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[119380] Artykuł: Effect of cellulose ether and starch ether on hydration of cement processes and fresh-state properties of cement mortarsCzasopismo: Materials Tom: 15, Zeszyt: 24ISSN: 1996-1944 Opublikowano: Grudzień 2022 Autorzy / Redaktorzy / Twórcy Grupa MNiSW: Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A) Punkty MNiSW: 140 Pełny tekst DOI Słowa kluczowe: eter celulozy  eter skrobi  VMA  zaprawa cementowa  konsystencja  wskaźnik retencji  właściwości aplikacyjne  czas wiązania  proces hydratacji  pomiary kalorymetryczne  Keywords: cellulose ether  starch ether  VMA  cement mortar  consistency  water retention  application properties  setting time  hydration process  calorimetric measurements  |
The production of factory-made mortars is a multicomponent system. Viscosity-modifying admixtures (VMAs) are an inherent ingredient of these materials. The correct choice of the amount and type of these admixtures is important from the practical and scientific points of view. In this article, the use of cellulose ether (CE) and starch ether (SE) in cement pastes and mortars is studied. This research focuses on the hydration process and fresh-state properties of mortars because this subject determines the correct choice of the amount and type of admixture used, and the results determine the application and properties of hardened mortars. Polymers were added in the range from 0.056% to 0.22% in relation to the dry ingredients of the mortar. The research showed that cellulose ether had the greatest impact on the consistency, air content, bulk density, and water retention of ordinary dry-mix mortars. On the other hand, starch ether affected the hydration process, delaying the setting and hardening processes much more than cellulose ether. The action of these admixtures rose with the increase in the amount of polymer used in different ways (depending on the type of ether).