National Aircon Hvac Design Engineer Interview Questions and Answers

M15 grade ratio is the mix ratio of concrete used in construction projects.

• M15 grade concrete has a mix ratio of 1:2:4 (1 part cement, 2 parts sand, 4 parts aggregate)

• It is commonly used for non-structural works like flooring, pathways, etc.

• The strength of M15 grade concrete is 15 MPa after 28 days of curing

Minimum grade of concrete is M10, which is used for plain cement concrete works.

• Minimum grade of concrete is M10 as per IS 456:2000.

• M10 grade concrete has a compressive strength of 10 N/mm^2 after 28 days of curing.

• It is commonly used for plain cement concrete works like levelling course, bedding for footing, etc.