Field Tests of Cement : 1. Date of Manufacturing: As the strength of cement reduces with age, the date of manufacturing of cement bags should be checked. 2. Cement Color: The color of cement should be uniform. It should be typical cement color i.e. gray color with a light greenish shade. 3. Whether Hard Lumps are Formed: Cement should be free from hard lumps. Such lumps are formed by the absorption of moisture from the atmosphere. 4. Temperature Inside Cement Bag: If the hand is plunged into a bag of cement, it should be cool inside the cement bag. If hydration reaction takes place inside the bag, it will become warm.