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To improve the durability of asphalt pavement with heavy traffic conditions in cold regions, the parameter optimization of graded macadam transitional layer (GMTL) for the inverted asphalt pavement based on the mechanical response and the strength standard was studied. The stress distribution laws of GMTL were studied with different loads by means of BISAR3.0. The influences of the thickness and the modulus of GMTL on the pavement stress were analyzed. The optimal thickness and the modulus range of the GMTL were determined. Combined with a self-developing real-time data acquisition and a processing system for aggregate attitude (RDAPS), the strength control standard of the GMTL was established. Finally, the performance of the optimized inverted asphalt pavement structure was verified through the MEPDG design method. The results show that the tensile stress at the bottom of the surface layer reduced by about 58%, and the shear stress in GMTL increased by about 17% when the modulus of GMTL increases from 300 MPa to 800 MPa. However, the change in modulus has no significant influence on the maximum shear stress in the asphalt surface layer and the tensile stress in the base layer bottom. When the thickness of GMTL increases from 12 cm to 20 cm, the tensile stress in the bottom of the base layer reduced by about 31%. Based on the mechanical results from simulation calculation and the technical indicator required in the field, the recommended optimal parameters of GMTL are the modulus of 700 MPa and the thickness of 18 cm. In addition, the spatial attitude angle ΦN of wireless intelligent attitude aggregate (WIAA), the compressive strength Rc standard, and the California Bearing Ratio (CBR) standard were analyzed, and the strength control standard of inverted asphalt pavement with GMTL was proposed, namely, CBR ≥ 354%, Rc ≥ 1.06 MPa, and ΦN ≤ 3°. A significant improvement in the resistance to crack can be seen in the inverted asphalt pavement when the optimized structure was applied. Taking the 20-year service life as an example, the top-down cracks reduced by 29.3% and the bottom-up cracks reduced by 32.6% in comparison to the original structure. The recommended structural parameters of GMTL could be used to guide the construction and design of inverted asphalt pavement in cold regions.
Chen Zhang; Yong Lei. Parameter Optimization of Graded Macadam Transitional Layer for Inverted Asphalt Pavement Based on the Mechanical Response and Strength Standard. Advances in Materials Science and Engineering 2021, 2021, 1 -11.
AMA StyleChen Zhang, Yong Lei. Parameter Optimization of Graded Macadam Transitional Layer for Inverted Asphalt Pavement Based on the Mechanical Response and Strength Standard. Advances in Materials Science and Engineering. 2021; 2021 ():1-11.
Chicago/Turabian StyleChen Zhang; Yong Lei. 2021. "Parameter Optimization of Graded Macadam Transitional Layer for Inverted Asphalt Pavement Based on the Mechanical Response and Strength Standard." Advances in Materials Science and Engineering 2021, no. : 1-11.
Thermal cracking is one of the most noteworthy distresses in asphalt concrete (AC) pavements. It is caused by the thermal stress in pavement layers, when air temperatures are extremely low or change rapidly. This paper aims to mine multiple association rules for thermal cracking in seasonal freezing zones. Relevant data on thermal cracking, including 36 potential influence factors, were collected from 339 samples from 46 Long-Term Pavement Performance (LTPP) sections in 6 US states and 3 Canadian provinces. Grey Relational Analysis was used to identify the most significant elements among these 36 factors as inputs for an Apriori algorithm, which was implemented to explore the association rules among the key influence factors. Results showed that the asphalt binder percentage, measured stiffness (PG + 4 240s) from BBR testing, monthly freezing index, AC layer thickness, service age and Annual Average Daily Traffic (AADT) all exhibited significant influences on thermal cracking, and the proposed indicator, the thermal cracking development rate (TCDR), had different levels of strong associations with these significant influence factors. All six factors were taken into account for mining association rules. Based on these association rules, recommendations for pavement design, construction and management are provided to prolong the service life of pavements.
Shi Dong; Jian Zhong; Peiwen Hao; Wenjin Zhang; Jun Chen; Yong Lei; Adam Schneider. Mining multiple association rules in LTPP database: An analysis of asphalt pavement thermal cracking distress. Construction and Building Materials 2018, 191, 837 -852.
AMA StyleShi Dong, Jian Zhong, Peiwen Hao, Wenjin Zhang, Jun Chen, Yong Lei, Adam Schneider. Mining multiple association rules in LTPP database: An analysis of asphalt pavement thermal cracking distress. Construction and Building Materials. 2018; 191 ():837-852.
Chicago/Turabian StyleShi Dong; Jian Zhong; Peiwen Hao; Wenjin Zhang; Jun Chen; Yong Lei; Adam Schneider. 2018. "Mining multiple association rules in LTPP database: An analysis of asphalt pavement thermal cracking distress." Construction and Building Materials 191, no. : 837-852.
