According to Le Chatelier Method for testing soundness of cement the ...
The value of soundness of cement obtained for Ordinary Portland Cement (OPC), Low heat cement, high alumina cement and rapid hardening cement must not exceed 10mm. The Le-chatlier's Method helps us to determine the lime present in the cement in excess.
Hence, the correct option is (C)
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According to Le Chatelier Method for testing soundness of cement the ...
Le Chatelier Method for Testing Soundness of Cement
The soundness of cement is the ability of cement to retain its volume after it gets hardened. Le Chatelier Method is used to determine the soundness of cement. This method measures the volume changes of cement after it gets hardened.
Limit for Expansion of Cement
The unaerated ordinary rapid hardening and low heat Portland cement should not have an expansion of more than 10 mm as per Le Chatelier Method for testing soundness of cement.
Explanation
- The Le Chatelier Method involves the use of a special apparatus called Le Chatelier apparatus.
- The apparatus consists of a small split cylinder which is made of brass.
- The cylinder has an internal diameter of 30 mm and a length of 30 mm.
- The cylinder is placed on a glass plate and is filled with cement paste.
- The cement paste is then compacted by using a tamping rod.
- Then, the apparatus is immersed in water and boiled for 3 hours.
- After boiling, the apparatus is cooled down.
- Then, the distance between the two ends of the split cylinder is measured.
- This distance is the original length of the cement paste.
- Then, the apparatus is again placed in water and boiled for 3 hours.
- After boiling, the apparatus is cooled down.
- Then, the distance between the two ends of the split cylinder is again measured.
- If the expansion of cement is more than 10 mm, then the cement is not considered sound.
Conclusion
In conclusion, according to Le Chatelier Method for testing soundness of cement, the unaerated ordinary rapid hardening and low heat Portland cement should not have an expansion of more than 10 mm. This is because an excessive expansion can lead to cracking and failure of the concrete structure.