Effects of Solid Activator and Fly Ash on Rheology and Thixotropy of One-Part Alkali-Activated Pastes

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  • Alrefaei Yazan
    Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong.
  • Wang Yan-Shuai
    Shenzhen University, College of Civil and Transportation Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Shenzhen, China.
  • Qian Ye
    Department of Civil Engineering, The University of Hong Kong, Hong Kong.
  • Dai Jian-Guo
    Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong.

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<p>Compared with conventional two-part alkali-activated materials (AAMs), one-part AAMs have several advantages, especially the simple production using only water similar to ordinary Portland cement. However, one-part AAMs are much less researched, especially in terms of rheology. Understanding the rheological behavior of such binders is a crucial step for their production, placement, and application in the construction industry. This paper studies the rheological properties of one-part AAMs through evaluating the dynamic yield stress, static yield stress, and thixotropic index. The effects of solid activator content, besides the effect of two types of fly ash (containing different amounts of carbonaceous impurities) with varying contents, are explored. The possible mechanisms are also discussed.</p>

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