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If L1=Measurement taken after 24 hours of immersion in water at a temp. of 27 ± 20^oC and L2=Measurement taken after 3 hours of immersion in water at boiling temperature. Then what is soundness of cement?

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If L1=Measurement taken after 24 hours of immersion in water at a temp. of 27 ± 20^oC and L2=Measurement taken after 3 hours of immersion in water at boiling temperature. Then what is soundness of cement?

(a) L1+L2

(b) L1/L2

(c) L1-L2

(d) L1*L2

I had been asked this question in a national level competition.

Question is taken from Testing of Cement topic in section Types of Cement and Testing of Cement of Concrete Technology

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The correct choice is (c) L1-L2

For explanation: L1-L2 is the formula to calculate the soundness of cement. First take the reading after immersion in water then measure it after 3 hours of immersion in boiling water.

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