1. What Are Concrete Mix Ratios?

Concrete mix ratios are the proportions of cement, sand, and aggregate (gravel) used in concrete preparation. Standard ratios ensure the concrete achieves the desired strength and workability.

2. How Does the Calculator Work?

The calculator uses standard concrete mix ratios:

Calculation Steps:

1. Determine total parts in the selected ratio
2. Calculate dry volume (wet volume + 54% for voids)
3. Divide dry volume by total parts to get quantity per part
4. Multiply by individual ratios to get material quantities

3. Importance of Proper Mix Ratios

Details: Correct ratios ensure concrete has adequate strength, durability, and workability. Too much cement makes concrete brittle, while too little weakens it.

4. Using the Calculator

Tips: Select the concrete grade based on required strength (M15 for general purposes, M20 for stronger applications). Enter the volume needed in cubic meters.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between M15 and M20 concrete?
A: M15 has a compressive strength of 15 MPa, while M20 has 20 MPa. M20 uses more cement for higher strength applications.

Q2: Why add 54% to wet volume?
A: Dry materials have voids between particles. The extra volume accounts for these voids when materials are mixed with water.

Q3: How many 50kg cement bags per m³?
A: Approximately 7.5 bags for M15, 8.1 bags for M20 (varies slightly based on mix design).

Q4: Can I use this for large projects?
A: For large projects, consult a structural engineer for precise mix design based on materials and requirements.

Q5: What about water content?
A: Water-cement ratio (typically 0.4-0.6) is crucial but not calculated here. Add water gradually until workable consistency is achieved.