	US 12,319,617 B2
	Cement grout material and installation method of same
Kenichi Yoshioka, Sapporo (JP); and Yuhji Sudoh, Tokyo (JP)
Assigned to NIPPON HIGH STRENGTH CONCRETE CO., LTD., Sapporo (JP); and NISSAN CHEMICAL CORPORATION, Sappporo (JP)
Appl. No. 17/634,073
Filed by NIPPON HIGH STRENGTH CONCRETE CO., LTD., Sapporo (JP); and NISSAN CHEMICAL CORPORATION, Tokyo (JP)
PCT Filed Jul. 7, 2020, PCT No. PCT/JP2020/026516 § 371(c)(1), (2) Date Feb. 9, 2022, PCT Pub. No. WO2021/039133, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 2019-152449 (JP), filed on Aug. 23, 2019.
Prior Publication US 2022/0348499 A1, Nov. 3, 2022
Int. Cl. C04B 22/08 (2006.01); C04B 28/02 (2006.01); C04B 111/26 (2006.01); C04B 111/70 (2006.01); C04B 111/76 (2006.01)

CPC C04B 22/085 (2013.01) [C04B 28/02 (2013.01); C04B 2111/26 (2013.01); C04B 2111/70 (2013.01); C04B 2111/76 (2013.01)]

2 Claims

1. An installation method of a cold weather PC cement grout material containing cement, water and an admixture, wherein lithium nitrite is added to said cold weather PC cement grout material, and the weight ratio of said lithium nitrite to said cement is in the range of 3 to 10% by weight, and the compressive strength at 28 days is 30N/mm²or more, the cold weather PC cement grout material installation method being characterized in that curing and heating is performed such that an installation environment in places to install said cold weather PC cement grout material is kept at a temperature of −5° C. or above when an installation environment where the ambient temperature is lower than −5° C. is reached.