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    Polyethylene glycol molecular weight as an important parameter affecting drying shrinkage and hydration of alkali-activated slag mortars and pastes

    Year: 2018

    Journal: Constr. Build. Mater., Volume 166, nov-30, page 564–571

    Authors: Bilek, Vlastimil, Jr.; Kalina, Lukas; Novotny, Radoslav

    Organizations: project: Materials Research Centre at FCH BUT- Sustainability and Development [REG LO1211]; National Programme for Sustainability I (Ministry of Education, Youth and Sports); Czech science foundation [GA17-03670S]

    Keywords: Alkali-activated slag; Polyethylene glycol; Molecular weight; Shrinkage; Hydration; Strength; Porosity; Surface tension

    The aim of this study was to explore the influence of ethylene glycol in a wide range of polymerization degree, i.e. from monomer (EG) up to polyethylene glycol (PEG) with molecular weight of about 35,000, on properties of alkali-activated slag mortars. Changes in molecular weight and dose of all tested glycols had only minor effect on compressive strength, while drying shrinkage was significantly affected by both these factors. EG had negligible impact on drying shrinkage, but other tested glycols reduced it significantly with PEG2000 and PEG10000 being the most effective. Such different shrinkage behavior was attributed to the changes in surface tension and pore structure. All tested glycols reduced the total heat released during the hydration and interestingly modified the heat flow depending on their molecular weight. (C) 2018 Elsevier Ltd. All rights reserved.
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