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Common Mix Ratios:
M15 = 1:2:4 (Cement: Sand: Gravel)
M20 = 1:1.5:3 (Cement: Sand: Gravel)
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The concrete mix ratio refers to the proportion of cement, sand, and gravel in concrete. Common standard ratios include M15 (1:2:4) and M20 (1:1.5:3), where the numbers represent the volume ratio of cement:sand:gravel.
The calculator uses the following steps:
1. Calculate volume: Area (sq ft) × Thickness (inches converted to feet)
2. Convert volume to cubic meters
3. Apply mix ratio proportions
4. Calculate material weights based on standard densities
Standard Densities:
Details: Using the proper mix ratio ensures the concrete has the desired strength, durability, and workability for your project. M15 is suitable for general purposes while M20 provides higher strength.
Tips: Measure your area accurately in square feet. For thickness, typical slabs use 4-6 inches. Select the appropriate mix ratio for your project requirements.
Q1: What's the difference between M15 and M20 concrete?
A: M15 has a lower cement content (1:2:4 ratio) and is used for general construction, while M20 (1:1.5:3) has higher strength for more demanding applications.
Q2: How much water should I add?
A: Typically 0.4-0.6 times the weight of cement, but this depends on desired consistency and weather conditions.
Q3: Can I use this for large projects?
A: This calculator is for estimation. Large projects should consult with a structural engineer for precise requirements.
Q4: How accurate are these calculations?
A: They provide good estimates but actual needs may vary based on material quality, compaction, and site conditions.
Q5: What if my materials have different densities?
A: The calculator uses standard densities. For significantly different materials, consult with your supplier for accurate conversions.