AIM
To determine the soundness of the given sample of
cement by "Le Chatelier" Method.
Le Chatelier apparatus
conforming to IS 5514-1969, Balance, Weights, Water bath.
THEORY
PROCEDURE:
1. Place the lightly oiled mould on a lightly oiled glass sheet and fill it with cement paste formed by gauging cement with 0.78 times the water required to give a paste of standard consistency.
2. The paste shall be gauged in the manner and under the conditions prescribed in determination of consistency of standard cement paste, taking care to keep the edges of the mould gently together
4. Measure the distance separating the indicator points.
THEORY
It is essential that the
cement concrete shall not undergo appreciable change in volume after setting. This is ensured by limiting the quantities of free
lime, magnesia and sulphates in cement which are the causes of the change in volume known as
unsoundness.
Unsoundness in cement does not come to surface for a considerable period of
time. This test is designed to accelerate the slaking process by the application of heat and
discovering the defects in a short time. Unsoundness produces cracks, distortion and disintegration
there by giving passage to water and atmospheric gases which may have injurious effects on
concrete and reinforcement.
The apparatus for conducting the test consists of small split cylinder of spring brass or other suitable metal of 0.5mm thickness forming a mould 30 mm internal diameter and 30mm high. On either side of the split mould are attached to indicators with pointed ends, the distance fromthese ends to the center of the cylinder being 165 mm. The mould shall be kept in good condition with the jaws not more than 50mm apart.
The apparatus for conducting the test consists of small split cylinder of spring brass or other suitable metal of 0.5mm thickness forming a mould 30 mm internal diameter and 30mm high. On either side of the split mould are attached to indicators with pointed ends, the distance fromthese ends to the center of the cylinder being 165 mm. The mould shall be kept in good condition with the jaws not more than 50mm apart.
PROCEDURE:
1. Place the lightly oiled mould on a lightly oiled glass sheet and fill it with cement paste formed by gauging cement with 0.78 times the water required to give a paste of standard consistency.
2. The paste shall be gauged in the manner and under the conditions prescribed in determination of consistency of standard cement paste, taking care to keep the edges of the mould gently together
3. While this operation is being performed cover the mould with another piece
of glass sheet, place a small weight on this covering glass sheet and immediately
submerge the whole assembly in water at a temperature of 27°- 2°C and keep there for 24 hours.
4. Measure the distance separating the indicator points.
5. Submerge the moulds again in water at the temperature prescribed above.
6. Bring the water to boiling, with the mould kept submerged for 25 to 30
minutes, and keep it boiling for three hours.
7. Remove the mould from the water allow it to cool and measure the distance
between the indicator points.
8. The difference between these two measurements represents the expansion of
the cement.
9. For good quality cement this expansion should not be more than 10mm.
OBSERVATIONS:
Initial distance between the indicator points in mm =
Final distance between the indicator points in mm =
Expansion in mm = final length - initial length =
Initial distance between the indicator points in mm =
Final distance between the indicator points in mm =
Expansion in mm = final length - initial length =
RESULT
Expansion in mm
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Initial and Final setting of Cement
Compressive strength of Cement Sample
Specific Gravity of fine aggregate
Grain Size distribution of fine aggregate
Grain Size distribution of coarse aggregate
Crushing Value of aggregate
Impact Value of aggregate
Compressive strength of Concrete Cube
Fineness of cement
Compressive strength of cement
Specific Gravity of cement
Soundness of cement
Fineness Modulus of fine and Coarse Aggregrate
Specific Gravity, Void ratio, porosityand Bulk density of fine and Coarse aggregrate
Bulking of Sand
Slump test-Workability test
Compaction factor test- Workability test
Flow table test- Workability test
Water absorption test of aggregrate
Initial and Final setting of Cement
Compressive strength of Cement Sample
Specific Gravity of fine aggregate
Grain Size distribution of fine aggregate
Grain Size distribution of coarse aggregate
Crushing Value of aggregate
Impact Value of aggregate
Compressive strength of Concrete Cube
Fineness of cement
Compressive strength of cement
Specific Gravity of cement
Soundness of cement
Fineness Modulus of fine and Coarse Aggregrate
Specific Gravity, Void ratio, porosityand Bulk density of fine and Coarse aggregrate
Bulking of Sand
Slump test-Workability test
Compaction factor test- Workability test
Flow table test- Workability test
Water absorption test of aggregrate
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