Abstract
To determine and compare the fracture properties of different asphalt mixtures, single-edge notched beam (SENB) tests using three types of asphalt mixtures were applied in this study under the conditions of different notched depths and different temperatures. The effects of notched depths and temperatures on the fracture toughness and fracture energy were analyzed. The results indicate that the notch depth has no significant effects on the fracture toughness and the fracture energy, but the gradation has relatively obvious effects on the fracture energy, which the larger contents of course aggregate leads to increase the discreteness of the fracture energy of the specimen. The temperature has significant effects on the ultimate loads, fracture energy, and fracture toughness. The ultimate loads of the SENBs reach the peak value at 0°C, which could be resulted in that viscoelastic properties of asphalt mixture depend with temperatures. The fracture toughness at −20°C of continuously graded asphalt mixtures are higher than those of gap-graded asphalt mixtures. On the contrary, the fracture toughness of gap-graded asphalt mixtures is higher at temperatures from −10°C to 20°C. The fracture energy increases with temperatures, and the fracture energy of SMA-13 is significantly larger than those of AC-13 and AC-16.
Highlights
The fracture toughness of gap-graded asphalt mixtures is higher at temperatures from −10°C to 20°C. e fracture energy increases with temperatures, and the fracture energy of stone mastic asphalt (SMA)-13 is significantly larger than those of AC-13 and AC-16
A base asphalt SK90 was used in AC-13 and AC16, and a styrene-butadiene-styrene- (SBS-) modi ed asphalt binder produced by Shanxi Guolin Huatai Asphaltic Products Co., Ltd. was used in SMA-13. e properties of the base asphalt and the SBS-modi ed asphalt binder are shown in Tables 1 and 2, respectively
For AC-16 and SMA-13, there is no obvious regularity of the notch depth versus the fracture energy. e contents of ne aggregate of AC-16 and SMA-13 are relatively small, and the contents aggregate are relatively large, which results in increasing the discreteness of the fracture energy of the specimen
Summary
Sieve size (mm) Figure 1: Experimental gradation curves for 0.45 power gradation graph. Test item Penetration (25°C, 5 s, 100 g) Ductility (5°C, 5 cm/min) Softening point (R&B). One kind of viscoelastic materials, the fracture characteristics are related to the initial crack depth and to the temperature. Erefore, the aim of this study was to determine and compare the fracture properties of three typical surface layer asphalt mixtures, namely, two kinds of two continuously graded asphalt mixtures and a stone mastic asphalt (SMA), at di erent conditions of the initial crack depth and the temperature. Considering as the simple and widely used model, the SENB test was applied in this study and the SENB with di erent notched depths were tested at di erent temperatures
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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 call
