Summary of Reddit Comments: "M20 Concrete"

M20 Concrete

• M20 Concrete is a type of concrete mix commonly used in structural concrete construction that has a design strength of 20 MPa.
• It is recommended to use M20 or better mixes for structural concrete, with a water-cement ratio for M20 typically ranging from .5 to .6.
• The 28-day strength of M20 Concrete is usually higher than the design strength due to manufacturers adding a safety factor.

Pros:

• Higher Strength: M20 Concrete is strong and suitable for structural projects.
• Reliable: The 28-day strength tends to be higher than the design strength.
• Versatile: Can be used for various types of structural construction projects.

Cons:

• Water-Cement Ratio: The ratio for M20 Concrete is relatively high, which may affect some applications.
• Laboratory Tests: Some users noted discrepancies between lab-cured specimens and concrete in place.
• Mix Design: Proper mix design is crucial for achieving the desired strength and performance.

Further Information:

• It is advised not to dose M20 Concrete by volume but rather focus on the water-cement ratio for optimal strength.
• The quality and strength of concrete are affected by factors such as water-cement ratio and air content.
• For structural-grade concrete, it is important to follow proper mix design procedures.