Asphalt Overlay Bitumen In Solomon Islands
Last updated: 2026-10-12
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Asphalt overlay bitumen delivered to Solomon Islands (Honiara port) costs USD 620–780 per metric tonne (CIF) in 2025, depending on grade (penetration 60/70, 80/100, or PG 64-22), packaging (bulk flexitank, 180 kg drums, or 1 MT jumbo bags), and order volume. A typical airport or highway overlay project in Solomon Islands requires 80–150 tonnes per lane-kilometre at 40–50 mm compacted thickness, meaning a 5 km single-lane overlay consumes roughly 400–750 tonnes of bitumen and takes 14–28 days to ship from Singapore or Port Klang to Honiara. For smaller pothole and patch works, drummed bitumen moves in 20-foot containers (80 drums = 14.4 MT) with 21–28 day transit times.
Solomon Islands Road Network: Why Asphalt Overlay Bitumen Matters
The Solomon Islands has roughly 1,600 km of roads, of which only about 130 km are sealed or paved — primarily the Kukum Highway in Honiara, the Lungga–Burns Creek corridor, and airport access roads serving Honiara International Airport (HIR). The remaining network is coral, gravel, or unsealed laterite that degrades rapidly during the November–April wet season, when rainfall exceeds 3,000 mm annually in parts of Guadalcanal.
Because of this, demand for asphalt overlay bitumen in Solomon Islands is driven by three factors:
- Tropical climate stress — high UV, 28–32°C ambient temperatures, and heavy monsoon rain cause rutting, stripping, and oxidation of existing seals.
- Limited local refining — Solomon Islands has zero bitumen production capacity; 100% is imported, mostly from Singapore, Malaysia, South Korea, and Australia.
- Donor-funded rehabilitation — ADB, World Bank, and JICA-funded projects (e.g., Honiara road upgrades, Noro–Munda access roads) specify penetration grade 60/70 or polymer-modified PG 64-22 for overlays.
| Parameter | Value |
|---|---|
| Primary import port | Honiara (Point Cruz / Honiara Wharf) |
| Main supply origins | Singapore, Port Klang (Malaysia), Ulsan (S. Korea), Brisbane (Australia) |
| Typical transit time | 18–30 days (breakbulk), 21–28 days (container) |
| Duty / tariff on bitumen | 0% (most grades, under SI customs concessions for road materials) |
| GST | 15% on landed value |
| Annual national bitumen import (est.) | 3,000–5,000 MT |
Bitumen Grades & Specifications for Solomon Islands Overlays
Not all bitumen performs equally in tropical island conditions. The Australian/New Zealand standard AS 2008 and ASTM D946 are the most commonly referenced specs in Solomon Islands tenders, though British Standard BS EN 12591 also appears in older ADB documentation.
| Application | Recommended Grade | Why |
|---|---|---|
| Highway overlay (Kukum Hwy, 40–50 mm) | Pen 60/70 or PG 64-22 | High stiffness, resists rutting at 30°C+ |
| Airport runway overlay (HIR) | PG 64-22 or PMB 40 | Fuel resistance, heavy aircraft loads |
| Pothole patching / skin patch | Pen 80/100 or cutback MC-30 | Easier workability in small batches |
| Chip seal / surface dressing | Pen 80/100 or CRS-2 emulsion | Coats aggregate in humid conditions |
| Bridge deck waterproofing | PMB or oxidized 85/25 | Flexibility, adhesion |
| Property | Pen 60/70 | PG 64-22 | PMB 40 |
|---|---|---|---|
| Softening point (°C) | 49–56 | 58–64 | 65–75 |
| Penetration @25°C (0.1 mm) | 60–70 | 60–70 | 40–55 |
| Rutting resistance | Moderate | High | Very High |
| Cost CIF Honiara (USD/MT) | 620–680 | 690–740 | 750–820 |
| Best use in Solomon Is. | General overlay | Runway, heavy traffic | Critical intersections |
| Typical supplier | Singapore/Malaysia | S. Korea/Singapore | Australia/S. Korea |
Pricing Breakdown: What Drives Asphalt Overlay Bitumen Cost in Solomon Islands
The landed cost of bitumen in Honiara is roughly 35–55% higher than the FOB Singapore price due to freight, packaging, port handling, and low-volume premium. Below is a realistic 2025 cost stack for Pen 60/70 in drums.
| Cost Component | USD/MT | Notes |
|---|---|---|
| FOB Singapore (Pen 60/70) | 430–480 | Base refinery price |
| Ocean freight | 80–130 | 20-ft container, 14.4 MT/box |
| Packaging (drums) | 40–60 | 180 kg drums, non-returnable |
| Port handling & THC | 25–40 | Honiara wharf charges |
| Insurance | 8–15 | Marine cargo |
| Agent / documentation | 15–25 | Customs broker |
| Total CIF Honiara | 620–780 | Bulk flexitank: −USD 60–90/MT |
| Packaging | Net Weight | Units per 20-ft | Cost Premium | Best For |
|---|---|---|---|---|
| Bulk flexitank | 20–24 MT | 1 | Lowest (−USD 60–90/MT) | Large overlays, 200 MT+ |
| Steel drums | 180 kg | 80 (14.4 MT) | +USD 40–60/MT | Small projects, remote sites |
| Jumbo bags | 1 MT | 20 (20 MT) | +USD 20–35/MT | Inter-island barge transfer |
| Bitutainers | 1 MT | 20 | +USD 30–45/MT | Reusable, tidy yards |
Rule of thumb: If your project exceeds 150 tonnes, always request a bulk flexitank quote — the savings often cover the cost of a Honiara-side decanting pump and heated tank rental.
