In the context of the energy transition, the conventional supplementary cementitious materials (SCMs) from the co-products of heavy industries may disappear. Therefore, new SCMs should be developed. With the publication of JIS A 6209, volcanic glass powder (VGP) produced from Kagoshima was identified as an SCM. One advantage of producing VGP is that it does not require calcination, resulting in low energy consumption during the manufacturing process. To expand the production of VGP, the Iizaka Silt produced from the volcanic ejecta of Iizaka (Nakano-Hakudo) was tested in this study. The XRD/Rietveld analysis showed that Iizaka Silt has 7different minerals accounting for about 20mass%. Many holes were observed on the surface of Iizaka Silt by SEM, resulting in a large BET-surface area of Iizaka Silt. The isothermal calorimetry showed that the SiltF had a strong filler effect on the cement hydration. The filler effect of Iizaka Silt was quantified by the relationship between the slope of the acceleration period and the total surface of solids. Iizaka Silt exhibited pozzolanic reactivity through the selective dissolution experiment. However, neither of them contributed to the compressive strength. It was found that the gel space ratio decreased with the substitution of OPC by Iizaka Silt, which resulted in low compressive strength.
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