Self-Mix Metric Concrete Calculator with Moisture Correction
Self-Mix Metric Concrete Calculator with Moisture Correction.
This Self-Mixing Concrete Calculator helps you calculate the necessary quantities of cement, sand, gravel, and water for a concrete mix based on a specified volume in cubic metres, including moisture correction for aggregates. This is especially useful for ensuring the right mix when working onsite, accounting for the varying moisture content and absorption rates of materials.
Self-Mix from Volume Metric Calculator with Moisture
Calculator
- enter the mixing ratio for cement, sand, and gravel
- the water-to-cement ratio to control the workability
- enter the volume of concrete needed in cubic meters
- the absorption rate for the fine aggregates (sand)
- the moisture content of the sand
- the absorption rate for the course aggregates (gravel)
- the moisture content of the gravel
Results
- the total volume of concrete required
- the volume and weight of cement in cubic metres and kilograms
- the volume and weight of the sand in cubic metres and kilograms
- the volume and weight of gravelin cubic metres and kilograms
- the volume of water needed in cubic metres (calculated from the cement-to-water ratio)
- the weight of water in kilograms (1 litre of water equals 1 kilogram)
- the amount of water in litres (calculated as 1000 litres per cubic metre)
- the total weight of cement, sand, gravel, and water (the total mass of the concrete mix in kilograms)
- the weight of the fine aggregate (sand) adjusted by the amount of water it absorbs
- the weight of the coarse aggregate (gravel) in kilograms adjusted by the amount of water it absorbs
- the free water weight in kilograms and volume in litres
- adjusted water weight in kilograms and volume in litres
Example.
Mixing ratio (cement, sand, gravel):
Cement: 1, Sand: 2, Gravel: 4
This represents a 1:2:4 concrete mix.
Cement/water ratio:
0.5 (For this example, the water-to-cement ratio is 0.5, a typical ratio for medium-strength concrete)
Concrete volume (m³):
Five cubic meters (This is the total volume of concrete needed for the onsite mix)
Absorption of fine aggregate (sand absorption %):
1% (The absorption rate of sand is 1%)
Moisture content of fine aggregate (sand moisture %):
4% (The moisture content of sand, which is higher than its absorption rate, meaning the sand contains excess water)
Absorption of coarse aggregate (gravel absorption %):
0.8% (The absorption rate of gravel is 0.8%)
Moisture content of coarse aggregate (gravel moisture %):
2% (The moisture content of gravel, which is also higher than its absorption rate)
The total mix ratio is:
Cement (1) + Sand (2) + Gravel (4) = 7 parts
The required volume of concrete is five cubic meters. Each component's total material volume (before moisture correction) is calculated proportionally.
Volumes:
cement volume = (1/7) * 5 = 0.714 m³
sand volume = (2/7) * 5 = 1.429 m³
gravel volume = (4/7) * 5 = 2.857 m³
Convert these volumes to weights:
cement weight = 0.714 m³ * 1440 kg/m³ = 1028.2 kg
sand weight = 1.429 m³ * 1536.49 kg/m³ = 2194.98 kg
gravel weight = 2.857 m³ * 1589.98 kg/m³ = 4542.8 kg
Water required:
water = 0.5 * cement: 0.714 m³ * 0.5 = 0.357 m³
convert to kilograms: 0.357 m³ * 1000 = 357 kg
in litres: 375 litres
Moisture Correction:
Fine aggregates (sand):
absorbed water = (2194.98 kg * 1%) = 21.95 kg
free water = (2194.98 * (4% - 1%)) = 65.8494 kg
adjusted weight of the sand = 2194.98 + 21.95 = 2217 kg
(this excess moisture will be subtracted from the water requirement)
Course aggregates (gravel):
absorbed water = ( 4542.8 kg * 0.8%) = 36.3424 kg
free water = ( 4542.8 * (2% - 0.8%)) = 54.5 kg
adjusted weight of the gravel = 4542.8 + 36.3424 = 4579 kg
Adjusted water content:
free water from aggregates = 65.849 kg (sand) + 54.5kg (gravel) = 120.349 kg
Subtract this from the original water requirement:
adjusted water = 357 kg - 120.349 kg = 236.7 kg = 236.7 litres
Final material weights:
cement: 1028 kg
sand: 2217 kg
gravel: 4579 kg
water: 237 kg
This calculator provides essential moisture correction, ensuring the water content and aggregates are accurately adjusted based on their absorption and moisture levels. It's an effective tool for onsite self-mixing to create durable, high-quality concrete.
Concrete Self Mix Calculators