Field Tests:

The subsequent are the field tests on cement:

(a) The color of the cement should be uniform. It should be grey color with a light greenish shade.

(b) The cement should be free from any hard lumps. Such lumps are formed by the absorption of moisture from the atmosphere. Any bag of cement containing such lumps should be rejected.

(c) The cement should feel smooth when touched or rubbed in between fingers. If it is felt rough, it indicates adulteration with sand.

(d) If hand is inserted within a bag of cement or heap of cement, it should feel cool and not warm.

(e) If a little quantity of cement is thrown in a bucket of water, the particles should float for sometime before it sinks.

(f) A thick paste of cement along with water is made on a piece of glass plate and it is kept under water for 24 hours. That should set and not crack.

(g) A block of cement 25 mm × 25 mm and 200 mm long is prepared and it is immersed for 7 days in water. It is then placed on supports 15cm apart and it is loaded with a weight of about 34 kg. The block should not show signs of failure.

(h) The briquettes of a lean mortar (1: 6) are made. The size of briquette may be about 75 mm × 25 mm × 12 mm. They are immersed in water for a period of 3 days. If cement is of sound quality such briquettes will not be broken easily.