1 2 4 Concrete Mix Calculator

1:2:4 Mix Ratio Formula:

\[ \text{Cement} = \frac{\text{Volume}}{7} \] \[ \text{Sand} = \frac{2}{7} \times \text{Volume} \] \[ \text{Aggregate} = \frac{4}{7} \times \text{Volume} \]

Cement Required:

Sand Required:

Aggregate Required:

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1. What is 1:2:4 Concrete Mix?

The 1:2:4 concrete mix ratio refers to the proportion of cement, sand, and aggregate (coarse aggregate) by volume. This standard mix is commonly used for general construction purposes like slabs, beams, columns, and foundations.

2. How Does the Calculator Work?

The calculator uses the following formulas:

\[ \text{Cement} = \frac{\text{Total Volume}}{7} \] \[ \text{Sand} = \frac{2}{7} \times \text{Total Volume} \] \[ \text{Aggregate} = \frac{4}{7} \times \text{Total Volume} \]

Where:

1 represents the part of cement in the mix
2 represents the part of sand in the mix
4 represents the part of aggregate in the mix
7 is the sum of the mix ratio parts (1+2+4)

3. Importance of Proper Mix Ratios

Details: Using the correct mix ratio ensures the concrete has the right strength, workability, and durability for its intended purpose. The 1:2:4 ratio typically produces concrete with a compressive strength of about 20 MPa (3000 psi).

4. Using the Calculator

Tips: Enter the total volume of concrete needed in cubic feet. The calculator will automatically compute the required amounts of cement, sand, and aggregate based on the 1:2:4 ratio.

5. Frequently Asked Questions (FAQ)

Q1: Is this ratio by weight or volume?
A: The 1:2:4 ratio is by volume, not weight. Materials should be measured by volume for proper proportioning.

Q2: How much water should I add?
A: Water-cement ratio is typically 0.4-0.6. For 1 cubic foot of cement, use about 0.4-0.6 cubic feet of water.

Q3: What type of projects use 1:2:4 mix?
A: This mix is suitable for reinforced concrete works, foundations, slabs, and other general construction purposes.

Q4: How many bags of cement per cubic yard?
A: For 1 cubic yard (27 cubic feet) of 1:2:4 concrete, you'll need about 6.2 bags of cement (assuming 1 bag = 1 cubic foot).

Q5: Can I adjust the ratio for different strengths?
A: Yes, for higher strength use richer mixes like 1:1.5:3. For mass concrete, leaner mixes like 1:3:6 may be used.