Dense Graded Asphalt Concrete
Last updated: 2026-10-08
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Dense Graded Asphalt Concrete: Composition, Specs & Export Pricing
Dense graded asphalt concrete is a continuously graded hot-mix asphalt (HMA) in which aggregate particles are distributed from coarse to fine to minimize air voids—typically 3–5% after compaction. Standard dense-graded mixes such as AC-20 and AC-30 are used in roughly 80–90% of all paved road surfaces worldwide, with compacted density reaching 2.35–2.45 t/m³ and optimum asphalt content usually falling between 4.5% and 6.0% by weight of mix. For export buyers, bulk dense graded asphalt (penetration grades 60/70 and 40/50) typically prices between USD 380 and USD 520 per metric ton FOB, depending on grade, packaging and volume.
This guide covers dense-graded asphalt concrete composition, gradation limits, comparison with other asphalt concrete types, quality specifications, and export logistics — with copy-ready data tables for engineers, contractors and importers.
What Is Dense Graded Asphalt Concrete?
Dense graded asphalt concrete (DGAC) is a hot-mix asphalt in which the aggregate blend is continuously graded so that smaller particles fill the voids between larger ones. The result is a dense, stiff, load-spreading mix with low permeability and high durability. It is the default wearing course and base course material for highways, airfields, port pavements and industrial yards.
Key performance characteristics:
- Air voids (compacted): 3–5% (wearing course); 4–7% (base course)
- Voids in mineral aggregate (VMA): minimum 13–15%
- Marshall stability: 8–15 kN (heavy traffic mixes)
- Compacted bulk density: 2.35–2.45 t/m³
- Permeability: typically < 10⁻⁶ cm/s — effectively impermeable
| Sieve size (mm) | Passing (%) | Function |
|---|---|---|
| 25.0 | 100 | Top size control |
| 19.0 | 90–100 | Nominal max aggregate |
| 12.5 | 65–85 | Coarse fraction |
| 9.5 | 55–75 | Coarse/fine transition |
| 4.75 | 35–55 | Fine aggregate boundary |
| 2.36 | 25–40 | Fine aggregate |
| 0.075 | 3–8 | Filler / dust |
In practice, a 19 mm NMAS dense-graded mix at 5.2% asphalt content will deliver 4.0% air voids at 96% of theoretical maximum density (TMD) — the single most common acceptance criterion in highway specifications.
Dense Graded vs Other Asphalt Concrete Types
Dense-graded mixes sit at the center of the asphalt family. The table below compares them against the mixes buyers most often ask about.
| Property | Dense Graded (DGAC) | Open Graded (OGFC) | Stone Mastic (SMA) | Gap Graded |
|---|---|---|---|---|
| Air voids (compacted) | 3–5% | 18–22% | 3–4% | 6–12% |
| Asphalt content | 4.5–6.0% | 5.5–6.5% | 6.0–7.5% | 5.0–6.0% |
| Permeability | Low | High (drains) | Low | Moderate |
| Skid resistance | Moderate | High | High | Moderate |
| Noise reduction | Low | High | Moderate | Moderate |
| Typical unit cost (USD/t) | 70–110 | 90–140 | 100–160 | 75–115 |
| Best application | Highways, ports, airfields | Wet-climate surface courses | Heavy-traffic wearing courses | Interlayers, base |
| Global usage share | ~80–90% | 2–5% | 5–10% | 3–8% |
Takeaway for buyers: dense-graded asphalt concrete is the most cost-efficient structural layer per ton. It trades drainage and noise benefits for superior load-bearing, impermeability and lower unit cost. On projects where the structural number (SN) governs thickness design, dense-graded base and binder courses almost always win on cost per unit of structural capacity.
| Parameter | AC-20 (binder) | AC-30 (base) | SMA-20 |
|---|---|---|---|
| Optimum asphalt (%) | 4.8–5.4 | 4.5–5.0 | 6.2–7.0 |
| Stability (kN) | 9–12 | 10–15 | 8–11 |
| Flow (0.25 mm) | 8–14 | 8–16 | 12–20 |
| Air voids (%) | 4.0 | 4.0 | 3.5 |
| VMA (%) | 14 min | 13 min | 17 min |
Export Specifications, Standards and Test Data
For importers sourcing dense graded asphalt materials — whether as penetration-grade bitumen for on-site HMA production, or as pre-blended aggregate feedstocks — specification certainty is everything. Dense-graded asphalt concrete is governed internationally by:
- AASHTO M 323 / ASTM D3515 — Superpave and dense-graded HMA specification
- EN 13108-1 — European standard for asphalt concrete (AC)
- ASTM D6926 — Marshall specimen preparation
- ASTM D6927 — Marshall stability and flow
- AASHTO T 283 — moisture susceptibility (TSR ≥ 80%)
| Test | Standard | Typical Result | Acceptance Limit |
|---|---|---|---|
| Air voids (%) | AASHTO T 269 | 4.0 | 3–5 |
| Marshall stability (kN) | ASTM D6927 | 11.5 | ≥ 8.0 |
| Flow (0.25 mm) | ASTM D6927 | 11 | 8–14 |
| TSR (%) | AASHTO T 283 | 85 | ≥ 80 |
| Bulk density (t/m³) | AASHTO T 166 | 2.40 | Report |
| Permeability (cm/s) | ASTM D5084 | 3 × 10⁻⁷ | < 10⁻⁶ |
| Asphalt content (%) | AASHTO T 308 | 5.2 | ± 0.3 |
| Climate | Recommended Penetration Grade | Viscosity Grade | PG Grade |
|---|---|---|---|
| Hot (avg 7-day max > 40°C) | 40/50 | AC-30 | PG 64-10 |
| Temperate | 60/70 | AC-20 | PG 64-22 |
| Cold | 80/100 | AC-10 | PG 58-28 |
| Middle East export standard | 60/70 | AC-20 | PG 64-16 |
Practical benchmark: 1 km of a 7 m-wide, 50 mm-thick dense-graded wearing course requires approximately 385 tons of compacted mix (7 × 0.05 × 1000 × 2.4 × 1.05 compaction factor ≈ 385 t ≈ 1,000 t/km at 50 mm), consuming around 20 tons of 60/70 bitumen at 5.2% asphalt content.
