Field Tests of Cement
- Date
of Manufacturing: As
the strength of cement reduces with age, the date of manufacturing of
cement bags should be checked.
- Cement
Color: The
color of cement should be uniform. It should be typical cement color i.e.
gray color with a light greenish shade.
- Whether
Hard Lumps are Formed: Cement should
be free from hard lumps. Such lumps are formed by the absorption of
moisture from the atmosphere.
- 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.
- Smoothness
Test: When
cement is touched or rubbed in between fingers, it should give a smooth
feeling. If it felt rough, it indicates adulteration with sand.
- Water
Sinking Test: If
a small quantity of cement is thrown into the water, it should float some
time before finally sinking.
- The
smell of Cement Paste: A
thin paste of cement with water should feel sticky between the fingers. If
the cement contains too much-pounded clay and silt as an adulterant, the
paste will give an earthy smell.
- Glass
Plate Test: A
thick paste of cement with water is made on a piece of a glass plate and
it is kept under water for 24 hours. It should set and not crack.
- Block Test: A 25mm × 25mm × 200mm (1”×1”×8”) block of cement with water is made. The block is then immersed in water for three days. After removing, it is supported 150mm apart and a weight of 15kg uniformly placed over it. If it shows no sign of failure the cement is good.
Thank You.................😍😍😍
0 Comments