M20 concrete is a widely used mix in construction, known for its moderate strength and versatility. It follows a specific ratio of materials, typically 1:1.5:3 (cement: sand: aggregates) by volume. This ratio ensures a compressive strength of 20 MPa (20 N/mm²) after 28 days of curing, making it suitable for various structural applications like footings, columns, beams, and slabs.