4.7 Article

Distinctive rheological and temporal viscoelastic behaviour of alkali-activated fly ash/slag pastes: A comparative study with cement paste

期刊

CEMENT AND CONCRETE RESEARCH
卷 144, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2021.106441

关键词

Rheology; Viscoelasticity; Alkali-activated materials; Yield stress; Rigidification

资金

  1. Australian Government Research Training Program Scholarship
  2. faculty of engineering at the UNSW Sydney

向作者/读者索取更多资源

This study investigates the fundamental differences in viscoelasticity between alkali-activated fly ash/slag materials (AAMs) and cement pastes, showing that the activator viscosity significantly affects the rheological behavior of AAM pastes. The temporal changes in viscoelasticity reveal negligible colloidal interactions between particles in AAM paste until initial setting, resulting in very different viscoelastic behavior compared to well-percolated network in cement paste.
This paper presents the results of the investigation on the fundamental differences in the viscoelasticity between alkali-activated fly ash/slag materials (AAMs) and cement pastes. The effects of the precursor and the activator on the rheological behaviour of AAM pastes were studied. Given the specific precursor, the activator viscosity significantly affected the AAM paste viscosity. The high viscous activator increased the plastic viscosity of AAM pastes by 4-8 times higher than that of cement paste and drastically decreased the yield stress due to viscous effects and weak colloidal interactions. Temporal changes in viscoelasticity showed that the negligible colloidal interactions between particles in AAM paste made the system non-percolated until the initial setting. This resulted in very different viscoelastic behaviour compared to the one from the well-percolated network in cement paste. Considering all results obtained in this study, the paper describes the short-term evolution of the AAM paste from the fresh condition to the initial setting.

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