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YouTubeWeTech Academy | Engineering & Science Explained
Concrete Grades Explained (M20 to M80) | Civil Engineering Basics
What do concrete grades like M20, M25, M30, or M80 really mean on site? In this quick civil engineering tutorial, we break down: What “M” stands for in concrete mix design. Why M20 = 20 N/mm² compressive strength (after 28 days). How grades differ: M20–25 → residential, M30–40 → commercial, M50+ → bridges & high-rise construction ...
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