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Chengdong Xia; Songtao Lv; Lingyun You; Dong Chen; Yipeng Li; Jianlong Zheng. Correction: Xia, C.; et al. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials 2019, 12, 889. Materials 2020, 13, 5393 .
AMA StyleChengdong Xia, Songtao Lv, Lingyun You, Dong Chen, Yipeng Li, Jianlong Zheng. Correction: Xia, C.; et al. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials 2019, 12, 889. Materials. 2020; 13 (23):5393.
Chicago/Turabian StyleChengdong Xia; Songtao Lv; Lingyun You; Dong Chen; Yipeng Li; Jianlong Zheng. 2020. "Correction: Xia, C.; et al. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials 2019, 12, 889." Materials 13, no. 23: 5393.
Road transportation is a basic need for mobility and daily life
Zhanping You; Jian-Long Zheng; Hainian Wang. Achievements and Prospects of Advanced Pavement Materials Technologies. Applied Sciences 2020, 10, 7743 .
AMA StyleZhanping You, Jian-Long Zheng, Hainian Wang. Achievements and Prospects of Advanced Pavement Materials Technologies. Applied Sciences. 2020; 10 (21):7743.
Chicago/Turabian StyleZhanping You; Jian-Long Zheng; Hainian Wang. 2020. "Achievements and Prospects of Advanced Pavement Materials Technologies." Applied Sciences 10, no. 21: 7743.
In order to further promote the development of functional pavement technology, a Special Issue of “Achievements and Prospects of Functional Pavement” has been proposed by a group of guest editors. To reach this objective, articles included in this Special Issue are related to different aspects of functional pavement, including green roads to decrease carbon emission, noise, and pollution, safety pavement to increase skid resistance by water drainage and snow removal, intelligent roads for monitoring, power generation, temperature control and management, and durable roads to increase service life with new theory, new design methods, and prediction models, as highlighted in this editorial.
Jian-Long Zheng; Zhanping You; Xueyan Liu. Achievements and Prospects of Functional Pavement: Materials and Structures. Applied Sciences 2020, 10, 7720 .
AMA StyleJian-Long Zheng, Zhanping You, Xueyan Liu. Achievements and Prospects of Functional Pavement: Materials and Structures. Applied Sciences. 2020; 10 (21):7720.
Chicago/Turabian StyleJian-Long Zheng; Zhanping You; Xueyan Liu. 2020. "Achievements and Prospects of Functional Pavement: Materials and Structures." Applied Sciences 10, no. 21: 7720.
Fatigue cracking is one of the main diseases that affect pavement durability. Understanding the relationship between the self-healing ability and fatigue life of asphalt materials from the molecular level will aid in the preventive maintenance and improvement of asphalt pavement. This work analyzes the research progress on the self-healing of asphalt and asphalt mixtures, including self-healing mechanism, influencing factors, evaluation methods, and improvement aspects. Factors affecting the self-healing performance are categorized as internal, such as molecular structure, asphalt motion and diffusion, asphalt viscoelasticity, and thixotropy, and external, such as humidity, temperature, induction conditions, and time. The self-healing performance can be adjusted by optimizing the chemical composition of the asphalt materials, changing the preparation method, and ensuring the spontaneous structure formation to achieve the intellectualization of the intrinsic material. This work sheds light on the design of materials and structures for durable pavement from the perspective of the self-healing behavior of asphalt materials.
Bo Liang; Fang Lan; Kai Shi; Guoping Qian; Zhengchun Liu; Jianlong Zheng. Review on the self-healing of asphalt materials: Mechanism, affecting factors, assessments and improvements. Construction and Building Materials 2020, 266, 120453 .
AMA StyleBo Liang, Fang Lan, Kai Shi, Guoping Qian, Zhengchun Liu, Jianlong Zheng. Review on the self-healing of asphalt materials: Mechanism, affecting factors, assessments and improvements. Construction and Building Materials. 2020; 266 ():120453.
