Asphaltite Ash as a Mineral Filler in Bitumen: Physical, Rheological and Microstructural Assessment
- 1Sirnak University , , M. Emin Acar Campus , ,
- 2Malatya Turgut Ozal University , , ,
- 3Istanbul Technical University , , ,
Abstract
Mining wastes represent a significant environmental challenge due to their large volumes and limited reuse potential. This study evaluates combustion-derived asphaltite ash (AA) as a mineral filler in bituminous binders through physical, rheological, thermal, chemical, and microstructural characterization. AA was produced by laboratory combustion of asphaltite at 1000 °C and incorporated into a B 50/70 binder at contents of 0, 2, 4, 6, and 8 wt % relative to the initial mass of the base binder. Penetration, ductility, and elastic recovery decreased, whereas the softening point increased with AA incorporation. Rotational viscosity decreased at 135 °C but increased at 165 °C relative to the control at the same temperature. Among the tested contents, AA4 exhibited the highest unaged rutting parameter and failure temperature of 78.9 °C, compared with 77.3 °C for the neat binder. However, AA4 also showed the highest stiffness to m-value ratio at −12 °C, indicating a less favorable low-temperature response. SEM–EDX and FTIR observations support a predominantly physical filler action associated with particle dispersion and mineral-phase incorporation, without demonstrating chemical bonding or cross-linking. AA4 exhibited the highest measured thermal degradation temperatures, while the residual mass increased with AA content because of the inorganic nature of the filler. These findings classify AA as a mineral filler and identify 4% AA as a candidate content for further high-temperature evaluation, rather than as a general optimum.
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BibTeX
@article{ozcan2026asphaltite,
title = {{Asphaltite Ash as a Mineral Filler in Bitumen: Physical, Rheological and Microstructural Assessment}},
author = {Ozgur Ozcan and Ahmet Saygin Tatar and Sedat Ozcanan and Abdulgazi Gedik},
journal = {ACS Omega},
year = {2026},
month = oct,
doi = {10.1021/acsomega.6c09051},
url = {https://pubs.acs.org/acsodf/article/11/41/64081/5446688/Asphaltite-Ash-as-a-Mineral-Filler-in-Bitumen},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Asphaltite Ash as a Mineral Filler in Bitumen: Physical, Rheological and Microstructural Assessment
AU - Ozgur Ozcan
AU - Ahmet Saygin Tatar
AU - Sedat Ozcanan
AU - Abdulgazi Gedik
PY - 2026
DA - 2026/10/08
JO - ACS Omega
DO - 10.1021/acsomega.6c09051
UR - https://pubs.acs.org/acsodf/article/11/41/64081/5446688/Asphaltite-Ash-as-a-Mineral-Filler-in-Bitumen
AB - Mining wastes represent a significant environmental challenge due to their large volumes and limited reuse potential. This study evaluates combustion-derived asphaltite ash (AA) as a mineral filler in bituminous binders through physical, rheological, thermal, chemical, and microstructural characterization. AA was produced by laboratory combustion of asphaltite at 1000 °C and incorporated into a B 50/70 binder at contents of 0, 2, 4, 6, and 8 wt % relative to the initial mass of the base binder. Penetration, ductility, and elastic recovery decreased, whereas the softening point increased with AA incorporation. Rotational viscosity decreased at 135 °C but increased at 165 °C relative to the control at the same temperature. Among the tested contents, AA4 exhibited the highest unaged rutting parameter and failure temperature of 78.9 °C, compared with 77.3 °C for the neat binder. However, AA4 also showed the highest stiffness to m-value ratio at −12 °C, indicating a less favorable low-temperature response. SEM–EDX and FTIR observations support a predominantly physical filler action associated with particle dispersion and mineral-phase incorporation, without demonstrating chemical bonding or cross-linking. AA4 exhibited the highest measured thermal degradation temperatures, while the residual mass increased with AA content because of the inorganic nature of the filler. These findings classify AA as a mineral filler and identify 4% AA as a candidate content for further high-temperature evaluation, rather than as a general optimum.
SN - 2470-1343
ER -