Dense Graded Asphalt Concrete
Last updated: 2026-09-30
Dense Graded Asphalt Concrete
Dense graded asphalt concrete is a hot-mix asphalt (HMA) mixture with a continuously graded aggregate blend—typically 0–19 mm—designed to achieve air voids of 3–5% after compaction, with aggregate making up 90–95% of the mix by weight and asphalt binder 5–7%. It is the most widely used asphalt mixture globally, accounting for roughly 80% of all paved surfaces, and is suitable for highways, airports, ports, and industrial yards where load-bearing capacity and durability matter. In export markets, dense graded asphalt (often specified to ASTM D3515, AASHTO M 323, or EN 13108-1) is priced between $85 and $140 per metric ton FOB, depending on binder grade (penetration 60/70, 40/50, or PG 64-22), aggregate quality, and shipment volume—typically 25–30 tons per 20-ft container or 3,000–30,000 tons per bulk vessel.
What Is Dense Graded Asphalt Concrete?
Dense graded asphalt concrete is a continuously graded mixture where aggregate particles from coarse to fine are proportioned so that the final compacted mat has low void content and high inter-particle contact. Unlike gap-graded or open-graded mixes, dense graded asphalt contains a full range of sieve sizes, which produces a dense, relatively impermeable surface with:
- Air voids: 3–5% (design target 4%)
- Voids in mineral aggregate (VMA): 13–16%
- Binder content: 5–7% by total mix weight
- Maximum aggregate size: typically 9.5 mm, 12.5 mm, or 19 mm
- Compaction density: 92–96% of theoretical maximum specific gravity (Gmm)
Dense graded asphalt concrete is used in three main layer types:
| Layer | Typical Thickness | Max Aggregate Size | Function |
|---|---|---|---|
| Surface course | 30–50 mm | 9.5–12.5 mm | Wear resistance, skid resistance, waterproofing |
| Binder course | 50–80 mm | 12.5–19 mm | Load distribution, structural strength |
| Base course | 80–150 mm | 19–25 mm | Primary load bearing, foundation layer |
The "dense graded" designation refers to the aggregate gradation curve, which plots as a smooth, continuous S-curve on a 0.45-power sieve chart. This contrasts with stone matrix asphalt (SMA), which is gap-graded, and porous asphalt, which is open-graded.
Dense Graded vs. Other Asphalt Mixtures
Buyers and specifiers frequently compare dense graded asphalt against SMA, open-graded friction course (OGFC), and gap-graded mixes. The table below summarizes the key engineering and commercial differences.
| Property | Dense Graded | SMA | OGFC | Gap-Graded |
|---|---|---|---|---|
| Gradation | Continuous | Gap-graded | Open-graded | Gap-graded |
| Air voids (%) | 3–5 | 3–4 | 18–22 | 4–6 |
| Binder content (%) | 5–7 | 6–7.5 | 4.5–5.5 | 5–6 |
| Typical price ($/t FOB) | 85–140 | 120–180 | 100–150 | 90–145 |
| Skid resistance | Moderate | High | Very high | Moderate |
| Durability | High | Very high | Moderate | High |
| Drainage | Impermeable | Impermeable | Fully permeable | Low permeability |
| Best use | Highways, ports, yards | Heavy traffic, airports | High-speed wet roads | Specialty overlays |
Key takeaway: dense graded asphalt offers the best balance of cost, durability, and availability. SMA costs 20–35% more but lasts longer under very heavy traffic, while OGFC costs similar to dense graded but sacrifices structural strength for drainage.
Mix Design and Specification Standards
Dense graded asphalt is specified under several international standards, depending on the destination market and project owner.
| Standard | Region | Key Parameters | Typical Binder Grades |
|---|---|---|---|
| ASTM D3515 | USA | Gradation, Marshall stability | PG 64-22, PG 70-22 |
| AASHTO M 323 | USA | Superpave volumetric design | PG 58-28 to PG 76-22 |
| EN 13108-1 | EU / UK | AC type, air voids | 50/70, 70/100, PMB |
| JTG F40 | China | Gradation type A/B/C | 70#, 90#, SBS modified |
| IS 73 / MORTH | India | Grading I & II | VG-30, VG-40, CRMB |
Mix design for dense graded asphalt follows the Marshall method (50 or 75 blows per side) or the Superpave gyratory method (N-design 100–125 gyrations). Designers target:
- Optimum binder content: determined at 4% air voids
- Marshall stability: minimum 8.0 kN (heavy traffic)
- Flow: 2–4 mm
- Tensile strength ratio (TSR): minimum 80% (moisture resistance)
For export supply, manufacturers usually provide a mix design report, a job-mix formula (JMF), and a certificate of analysis confirming binder grade, aggregate source, and gradation compliance.
