Armstrong S-240 2 part epoxy adhesive. 

SUBFLOORS All grade levels of concrete, existing resilient floors, ceramic terrazzo, marble and polymeric poured floors; suspended wood
APPLICATION METHOD Trowel
SPREAD RATE 170-190 sq. ft./gal. (15-17 sq. m)
OPEN TIME Approximately 10-20 minutes (set-in-wet)
WORKING TIME 1 hour - NOTE: Working times vary based on job conditions, subfloors, temperature and humidity.