Soundness of cement is tested by-
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A.
Izod apparatus
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B.
Vicat apparatus
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C.
Le-chatelier apparatus
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D.
Hopper apparatus
Correct Answer:
C. Le-chatelier apparatus
Explanation:
The correct answer is Le-Chatelier apparatus.
The soundness of cement refers to its ability to retain its volume after hardening without undergoing excessive expansion, which could lead to cracking and structural failure. This property is primarily tested using the Le-Chatelier method to detect unsoundness caused by an excess of free lime.
The Le-Chatelier apparatus consists of a small, split brass cylinder 30 mm in diameter and 30 mm high, with two 165 mm long indicator arms attached to either side of the split. During the test, a cement paste is placed in the mould and submerged in water. The expansion is determined by measuring the increase in the distance between the indicator points after the assembly has been boiled. For most types of Portland cement, the expansion should not exceed 10 mm. While this method is effective for detecting free lime, the autoclave test is typically used to detect unsoundness caused by magnesia.
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