Rice Husk Ash-Bitumen Modification as Sustainable Road Pavement Materials
Authors: *Ako, T. And Mangai, V.E.
DOI Info: http://doi.org/10.5281/zenodo.21046854
ABSTRACT
In recent times, there has been diverse research in finding alternatives or improving the existing bitumen through the utilization of industrial and agricultural wastes due to the demand for green road materials. In this study, the role of rice husk ash (RHA) as a modifier of bitumen for improving the performance of flexible pavements was investigated. The various mechanical properties of bitumen containing different percentages of RHA (0, 2, 4, 6, and 8%) such as penetration, softening point, viscosity, flash, and fire points, loss on heating, and specific gravity were examined. The results show that the penetration decreased from 65 to 46.3 mm, softening point increased from 35 to 42.5 oC, and the viscosity increased drastically from 283 to 1395 seconds at 100 oC using tar viscometer. It was observed that the weight loss on heating decreases, which indicates high thermal stability, and there was an increase in flash and fire points. Thus, it was concluded that adding RHA increases the strength of bitumen and makes it more resistant to temperature variations, making it a promising modifier for sustainable pavement construction. RHA-modified bitumen was recommended for eco-friendly road construction, especially in tropical regions where bitumen performance is affected by temperature and moisture variations.
Affiliations: Department of Civil Engineering, University of Jos, Nigeria.
Keywords: Agricultural Wastes, Bitumen Modifiers, Construction Materials, Rice Husk Ash, Sustainable Roads
Published date: 2026/06/30
