Bitumen Grout
Last updated: 2026-10-18
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Bitumen Grout
Bitumen grout is a hot-applied, asphalt-based sealing material used to fill joints, cracks, and voids in pavements, bridge decks, and industrial floors, typically applied at 160–200°C with a penetration grade of 20/30 to 40/50 dmm. A standard grouting operation consumes 1.2–2.5 kg of grout per linear meter of joint (10 mm wide × 20 mm deep), and material costs run USD 380–650 per tonne depending on grade and region. Properly applied bitumen grout extends joint service life to 8–12 years, versus 2–4 years for cold-pour polymer sealants in heavy-traffic conditions.
What Is Bitumen Grout and How Does It Work?
Bitumen grout is a formulated blend of penetration-grade bitumen, filler (limestone dust or fly ash), and sometimes polymer modifiers (SBS or APP at 2–5% by weight). It is melted in a heated kettle or melter and poured or injected into prepared joints and cracks, where it cools and sets into a flexible, waterproof plug.
How it performs:
- Adhesion: bonds mechanically to clean, dry concrete or asphalt joint faces; primer (0.2–0.3 kg/m²) improves bonding on aged substrates.
- Elastic recovery: unmodified grout recovers 40–60% of deformation; SBS-modified grout recovers 75–90%, which matters on bridge decks and airfield aprons.
- Thermal tolerance: service range from −20°C to +70°C for polymer-modified grades; unmodified grades are limited to −10°C to +60°C.
- Waterproofing: joint permeability drops to effectively zero when the grout fills ≥90% of joint depth.
Typical composition:
| Component | Share by weight | Function |
|---|---|---|
| Penetration-grade bitumen (20/30–40/50) | 65–80% | Binder, waterproofing |
| Mineral filler (limestone/fly ash) | 15–30% | Stiffness, heat resistance |
| SBS/APP polymer (modified grades) | 2–5% | Elasticity, low-temp flexibility |
| Wax or oil additive (optional) | 0–3% | Workability, pour point control |
Bitumen Grout vs. Alternative Joint Sealants
Buyers compare bitumen grout with hot-pour polymer sealant, cold-pour silicone, and epoxy mortar. The table below summarizes performance and cost per linear meter of a 10 mm × 20 mm joint.
| Criterion | Bitumen Grout (unmodified) | Bitumen Grout (SBS-modified) | Hot-Pour Polymer Sealant | Cold-Pour Silicone |
|---|---|---|---|---|
| Material cost per tonne | USD 380–480 | USD 520–650 | USD 900–1,400 | USD 2,500–4,000 |
| Cost per linear meter (10×20 mm) | USD 0.9–1.4 | USD 1.3–1.9 | USD 2.1–3.2 | USD 4.5–7.0 |
| Service life, heavy traffic | 6–8 years | 8–12 years | 8–10 years | 5–7 years |
| Application temperature | 160–180°C | 175–200°C | 180–200°C | Ambient |
| Traffic reopening time | 30–60 min | 45–90 min | 60–120 min | 4–12 hours |
| Elastic recovery | 40–60% | 75–90% | 80–95% | >90% |
| Best use case | Rural roads, yard joints | Bridge decks, airfields | Highway joints | Facades, low-movement joints |
Key takeaways:
- Bitumen grout costs 35–55% less per linear meter than hot-pour polymer sealant while delivering comparable life in moderate-traffic joints.
- Cold-pour silicone is 3–5× more expensive per meter and slower to reopen to traffic, but wins on low-movement architectural joints.
- For joints with movement exceeding ±25% of joint width, specify SBS-modified grout or a polymer sealant — unmodified bitumen grout will fail by adhesion loss within 2–3 winters.
Specification Data: Grades, Properties, and Test Standards
Specifying bitumen grout correctly means matching grade to climate and traffic. The table below gives typical values; always confirm against the supplier's certificate of analysis and project specification (common references: ASTM D3405, EN 14188-1, AASHTO M 324).
| Property | Test method | 20/30 Grade | 40/50 Grade | SBS-Modified |
|---|---|---|---|---|
| Penetration at 25°C (dmm) | ASTM D5 / EN 1426 | 20–30 | 40–50 | 30–45 |
| Softening point (°C) | ASTM D36 / EN 1427 | 55–65 | 45–55 | 75–95 |
| Flash point (°C, min) | ASTM D92 | 240 | 230 | 240 |
| Density at 25°C (kg/m³) | ASTM D70 | 1,010–1,030 | 1,010–1,030 | 1,000–1,020 |
| Elastic recovery at 25°C | ASTM D6084 | n/a | n/a | 75–90% |
| Recommended climate | Hot (>35°C summer) | Temperate | All, incl. cold |
Specification checklist before ordering:
- Confirm penetration grade against the 7-day mean maximum pavement temperature at the site (rule of thumb: 20/30 for >35°C, 40/50 for <30°C).
- Require a softening point at least 10°C above the expected pavement surface temperature.
