Answer Posted / naushad bashir mir

M20 means itz an ordinary concrete.M refers to the mix and number (20) represents the characteristic compressive strength of concrete N/mm2 which means 20N/mm2 .And also one thing there is not any m200
Concrete had only 15 grades M10 M15 M20 M25 M30 M35 M40 M45 M50 M55 M60 M65 M70 M75 M80

What do you mean by bond? What are the different types of bonds?

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what values & beliefs have guided you in your career path

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