EVALUATION OF HOT MIX ASPHALT AND BINDER PERFORMANCE MODIFIED WITH HIGH CONTENT OF NANO SILICA FUME | ||||
JES. Journal of Engineering Sciences | ||||
Article 2, Volume 49, No 4, July and August 2021, Page 378-399 PDF (691.65 K) | ||||
Document Type: Technical paper | ||||
DOI: 10.21608/jesaun.2021.70733.1046 | ||||
View on SCiNiTO | ||||
Authors | ||||
Ali Youssef Aboelmagd 1; Ghada S. Moussa 1; Mahmoud Enieb 1; Safwan Khedr2; El-Sayed M Abd Alla1 | ||||
1Department of Civil Engineering, Assiut University, Egypt | ||||
2Department of Construction Engineering, American University in Cairo, Egypt | ||||
Abstract | ||||
This research aims to evaluate the mechanical properties of hot asphalt mixtures prepared using modified asphalt binders with various contents of nano-silica fume (NSF). The modification to virgin bitumen is done by shear mixing with NSF at low contents (2, 4, 6, and 8%) and high contents (20, 30, 40, and 50%) with bitumen weight. The homogeneity of the modified asphalts was assessed using Scanning Electron Microscopy. The rotational viscosity, softening point, and penetration tests were used to evaluate the rheological-physical properties of the modified asphalt binders. The stiffness, moisture damage, rutting, and fatigue of the hot mixes prepared with NSF-modified binders were evaluated using Marshall, indirect tensile strength, and double punching tests. The results showed a significant improvement in the rheological-physical properties of the modified binders with high content compared to low content of NSF. Therefore, the modified binders with 30%, 40%, and 50% of NSF were selected to prepare NSF-modified mixtures. The results showed that asphalt mixtures incorporating 30, 40, and 50% NSF-modified binders were more resistant to moisture damage, rutting, and fatigue cracking compared to the control mixture. The novelty in this research is to produce a modified asphalt mixture with two-thirds a quantity of bitumen while achieving a high performance compared to the control mixture | ||||
Keywords | ||||
Silica fume; Moisture susceptibility; Double punching; Rutting; Fatigue | ||||
References | ||||
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