1. What is M20 Concrete Mix Ratio?

The M20 concrete mix ratio (1:1.5:3) is a standard proportion of cement, sand, and gravel used for constructing driveways and other medium-strength concrete applications. The numbers represent the volume ratio of cement to sand to gravel.

2. How Does the Calculator Work?

The calculator uses the selected mix ratio to determine material quantities:

Where:

• Total Volume — The concrete volume needed (m³)
• Material Ratio — The part for each material (e.g., 1 for cement in M20)
• Total Ratio Parts — Sum of all ratio parts (e.g., 5.5 for M20)

3. Importance of Proper Mix Ratios

Details: Using correct mix ratios ensures concrete has the required strength, durability, and workability for its intended application. Incorrect ratios can lead to structural failures or wasted materials.

4. Using the Calculator

Tips: Enter the total volume of concrete needed in cubic meters and select the appropriate mix ratio for your project. The calculator will show the required amounts of each material.

5. Frequently Asked Questions (FAQ)

Q1: Why is M20 ratio recommended for driveways?
A: M20 provides the right balance of strength (20 MPa) and workability needed for driveway applications that must withstand vehicle loads.

Q2: How do I measure materials on site?
A: Use standard measuring boxes or buckets to maintain the volume ratios. Always measure by volume, not weight.

Q3: Can I adjust the water content?
A: Water should be added to achieve workability (slump test) but excess water weakens the concrete. Typically 0.5 water/cement ratio is used.

Q4: What if I need stronger concrete?
A: For heavier loads, use M25 (1:1:2) mix which provides 25 MPa compressive strength.

Q5: How much extra should I calculate for wastage?
A: Add 10-15% extra materials to account for spillage, uneven mixing, and other losses.