I have been working on total substitution of natural filler by sewage sludge ash and it improves the properties of the bituminous mixes (BBTM mixes). Sewage sludge ash is an innert material so you can use it without problems.

Using Sewage-Sludge Ash as Filler in Bituminous Mixes DOI:: /10.1061/(ASCE)MT.1943-5533.0001087

Is important to study the properties of the filler that you want to use for your bituminous mix (density because you must use the correct amount of it) and the composition (some elements can affect the adhesivity of the filler with the bitumen). With filler from crushed ceramics (clay), maybe the mix will have problems with the adhesivity filler-bitumen.

Thank you Antonio.

Hi Francisco,

this is not really an answer but kind of a "footnote"...

Actually all asphalt plants use "dust collectors" that recover fines (i.e. dust or filler) from aggregates in order to return it to the mix in a controlled amount. This may be considered a sort of "recycling". Besides, searching "recycled filler asphalt" in Google Scholar I found some interesting publications.

Regards

Andrea

Thanks a lot Andrea. I will look into it.

Hi Francisco,

I like answer from Antonio. I have never tried using recycled fillers in bituminous mixes. However, I have seen people using, Granite, marble, CKD fillers. Now Antonio said sewage sludge ash can be used, which is excellent. Best,

I thank you all for your contributions. I did found quite a bit more information, more than I expected. Antonio's reference was very interesting for the pursuit of this research.

Hi.

I use a mineral filler from dedusting system mineral mix plant in the technology deep cold recycling with foamed bitumen. 

Glass powder and cement has also been used as filler. 

http://www.iasj.net/iasj?func=fulltext&aId=82394

http://library.iugaza.edu.ps/thesis/109973.pdf

Ground Tire Rubber (GTR)

https://www.researchgate.net/publication/294580079_Characteristics_of_Asphalt_Mixtures_Modified_with_Treated_Rubber_Added_During_the_Mixing_Process

Reclaimed Asphalt Pavement (RAP)

https://www.researchgate.net/publication/263385442_Evaluating_the_effect_of_rejuvenators_on_the_degree_of_blending_and_performance_of_high_RAP_RAS_RAPRAS_mixtures

Conference Paper Characteristics of Asphalt Mixtures Modified with Treated Ru...

Article Evaluating the effect of rejuvenators on the degree of blend...

Ground Tire Rubber (GTR)

https://www.researchgate.net/publication/294580079_Characteristics_of_Asphalt_Mixtures_Modified_with_Treated_Rubber_Added_During_the_Mixing_Process

Reclaimed Asphalt Pavement (RAP)

https://www.researchgate.net/publication/263385442_Evaluating_the_effect_of_rejuvenators_on_the_degree_of_blending_and_performance_of_high_RAP_RAS_RAPRAS_mixtures

Conference Paper Characteristics of Asphalt Mixtures Modified with Treated Ru...

Article Evaluating the effect of rejuvenators on the degree of blend...

Ground Tire Rubber (GTR)

https://www.researchgate.net/publication/294580079_Characteristics_of_Asphalt_Mixtures_Modified_with_Treated_Rubber_Added_During_the_Mixing_Process

Reclaimed Asphalt Pavement (RAP)

https://www.researchgate.net/publication/263385442_Evaluating_the_effect_of_rejuvenators_on_the_degree_of_blending_and_performance_of_high_RAP_RAS_RAPRAS_mixtures

Conference Paper Characteristics of Asphalt Mixtures Modified with Treated Ru...

Article Evaluating the effect of rejuvenators on the degree of blend...

Thank you for all links and documentation. Appreciate.

Dear Francisco,

You can take advantage of the following articles:

http://www.sciencedirect.com/science/article/pii/S0950061817303604

http://www.sciencedirect.com/science/article/pii/S0950061816318621

http://www.sciencedirect.com/science/article/pii/S0950061817301538

https://link.springer.com/article/10.1617/s11527-017-1015-9

http://www.sciencedirect.com/science/article/pii/S0950061817303458

http://www.sciencedirect.com/science/article/pii/S095006181730212X

Dear Francisco,

See below which could be of benefit for you,

http://www.sciencedirect.com/science/article/pii/S0950061816312144

Regards

Anmar

Thank you Anmar and Hamid for your contributions. 

 Dear Fernandes

Much of recycled or waste materials have been implemented as partial substitute of mineral filler such as cement kiln dust, fly ash, brick powder, silica fumes, i can provide you with some manuscript on the subject if you are interested.

Dear Francisco M. Fernandes

You can check this reference, may be is useful for you.