Abstract
Length change of cement based materials due to drying and wetting has been classically studied and various mechanisms have been proposed. Recently, it was reported that the structural change of amorphous calcium silica hydrates (C-S-H), especially, by drying at low relative humidity, can greatly affect macroscopic shrinkage and irreversible behavior. In addition, it has been pointed out that the water transport in the dried cement based materials can be influenced by the C-S-H swelling due to the wetting to cause anomalous water uptake. In this study, the length change and water uptake of synthesized calcium silica hydrates powder and commercial porous materials with tobermorite or xonotlite are examined focusing on the effect of crystalline structural change due to drying and wetting. The powder was compacted to be used for length change. It was found that there is no hysteresis even at low relative humidity in the case of tobermorite and xonotlite with well-ordered structures and the unique expansion with drying was found at high relative humidity. The water uptake amount in the porous materials mainly consisting of tobermorite or xonotlite is almost proportional to square root of time to satisfy Washburn’s theory. The secondary imbibition period was slightly observed only in porous materials containing tobermorite like cement paste. It may be attributed to the slow water penetration into the layer structure of tobermorite. The characteristics of water uptake in the materials compacted by synthesized C-S-H powder is dependent on CaO/SiO2 mole ratio.
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Asamoto, S., Koyama, R., Matsui, K., Takahashi, K. (2023). Length Change and Water Uptake Characteristics of Synthesized Calcium Silicate Hydrates. In: Jędrzejewska, A., Kanavaris, F., Azenha, M., Benboudjema, F., Schlicke, D. (eds) International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures. SynerCrete 2023. RILEM Bookseries, vol 44. Springer, Cham. https://doi.org/10.1007/978-3-031-33187-9_71
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