Journal
CEMENT AND CONCRETE RESEARCH
Volume 33, Issue 7, Pages 1005-1011Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-8846(02)01096-7
Keywords
alkali-activated slag paste; activator; alkali modulus; setting time; retarder
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In this paper, we investigate which factor for a sodium silicate-based activator influences the setting time of alkali-activated slag (AAS) paste. Several factors, such as the pH value of the activator, the alkali modulus (AM) and the alkali activator dosage, were evaluated when the liquid/slag ratio was kept constant. It was found that the pH value and the AM have a strong relationship, however, they have no distinct relationship with the setting time. The activator dosage, which is defined as the sum of the SiO2 and Na2O concentrations, shows a significant trend with the setting time. It was also found that the influence Of SiO2 on the setting time is more apparent than that of Na2O. Increasing amounts Of SiO2 decrease the pH value of the activator and increasing amounts of Na2O increase the pH value of the activator. Phosphoric acid, used as a retarder, was found to have a strong retarding effect. (C) 2003 Elsevier Science Ltd. All rights reserved.
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