Chicago/Turabian StyleBo Liang; Fang Lan; Kai Shi; Guoping Qian; Zhengchun Liu; Jianlong Zheng. 2020. "Review on the self-healing of asphalt materials: Mechanism, affecting factors, assessments and improvements." Construction and Building Materials 266, no. : 120453.
In order to describe the fatigue damage state of asphalt mixture more reasonably, direct tensile tests of the fatigue and the residual strength under stress levels of 1.00 MPa, 0.50 MPa and 0.25 MPa with five parallel tests were carried out. The trabecular specimens of AC-13C asphalt mixture (25 cm × 5 cm × 5 cm) were manufactured with Styrene-Butadiene-Styrene (SBS) modified asphalt, aggregate basalt and limestone mineral filler. The optimum asphalt-aggregate ratio was 5.2%. The dynamic modulus decay and the residual strength decay were termed as the damage variables to evaluate the fatigue damage process of asphalt mixtures, respectively. Based on the test results, the decay patterns of the dynamic modulus and the residual strength during fatigue tests under different stress states were revealed, and the model and the parameters of fatigue damage according to the corresponding decay patterns were obtained. Then, based on the assumption that the residual strength and dynamic modulus depend on the same damage state, the relationship between the two damage definitions was given, and the residual strength-dynamic modulus coupled model was established. The results showed that the residual strength-dynamic modulus coupled model could better describe the fatigue damage evolution law of asphalt mixture, and the parameter of this coupled model could be obtained by less residual strength tests. A modified formula for calculating the damage variables associated with residual strength and dynamic modulus was proposed based on the relationship between two kinds of damage variables.
Hongfu Liu; Xinyu Yang; Chengdong Xia; Jianlong Zheng; Tuo Huang; Songtao Lv. Nonlinear Fatigue Damage Model of Asphalt Mixture Based on Dynamic Modulus and Residual Strength Decay. Materials 2019, 12, 2236 .
AMA StyleHongfu Liu, Xinyu Yang, Chengdong Xia, Jianlong Zheng, Tuo Huang, Songtao Lv. Nonlinear Fatigue Damage Model of Asphalt Mixture Based on Dynamic Modulus and Residual Strength Decay. Materials. 2019; 12 (14):2236.
Chicago/Turabian StyleHongfu Liu; Xinyu Yang; Chengdong Xia; Jianlong Zheng; Tuo Huang; Songtao Lv. 2019. "Nonlinear Fatigue Damage Model of Asphalt Mixture Based on Dynamic Modulus and Residual Strength Decay." Materials 12, no. 14: 2236.
TiO2 pillared montmorillonite (T/M) modifiers have been studied to alleviate the aging of asphalt pavement and degrade automobile exhaust, but the photocatalytic activity of ordinary TiO2 is not good enough. In this study, in order to improve the photocatalytic performance of T/M, different metal (Ce, Cu, Fe) doped modifiers were prepared based on T/M. Metal doped TiO2 pillared montmorillonite was prepared by the sol-gel method. The modifier was characterized by X-ray diffraction (XRD) and an Ultraviolet visible (UV-Vis) spectrophotometer. The results show that TiO2 with different metal ions successfully entered into the layer of organic montmorillonite (OMMT) to form a pillared structure. Compared with the undoped TiO2 pillared montmorillonite (T/M), the optical absorption edge of the metal doped TiO2 pillared montmorillonite has an obvious red shift. In addition, the influences of the different content of modifiers on the properties of the original bitumen and catalytic capacities for automobile exhaust were also investigated. The results show that Ce doped TiO2 (Ce-T/M) pillared montmorillonite has the best improvement in high temperature performance and ultraviolet (UV) resistance of bitumen. In the experiment of automobile exhaust degradation, the degradation law of NO and HC showed Cu-T/M > Ce-T/M > Fe-T/M > T/M. These three kinds of metal ions can effectively improve the photocatalytic degradation efficiency of T/M.
