---
title: "Rate analysis: 40 mm asphalt wearing coat"
subject: "Estimating and Costing"
chapter: 4
key: "semester_7/estimating_and_costing:rate-asphalt-wearing-coat-10m2"
source: https://www.bctengineer.com/q/semester_7/estimating_and_costing/rate-asphalt-wearing-coat-10m2
site: BCT Engineering
---

# Rate analysis: 40 mm asphalt wearing coat

Estimating and Costing · Chapter 4: Analysis of Rates

- Asked in: 2068 Baisakh (old course), 4 marks
- Video: [Rate Analysis : For providing, laying and compaction 40mm thick premix asphalt concrete per 10m^2.](https://www.youtube.com/watch?v=gw4zr6uzRC8) — OPengineer
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_7/estimating_and_costing/rate-asphalt-wearing-coat-10m2
- Whole chapter: https://www.bctengineer.com/md/semester_7/estimating_and_costing/chapter-4

## Question

Prepare an analysis of rate for 40 mm thick asphalt concrete wearing coat per 10 m².

## Short answer

For 10 m² of 40 mm AC wearing coat, compacted volume 0.40 m³, mix mass 0.92 t at 5.5% bitumen. Quantities: aggregate 0.869 t, bitumen 0.0506 t, tack coat 0.0025 t. Including plant, transport, labour, 15% overhead and 10% profit, rate is NPR 13,974.63 per 10 m² (NPR 1,397.46/m²).

## Answer

Asphalt concrete (AC) wearing coat is a hot-mixed, hot-laid mix of graded aggregate and bitumen. Illustrative rates: aggregate NPR 2,800/tonne, bitumen NPR 95,000/tonne, plant and paver costs as shown, labour NPR 1,500 and NPR 1,100 per day, overhead 15%, profit 10%.

#### Quantities per 10 m²

- Compacted volume $= 10 \times 0.04 = 0.40$ m³; density of compacted mix $= 2.3$ t/m³; mass of mix $= 0.920$ t
- Bitumen content 5.5% of mix $= 0.0506$ t; aggregate $= 0.869$ t
- Tack coat 0.25 kg/m² $= 2.5$ kg per 10 m²

#### Analysis

| Item | Qty | Unit | Rate (NPR) | Amount (NPR) |
|---|---:|---|---:|---:|
| Coarse + fine aggregate (graded) | 0.869 | tonne | 2,800.00 | 2,433.20 |
| Bitumen 60/70 (5.5% of mix) | 0.0506 | tonne | 95,000.00 | 4,807.00 |
| Tack coat bitumen (0.25 kg/m²) | 0.0025 | tonne | 95,000.00 | 237.50 |
| Hot-mix plant (heating, fuel, mixing) | 0.920 | tonne | 1,200.00 | 1,104.00 |
| Transport of mix, paver and rollers | 0.920 | tonne | 900.00 | 828.00 |
| Skilled labour | 0.30 | day | 1,500.00 | 450.00 |
| Unskilled labour | 1.20 | day | 1,100.00 | 1,320.00 |
| **Direct cost** | | | | **11,179.70** |
| Contractor's overhead @ 15% | | | | 1,676.96 |
| Contractor's profit @ 10% | | | | 1,117.97 |
| **Total (rate per 10 m²)** | | | | **13,974.63** |

**Rate = NPR 13,974.63 per 10 m²** (NPR 1,397.46 per m²).

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Mass of mix for 10 m^2 at 40 mm?
   A. 0.40 t
   B. 2.3 t
   C. 0.92 t (0.40 m^3 x 2.3 t/m^3)
   D. 9.2 t
   Answer: C. Density times compacted volume. (Key point: Mix mass)

2. Bitumen content?
   A. 5.5% of aggregate
   B. 5.5% of mix = 0.0506 t
   C. 55% of mix
   D. 0.25 kg/m^2 only
   Answer: B. 0.92 x 0.055. (Key point: Bitumen)

3. Tack coat?
   A. 0.25 kg/m^2 = 2.5 kg per 10 m^2
   B. 0.25 kg per 10 m^2
   C. 25 kg
   D. 5.5%
   Answer: A. Separate bitumen quantity. (Key point: Tack coat)

4. Hot mix plant charged per?
   A. m^2
   B. Day only
   C. Litre of bitumen
   D. Tonne of mix (0.920 t)
   Answer: D. Plant heats and mixes by tonne. (Key point: Plant cost)

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