Selecting the right bitumen grade isn’t guesswork; it’s science. Iraq’s climate varies dramatically from the hot southern plains to the cooler northern mountains, meaning the same asphalt mix can perform differently across regions. That’s why proper bitumen grade matching matters for long-term pavement performance and maintenance savings.
In this guide, we’ll break down how to choose suitable grades for Baghdad, Basra, and Erbil based on climate, traffic, and project type.
Why Grade Matching Matters
Every bitumen grade behaves differently under heat, load, and aging. A highway in Basra experiences surface temperatures that can exceed 70°C, while an Erbil road may face freeze-thaw cycles in winter. Using the wrong grade can cause rutting, cracks, or premature failure.
At Iraq Altaqa, we help clients match grades scientifically using local temperature data and international standards (ASTM, AASHTO, BS EN). The goal is simple deliver durability that fits Iraq’s climate zones.
Understanding the Main Bitumen Families
Penetration Grade Bitumen (ASTM & BS EN 12591)
Used for general road construction and moderate traffic. Example: ASTM 60-70 for Baghdad and 85-100 for cooler areas.
Performance Grade Bitumen (AASHTO M320/ASTM D6373)
Tailored for specific high or low pavement temperatures, labeled as PG 70-22, PG 76-22, or PG 82-22.
Polymer Modified Bitumen (PMB)
Ideal for high-load urban roads, airports, and bridges requiring extra elasticity.
Crumb Rubber Modified Bitumen (CRMB)
Eco-friendly option offering resilience for heavy-duty and industrial pavements.
Viscosity Grade Bitumen (VG 10–40)
Common for flexible pavements; selected based on traffic load and ambient temperature.
Regional Grade Recommendations
Baghdad – Central Iraq
Average high temperature: ~45°C in summer. Typical Projects: City roads, expressways, bridges
Recommended Grades:
- PG 70-22 or ASTM 60-70 for most applications
- PMB 25/55-65 for bridges and intersections
- CRMB-55 for bus corridors
Why: Balances heat resistance and flexibility for high traffic and moderate winters.
Basra – Southern Iraq
Average high temperature: ~50°C; high humidity. Typical Projects: Desert highways, ports, industrial roads
Recommended Grades:
- PG 76-22 or PG 82-22 for extreme heat
- PMB 10/40-65 for heavy-load highways
- ASTM 40-50 for stiff pavements under heavy trucks
Why: High resistance to rutting and deformation under heavy loads and extreme heat.
Erbil – Northern Iraq
Average low temperature: ~0°C in winter
Typical Projects: Mountain roads, urban developments
Recommended Grades:
- PG 70-28 or PG 70-34 for cold tolerance
- ASTM 85-100 or BS EN 160-220 for flexible pavements
- VG-20 for low-temperature flexibility
Why: Prevents thermal cracking and maintains elasticity in cold conditions.
Step-by-Step Grade Selection
- Identify pavement temperature range (highest and lowest).
- Assess traffic category: light, medium, or heavy load.
- Match to PG, Penetration, or Viscosity grade using international charts.
- Confirm through lab testing and mix design trials.
- Verify with CoA before ordering bulk quantities.
How Iraq Altaqa Supports Clients
Our technical team provides:
- Free Grade Matching: tailored to Iraq’s climatic zones.
- Sample Testing: lab validation before large procurement.
- 24/7 Support: to ensure smooth coordination during paving cycles.
We use real project data to guide recommendations, not guesswork. Each consultation includes climate profiles, viscosity curves, and delivery options.
Speak to our expert
Planning a project in Baghdad, Basra, or Erbil? Talk to our experts for climate-specific grade matching and CoA samples.
Request a quote or book a consultation today.