Jiao Jin; Bozhen Chen; Lang Liu; Ruohua Liu; Guoping Qian; Hui Wei; Jianlong Zheng. A Study on Modified Bitumen with Metal Doped Nano-TiO2 Pillared Montmorillonite. Materials 2019, 12, 1910 .
AMA StyleJiao Jin, Bozhen Chen, Lang Liu, Ruohua Liu, Guoping Qian, Hui Wei, Jianlong Zheng. A Study on Modified Bitumen with Metal Doped Nano-TiO2 Pillared Montmorillonite. Materials. 2019; 12 (12):1910.
Chicago/Turabian StyleJiao Jin; Bozhen Chen; Lang Liu; Ruohua Liu; Guoping Qian; Hui Wei; Jianlong Zheng. 2019. "A Study on Modified Bitumen with Metal Doped Nano-TiO2 Pillared Montmorillonite." Materials 12, no. 12: 1910.
Although the rutting resistance, fatigue cracking, and the resistance to water and frost are important for the asphalt pavement, the strength of asphalt mixture is also an important factor for the asphalt mixture design. The strength of asphalt mixture is directly associated with the overall performance of asphalt mixture. As a top layer material of asphalt pavement, the strength of asphalt mixture plays an indispensable role in the top structural bearing layer. In the present design system, the strength of asphalt pavement is usually achieved via the laboratory tests. The stress states are usually different for the different laboratory approaches. Even at the same stress level, the laboratory strengths of asphalt mixture obtained are significantly different, which leads to misunderstanding of the asphalt mixtures used in asphalt pavement structure design. The arbitrariness of strength determinations affects the effectiveness of the asphalt pavement structure design in civil engineering. Therefore, in order to overcome the design deviation caused by the randomness of the laboratory strength of asphalt mixtures, in this study, the direct tension, indirect tension, and unconfined compression tests were implemented on the specimens under different loading rates. The strength model of asphalt mixture under different loading modes was established. The relationship between the strength ratio and loading rate of direct tension, indirect tension, and unconfined compression tests was adopted separately. Then, one unified strength model of asphalt mixture with different loading modes was established. The preliminary results show that the proposed unified strength model could be applied to improve the accurate degree of laboratory strength. The effectiveness of laboratory-based asphalt pavement structure design can therefore be promoted.
Chengdong Xia; Songtao Lv; Lingyun You; Dong Chen; Yipeng Li; Jianlong Zheng. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials 2019, 12, 889 .
AMA StyleChengdong Xia, Songtao Lv, Lingyun You, Dong Chen, Yipeng Li, Jianlong Zheng. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials. 2019; 12 (6):889.
Chicago/Turabian StyleChengdong Xia; Songtao Lv; Lingyun You; Dong Chen; Yipeng Li; Jianlong Zheng. 2019. "Unified Strength Model of Asphalt Mixture under Various Loading Modes." Materials 12, no. 6: 889.
In order to study the influence of freeze-thaw cycles on the multi-axial strength of AC (Asphalt Concrete)-13 and SMA (Stone Mastic Asphalt)-13 asphalt mixtures which are widely used in China, triaxial tests were carried out in the laboratory. Two nonlinear failure criterions under three-dimensional stress states in octahedral space were established. A linear model for engineering design and its simplified testing method were then presented. The three-dimensional failure criteria of asphalt mixtures after 0, 1, 3, 5, 10, 15, 20 freeze-thaw cycles were also proposed. The results indicated that the multi-axial strength decayed significantly after 20 freeze-thaw cycles. It is noteworthy that the strength degrades rapidly during the first 5 freeze-thaw cycles. Compared with AC-13 asphalt mixture, the SMA-13 asphalt mixture exhibits better performance on the resistance to freeze-thaw damage, and it is recommended as the upper surface layer material of pavement structure.
