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A method was developed for solving the relaxation modulus of high viscosity asphalt sand (HVAS) based on the three-point bending creep test, and was verified by comparison with experimental results. In this method, firstly, a transcendental equation was obtained by the convolution, and then equations were obtained by Taylor’s formula, which were solved by Mathmatica to obtain the relaxation modulus by Newton’s method. Subsequently, the laboratory investigations of the viscoelastic parameters of the Burgers model for the HVAS by three-point bending creep tests were carried out. In addition, the method was verified by comparing the relaxation moduli with the indoor relaxation experiments. Results showed that the numerical calculation and the test data were in good agreement, and the relaxation characteristics of the HVAS were reflected more accurately. The method can be used to study the relaxation characteristics of the asphalt mixtures effectively. In addition, this study provides a research basis for road crack prevention.
Yazhen Sun; Zhangyi Gu; Jinchang Wang; Xuezhong Yuan. Research of Method for Solving Relaxation Modulus Based on Three-Point Bending Creep Test. Materials 2019, 12, 2021 .
AMA StyleYazhen Sun, Zhangyi Gu, Jinchang Wang, Xuezhong Yuan. Research of Method for Solving Relaxation Modulus Based on Three-Point Bending Creep Test. Materials. 2019; 12 (12):2021.
Chicago/Turabian StyleYazhen Sun; Zhangyi Gu; Jinchang Wang; Xuezhong Yuan. 2019. "Research of Method for Solving Relaxation Modulus Based on Three-Point Bending Creep Test." Materials 12, no. 12: 2021.
To study the dynamic response of saturated asphalt pavement under moving load and temperature load, 3-D finite element models for asphalt pavements with hydro-mechanical coupling and thermal-hydro-mechanical coupling were built based on the porous media theory and Biot theory. First, the asphalt pavement structure was considered as an ideal saturated fluid⁻solid biphasic porous medium. Following this, the spatial distribution and the change law of the pore-water pressure with time, the transverse stress, and the vertical displacement response of the asphalt pavement under different speeds, loading times, and temperatures were investigated. The simulation results show that both the curves of the effective stress and the pore-water pressure versus the external loads have similar patterns. The damage of the asphalt membrane is mainly caused by the cyclic effect of positive and negative pore-water pressure. Moreover, the peak value of pore-water pressure is affected by the loading rate and the loading time, and both have positive exponential effects on the pore-water pressure. In addition, the transverse stress of the upper layer pavement is deeply affected by the temperature load, which is more likely to cause as transverse crack in the pavement, resulting in the formation of temperature cracks on the road surface. The vertical stress at the middle point in the upper layer of the saturated asphalt pavement, under the action of the temperature load and the driving load, shows a single peak.
Yazhen Sun; Rui Guo; Lin Gao; Jinchang Wang; Xiaochen Wang; Xuezhong Yuan. Study on Dynamic Response Characteristics of Saturated Asphalt Pavement under Multi-Field Coupling. Materials 2019, 12, 959 .
AMA StyleYazhen Sun, Rui Guo, Lin Gao, Jinchang Wang, Xiaochen Wang, Xuezhong Yuan. Study on Dynamic Response Characteristics of Saturated Asphalt Pavement under Multi-Field Coupling. Materials. 2019; 12 (6):959.
Chicago/Turabian StyleYazhen Sun; Rui Guo; Lin Gao; Jinchang Wang; Xiaochen Wang; Xuezhong Yuan. 2019. "Study on Dynamic Response Characteristics of Saturated Asphalt Pavement under Multi-Field Coupling." Materials 12, no. 6: 959.
The stress-absorption layer in cement concrete pavement delays the development of reflection cracks and is good at fatigue resistance. Laboratory investigations of the anti-crack performance of the high viscous asphalt sand stress-absorption layer (HVASAL) and rubber asphalt stress-absorption layer (RASAL) were carried out by force-controlled fatigue crack propagation tests, for which three types of overlay structures with three types of pre-crack (i.e., the middle crack, the side crack, and the 45° inclined crack) were designed. A probability model was established to describe the propagation of the fatigue cracks. The fatigue crack propagation, the fatigue life, the crack propagation rate, and the crack propagation mechanism of the three types of overlay structure were compared and analyzed. The results show that the stress-absorption layers have good anti-crack fatigue performance, and that the RASAL is better than the HVASAL. The crack propagation patterns of the three types of overlay structure were found. In the double logarithmic coordinate, the curves of the three types of cracks are straight lines with different intercepts and slopes. The probability model quantifies the relationship between the crack propagation rate and ∆K. The influences of the three types of crack on the fatigue properties of the asphalt overlays are different.
Yazhen Sun; Ting Yan; Changyu Wu; Xiaofang Sun; Jinchang Wang; Xuezhong Yuan. Analysis of the Fatigue Crack Propagation Process of the Stress-Absorption Layer of Composite Pavement Based on Reliability. Applied Sciences 2018, 8, 2093 .
