SOUNDNESS TEST OF CEMENT

SOUNDNESS TEST OF CEMENT

AIM:

To identify how much volumetric expansion the cement sample goes through once it is set.

APPARATUS REQUIRED:

1. Chatelier test equipment

2. Metal tray

3. Weighing balance

4. Measuring cylinder

5. Thermometer



SAMPLE:

The cement absorbed must be fine-ground material to which the addition of sufficient amount of water can harden both in water and in the air due to the chemistry of reaction of its materials with water and to have the capacity of binding together the right materials. Oxygenated (Reference IS: 3535 - 1986)

PROCEDURE:

1. Before commencing setting time test, do the consistency test to obtain the water required to give the paste normal consistency (P).

2. Prepare a paste by adding 0.78 times the water required to give a paste of standard consistency (i.e. 0.78P) as per IS 4031 (Part 4)-1988.

3. Lightly oil the Le-chatelier mould and place it on a lightly oiled glass sheet.

4. Fill the mould with the prepared cement paste. In the process of filling the mould keep the edge of the mould gently together.

5. Cover the mould with another piece of lightly oiled glass sheet and place a small weight on this covering glass sheet.

6. Immediately submerge the whole assembly in water at a temperature of 27 ± 20 C and keep there for 24 hours.

7. Remove the whole assembly from water bath and measure the distance separating the indicator points to the nearest 0.5 mm (L1).

8. Again submerge the whole assembly in water bath and bring the temperature of water bath to boiling temperature in 25 to 30 minutes. Keep it at boiling temperature for a period of 3 hours.

9. After completion of 3 hours removes the mould from the water allow it to cool.

10. Measure the distance between the two indicator points to the nearest 0.5 mm (L2).

CALCULATION:

Soundness/expansion of cement = L2-L1 

Where,

L1=Measurement taken after 24 hours of immersion in water at a temp of 27 ± 20 C

L2=Measurement taken after 3 hours of immersion in water at boiling temperature.

Calculate the mean of two values to the nearest 0.5 mm.

NOTE:

Acceptable Value – Soundness / Expansion of cement should not be more than 10mm

REFERENCE:

IS: 4031 (PART 3) – 1988

 

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