Tuo Huang; Shuai Qi; Ming Yang; Songtao Lv; Hongfu Liu; Jianlong Zheng. Strength Criterion of Asphalt Mixtures in Three-Dimensional Stress States under Freeze-Thaw Conditions. Applied Sciences 2018, 8, 1302 .
AMA StyleTuo Huang, Shuai Qi, Ming Yang, Songtao Lv, Hongfu Liu, Jianlong Zheng. Strength Criterion of Asphalt Mixtures in Three-Dimensional Stress States under Freeze-Thaw Conditions. Applied Sciences. 2018; 8 (8):1302.
Chicago/Turabian StyleTuo Huang; Shuai Qi; Ming Yang; Songtao Lv; Hongfu Liu; Jianlong Zheng. 2018. "Strength Criterion of Asphalt Mixtures in Three-Dimensional Stress States under Freeze-Thaw Conditions." Applied Sciences 8, no. 8: 1302.
In order to explore the moduli decay patterns of asphalt mixtures under different loading conditions, the nonlinear fatigue damage model was implemented in order to simulate the moduli decay patterns. Then, the direct tensile, indirect tensile, and uniaxial compression fatigue tests were employed under four kinds of stress levels with four parallel tests. The specimens of AC-13C Styrene-butadiene-styrene (SBS) modified mixtures were manufactured. Based on the test results, the decay patterns of the moduli during fatigue tests under different stress states were revealed, and the parameters of the damage model under different test conditions were obtained. By changing the values of the model parameters under a certain loading condition, fatigue curves were obtained. Then, the fatigue properties of asphalt mixtures under different stress states could be compared and analyzed directly. The result indicated that the evolution curves of fatigue damage for the direct tensile test, the indirect tensile test, and the uniaxial compression test all experienced three stages, which indicates that the fatigue damage characteristic of asphalt mixtures is non-linear. The decay patterns of the direct tensile moduli and the tensile moduli measured by the indirect tensile test are similar. The decay patterns of the uniaxial compression and the compression moduli measured by indirect tensile test are similar. The decay patterns of tensile and compressive moduli are obviously different. At the same cycle ratio state, the position of the decay curve for the compression moduli is higher than that of the tensile moduli. It indicates that the tensile failure is the main reason of the fatigue damage for asphalt mixture. The new analysis method of fatigue damage was proposed, which provides a possibility to compare the fatigue results that were obtained from different loading conditions and different specimen sizes.
Songtao Lv; Xiyan Fan; Chengdong Xia; Jianlong Zheng; Dong Chen; Lingyun You. Characteristics of Moduli Decay for the Asphalt Mixture under Different Loading Conditions. Applied Sciences 2018, 8, 840 .
AMA StyleSongtao Lv, Xiyan Fan, Chengdong Xia, Jianlong Zheng, Dong Chen, Lingyun You. Characteristics of Moduli Decay for the Asphalt Mixture under Different Loading Conditions. Applied Sciences. 2018; 8 (5):840.
Chicago/Turabian StyleSongtao Lv; Xiyan Fan; Chengdong Xia; Jianlong Zheng; Dong Chen; Lingyun You. 2018. "Characteristics of Moduli Decay for the Asphalt Mixture under Different Loading Conditions." Applied Sciences 8, no. 5: 840.
Subgrade soils are often unsaturated and the resilient modulus (MR) of subgrade soils is usually subjected to the climate environment and traffic loading in the field. Therefore, the Matric Suction (MS) and traffic loading are considered to be two important parameters associated to the MR prediction model. To verify the MR prediction model, the MS of the typical subgrade soil were determined through the pressure plate test. In this study, the soil-water characteristic curves were also described using the Fredlund & Xing’s model. Then, the dynamic MR of the typical subgrade soil under various stresses and water contents was measured. After that, a new prediction model was proposed with the model variables including the minimum bulk stress, octahedral sheer stress and matric suction, and the validity of the new model was verified by previous research results. Finally, the correlations between the physical properties of subgrade soils including the percentage passing through the No. 200 sieve (0.075 mm), plasticity index, liquid limit, dry density and the regression coefficients of the new model were established. The results show that the new model can be used to predict the MR well, and it effectively solves the problem that the bulk stress is equal with a different combinations of the confining pressure and deviator stress. At the same time, the MR can be predicted much more easily with physical parameters of subgrade soils rather than conducting triaxial tests.