Logistics & Lead Times: Getting Bitumen to Honiara
Solomon Islands shipping is not as frequent as Fiji or PNG, so lead time planning is critical. Most bitumen arrives on breakbulk or container vessels routed via Brisbane, Suva, or Port Moresby.
| Stage | Duration |
|---|---|
| Order confirmation & packing | 5–10 days |
| Inland haulage to load port | 2–4 days |
| Ocean transit (Singapore → Honiara) | 18–30 days |
| Customs clearance at Honiara | 3–7 days |
| Decanting / haulage to site | 1–3 days |
| Total | 29–54 days |
- Book 6–8 weeks ahead of your overlay start date — vessels to Honiara are often fortnightly or monthly.
- Use 20-ft containers — 40-ft boxes are hard to handle at smaller wharves and inter-island barges.
- Confirm heated storage — Honiara daytime temps can hit 33°C, but drums still need protection from direct sun and rain to prevent skin damage.
- Check the GST exemption — road-authority and government tenders may qualify for GST relief; private contractors generally pay the full 15%.
- Plan for inter-island transfers — if the project is on Malaita, Choiseul, or Western Province, allow another 3–7 days for barge transfer and +USD 60–120/MT in handling.
| Month | Rainfall Risk | Overlay Suitability |
|---|---|---|
| May–Oct | Low–Moderate | Best window |
| Nov–Dec | High | Marginal |
| Jan–Apr | Very High (monsoon) | Avoid if possible |
How to Specify & Apply Asphalt Overlay Bitumen Correctly
Correct specification prevents the most common tropical overlay failures: stripping, reflective cracking, and rutting.
| Parameter | Recommended Value |
|---|---|
| Bitumen content (AC by weight of mix) | 5.0–6.5% |
| Compaction thickness | 40–50 mm (single lift) |
| Tack coat rate | 0.3–0.5 L/m² (CRS-2 or PMB emulsion) |
| Mixing temp (drum plant) | 155–165°C |
| Compaction temp | 140–150°C (breakdown), >120°C (finish) |
| Air voids | 4–6% |
In Solomon Islands' humid, high-rainfall environment, moisture damage is the #1 overlay killer. Always:
- Add 0.3–0.5% liquid anti-strip (e.g., amine-based) to the bitumen, or
- Use hydrated lime (1–2% by aggregate weight) as a pre-treatment, and
- Verify with AASHTO T283 (TSR ≥ 80%) before shipping mix design to site.
FAQ: Asphalt Overlay Bitumen in Solomon Islands
Q1: How much does asphalt overlay bitumen cost in Solomon Islands?
Bitumen delivered CIF Honiara costs USD 620–780 per metric tonne for Pen 60/70 in drums, or USD 560–690/MT in bulk flexitanks for orders above 150 MT. Polymer-modified grades (PMB 40, PG 64-22) run USD 690–820/MT. Add 15% GST unless exempt.
Q2: How long does shipping bitumen to Honiara take?
From Singapore or Port Klang, expect 18–30 days of ocean transit plus 3–7 days for customs clearance, giving a total door-to-site lead time of 29–54 days. Book at least 6–8 weeks ahead because vessels to Honiara are not daily.
Q3: Which bitumen grade is best for Solomon Islands' climate?
For highways and airport overlays, Pen 60/70 or PG 64-22 performs best — high softening point resists rutting at 30°C+ surface temperatures. For chip seals and patching, Pen 80/100 or CRS-2 emulsion is more workable. Always add anti-strip for moisture resistance.
Q4: How much bitumen do I need per kilometre of overlay?
At 40–50 mm compacted thickness and 5.5% bitumen content, a single-lane kilometre (3.5 m wide) needs roughly 6–9 tonnes of bitumen. A full two-lane kilometre (7 m) needs 12–18 tonnes. For a 5 km, two-lane overlay, budget 60–90 tonnes.
Q5: Can I import bitumen in bulk rather than drums to Solomon Islands?
Yes — bulk flexitanks (20–24 MT per 20-ft container) are increasingly used and save USD 60–90 per tonne versus drums. You will need a heated storage tank and decanting pump in Honiara, which most local contractors rent. Bulk is best for projects over 150 tonnes.
Get an Instant Bitumen Cost Estimate for Your Solomon Islands Project
Whether you are overlaying the Kukum Highway, resurfacing an airport apron in Munda, or patching rural roads in Malaita, accurate bitumen costing is the difference between a winning tender and a lost margin. Use the 6Tar cost calculator to model your exact CIF Honiara price — enter grade (Pen 60/70, PG 64-22, PMB), packaging (bulk, drum, jumbo bag), tonnage, and project location, and get a landed cost estimate in under 60 seconds, including freight, GST, and handling.