高流動コンクリート(1)

[V-436] Chronological change of slump flow and air content of high-fluidity concrete with fly ash

〇Taku Otsuka¹, Takeshi Yamamoto¹, Tadashi Shinohara² (1.Central Research Institute of Electric Power Industry, 2.CERES)

Keywords:fly ash, slump flow, chronological change, material segregation, high fluidity concrete

In the current JIS, it is necessary to increase compressive strength in order to set a larger slump flow, and temperature cracks may occur due to heat of hydration. Therefore, as a method of ensuring the resistance for material segregation while suppressing the heat of hydration, we focused on concrete mixed with fly ash replacing part of cement and confirmed the fresh properties when the type of admixture was changed. It was shown that the chronological change of air content was hardly affected by the admixture, but the slump flow had a large difference by the type of admixture. In the future, it is necessary to confirm whether the result is a peculiar phenomenon when fly ash is mixed.