Global Pricing and Export Logistics for Dense Graded Asphalt
Dense graded asphalt is traded either as hot mix (delivered within 2–4 hours of production) or as cold mix / bagged asphalt for export where reheating is impractical. Hot mix is rarely exported across oceans due to temperature loss; instead, export buyers purchase:
1. Asphalt binder (penetration grade or PG grade) and mix locally
2. Cold patch / bagged dense graded mix for pothole repair
3. Pre-blended aggregate-binder pellets for remote projects
The table below provides indicative export pricing as of 2025.
| Product Form | Packaging | Price ($/t FOB) | Min Order | Lead Time |
|---|---|---|---|---|
| Hot mix (local delivery) | Truck | 75–110 | 20 t | 1–3 days |
| Cold patch (bagged) | 25/50 kg bags | 160–220 | 5 t | 7–14 days |
| Binder 60/70 | Drum/bulk | 480–620 | 20 t | 10–21 days |
| Binder PG 64-22 | Bulk vessel | 520–680 | 3,000 t | 20–35 days |
| Modified AC mix | Bulk | 130–180 | 500 t | 15–30 days |
Logistics notes:
- Container shipment: 25–30 t per 20-ft container for bagged cold mix
- Bulk vessel: 3,000–30,000 t for binder or pre-blended materials
- Port handling: 5–10 days for loading and documentation
- Documentation: MSDS, COA, mix design, packing list, bill of lading
For buyers calculating landed cost, factors include freight (10–25% of FOB), insurance (0.5–1%), import duty (0–15% by country), and port charges ($15–40/t).
Performance, Durability, and Service Life
Dense graded asphalt concrete typically delivers:
- Service life: 10–15 years for surface courses, 20–30 years for base layers under moderate traffic
- Load capacity: up to 100 million ESALs with proper thickness design
- Rutting resistance: < 10 mm at 60°C with PG 64-22 or modified binder
- Fatigue life: 1–5 million cycles at 400 microstrain
Performance depends heavily on binder grade, aggregate angularity, and compaction. A 200 mm dense graded asphalt pavement structure (50 mm surface + 150 mm base) can support aircraft up to 200 t and port straddle carriers up to 40 t per axle.
FAQ: Dense Graded Asphalt Concrete
Q1: What is the difference between dense graded asphalt and SMA?
Dense graded asphalt uses continuously graded aggregate with 3–5% air voids, while SMA is gap-graded with 3–4% air voids and 6–7.5% binder. SMA costs 20–35% more and offers better rutting resistance under very heavy traffic, but dense graded asphalt is more economical for most highways and yards.
Q2: What is the typical price of dense graded asphalt per ton?
Dense graded asphalt costs $85–140 per metric ton FOB for hot mix and $160–220 per ton for bagged cold patch. Price varies with binder grade, aggregate source, order volume, and freight; PG 64-22 mixes sit at the upper end of the range.
Q3: How many tons of dense graded asphalt fit in a 20-ft container?
A 20-ft container holds 25–30 metric tons of bagged cold-mix dense graded asphalt, limited by the container's 28-ton payload. Hot mix is not container-shipped internationally because it must be placed within 2–4 hours of production.
Q4: What binder grade is used in dense graded asphalt?
Common binder grades are penetration 60/70, 40/50, VG-30, and PG 64-22, with SBS-modified binders for heavy-traffic or high-temperature applications. The binder makes up 5–7% of the mix by weight and is selected based on climate, traffic loading, and specification.
Q5: How long does dense graded asphalt last?
Dense graded asphalt surface courses last 10–15 years, and base layers last 20–30 years under moderate traffic. Service life depends on compaction density (92–96% Gmm), drainage, traffic loading, and maintenance—crack sealing every 3–5 years extends life by 30–50%.
Calculate Your Dense Graded Asphalt Cost with 6Tar
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