Quality test on cement at construction site is also called field test on cement.Sometimes it may be required to perform cement test at construction site at a very short period of time to check quality of cement based on colour,smoothness,feel etc.These test does not provided accurate results but it provides some basic ideas regarding the quality of cement.
Test on Cement at Construction Site
- Date of manufacturing test
- Color test
- Smoothness test
- Temperature test
- Float test
- Presence of lumps
- Smell test
- Setting test
- Strength test
1. Date of Manufacturing Test
As the strength of cement reduces with age,the date of manufacturing of cement bags should be checked.
2. Color Test
The color of cement should be uniform.It should be grey in color with a light greenish shades.
3. Smoothness Test
When cement is rubbed or touched in between fingers it should give a smooth feeling.If it felt rough it indicates adulteration with sand.
4. Temperature Test
If hand is inserted in a bag of cement or heap of cement, it should feel cool and not warm.
5. Float Test
If a small quantity of cement is throw in water, the particles should float for some time before it sinks.
6. Presence of Lumps
The cement should be free from lumps. Such lumps are formed by the absorption of moisture from the atmosphere.If any cement bags containing such lumps they are rejected.
7. Smell Test
Take a pinch of cement and smell it.If the cement contains clay and silt as an adulterant the paste will give an earthy smell.
8. Setting Test
A thick paste of cement with water is made on a piece of glass plate and it is kept under water for 24hr.It should set and not crack.
9. Strength Test
A block of cement 25mm x 25mm x 200mm long is prepared and it is immersed for 7 days in water.It is then placed on supports 15000 mm apart and it is loaded with a weight 340 N.The block should not show any sign of failure.
No comments:
Post a Comment
If you have any doubts, Please let me know.