RYOT4 ACC is a ready-to-use, Accelerating Concrete Admixture which accelerates initial setting time one to three times faster than normal mortar and concrete. USES: RYOT4 ACC is recommended for use during cool and cold weather to accelerate the set time and reduce the risk of frozen mortar and concrete mixes. However, RYOT4 ACC can be used any time you want to accelerate the set time to decrease turnaround time