Mineral Filler in Asphalt: Role, Grading Limits and Dust-to-Binder Ratio
Mineral filler forms a mortar with bitumen that decides asphalt stability. Learn ASTM D242 limits, the dust-to-binder ratio and how filler type affects a mix.
0–6 mm
Asphalt & Pavement
Asphalt and pavement
Aggregates make up most of the weight of an asphalt mix and determine how the surface behaves.
The role of materials in Asphalt and pavement
Aggregates make up most of the weight of asphalt mixes. Resistance to rutting, cracking and moisture depends largely on aggregate quality, particle shape and mix grading.
In asphalt surfacing, fractured faces and abrasion resistance matter most. Mineral filler also influences the stiffness of the bituminous mortar and the density of the mix; references appear in Publication 234 and ASTM D242.
Selection criteriaWhat matters
Three deciding criteria
- 1
Abrasion resistance
The rock must resist crushing under rollers and traffic.
- 2
Bond with bitumen
Clean particle surfaces and rock compatible with bitumen reduce moisture sensitivity.
- 3
Suitable filler
The fineness and uniformity of filler decide the behaviour of the bituminous mortar and the density of the mix.
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