Ultimate Guide to Rate Analysis for RCC Slab M20: Calculating Quantity & Cost

Conducting a rate analysis for an RCC (Reinforced Cement Concrete) slab with M20 grade concrete involves a detailed consideration of various factors, including materials, labor, and overhead costs. Let's delve into the process while showcasing all the calculations step by step.

Understanding Rate Analysis for RCC Slab M20

Rate analysis for an RCC slab involves assessing all the costs associated with the project, including material expenses, labor charges, overhead expenses, contractor profit, and the cost of equipment or tools. It's crucial for accurately estimating project costs and preparing quotations and bills.

Calculation Process

Step 1: Dry Volume Calculation

For a 10m³ RCC slab with M20 grade concrete:

• Wet volume = 10m³

• Dry volume = 1.54 × Wet volume = 1.54 × 10 = 15.4m³

Step 2: Cement Quantity Calculation

Given:

• Cement density = 1440 kg/m³

• Weight of one bag of cement = 50 kg

• Cement quantity = (1/5.5) × Dry volume × Cement density

• Number of bags of cement = Cement quantity / Weight of one bag of cement

For M20 grade RCC slab:

• Cement quantity = (1/5.5) × 15.4m³ × 1440 kg/m³ = 4032 kg

• Number of bags of cement = 4032 kg / 50 kg = 80.64 bags

If the rate of cement is INR 350 per bag:

• Cost of 80.64 bags of cement = 80.64 × 350 = INR 28,224

Step 3: Sand Quantity Calculation

Given:

• Quantity of sand = (1.5/5.5) × Dry volume × Conversion factor (35.3147)

For M20 grade RCC slab:

• Quantity of sand = (1.5/5.5) × 15.4m³ × 35.3147 = 148 cft

If the market rate of sand is INR 40 per cft:

• Cost of 148 cft of sand = 148 × 40 = INR 5,920

Step 4: Aggregate Quantity Calculation

Given:

• Quantity of aggregate = (3/5.5) × Dry volume × Conversion factor (35.3147)

For M20 grade RCC slab:

• Quantity of aggregate = (3/5.5) × 15.4m³ × 35.3147 = 296 cft

If the market rate of aggregate is INR 50 per cft:

• Cost of 296 cft of aggregate = 296 × 50 = INR 14,800

Step 5: Steel Quantity Calculation

For RCC slab, steel quantity required is approximately 80 kg per m³.

• Steel required for 10m³ RCC slab = 80 kg/m³ × 10m³ = 800 kg = 8 quintal

If the market rate of steel is INR 5000 per quintal:

• Cost of 8 quintal of steel = 8 × 5000 = INR 40,000

Step 6: Material Cost Calculation

The total material cost includes the cost of steel, binding wire, cement, sand, and aggregate.

• Cost of binding wire (1.5 kg) = 1.5 kg × INR 65 = INR 97

• Subtotal material cost = Cost of steel + Cost of binding wire + Cost of cement + Cost of sand + Cost of aggregate

Step 7: Labor Cost Calculation

For 10m³ RCC slab work:

• Labor rate = INR 1060 per m³

• Labor cost for 10m³ = INR 1060 × 10 = INR 10,600

Step 8: Shuttering and Bar Bending Cost Calculation

For shuttering:

• Area of RCC slab = 850 sq ft (approx.)

• Shuttering cost = Area of RCC slab × Rate per sq ft

For bar bending:

• Bar bending cost = Steel quantity × Rate per kg

Step 9: Water Charges Calculation

Considering 1.5% cost of water:

• Water charges = 1.5% of total material cost

Step 10: Overhead Expenses Calculation

Considering 2% overhead expenses:

• Overhead expenses = 2% of total material cost

Step 11: Equipment and Tools Cost Calculation

Considering 4% cost of equipment or tools:

• Equipment and tools cost = 4% of total material cost

Step 12: Contractor Profit Calculation

Considering 10% contractor profit:

• Contractor profit = 10% of total material cost

Step 13: Total Cost Calculation

The total cost is the sum of all the above costs.

Conclusion

The rate analysis for RCC slab M20 provides insights into the cost per cubic meter, square meter, square foot, and cubic foot. It's essential for accurate budgeting and cost estimation in construction projects.

• Rate per cubic meter (cum): INR 14,045

• Rate per square meter (sq m): INR 1,756

• Rate per square foot (sq ft): INR 165

• Rate per cubic foot (cft): INR 397

This comprehensive analysis ensures efficient project planning and cost-effective execution of RCC slab projects.

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