Yongsheng Yao; Jianlong Zheng; Junhui Zhang; Junhui Peng; Jue Li. Model for Predicting Resilient Modulus of Unsaturated Subgrade Soils in South China. KSCE Journal of Civil Engineering 2018, 22, 2089 -2098.
AMA StyleYongsheng Yao, Jianlong Zheng, Junhui Zhang, Junhui Peng, Jue Li. Model for Predicting Resilient Modulus of Unsaturated Subgrade Soils in South China. KSCE Journal of Civil Engineering. 2018; 22 (6):2089-2098.
Chicago/Turabian StyleYongsheng Yao; Jianlong Zheng; Junhui Zhang; Junhui Peng; Jue Li. 2018. "Model for Predicting Resilient Modulus of Unsaturated Subgrade Soils in South China." KSCE Journal of Civil Engineering 22, no. 6: 2089-2098.
In order to reveal the effects of aging on fatigue damage evolution pattern of asphalt mixture, and to reveal the fatigue damage patterns of asphalt pavement during its service life more accurately, the viscoelastic fatigue damage model for the aged asphalt mixtures was proposed based on the Burgers viscoelastic model. The dissipation energy was taken as the damage variable, and the direct tension fatigue tests for asphalt mixture in five different aging degrees were conducted. The viscoelastic parameters of the aged asphalt mixtures were obtained.The calculationmethod of the cumulative fatigue damage was proposed, which considers the aging effects. Moreover, the critical fatigue damage degree and fatigue life calculation equations were derived by employing the fatigue damage model, which were calculated and compared. The calculation errors range from 3% to 18%, which was within an acceptable error range of 30%. The research results show that the aging has a prominent impact on fatigue properties of asphalt mixtures, which could be illustrated by the change of the parameters of the viscoelastic fatigue damage model for the aged asphalt mixtures. The prediction precision of fatigue life is acceptable for using the proposed viscoelastic fatigue damage model.
Songtao Lv; Chaochao Liu; Jianlong Zheng; Zhanping You; Lingyun You. Viscoelastic Fatigue Damage Properties of Asphalt Mixture with Different Aging Degrees. KSCE Journal of Civil Engineering 2018, 22, 2073 -2081.
AMA StyleSongtao Lv, Chaochao Liu, Jianlong Zheng, Zhanping You, Lingyun You. Viscoelastic Fatigue Damage Properties of Asphalt Mixture with Different Aging Degrees. KSCE Journal of Civil Engineering. 2018; 22 (6):2073-2081.
Chicago/Turabian StyleSongtao Lv; Chaochao Liu; Jianlong Zheng; Zhanping You; Lingyun You. 2018. "Viscoelastic Fatigue Damage Properties of Asphalt Mixture with Different Aging Degrees." KSCE Journal of Civil Engineering 22, no. 6: 2073-2081.