The demand for bituminous materials is continuously growing; crude oil-based asphalt binders are non-renewable, and are facing rapid depletion. With the increase of petroleum-based asphalt prices, seeking an alternative, renewable material such as bio-asphalt has become a hot research topic. However, shortcomings in this research area have been identified, notably concerning the high-temperature performance of bio-asphalt at present. This research aims to comprehensively apply conventional tests to, and study the rheological behavior of, the high-temperature performances of bio-asphalt binders, i.e., by temperature and frequency sweeps, using a dynamic shear rheometer (DSR). It will also assess the chemical functional groups of specimens prepared by different aging conditions. Fifty penetration grade base asphalt binder (50#), bio-oil modified asphalt binders with 0%, 5%, 10%, and 30% bio-oil contents by mass, and bio-oil modified asphalt binder with combinations of 5% bio-oil-1% SBS, and 10% bio-oil-1% SBS were used in this study. The conventional performance of bio-asphalt binders was tested using penetration, ductility, and softening point, before and after short-term aging conditioning. The temperature sweep and frequency sweep of bio-asphalt under different bio-oil contents were carried out via DSR. Two-logarithmic equations of rutting factor and temperature were established, and the temperature sensitivity of bio-asphalt was analyzed. The master curves of virgin asphalt and bio-asphalt were constructed at 64 °C. The results indicate that the incorporation of bio-oil reduced the anti-rutting performance of asphalt, and the bio-oil content had a significant effect on the mass loss of the bio-asphalt binder. The performance of bio-oil modified asphalt binders using 5% bio-oil, 5% bio-oil-1% SBS, and 10% bio-oil-1% SBS, could meet the requirements of 50# grade asphalt. The temperature sensitivity of bio-asphalt did not show obvious change before and after short-term aging, whereas the temperature sensitivity of bio-asphalt with 5% bio-oil was relatively small. With an increase in temperature, the phase angle increased gradually. In contrast, the storage modulus, loss modulus, and complex modulus decreased progressively. The complex modulus and rutting factor of bio-asphalt with 5% bio-oil steadily increased with the increase in testing frequency. Otherwise, chemical reactions were detected in the 50# base asphalt modified with the bio-oil.
Junfeng Gao; Hainian Wang; Zhanping You; Mohd Rosli Mohd Hasan; Yong Lei; Muhammad Irfan. Rheological Behavior and Sensitivity of Wood-Derived Bio-Oil Modified Asphalt Binders. Applied Sciences 2018, 8, 919 .
AMA StyleJunfeng Gao, Hainian Wang, Zhanping You, Mohd Rosli Mohd Hasan, Yong Lei, Muhammad Irfan. Rheological Behavior and Sensitivity of Wood-Derived Bio-Oil Modified Asphalt Binders. Applied Sciences. 2018; 8 (6):919.
Chicago/Turabian StyleJunfeng Gao; Hainian Wang; Zhanping You; Mohd Rosli Mohd Hasan; Yong Lei; Muhammad Irfan. 2018. "Rheological Behavior and Sensitivity of Wood-Derived Bio-Oil Modified Asphalt Binders." Applied Sciences 8, no. 6: 919.
Xiaodi Hu; Yong Lei; Hainian Wang; Pei Jiang; Xu Yang; Zhanping You. Effect of tack coat dosage and temperature on the interface shear properties of asphalt layers bonded with emulsified asphalt binders. Construction and Building Materials 2017, 141, 86 -93.
AMA StyleXiaodi Hu, Yong Lei, Hainian Wang, Pei Jiang, Xu Yang, Zhanping You. Effect of tack coat dosage and temperature on the interface shear properties of asphalt layers bonded with emulsified asphalt binders. Construction and Building Materials. 2017; 141 ():86-93.
Chicago/Turabian StyleXiaodi Hu; Yong Lei; Hainian Wang; Pei Jiang; Xu Yang; Zhanping You. 2017. "Effect of tack coat dosage and temperature on the interface shear properties of asphalt layers bonded with emulsified asphalt binders." Construction and Building Materials 141, no. : 86-93.
The hydraulic characteristics of pavement, such as pore water pressure, hydrodynamic pressure, and permeability, have a great influence on the functional performance and durability of pavement. The main objective of this study is to design a device for measuring the hydrodynamic pressure of pavement surface and analyze its characteristics with different vehicle speeds. In order to investigate the influence of vehicle speeds on the hydrodynamic pressure of pavement surface, a device equipped with five fiber Bragg grating (FBG) sensors was designed and utilized to measure the surface hydraulic characteristics at four vehicle speeds in the field. The calibration of FBG sensor was conducted by the interrogator (SmartScan Aero) under given pressures from 0 MPa to 1 MPa with an interval of 0.1 MPa. Then, the device was embedded in the pavement and compacted by an auto wheel, which traveled over the device at different speeds. Furthermore, the experimental data was collected by the interrogator during the process of a moving tire touching the surface of the device. The experimental results showed that the correlation coefficient between the given pressure and the center wavelength change of the FBG sensor was 0.99, which means the FBG sensor was accurate and reliable. The hydrodynamic pressure of the pavement surface increased with the increase in vehicle speed from 40 km/h to 100 km/h. Moreover, the directional anisotropy of the hydraulic pressure was found to be dependent on vehicle speed.
Yong Lei; Xiaodi Hu; Hainian Wang; Zhanping You; Yonglian Zhou; Xu Yang. Effects of vehicle speeds on the hydrodynamic pressure of pavement surface: Measurement with a designed device. Measurement 2016, 98, 1 -9.
AMA StyleYong Lei, Xiaodi Hu, Hainian Wang, Zhanping You, Yonglian Zhou, Xu Yang. Effects of vehicle speeds on the hydrodynamic pressure of pavement surface: Measurement with a designed device. Measurement. 2016; 98 ():1-9.
Chicago/Turabian StyleYong Lei; Xiaodi Hu; Hainian Wang; Zhanping You; Yonglian Zhou; Xu Yang. 2016. "Effects of vehicle speeds on the hydrodynamic pressure of pavement surface: Measurement with a designed device." Measurement 98, no. : 1-9.