Research on the Rheological Characteristics and Aging Resistance of Asphalt Modified with Tourmaline

Abstract

Tourmaline modified asphalt (TMA) binders were prepared with different modifier types and contents in this research. The routine properties, rheological properties, and aging resistance were evaluated to research the function of tourmaline on the performances of asphalt binders. Test results show that the storage stability can be improved significantly by the smaller particle size and negative-ion treated surface of tourmaline modifier. It indicates that the stiffness and rutting-resistance of TMA binder can be enhanced significantly, and the elastic component of the viscoelastic characteristic can also be increased. Moreover, the complex viscosity and the Zero Shear Viscosity (ZSV) values of tourmaline modified asphalt are increased within the test frequency range, which results in the improvement of deformation resistance of tourmaline modified asphalt. When mixed with asphalt, the tourmaline modifier maintains a two-phase structure, which results in the good rheological property for tourmaline modified asphalt.Materials 2020, 13, 69 2 of 13 powder on the performance of asphalt binders were studied [22]. The influence of calcium carbide modifier on the performances of pavement was emphatically studied [23,24]. The effects of tourmaline on asphalt density, dynamic stability, and flow value were analyzed, and the micro-mechanism of tourmaline modified asphalt was also studied [25][26][27][28]. Organic tourmaline exhibits excellent storage stability due to its reduced surface polarity, which pioneer a new way for the development of mineral and copolymer composites [29]. Çelikbilek et al. evaluated the performances of Tourmaline modified asphalt (TMA) mixture by the means of Grey multi-criteria evaluation model. It was indicated that the model had good reliability and practicability in TMA mixture, which can provide a new theoretical basis for the widely application of TMA [30].The utilization of tourmaline in relative fields has become more and more popular. However, the comprehensive research on the properties of TMA and its mixture is still limited. The main work of this research is to study the properties of TMA under different modifier types and contents. The influences of tourmaline on storage stability, rheological characteristics, aging resistance, and microscope structure of TMA are all analyzed by various experiment methods.

Enhancing the Functional and Environmental Properties of Asphalt Binders and Asphalt Mixtures Using Tourmaline Anion Powder Modification

“…There are two main preparation methods for tourmaline-modified asphalt binder, denoted herein as TMA. Compared to the surface modification method, TMA prepared using the mechanical method, namely, the high-speed shear blending method, are susceptible to interfacial separation between the asphalt binder and the tourmaline during storage and construction [27,29].…”

“…The introduction of MnO 2 to Fe 3 O 4 /CuO nanoparticles was found to enhance the surface area and pore structure to achieve color removal of the fluid [33]. Ye et al [29] studied the effects of tourmaline on the zero-shear viscosity (ZSV) of modified asphalt binders. Furthermore, it was observed from the study [29] that the quantitative value of ZSV increased as the dosage of TP increased.…”

“…Ye et al [29] studied the effects of tourmaline on the zero-shear viscosity (ZSV) of modified asphalt binders. Furthermore, it was observed from the study [29] that the quantitative value of ZSV increased as the dosage of TP increased. From the study findings, it was also observed that TP and TAP modification had a comparable influence on the asphalt binders and asphalt mixtures, respectively.…”

Study on Aging Mechanism and High-Temperature Rheological Properties of Low-Grade Hard Asphalt

“…Studies conducted by Li [ 11 ] and Cao et al [ 12 ] demonstrate the impact of RTFOT, PAV, and UV aging tests on the fundamental properties of asphalt. Several researchers argue that analyzing the high-temperature performance of asphalt through its rheological properties is more scientifically rigorous [ 13 , 14 ]. The dynamic shear rheological (DSR) test is utilized to investigate the high-temperature rheological properties of asphalt, while the rutting factor (G*/sinδ) serves as an indicator for evaluating its high-temperature performance [ 15 , 16 ].…”