- Asked 2/22
- 2079 Bhadra · 8 marks
Rate analysis: 30 cm compacted gravel subgrade
Short answer
Compacted volume 0.3 m3/m2, loose factor 1.30, laid in two layers. For 100 m2, gravel 39 m3, unskilled 12 md, skilled 1.5 md, roller 1.5 hr. Rate = Rs 1,588.73 per m2, excluding VAT.
Prepare analysis of rates for providing, laying and consolidation of 30 cm thick compacted gravel for sub grade per square meter.
Basis
Rate for providing, laying and consolidating 30 cm thick compacted gravel in the sub-grade, per 100 m², laid and compacted in two layers of 15 cm (a single layer thicker than about 15 to 20 cm cannot be compacted properly). Assumptions (illustrative):
- Compacted volume = 100 x 0.30 = 30.0 m³; loose volume = compacted x 1.30 = 39.0 m³.
- Water for compaction = 12% of compacted volume = 3.60 m³.
- Labour 0.4 unskilled md and 0.05 skilled md per m³ of compacted gravel; roller 0.05 hr per m³.
Analysis (per 100 m²)
| Description | Qty | Unit | Rate (Rs) | Amount (Rs) |
|---|---|---|---|---|
| Gravel (sub-base grade), loose 39.00 m³ | 39 | m³ | 3,000.00 | 117,000.00 |
| Labour: spreading, levelling (unskilled) | 12 | md | 900.00 | 10,800.00 |
| Labour: skilled (grade checker / roller operator helper) | 1.5 | md | 1,200.00 | 1,800.00 |
| Water for compaction (3.60 m³) | 3.6 | m³ | 500.00 | 1,800.00 |
| 10-t vibrating roller, 1.50 hr | 1.5 | hr | 4,500.00 | 6,750.00 |
| Sub-total | 138,150.00 | |||
| Contractor's overhead and profit | 15% | 20,722.50 | ||
| Total per 100 m² | 158,872.50 |
Answer: Rate = 158,872.50 / 100 = Rs 1,588.73 per m² (excluding VAT).
Check: the 30 cm rate is three times the 10 cm rate (3 x Rs 529.575 = Rs 1,588.73 per m²), as every quantity scales with the thickness.
✓ Answer checked by Claude Opus 5.5 (high effort)
Related questions
- Rate analysis: 10 cm compacted gravel subgrade · Estimating and Costing, chapter 4 · asked 2×