SSC JE 2023 Exam-BMC: What is Le – Chatelier Test?

Do you know about Le – Chatelier Test? Let’s discuss everything you need to know about this test in a fun and easy way. Read on to know how to tackle any question related to Le – Chatelier Test. And don’t forget to take a Free Mock Test to check your knowledge and skills on this test.

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What is Le – Chatelier Test?

The test is performed to find the soundness of cement can be defined as its ability to resist volume change after it gets hardened. In cement, unsoundness is caused due to excess lime, magnesia, and silica.

Procedure to perform Le – chatelier test

1. Before conducting the test, lightly apply oil to both the Le-Chatelier mould and the glass plates.

• To prepare the cement paste, cement is gauged with 0.78 times the amount of water needed to achieve a paste of standard consistency.

• Carefully fill the Le-Chatelier mould with the cement paste, ensuring that the edges of the mould are gently kept together during this step.

• Cover the mould with another glass plate and place a small weight on top of the cover plate.

• Immediately submerge the entire assembly in water at a temperature of 27±2°C and keep it submerged for 24 hours.

• After 24 hours, take out the assembly from the water at 27±2°C and measure the distance between the indicator points, which we’ll call measurement A.

• Submerge the assembly in water again at 27±2°C and slowly bring the water to a boil within 25 to 30 minutes. Maintain a boiling temperature for 3 hours, with the assembly still immersed in water throughout this process.

• Remove the mould from the boiling water and allow it to cool back down to 27±2°C.

• Once the mould has cooled, measure the distance between the indicator points again, and this measurement will be referred to as measurement B.

Calculation:

Expansion= B- A

Where, A = The measurement taken after 24hours of immersion in water at 27 ± 2°C

B = The measurement taken after 3hours of immersion in water at boiling temperature

Conclusion:

The soundness of Ordinary Portland Cement (OPC), Low heat cement, high alumina cement, and rapid-hardening cement should not be more than 10mm. The Le-Chatelier’s Method is utilized to identify the excess lime in the cement, which is responsible for cement expansion.

45.        The diameter of a cylinder in the Le-Chatelier apparatus for conducting the soundness test of cement is:

(a) 30

(b) 22

(c) 35

(d) 40

ANS: (a)

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