Does cement have a use-by date?
: Cement quality is affected by exposure to moisture and air. Cement in opened bags will deteriorate quickly, as will cement in bags that are exposed to wet weather and not used immediately. Cement should be used promptly or stored undercover in as dry an area as possible and off the ground. It is considered that under normal storage conditions cement is fully usable for up to six months from the date of manufacture, which is printed on the bag. If cement is visibly affected, with a large number of hard lumps, it should be re-tested or not used.
