Abstract
Sustainable materials in the field of road pavement have become a research direction in recent years. In this study, the rice husk ash with small dosage of styrene‐butadiene‐styrene (SBS) was added as a bioadditive into the base asphalt to modify its properties. Different contents (0, 2, 5, 10, and 15%) of rice husk ash (RHA) and 1% of SBS were selected to prepare the modified asphalt. Penetration, softening point, ductility, rotational viscosity test, and temperature sweep test were conducted to investigate the properties of SBS/RHA‐modified asphalt binder. Rutting test, moisture susceptibility, and low‐temperature cracking were utilized to evaluate the performances of SBS/RHA‐modified asphalt mixture. The results showed that the penetration decreased and the softening point and rotational viscosity enhanced while the ductility slightly decreased with the incorporation of rice husk ash. The SBS/RHA‐modified asphalt mixture had better high‐temperature performance than that of the virgin asphalt mixture but slightly lower moisture stability and low temperature performance. The tensile strength ratio of the virgin and modified asphalt mixture met the requirement of specification. The tensile strain of mixture SR15 was lower than the requirement for the asphalt mixtures on the basis of the specification. For the SBS/RHA‐modified asphalt binder based on the comprehensive properties, the content of rice husk ash should not be higher than 15%.
Highlights
Rice is the basic source of food consumption in the world [1, 2]; every year, it is produced in large quantities worldwide
The RHA was taken directly from the furnace and scattered in the tray to be cooled at room temperature. e cooled RHA was wetgrinded in a vertical square ball mill for 15 minutes and the high active rice husk ash was obtained. e RHA used in this study was sieved by the 0.075 mm aperture-sized sieve
For the penetration, softening point, ductility tests, the asphalt binder used in these tests were the unaged and rolling thin film oven (RTFO)-aged binder
Summary
Rice is the basic source of food consumption in the world [1, 2]; every year, it is produced in large quantities worldwide. China is the largest producer of rice in the world, and the average yearly production of rice in China is about 200 million tons [3]. A by-product called rice husk ash (RHA) is generated by the rice milling. Weiting et al explored the structure of rice husk ash from nano- and microlevel, revealed the origin of high pozzolanic activity and specific surface area, and obtained the optimum combustion temperature for the highly reactive RHA [14]. Holzschuh et al incorporated the RHA in the molten aluminum and analyzed the chemical
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
