AIM
To determine the specific gravity of given sample of hydraulic
cement.
APPARATUS
Physical balance, specific gravity bottle of
50ml capacity, clean kerosene.
THEORY
Specific gravity is defined as the ratio between
weight of a given volume of material and weight of an equal volume of water. To determine the specific
gravity of cement, kerosene is used which does not react with cement. of material and weight of an equal volume of water. To determine the specific
gravity of cement, kerosene is used which does not react with cement.
1. Clean and dry the specific gravity bottle and weigh it with the stopper (W1).
2. Fill the specific gravity bottle with cement sample at least half of the bottle and weigh with stopper (W2).
3. Fill the specific gravity bottle containing the cement, with kerosene (free of water) placing the stopper and weigh it (W3).
4. While doing the above do not allow any air bubbles to remain in the specific gravity
bottle.
5. After weighing the bottle, the bottle shall be cleaned and dried again.
6. Then fill it with fresh kerosene and weigh it with stopper (W4).
7. Remove the kerosene from the bottle and fill it with full of water and weigh it with stopper (W5).
8. All the above weighing should be done at the room temperature of 27c + 10c.
OBSERVATIONS:
|
Description of item |
Trial 1 |
Trial2 |
Trail3 |
|
Weight
of empty bottle W1 g |
|||
|
Weight
of bottle + Cement W2 g |
|||
|
Weight
of bottle + Cement + Kerosene W3 g |
|||
|
Weight
of bottle + Full Kerosene W4 g |
|||
|
Weight
of bottle + Full Water W5 g |
|||
|
Specific
gravity of Kerosene Sk = W4 - W1 / W5 - W1 |
PRECAUTION:
1. Only kerosene which is free of water shall be used.
2. At time of weighing the temperature of the apparatus will not be allowed to exceed the
specified temperature.
3. All air bubbles shall be eliminated in filling the apparatus and inserting the stopper.
4. Weighing shall be done quickly after filling the apparatus and shall be accurate to 0.1 mg.
5. Precautions shall be taken to prevent expansion and overflow of the contents resulting from
the heat of the hand when wiping the surface of the apparatus.
RESULT
Average specific gravity of
given sample of cement =
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Initial and Final setting of Cement
Compressive strength of Cement Sample
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Grain Size distribution of fine aggregate
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Crushing Value of aggregate
Impact Value of aggregate
Compressive strength of Concrete Cube
Fineness of cement
Compressive strength of cement
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Soundness of cement
Fineness Modulus of fine and Coarse Aggregrate
Specific Gravity, Void ratio, porosityand Bulk density of fine and Coarse aggregrate
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Slump test-Workability test
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