Dense Graded Asphalt Pricing, Tonnage and Export Logistics
| Product | Grade | Price (USD/t) | MOQ (t) | Lead Time |
|---|---|---|---|---|
| Penetration bitumen | 60/70 | 380–450 | 100 | 10–15 days |
| Penetration bitumen | 40/50 | 420–520 | 100 | 10–20 days |
| Cutback bitumen | MC-30 | 480–560 | 50 | 15–20 days |
| Emulsion (CSS-1h) | — | 350–430 | 20 | 7–12 days |
| Pre-blended HMA feedstock | 19 mm NMAS | 620–750 | 500 | 20–30 days |
Pre-blended HMA feedstock is rarely exported in bulk; most international buyers import bitumen and blend locally.
| Project | Area | Thickness | Mix Volume | Compacted Tons | Bitumen Tons (5.2%) |
|---|---|---|---|---|---|
| Access road | 1,000 m² | 50 mm | 50 m³ | 120 t | 6.24 t |
| Secondary highway | 10,000 m² | 60 mm | 600 m³ | 1,440 t | 74.9 t |
| Port hardstand | 50,000 m² | 80 mm | 4,000 m³ | 9,600 t | 499 t |
| Airport apron | 100,000 m² | 100 mm | 10,000 m³ | 24,000 t | 1,248 t |
- FCL (20 ft flexitank): 20–24 t per container
- Breakbulk vessel: 3,000–10,000 t per shipment
- Standard export drums: 150 kg / drum, 180 kg / drum
- Production-to-loading time: 5–10 days at plant
- Port handling to delivery: 10–25 days depending on destination
Cost rule of thumb: dense-graded asphalt concrete placed cost in export markets runs USD 95–160 per compacted ton (materials + haul + laydown + compaction), while material-only cost is USD 60–90 per ton. Bitumen represents 55–70% of the material cost — so binder purchasing decisions dominate project economics.
How to Specify and Order Dense Graded Asphalt Concrete
When sourcing dense graded asphalt concrete, verify these six items before placing an order:
- NMAS: 9.5 mm (surface), 19 mm (wearing/binder), 25–37.5 mm (base) — match to lift thickness; minimum lift = 3× NMAS
- Binder grade: 60/70 or 40/50 for hot climates; PG 64-22 for temperate zones
- Asphalt content tolerance: ± 0.3% by weight of mix
- Air void target: 4.0% ± 1.0% at acceptance
- TSR minimum: 80% (moisture damage resistance)
- Certification: ISO 9001 mill certs, AASHTO/ASTM test reports per batch, third-party SGS/BV inspection
| Item | Requirement | Why It Matters |
|---|---|---|
| Gradation | Within ASTM D3515 band | Controls VMA and density |
| Binder content | 4.5–6.0% | Durability and stiffness |
| Compaction | ≥ 96% TMD | Rutting resistance |
| Moisture resistance | TSR ≥ 80% | Stripping prevention |
| Flat/elongated particles | ≤ 15% | Workability |
| Sand equivalent | ≥ 45 | Clean fines |
FAQ: Dense Graded Asphalt Concrete
Q1: What is the difference between dense graded and open graded asphalt?
Dense-graded asphalt has 3–5% air voids and is nearly impermeable, while open-graded asphalt has 18–22% air voids and drains water internally. Dense-graded mixes are the standard for structural layers and heavy-traffic highways; open-graded mixes are used as thin surface courses for wet-weather skid resistance.
Q2: How much does dense graded asphalt cost per ton?
Material-only costs typically run USD 60–90 per compacted ton, and placed costs run USD 95–160 per ton depending on region and haul distance. Export bitumen for producing DGAC (60/70 grade) prices at USD 380–450 per metric ton FOB.
Q3: What is the optimum asphalt content for dense graded asphalt concrete?
For a 19 mm NMAS dense-graded mix, optimum asphalt content usually falls between 4.8% and 5.4% by weight of total mix. The exact value is fixed by Marshall or Superpave mix design targeting 4.0% air voids at 96% compaction.
Q4: How many tons of dense graded asphalt do I need per kilometer of road?
A 7 m-wide, 50 mm-thick dense-graded wearing course needs approximately 385 tons per kilometer of compacted mix, or about 1,000 tons per kilometer when a 50 mm lift is expressed in loose-laid tonnage terms. This equates to roughly 20 tons of 60/70 bitumen at 5.2% binder content.
Q5: How long does dense graded asphalt concrete last?
Properly designed and compacted dense-graded asphalt concrete lasts 15–25 years as a wearing course and 30–40 years as a base layer with routine maintenance. Service life depends primarily on binder grade selection, compaction quality (≥ 96% TMD) and traffic loading.
Estimate Your Dense Graded Asphalt Cost with 6Tar
Dense graded asphalt concrete remains the world's most specified HMA — roughly 80–90% of paved surfaces — because