🛢️ Bitumen Calculator
Estimate bitumen, emulsion, and cutback for road construction
Asphalt Mix Design
Mix Type Presets
Dense Graded (5.5%)
Open Graded (4.5%)
Stone Mastic (6.2%)
Base Course (4.8%)
💰 Cost Parameters
Bitumen Calculation Results
Neat Bitumen
5.5
tons
Emulsion Required
9.2
tons
Cutback Required
7.9
tons
Material Cost
$3,575
USD
📋 Application Breakdown
Application Type:
Asphalt Mix
Quantity:
100 tons mix
Bitumen Content:
5.5%
Neat Bitumen:
5.5 tons
Emulsion (60%):
9.2 tons
Cutback (70% bitumen):
7.9 tons
Material Cost:
$3,575
Application Cost:
$248
📊 Coverage Summary
| Application | Rate | Area/Lot | Bitumen Needed |
|---|---|---|---|
| Asphalt Mix | 5.5% | 100 tons | 5.5 tons |
📊 Bitumen Grade Reference
| Grade | Penetration (mm) | Viscosity (Poise) | Softening Point (°C) | Typical Use |
|---|---|---|---|---|
| 40/50 | 40-50 | 2500-3500 | 52-60 | High traffic, hot climates |
| 60/70 | 60-70 | 2000-3000 | 49-56 | General paving, highways |
| 80/100 | 80-100 | 1600-2400 | 45-52 | Moderate traffic, normal climates |
| 120/150 | 120-150 | 1200-1800 | 42-48 | Cold climates, surface dressing |
| 200/300 | 200-300 | 600-1200 | 37-44 | Prime coats, cold weather |
💧 Bitumen Emulsion Types
| Type | Description | Bitumen Content | Breaking Time | Application |
|---|---|---|---|---|
| RS-1 | Rapid Setting - 1 | 60-65% | Fast (minutes) | Tack coat, surface dressing |
| RS-2 | Rapid Setting - 2 | 65-70% | Fast (minutes) | Slurry seal, chip seal |
| MS-1 | Medium Setting | 60-65% | Medium (30-60 min) | Cold mix, patch work |
| SS-1 | Slow Setting | 57-63% | Slow (hours) | Prime coat, fog seal |
| CSS-1 | Cationic Slow Set | 60-65% | Slow (hours) | Tack coat, fog seal |
Frequently Asked Questions
What is the standard bitumen content in asphalt?
Standard bitumen content in asphalt mixes ranges from 4.5% to 6.5% by weight of total mix. Dense graded mixes: 5-6%, Open graded: 4-5%, Stone mastic asphalt: 5.5-6.5%. The exact percentage depends on aggregate gradation and traffic conditions.
How much bitumen is required for prime coat?
Prime coat application rate: 0.2 to 0.5 gallons per square yard (0.9-2.3 liters per square meter). For granular bases, use 0.3-0.4 gal/yd². For cement-treated bases, use 0.2-0.3 gal/yd². The rate varies with base porosity.
What is the tack coat application rate?
Tack coat application rate: 0.05 to 0.15 gallons per square yard (0.2-0.7 liters per square meter). For normal surfaces: 0.08-0.10 gal/yd². For milled surfaces: 0.12-0.15 gal/yd². For old oxidized surfaces: 0.10-0.12 gal/yd².
How do you calculate bitumen content in asphalt mix?
Bitumen content % = (Weight of bitumen ÷ Total mix weight) × 100. For 1000 tons of asphalt at 5% bitumen: 1000 × 0.05 = 50 tons of bitumen. For emulsion, divide by solids content (e.g., 50 ÷ 0.6 = 83.3 tons of 60% emulsion).
What is the difference between bitumen and asphalt?
Bitumen is the black, viscous binder derived from crude oil. Asphalt (or asphalt concrete) is the mixture of bitumen and aggregates. Bitumen = binder, Asphalt = completed paving material. Asphalt typically contains 4-6% bitumen.
How much bitumen is needed for surface dressing?
Surface dressing bitumen rates: Single seal: 0.15-0.25 gal/yd² (0.7-1.1 L/m²). Double seal: 0.25-0.35 gal/yd² (1.1-1.6 L/m²). Rates depend on aggregate size: 10mm aggregate needs 0.18-0.22 gal/yd², 14mm needs 0.22-0.26 gal/yd².