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Influence of hydrothermal synthesis conditions and carbonation on physical properties of xonotlite-based lightweight material
Highlights Using cement as a starting material to produce xonotlite-based lightweight material (Xo_ALC). Effective hydrothermal synthesis condition for xonotlite formation is at 230 °C for the autoclaving time of more than 18 h. Pore size distribution of autoclaved specimen shifts to the coarser region due to the crystallization of xonotlite and carbonation. Compressive strength of Xo_ALC is slightly increased after carbonation. The carbonation of Xo_ALC occurs more quickly than autoclaved aerated concrete.
Abstract This paper investigates the effect of the hydrothermal synthesis conditions on the formation of xonotlite and the change of xonotlite-based lightweight material’s (Xo_AAC) physical properties under carbonation. Experiments included: quantitative X-ray diffraction, scanning electron microscopy, thermogravimetric differential thermal analysis, drying shrinkage, carbonation shrinkage, compressive strength, mercury intrusion porosimetry, thermomechanical analysis, solid-state nuclear magnetic resonance, water vapor absorption isothermal, and nanoindentation test. The pure crystalline xonotlite was formed at 230 °C for the autoclaving time of more than 18 h and at short heating time (2 h). The drying shrinkage and dimensional change rate of Xo_AAC were smaller than that of autoclaved aerated concrete (AAC). The compressive strength of Xo_AAC was slightly increased after carbonation. The carbonation of Xo_AAC occurred more quickly than AAC containing silicone oil. However, the amount of carbonation shrinkage was almost the same for both Xo_AAC and AAC in a later period.
Influence of hydrothermal synthesis conditions and carbonation on physical properties of xonotlite-based lightweight material
Highlights Using cement as a starting material to produce xonotlite-based lightweight material (Xo_ALC). Effective hydrothermal synthesis condition for xonotlite formation is at 230 °C for the autoclaving time of more than 18 h. Pore size distribution of autoclaved specimen shifts to the coarser region due to the crystallization of xonotlite and carbonation. Compressive strength of Xo_ALC is slightly increased after carbonation. The carbonation of Xo_ALC occurs more quickly than autoclaved aerated concrete.
Abstract This paper investigates the effect of the hydrothermal synthesis conditions on the formation of xonotlite and the change of xonotlite-based lightweight material’s (Xo_AAC) physical properties under carbonation. Experiments included: quantitative X-ray diffraction, scanning electron microscopy, thermogravimetric differential thermal analysis, drying shrinkage, carbonation shrinkage, compressive strength, mercury intrusion porosimetry, thermomechanical analysis, solid-state nuclear magnetic resonance, water vapor absorption isothermal, and nanoindentation test. The pure crystalline xonotlite was formed at 230 °C for the autoclaving time of more than 18 h and at short heating time (2 h). The drying shrinkage and dimensional change rate of Xo_AAC were smaller than that of autoclaved aerated concrete (AAC). The compressive strength of Xo_AAC was slightly increased after carbonation. The carbonation of Xo_AAC occurred more quickly than AAC containing silicone oil. However, the amount of carbonation shrinkage was almost the same for both Xo_AAC and AAC in a later period.
Influence of hydrothermal synthesis conditions and carbonation on physical properties of xonotlite-based lightweight material
Duc Van, Nguyen (author) / Imasawa, Kouichi (author) / Hama, Yukio (author)
2022-01-03
Article (Journal)
Electronic Resource
English
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