi/mit191/bilek.pdf

http://hdl.handle.net/11012/137966