Influence of Curing Methods on the Performance of Alkali-activated Materials Incorporating Volcanic Glass Powder as the Primary Precursor

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  • Osako Yuma
    Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, 860-8555 Kumamoto, Japan.
  • Onoue Kozo
    Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, 860-8555 Kumamoto, Japan.
  • Sagawa Yasutaka
    Department of Civil and Structural Engineering, Kyushu University, 744 Motooka, Nishi-ku, 819-0395 Fukuoka, Japan.
  • Kawasaki Ryusei
    Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, 819-0395 Fukuoka, Japan.

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<p>This study investigates the potential of volcanic glass powder (VGP) as the primary precursor in alkali-activated materials (AAMs), using a blend of 70% VGP and 30% ground granulated blast-furnace slag. The influence of curing conditions before and after demolding on strength and durability was evaluated. Sealed curing at 80 °C for 24 hours enhanced C-A-S-H gel stability, improved early strength, and reduced drying shrinkage, but resulted in decreased long-term strength and sulfuric acid resistance. Conversely, sealed ambient curing promoted the development of a denser microstructure and higher long-term strength, albeit with increased drying shrinkage. The findings underscore the pivotal role of curing in optimizing the performance of VGP-based AAMs.</p>

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