The effectiveness of use of cellulose ethers in mortars based on alkali-activated slag cement for self-levelling screeds
Journal Title: Вісник Одеської державної академії будівництва та архітектури - Year 2017, Vol 1, Issue 66
Abstract
Generally, water-retaining admixtures based on cellulose ethers are developed for traditional binders (Portland cement and gypsum) systems. However, alkali-activated cements are characterized by an increased alkalinity of the medium, which is caused by compounds of sodium or potassium nature and characterized by high concentration of such electrolytes. This feature determines the differences in the manifestation of the functional properties of chemical admixtures, including the problem of their compatibility in the medium of alkali-activated cements. The main purpose of this study is to determine the influence of the anionic and non-ionic chemical types of cellulose ethers on the physical and mechanical properties of the mortars based on alkali-activated slag cement and justification of their effectiveness for use in the recipes for self-levelling screeds. The cementitious composition was presented by alkali-activated slag cement including the mixture of soda ash and sodium metasilicate pentahydrate as the alkaline component. The tests of fresh and hardened mortars were carried out according to Ukraine national standard DSTU B В.2.7-126:2011. The research showed the lack of improvement in water retention capacity of fresh mortars, when most types of cellulose ethers were used in the hydration medium of alkali-activated slag cement, and substantiated the effectiveness of the use of anionic chemical type of cellulose ethers, which improves the water-retaining along with regulated flowability and compressive strength of the mortars.
Authors and Affiliations
V. V. , Omelchuk, R. F. , Runova, I. I. , Rudenko
Keywords
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