- For bridge decks and airfields, mandate SBS modification with elastic recovery ≥75% and a supplier test report no older than 6 months.
- Check packaging: 20–25 kg craft-paper bags or 1,000 kg bulk melters; bagged grout adds USD 25–40 per tonne in packaging cost.
Application Process, Consumption Rates, and Timelines
Bitumen grout performance depends more on surface preparation and pour temperature than on the material itself. A typical 500-meter joint sealing crew completes 300–450 meters per day with a two-person team and a 250 kg melter.
Step-by-step process:
1. Routing and cleaning: saw-cut or rout joints to 10–15 mm width × 20–25 mm depth; blast with compressed air at ≥6 bar and dry the joint (moisture content below 1%).
2. Priming: apply bitumen primer at 0.2–0.3 kg/m² on concrete; allow 30–60 minutes to dry.
3. Heating: bring grout to 160–180°C (unmodified) or 175–200°C (modified); never exceed 220°C — overheating degrades the binder and voids warranties.
4. Pouring: fill to 2–5 mm below the pavement surface, or finish flush and dust with sand for skid resistance.
5. Curing and reopening: traffic can resume after 30–60 minutes at 20°C ambient; below 10°C ambient, allow 90–120 minutes.
Consumption and cost model (per 1,000 meters of joint):
| Joint size | Grout volume | Grout mass (density ~1.02 t/m³) | Material cost @ USD 450/t |
|---|---|---|---|
| 8 × 15 mm | 0.12 m³ | ~122 kg | ~USD 55 |
| 10 × 20 mm | 0.20 m³ | ~204 kg | ~USD 92 |
| 15 × 25 mm | 0.375 m³ | ~383 kg | ~USD 172 |
Add 8–12% wastage for melter residue and spillage. Labor and equipment typically add USD 0.6–1.1 per linear meter, making total installed cost USD 1.5–3.0 per meter for standard joints.
Buying Guide: Pricing, Packaging, and Supplier Checks
Bitumen grout is sold either as a finished formulated product or as base bitumen plus field-blended filler. For export buyers, the finished-product route is safer: the supplier controls penetration, softening point, and filler dispersion.
Price benchmarks (FOB, 2024–2025):
- Unmodified bitumen grout: USD 380–480 per tonne FOB; bulk vessel or flexitank shipments of 20–24 tonnes per 20 ft container equivalent.
- SBS-modified bitumen grout: USD 520–650 per tonne FOB; typically bagged in 20–25 kg moisture-barrier bags, 800–1,000 bags per 20 ft container (~20–25 tonnes).
- Minimum order quantities: 20 tonnes for standard grades; 5–10 tonnes for specialty modified blends from stock.
Supplier due diligence checklist:
- Request certificates of analysis for the last 3 production batches — penetration should not vary more than ±4 dmm and softening point ±5°C between batches.
- Confirm the supplier can ship within 10–15 days of a confirmed order and provides MSDS per GHS/REACH where applicable.
- Verify thermal stability data: grout held at 180°C for 6 hours should show less than 10% penetration change.
- Check references for projects of similar scale — a supplier active in bridge-deck grouting for 5+ years is a lower-risk choice than a trading intermediary.
Frequently Asked Questions
What is bitumen grout used for?
Bitumen grout seals joints, cracks, and voids in asphalt and concrete pavements, bridge decks, and industrial floors. It is hot-applied at 160–200°C and typically fills joints 10–15 mm wide and 20–25 mm deep.
How much does bitumen grout cost?
Unmodified bitumen grout costs USD 380–480 per tonne FOB, while SBS-modified grades run USD 520–650 per tonne. Installed cost is typically USD 1.5–3.0 per linear meter of standard 10 × 20 mm joint, including labor and primer.
How long does bitumen grout last?
Unmodified grout lasts 6–8 years in heavy-traffic joints; SBS-modified grout lasts 8–12 years. Service life drops by roughly 40% if joints are not cleaned and dried to below 1% moisture before pouring.
Can bitumen grout be applied in cold weather?
Yes, with precautions: keep the melter at the upper end of the range (180–200°C for modified grades), preheat the joint with hot air, and allow 90–120 minutes before reopening to traffic at ambient below 10°C. Do not pour into wet or icy joints.
What is the difference between bitumen grout and asphalt?
Bitumen grout contains 65–80% bitumen with 15–30% mineral filler and is formulated for pourability and elasticity in narrow joints. Asphalt is a bulk paving mix with 5–7% bitumen and 90%+ aggregate, designed for load-bearing layers, not joint sealing.
Estimate Your Bitumen Grout Order with the 6Tar Cost Calculator
Before you request a quotation, run your project numbers through the 6Tar cost calculator — enter joint dimensions, total joint length, and grade selection, and it returns tonnage, bag count, and delivered cost within seconds. Export buyers using 6Tar get batch-level certificates of analysis, 20–25 tonne container loadings, and shipment within 10–15 days. [Open the 6Tar cost calculator now] and turn your joint schedule into a firm landed-cost estimate before your next tender deadline.