AMA StyleYazhen Sun, Ting Yan, Changyu Wu, Xiaofang Sun, Jinchang Wang, Xuezhong Yuan. Analysis of the Fatigue Crack Propagation Process of the Stress-Absorption Layer of Composite Pavement Based on Reliability. Applied Sciences. 2018; 8 (11):2093.
Chicago/Turabian StyleYazhen Sun; Ting Yan; Changyu Wu; Xiaofang Sun; Jinchang Wang; Xuezhong Yuan. 2018. "Analysis of the Fatigue Crack Propagation Process of the Stress-Absorption Layer of Composite Pavement Based on Reliability." Applied Sciences 8, no. 11: 2093.
Laboratory predictions for the fatigue life of an asphalt mixture under cyclic loading based on the plateau value (PV) of the permanent deformation ratio (PDR) were carried out by three-point bending fatigue tests. The influence of test conditions on the recovery ratio of elastic deformation (RRED), the permanent deformation (PD) and PDR, and the trends of RRED, PD, and PDR were studied. The damage variable was defined by using PDR, and the relation of the fatigue life to PDR was determined by analyzing the damage evolution process. The fatigue equation was established based on the PV of PDR and the fatigue life was predicted by analyzing the relation of the fatigue life to the PV. The results show that the RRED decreases with the increase of the number of loading cycles, and the elastic recovery ability of the asphalt mixture gradually decreases. The two mathematical models proposed are based on the change laws of the RRED, and the PD can well describe the change laws. The RRED or the PD cannot well predict the fatigue life because they do not change monotonously with the fatigue life, and one part of the deformation causes the damage and the other part causes the viscoelastic deformation. The fatigue life decreases with the increase of the PDR. The average PDR in the second stage is taken as the PV, and the fatigue life decreases in a power law with the increase of the PV. The average relative error of the fatigue life predicted by the fatigue equation to the test fatigue life is 5.77%. The fatigue equation based on PV can well predict the fatigue life.
Yazhen Sun; Chenze Fang; Jinchang Wang; Xuezhong Yuan; Dong Fan. Method of Fatigue-Life Prediction for an Asphalt Mixture Based on the Plateau Value of Permanent Deformation Ratio. Materials 2018, 11, 722 .
AMA StyleYazhen Sun, Chenze Fang, Jinchang Wang, Xuezhong Yuan, Dong Fan. Method of Fatigue-Life Prediction for an Asphalt Mixture Based on the Plateau Value of Permanent Deformation Ratio. Materials. 2018; 11 (5):722.
Chicago/Turabian StyleYazhen Sun; Chenze Fang; Jinchang Wang; Xuezhong Yuan; Dong Fan. 2018. "Method of Fatigue-Life Prediction for an Asphalt Mixture Based on the Plateau Value of Permanent Deformation Ratio." Materials 11, no. 5: 722.
Laboratory investigations of relaxation damage properties of high viscosity asphalt sand (HVAS) by uniaxial compression tests and modified generalized Maxwell model (GMM) to simulate viscoelastic characteristics coupling damage were carried out. A series of uniaxial compression relaxation tests were performed on HVAS specimens at different temperatures, loading rates, and constant levels of input strain. The results of the tests show that the peak point of relaxation modulus is highly influenced by the loading rate in the first half of an L-shaped curve, while the relaxation modulus is almost constant in the second half of the curve. It is suggested that for the HVAS relaxation tests, the temperature should be no less than −15°C. The GMM is used to determine the viscoelastic responses, the Weibull distribution function is used to characterize the damage of the HVAS and its evolution, and the modified GMM is a coupling of the two models. In this paper, the modified GMM is implemented through a secondary development with the USDFLD subroutine to analyze the relaxation damage process and improve the linear viscoelastic model in ABAQUS. Results show that the numerical method of coupling damage provides a better approximation of the test curve over almost the whole range. The results also show that the USDFLD subroutine can effectively predict the relaxation damage process of HVAS and can provide a theoretical support for crack control of asphalt pavements.
Yazhen Sun; Zhangyi Gu; Jinchang Wang; Chenze Fang; Xuezhong Yuan. Study on Relaxation Damage Properties of High Viscosity Asphalt Sand under Uniaxial Compression. Advances in Civil Engineering 2018, 2018, 1 -12.
AMA StyleYazhen Sun, Zhangyi Gu, Jinchang Wang, Chenze Fang, Xuezhong Yuan. Study on Relaxation Damage Properties of High Viscosity Asphalt Sand under Uniaxial Compression. Advances in Civil Engineering. 2018; 2018 ():1-12.
Chicago/Turabian StyleYazhen Sun; Zhangyi Gu; Jinchang Wang; Chenze Fang; Xuezhong Yuan. 2018. "Study on Relaxation Damage Properties of High Viscosity Asphalt Sand under Uniaxial Compression." Advances in Civil Engineering 2018, no. : 1-12.