Hirokatsu Mori;Eiji Maruya;Akira Sasaki;Toshiyuki Takahashi;
<正>The portland cement-calcium aluminate cement-anhydrite system is useful for various construction materials because it can provide various physical properties by adjusting the proportions.For example,this system is used for self-levelling material to provide the properties of early drying,rapid hardening,and small length change.However,this system is very sensitive to temperature,which is a significant problem.This study investigated the temperature dependence of length change of self-levelling material based on the portland cement-calcium aluminate cement-anhydrite-blast furnace slag system with several portland cement / calcium aluminate cement ratios at 5℃and 20℃. At 5℃,the maximum expansion of the self-levelling material increased with increasing portland cement / calcium aluminate cement ratios.The results of a hydration analysis by X-ray powder diffraction for a high portland cement / calcium aluminate cement ratio at 5 V revealed that the reaction of CA(in calcium aluminate cement) reaction was delayed and the reaction of C3S(in portland cement) reaction was accelerated, compared with a sample with a low portland cement / calcium aluminate cement ratio. In contrast,there was no remarkable difference between the two,regardless of the Portland cement / calcium aluminate cement ratio,at 20℃.In this study,it was obvious that the combination of low temperature(5℃) and high portland cement / calcium aluminate cement ratio resulted in the increase in maximum expansion. Originality Temperature dependence of some physics is significant problem for portland cement-calcium aluminate cement-anhydrite systems.However,little is known quantitatively about the temperature dependence of the system.This study examined the influence of the portland cement / calcium aluminate cement ratio on the temperature dependence of length change in self-levelling material based on the portland cement-calcium aluminate cement-anhydrite-blast furnace slag system at middle-low temperatures by a hydration analysis involving the hydration rate of C_3S and CA,SEM observations,and the amount of ettringite.
Self-levelling material;;Length change;;Temperature dependence;;Portland cement;;Calcium aluminate cement
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