補修・補強（材料）(3)

[V-126] Seismic retrofitting using cement-based spraying method in a subfreezing environment

〇Makoto Shoji¹, Yukinobu Takayanagi², Yasuhiro Ishihara³, Koji Masuda⁴, Hironori Matsukubo¹ (1.Denka, 2.NIPPON JUICE TERMINAL, 3.Jinno Kensetsu, 4.Denka Renotec)

Keywords:below freezing, wet spraying method, seismic strengthening, long distance pressure feed, thickening mortar, rapid hardening

Seismic reinforcement of tanks inside the building managed to be below freezing was performed using cement-based materials. During construction, the room temperature is below freezing, and the distance from the indoor entrance to the tank is about 60 m. Therefore, we adopted a spraying method that is a cement-based repair material that cures even in a -10 ° C environment and can be pumped over a long distance from the mixing and mixing site. In the test construction, the workability and hardening properties of the mortar and the temperature of the tank contents were measured.