The minimum value of Modulus of Rupture for Class A lime should be :
- A1·15 N/mm²
- B1·05 N/mm²Correct
- C1·50 N/mm²
- D1·25 N/mm²
Solution
Concept
Strength requirements of building limes (IS 712)
Step-by-step solution
1. IS 712 classifies building limes into classes A to F. 2. Class A is eminently hydraulic lime used for structural works. 3. Its minimum modulus of rupture is taken as 1.05 N/mm².
Explanation
Class A lime is the strongest class of building lime and is required to meet specified compressive and flexural strengths at 28 days.
Why the other options are wrong
The other values are not the specified minimum for the modulus of rupture of Class A lime.
Shortcut
Remember the table of IS 712 for lime classes.
Correct answer: B) 1·05 N/mm²