Abstract
It is of great benefit to the environment and the economy to use discarded tires pyrolysis carbon black (TPCB) nanoparticles as a modifier for asphalt binders. A base asphalt binder with 60/80 penetration (GF-70) was selected to prepare the TPCB-modified asphalt binder (TPCB/GF-70) with a 15% dosage of TPCB by the melt blending method. The test instruments, such as Fourier transform infrared spectroscopy, laser particle size analyzer, and thermogravimetric analyzer, were used to study the characteristics of TPCB. The physical performance of GF-70 and TPCB/GF-70 were tested and the rheological properties were also tested with a dynamic shear rheometer to investigate TPCB’s effect on the performance of GF-70. In addition, the aromatic hydrocarbon oil (AHO) was used as the softening agent for TPCB/GF-70. The pavement performance of AC-13 and AC-20 was studied to evaluate the comprehensive effect of TPCB and AHO on the pavement performance of asphalt mixtures. Results show that a 15% dosage of TPCB can significantly improve the anti-rutting performance of GF-70, and decrease the low-temperature performance of GF-70 within one PG grade. AHO can obviously improve the low-temperature performance of TPCB/GF-70, but does not significantly decrease the high-temperature performance. With the addition of AHO and a 0.1% higher oil aggregate ratio, TPCB tends to significantly improve the anti-rutting performance and the low-temperature performance of TPCB-modified mixtures; the moisture stability of TPCB and AHO composite modified mixtures satisfies the requirement of water stability.
Highlights
With the rapidly increase of automobiles and trucks, more than 1.5 billion waste tires are discarded every year [1]
The modified effects of tires pyrolysis carbon black (TPCB) on the performance of asphalt binders or its mixtures may be different to industrial carbon blacks, so it is of great importance to investigate the TPCB effect on the pavement performance of asphalt binders and their mixtures
TPCB and aromatic hydrocarbon oil (AHO) compound modifier modified asphalt was produced as follows: GF-70 was heated to a constant temperature of 155 ◦ C, the designed dosages of AHO and TPCB were added to neat asphalt, and a high-speed shearing machine was used for 45 min, with a shear temperature of 155 ◦ C and a shear rate of 4000 r/min
Summary
With the rapidly increase of automobiles and trucks, more than 1.5 billion waste tires are discarded every year [1]. Previous research investigated the modified effect of CB on the workability or mechanical properties of asphalt binders and their mixtures, with the results indicating that CB had good compatibility with asphalt binders and a reinforcement effect on asphalt binders, and decreased the resistivity of asphalt [12]; it could improve the complex modulus [13] and anti-aging performance (ultraviolet aging and thermo-oxidative aging) of asphalt binders [15], as well as enhance the anti-rutting performance of asphalt mixtures at high temperatures [14]. The modified effects of TPCB on the performance of asphalt binders or its mixtures may be different to industrial carbon blacks, so it is of great importance to investigate the TPCB effect on the pavement performance of asphalt binders and their mixtures. Two kinds of asphalt mixtures of AC-13 and AC-20 were created to investigate the influence of TPCB on the pavement performance of asphalt mixtures
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