Abstract
The property of asphalt binder plays an important role in the performance of asphalt mixture. The natural rubber additive (NRA) was recommended as a modifier in the preparation of high viscosity asphalt (HVA) binder. Then, the gradation named LASTIKA‐13 was adopted to design the high viscosity asphalt mixture (HVAM) according to the orthogonal test analysis and the optimized gradation. The performance of the proposed HVAM was evaluated through a series tests including the permanent deformation at high temperature, moisture stability, low‐temperature cracks, and bending fatigue test. The results indicate that the proposed modified asphalt binder shows a comparable property with the conventional modified asphalt binder. The proposed HVAM with the NRA modifier has a superior performance to other conventional mixtures in the temperature susceptibility and resistance to moisture damage. Furthermore, the proposed HVAM was less sensitive to the temperature change and has good performance in terms of resistance to low‐temperature cracks, bonding characteristics, and fatigue behaviors.
Highlights
Xudong Hu,1,2 Sheng Li,3 Hui Yao,4 Hui Wang,3 Mei Xu,4 Dandan Cao,4 Mohd Rosli Mohd Hasan,5 Cong Duan,6 and Ran Zhang7
Different particle sizes of crumb rubber (CR) were investigated to analyze the influence on the performance of asphalt binders and mixtures, as well as the SBS with different molecular structures. is combination improved the cost-effectiveness of asphalt binders [21]. e polyurethane (PU) and rock asphalt (RA) were mixed into the asphalt to make the composite asphalt binder. e following mechanical tests were used to characterize the properties of modified asphalt binders with different PU and RA contents including the dynamic shear rheology (DSR), bending beam rheology (BBR), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermal gravity (TG) [22]
Stability, voids filled with asphalt (VFA), voids in the mineral aggregate (VMA), and volume of air voids (VV) based on the China specifications JTG E20—2011, which describes the determination steps of optimum asphalt content or optimum asphalt-aggregate ratio. e asphalt mixture with an AC-13 gradation was designed and mixed in order to further analyze the mixture performance of the recommended gradation LASTIKA-13 for comparisons. e SBS and natural rubber additive (NRA) modified asphalt binders and mixtures were used to mix with two gradations: LASTIKA-13 and AC-13. e symbols used in this project were explained as follows: the NRA modified asphalt mixture with the gradation AC-13 is named as AC-13-I, and the SBS modified asphalt mixture with the gradation AC-13 is named as AC-13-II
Summary
E natural rubber additive (NRA) was recommended as a modifier in the preparation of high viscosity asphalt (HVA) binder. A high viscosity asphalt mixture with the NRA modifier was prepared to understand the modification effect, and the properties of asphalt binders and mixtures were evaluated to simulate the field performance. E mixture performance was characterized including the Marshall stability, high- and low-temperature performance, moisture susceptibility, and fatigue performance to understand if the high viscosity asphalt binder and mixture can be of potential interest for the practical application in highway construction. E mixing temperature of modified asphalt binder is 165°C for the material preparation, and the NRA has a high viscosity and an excellent high-temperature stability. Parameters Penetration (25°C 100 g 5 s) Penetration index Softening point (ring & ball test) Ductility at 15°C Ductility at 25°C Kinematic viscosity (60°C) Solubility Density
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