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Kang Zhao

Bio: Kang Zhao is an academic researcher from University of Science and Technology Beijing. The author has contributed to research in topics: Asphalt & Materials science. The author has an hindex of 1, co-authored 5 publications receiving 1 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the durability of materials is an essential measure to achieve the goal of perpetual pavement construction in China, and the authors propose a method to ensure the durability and sustainability of materials.
Abstract: Perpetual pavement has become an important research area of highway development in China. Ensuring the durability of materials is an essential measure to achieve the goal of perpetual pavement cons...

11 citations

Journal ArticleDOI
TL;DR: In this article, the authors adopted the full-scale accelerated loading test system to comprehensively characterize dynamic response of asphalt pavement in both dry and saturated conditions based on the strict control of loading vehicle's path.

8 citations

Journal ArticleDOI
TL;DR: In this article , lignin and carbon fiber were used as modifiers to study their effects on the road performance of asphalt mastic. But they did not have an advantageous effect on fatigue and low temperature cracking resistance, and the fitting results of the four-parameter Burgers model show that the use of fiber modification decreases the proportion of elasticity and viscous creep compliance but increases the delayed elasticity part.
Abstract: Fiber materials as an asphalt mixture additive and stabilizer can effectively improve the performance index of asphalt pavement. In this study, lignin and carbon fiber were used as modifiers to study their effects on the road performance of asphalt mastic. Based on the frequency sweep, linear amplitude sweep (LAS) and multi-stress creep recovery (MSCR) experiments were conducted to test the high-temperature rutting and medium-temperature fatigue resistance of asphalt mastic with different fiber incorporation and low-temperature performance tests based on bending beam rheometer (BBR). The results indicate that adding fibers increased the stiffness of the asphalt mastic, and the modification effect of lignin fibers was better than that of carbon fibers. Meanwhile, the characteristic flow index of the asphalt mastic gradually increased with the increase in temperature, indicating that it gradually became a near-Newtonian fluid at higher temperatures. The addition of fibers also improved the high temperature rutting resistance of the asphalt mastic but did not have an advantageous effect on fatigue and low temperature cracking resistance. Additionally, the fitting results of the four-parameter Burgers model show that the use of fiber modification decreases the proportion of elasticity and viscous creep compliance but increases the delayed elasticity part.

5 citations

Journal ArticleDOI
TL;DR: In this article, a new wave velocity measurement method, the arbitrary wave (AW) method, is proposed and designed to measure the acoustic emission wave velocity of an asphalt mixture, which is compared with the pencil lead break (PLB) method and the automatic sensor test (AST) method.
Abstract: The wave velocity of acoustic emission (AE) can reflect the properties of materials, the types of AE sources and the propagation characteristics of AE in materials. At the same time, the wave velocity of AE is also an important parameter in source location calculation by the time-difference method. In this paper, a new AE wave velocity measurement method, the arbitrary wave (AW) method, is proposed and designed to measure the AE wave velocity of an asphalt mixture. This method is compared with the pencil lead break (PLB) method and the automatic sensor test (AST) method. Through comparison and analysis, as a new wave velocity measurement method of AE, the AW method shows the following advantages: A continuous AE signal with small attenuation, no crosstalk and a fixed waveform can be obtained by the AW method, which is more advantageous to distinguish the first arrival time of the acoustic wave and calculate the wave velocity of AE more accurately; the AE signal measured by the AW method has the characteristics of a high frequency and large amplitude, which is easy to distinguish from the noise signal with the characteristics of a low frequency and small amplitude; and the dispersion of the AE wave velocity measured by the AW method is smaller, which is more suitable for the measurement of the AE wave velocity of an asphalt mixture.

2 citations

Journal ArticleDOI
01 Apr 2021
TL;DR: In this paper, the authors used the finite element (FE) software ABAQUS to simulate the temperature field of asphalt pavement in summer and winter, and then introduced into the thermal mechanical coupling analysis.
Abstract: In order to study the influence of the actual temperature field of asphalt pavement on the fracture characteristics of asphalt pavement structure, the finite element(FE) software ABAQUS is used to simulate the temperature field of asphalt pavement in summer and winter, and then the temperature field corresponding to specific time period is introduced into the thermal mechanical coupling analysis. The effects of different loading speeds (10, 20 m/s) and different loads sizes (0.7, 1.2 MPa) on the stress intensity factors (SIF) of top-down (longitudinal) and base reflective (transverse) cracks were studied, and the crack propagation characteristics were discussed. It is found that in summer, the top-down cracks in the surface layer mainly propagate in mode II, and the value increases with the increase of load. In winter, the low temperature promotes the propagation of mode I crack, and the sign of K? value in winter is opposite to that in summer. For the reflection crack of base course, the coupled field promotes the propagation of mode II crack at high temperature in summer. However, in winter, the base is prone to mode I expansion, and increases with the increase of load. When there is no coupling field, the speed has little effect on crack propagation, but the location of SIF peak value changes in time. In the coupled field, the SIF value increases with the decrease of speed. Therefore, considering the real temperature field, heavy load and slow speed have the greater damage to the pavement.

2 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the state-of-the-art studies on asphalt volatile organic compounds emission reduction are summarized and analyzed, and the emission reduction mechanisms of different emission reduction agents are illustrated.

22 citations

Journal ArticleDOI
TL;DR: In this article , a unified fatigue parameter was proposed to evaluate the fatigue resistance and optimize the crumb rubber content of SBS/CR composite modified asphalt (CMA) binders under two control modes.

15 citations

Journal ArticleDOI
TL;DR: In this article , the authors discuss the challenges of incorporating recycled plastics into bitumen/asphalt in terms of plastic selection, chemical compatibility, long-term performance and potential contributions to fuming, microplastic pollution and contaminant leaching.
Abstract: Although various polyolefins have intermittently been used for making roads since the 1980s, the recycling of plastic waste into roads raises new challenges related to the production, performance and durability of plastic-modified asphalt. This review critically discusses the challenges of incorporating recycled plastics into bitumen/asphalt in terms of plastic selection, chemical compatibility, long-term performance and potential contributions to fuming, microplastic pollution and contaminant leaching. Recent advances in the field are also presented and recommendations for future work to address current research and industrial gaps are suggested. Challenges related to the construction of plastic roads include the wide variability in the plastic composition and its properties after recycling, which not only affect the successful incorporation of plastic in bitumen but also impact the mechanical properties and environmental impact of the roads. The lack of representative testing procedures prevents an accurate understanding of the short- and long-term performance of plastic roads in real conditions and the contribution of plastic roads to fuming and microplastic release remains unclear. However, promising laboratory-based procedures have been developed to benchmark the release of polyaromatic hydrocarbons and volatile organic compounds, as well as microplastics, from recycled plastic-modified asphalt against conventional polymer-modified asphalts. Standards are still required to facilitate bitumen/asphalt modification by recycled plastics, meet the needs of bitumen/asphalt manufacturers and convince local authorities to foster the construction of plastic roads if proven to be a sustainable practice. © 2022 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.

10 citations

Journal ArticleDOI
TL;DR: In this article , the effect of freeze-thaw cycles on the pavement performance of SBS modified asphalt mixture (SBSMA) and SBS/crumb rubber composite modified asphalt (CCRMA) was studied using a triaxial repeated creep test, semicircular bending fatigue test based on digital image correlation (DIC), and thermal stress restrained specimen test.

7 citations

Journal ArticleDOI
TL;DR: In this paper , the influence of novel rubber-modified pellets (RMP) on the performance of open-grade friction courses (OGFC) asphalt mixtures and its improving mechanism was investigated.

4 citations