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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Study of hydration behaviors of wood-cement mixtures: compatibility of cement mixed with wood fiber strand obtained by the water-vapor explosion process

Journal of Wood Science volume 48, pages 365–373 (2002)Cite this article

Abstract

To provide information on the feasibility of using exploded wood fiber strand (WFS) obtained by the water-vapor explosion process in wood-cement mixtures, the compatibility between cement and exploded WFS and its improvement with various additive chemicals were investigated by observation and analysis on hydration behaviors in terms of hydration characteristics: maximum hydration temperature (T max) and required time (t max). The three types of cement, six additive chemicals, and exploded WFS (sugi, air-dried and water-soaked) were employed as raw materials in this study. The hydration behaviors of mixtures demonstrated that exploded WFS had strong retarding effects on cement hydration and completely prevented mixtures from setting. The analysis of sugar revealed that the sugar contents of exploded WFS were much higher than those in unexploded wood and increased to about 20-fold (air-dried) and 10-fold (water-soaked), respectively. The degraded polysaccharides became a major factor and played an important role in inhibiting the setting of cement. Moreover, high-performance liquid chromatography analysis proved that the main peaks representing the molecular weight of polysaccharides in extractives of exploded WFS shifted markedly to a lower range of polymerization. MgCl2 was determined to be an effective additive chemical for restraining the inhibitory influences. Addition contents of 2%–3% and 4%–5% were available and acceptable for quick-curing cement and ordinary Portland cement, respectively. As for the furnace-slag cement, the composite additive chemicals of MgCl2 (4%) and CaO (2%) were found to have an obvious accelerating effect.

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Authors and Affiliations

  1. Institute of Agricultural and Forest Engineering, University of Tsukuba, Tsukuba, 305-8572, Ibaraki, Japan

    Yi Min Wei & Bunichiro Tomita

  2. Adhesion and Glue Laminating Laboratory, Department of Wood-Based materials, Forestry and Forest Products Research Institute (FFPRI), 305-8687, Tsukuba, Japan

    Yasushi Hiramatsu, Atsushi Miyatake & Tsuyoshi Fujii

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  1. Yi Min Wei
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  2. Bunichiro Tomita
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  3. Yasushi Hiramatsu
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  4. Atsushi Miyatake
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  5. Tsuyoshi Fujii
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Correspondence to Yi Min Wei.

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Wei, Y.M., Tomita, B., Hiramatsu, Y. et al. Study of hydration behaviors of wood-cement mixtures: compatibility of cement mixed with wood fiber strand obtained by the water-vapor explosion process. J Wood Sci 48, 365–373 (2002). https://doi.org/10.1007/BF00770695

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  • DOI: https://doi.org/10.1007/BF00770695

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