The Effect of Barite Waste on the Behavior of Bitumen and Asphalt Mixture: Investigating Moisture Sensitivity and Thermal Stability (DSC)

Document Type : Original Article

Authors
Omid Ansari 1
Mohammad Mehdi Khabiri 2
1 M.Sc., Grad., Engineering Faculty, Yazd University, Yazd, Iran.
2 Associated Professor, Engineering Faculty, Yazd University, Yazd, Iran
10.22034/road.2025.513325.2380
Abstract
This research examines the effects of using barite powder as a filler and nano barite as a modifier for bitumen on improving the moisture sensitivity and thermal performance of asphalt mixtures. Asphalt samples were prepared using barite powder as a substitute for the conventional filler (dry mixing) and bitumen modified with nano barite (wet mixing). The results of Marshall stability and moisture sensitivity tests indicated a significant improvement in the performance of asphalt mixtures containing barite in both mixing methods compared to samples with conventional filler. Specifically, the moisture sensitivity for samples containing 6% barite showed a 40% improvement (0.92 compared to 0.65 for the conventional filler). A T-test also confirmed this statistical improvement. Additionally, the properties of bitumen modified with nano barite were evaluated using standard bitumen tests and differential scanning calorimetry (DSC). The DSC results showed that modifying bitumen with nano barite leads to an improvement in thermal stability. The penetration degree of bitumen modified with 3%, 5%, and 7% nano barite decreased, 65, 61, and 57 compared to 68 for the control bitumen, indicating an increase in hardness and resistance to thermal deformation.
Keywords
Barite Powder
Nanomaterials
Bitumen Modification
Differential Scanning Calorimetry
Moisture Sensitivity
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