Slurry Seals and Micro-Surfacing with Gilsonite
Slurry seals and micro-surfacing combine emulsion, fine aggregate and filler.
Gilsonite’s potential role
Can be incorporated into the asphalt before emulsification to increase stiffness and rut resistance of micro-surfacing.
Considerations
Requires compatible emulsifiers and testing.
What slurry seals and micro-surfacing are
Both combine asphalt emulsion, fine aggregate, mineral filler, water and additives, mixed and spread in a thin layer. Micro-surfacing uses polymer-modified emulsions and can fill ruts.
Why stiffness matters
Micro-surfacing on busy roads and in rut-filling must resist deformation. A stiffer residual binder helps.
How gilsonite can be included
Gilsonite is dissolved in the base bitumen before emulsification. The emulsion supplier must confirm stability and breaking behaviour with the chosen emulsifier.
Testing
Mix design tests such as wet track abrasion, loaded wheel test and cohesion development should confirm performance.
Recommended product
Sealer & Filler Grade Gilsonite
| Property | Typical value | Test method |
|---|---|---|
| Appearance | Black powder | Visual |
| Softening point (R&B) | 150 – 180 °C | ASTM D36 |
| Ash content, max | 5 % | ASTM D3174 |
| Moisture, max | 1 % | ASTM D95 |
| Solubility in toluene, min | 98 % | ASTM D2042 |
| Particle size | ≤ 200 mesh | Sieve |
| Typical dosage | Sealer: 15 – 35 % | |
| Packing | 25 kg bags palletized. | |
Typical values. The final specification is confirmed in the COA of each shipment.
Related articles
Formulating a Gilsonite Pavement Sealer
Drying time, film flexibility, water resistance and colour. Drying time, film flexibility, adhesion to aged asphalt, water resistance…
Solvent-Based vs. Emulsion Gilsonite Sealers
Choose solvent-based where fast traffic return and penetration matter and regulations allow. Choose emulsions for lower VOC.
Gilsonite in Fillers and Putties
Dark fillers and putties for wood, metal and masonry can use gilsonite as a binder. Gilsonite gives a…