Choose a mass, percentage or batch calculation and enter the displayed values. Filler and bitumen percentages must use the same total-mix mass basis.

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Generic filler / entered bitumen mass arithmetic. Percentages must share the same total-mix basis. This is not a standardized dust-to-effective-binder compliance check.

Optional settings

Example ranges are not specifications or design approval.

Filler Bitumen Ratio Formula

The following formula is used to calculate the filler bitumen ratio for a given weight of filler and bitumen.

R = Wf / Wb

Variables:

  • R is the filler bitumen ratio
  • W_f is the weight of filler
  • W_b is the weight of bitumen

Divide filler mass by the entered bitumen mass in consistent units. This generic ratio is not automatically the standardized dust-to-effective-binder ratio: specifications may define the dust fraction, effective binder and percentage bases differently.

What is a Filler Bitumen Ratio?

The filler bitumen ratio is a measure used in the construction and paving industry to determine the proportion of filler material to bitumen in a mixture. This ratio is crucial for ensuring the durability and performance of asphalt pavements. The filler material, often consisting of fine particles like stone dust or cement, helps to fill voids and improve the stability of the asphalt mix. The ratio is one mix-design input and does not establish pavement performance or specification compliance. The calculator’s retained example comparison ranges are illustrative; confirm the applicable material definitions and approved limits separately.

How to Calculate Filler Bitumen Ratio?

The following steps outline how to calculate the Filler Bitumen Ratio.

  1. First, determine the weight of the filler (W_f).
  2. Next, determine the weight of the bitumen (W_b).
  3. Finally, calculate the filler bitumen ratio using the formula R = W_f / W_b.
  4. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Weight of Filler (W_f) = 50 kg

Weight of Bitumen (W_b) = 25 kg