The objective of this article is to establish a fatigue equation based on the true stress ratio for cement-treated aggregate base materials. The true stress ratio herein means the ratio of the stress and the true strength of the cement-treated aggregate base materials related to loading rates and curing times. The unconfined compressive strength tests and compressive resilience modulus tests were carried out under various loading rates and curing times of 3, 7, 14, 28, 60, 90 days, respectively. According to the test results, the relationship between the unconfined compressive strength (a mix design parameter in China) and the compressive resilience modulus (a structural design parameter and the construction quality control parameter in China) of the cement-treated aggregate base material with different curing times was established. However, it was found that the strengths varied with the loading rates, which is not reflected in the existing fatigue equations. Therefore, it is questionable to obtain the stress ratio of fatigue tests with a fixed strength value obtained from the standard strength test where the loading rate is fixed (in China, the fixed loading rate is 1 mm/min for cement-treated aggregate base materials). Thus, in this paper, the four-point bending strength (i.e., flexural strength) test was carried out at different loading rates to resolve such deficiencies. Based on the strength test results at different loading rates, the true stress ratio of the fatigue test corresponding to the fatigue loading rate can be calculated. Then the four-point bending fatigue test was conducted to establish an improved fatigue equation characterized by the true stress ratio. The results show that the patterns of variation for unconfined compressive strength increasing with the curing time were similar to that of the compressive resilience modulus. The fatigue equation curve based on the true stress ratio can be extended to the strength failure point of (1, 1), where both the true stress ratio and the fatigue life value are one. The internal relationship between the strength failure and the fatigue failure was unified. This article provides a theoretical method and basis for unifying the mix design parameters and the construction quality control parameters.
Songtao Lv; Chaochao Liu; Jingting Lan; Hongwei Zhang; Jianlong Zheng; Zhanping You. Fatigue Equation of Cement-Treated Aggregate Base Materials under a True Stress Ratio. Applied Sciences 2018, 8, 691 .
AMA StyleSongtao Lv, Chaochao Liu, Jingting Lan, Hongwei Zhang, Jianlong Zheng, Zhanping You. Fatigue Equation of Cement-Treated Aggregate Base Materials under a True Stress Ratio. Applied Sciences. 2018; 8 (5):691.
Chicago/Turabian StyleSongtao Lv; Chaochao Liu; Jingting Lan; Hongwei Zhang; Jianlong Zheng; Zhanping You. 2018. "Fatigue Equation of Cement-Treated Aggregate Base Materials under a True Stress Ratio." Applied Sciences 8, no. 5: 691.
This paper presents a systematic pioneering study on the use of agricultural-purpose frequency domain reflectometry (FDR) sensors to monitor temperature and moisture of a subgrade in highway extension and reconstruction engineering. The principle of agricultural-purpose FDR sensors and the process for embedding this kind of sensors for subgrade engineering purposes are introduced. Based on field measured weather data, a numerical analysis model for temperature and moisture content in the subgrade’s soil is built. Comparisons of the temperature and moisture data obtained from numerical simulation and FDR-based measurements are conducted. The results show that: (1) the embedding method and process, data acquisition, and remote transmission presented are reasonable; (2) the temperature and moisture changes are coordinated with the atmospheric environment and they are also in close agreement with numerical calculations; (3) the change laws of both are consistent at positions where the subgrade is compacted uniformly. These results suggest that the data measured by the agricultural-purpose FDR sensors are reliable. The findings of this paper enable a new and effective real-time monitoring method for a subgrade’s temperature and moisture changes, and thus broaden the application of agricultural-purpose FDR sensors.
Yongsheng Yao; Jian-Long Zheng; Zeng-Shun Chen; Jun-Hui Zhang; Yong Li. Field Measurements and Numerical Simulations of Temperature and Moisture in Highway Engineering Using a Frequency Domain Reflectometry Sensor. Sensors 2016, 16, 857 .
AMA StyleYongsheng Yao, Jian-Long Zheng, Zeng-Shun Chen, Jun-Hui Zhang, Yong Li. Field Measurements and Numerical Simulations of Temperature and Moisture in Highway Engineering Using a Frequency Domain Reflectometry Sensor. Sensors. 2016; 16 (6):857.
Chicago/Turabian StyleYongsheng Yao; Jian-Long Zheng; Zeng-Shun Chen; Jun-Hui Zhang; Yong Li. 2016. "Field Measurements and Numerical Simulations of Temperature and Moisture in Highway Engineering Using a Frequency Domain Reflectometry Sensor." Sensors 16, no. 6: 857.