How to Calculate AAC Block Manufacturing Cost Per Cubic Meter
Setting up an Autoclaved Aerated Concrete unit requires rigorous calculation of capital expenditure (CAPEX) and operational expenses (OPEX). This interactive cost sheet runs on Mr. Balasaheb’s audited Excel models matching the standard recipe parameters of 100 kg Cement per 1 Cubic Meter (CuM) of aerated concrete.
Raw Material Mix Math
Calculates dry weight proportions: Fly Ash (approx. 430 kg/CuM), Cement (100 kg/CuM), Active Lime (80-90 kg/CuM), Gypsum (20 kg/CuM), and Aluminum Powder (0.75 kg/CuM) based on density targets.
Thermodynamic Steam Energy
Estimates coal/wood fuel consumption. Autoclave steam curing consumes roughly 0.25 to 0.30 Tons of saturated steam per CuM of concrete at 12 Bar working pressure.
| Raw Material Spec | Dosing Qty | Rate (₹) | Cost (₹/CuM) |
|---|---|---|---|
| Fly Ash | 896 | ||
| Cement | 450 | ||
| Gypsum | 42.5 | ||
| Quick Lime Powder | 262.5 | ||
| Aluminum Powder | 135 | ||
| Soluble Oil | 17.5 | ||
| Demolding Oil | 30 | ||
| Return Slurry (800/3000 Rate) | 0.267 | 0 | |
| Raw Material Cost Per Mold | Weight sum: | 696 kg | ₹1834 |
| Raw Material Cost Per CuM | Vol divisor: 1.14 | 610.53 kg | ₹1609 |
| Steam Curing Parameter | Input / Constant | Output |
|---|---|---|
| Steam Consumption (kg/m3) | - | |
| Latent Heat of Steam (kcal/kg) | 640 | - |
| Heat Required (kcal) | 128000 kcal | - |
| Boiler Efficiency (%) | - | |
| Calorific Value of Coal (kcal/kg) | 4000 | - |
| Coal Consumption (kg/m3) | 37.65 kg | - |
| Coal Cost (₹/kg) | - | |
| Cost of Coal (₹/m3) | - | ₹225.88 |
| Water cost per CuM (₹0.02/Liter rate) | - | ₹4.00 |
| Water Treatment & Boiler Maintenance Cost | - | |
| Steam Cost per CuM (unrounded) | Sum: | ₹249.88 |
| Saturated Steam Cost per CuM (rounded) | Rounded: | ₹250 |
| Power Parameters | Input / Constant | Output |
|---|---|---|
| Total Operating Load (HP) | - | |
| Unit per Hour (connected load) | - | 27.975 Units |
| Unit Consumption per 8-Hour Shift | - | 223.8 Units |
| Total Units Consumed per CuM produced | - | 2.238 Units |
| Per Unit Rate (Electricity Tariff) | ₹/Unit | |
| Electricity Cost per CuM | Total Cost: | ₹22.38 |
| Expense Category | Cost / Month (₹) | Cost / CuM (₹) |
|---|---|---|
| Staff Salary + Sales & Marketing | ₹25.60 | |
| Labor welfare, bonus | ₹2.00 | |
| Bank Interest (Monthly capital cost) | ₹12.80 | |
| Land Rent | ₹12.80 | |
| Factory Overheads (Monthly) | ₹12.00 | |
| Total Miscellaneous Cost | Sum: ₹ 1,63,000 | ₹65 |
Feasibility Disclaimer: The calculated results are derived from ideal operating conditions under standard formulations. Local fluctuations in raw material pricing, labor productivity, actual boiler thermodynamic performance, and electrical power tariff structures will influence real world results.
Autoclaved Aerated Concrete Plant Feasibility FAQs
What is the typical recipe for AAC Block production?
AAC blocks utilize a precise mix of Fly Ash or Silica Sand as the primary silicate agent, combined with standard OPC 53 Cement, Quick Lime powder, and Gypsum. Aluminum powder is added at a ratio of 0.45% to react with the alkaline hydroxides, creating microscopic hydrogen gas bubbles that yield the cellular bubble structure.
How does steam curing affect overall cost structure?
Steam autoclaving is energy intensive, requiring high pressure and temperatures to build crystalline Tobermorite. Boiler thermodynamic efficiency directly impacts coal consumption. By optimizing boiler feed water treatment and maintaining high efficiency (above 80%), fuel coal expenditures can be minimized significantly.
