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There has been an increasing interest in using bio-waste materials to modify asphalt binders in recent years. Among the bio-waste materials, fish scale powder (FSP) has been widely studied in various industries, while the research in the asphalt industry is still limited. Thus, this work investigated the effect of silane coupling agent surface-treated fish scale powder (ST-FSP) on asphalt performance. The surface-treated fish scale powder modified asphalt (ST-FSMA) was then prepared with different mass rates (4%, 8%, 12%, and 16%). Fish scale powder modified asphalt (FSMA) and neat asphalt were also prepared as the control. It is found that the surface treatment with the silane coupling agent may further improve the modification effect of FSP on the penetration, softening point, viscosity, and rutting resistance of the asphalt binder. The master curves showed that ST-FSP could further increase the storage modulus and loss modulus of asphalt binder. Furthermore, the reduction in the ductility and compatibility of the asphalt binder due to the added FSP can be improved with the surface treatment. The influence of the surface treatment on the low- and intermediate-temperature behavior of the asphalt matrix is minimal. The mechanism analysis with Fourier transform infrared (FT-IR) spectroscopy confirmed the feasibility of grafting silane coupling agent onto FSP, and there is physical mixing between ST-FSP and asphalt. Fluorescence microscope (FM) and Scanning electron microscope (SEM) showed that the enhanced dispersibility and reduced agglomeration of FSP in the asphalt were observed from ST-FSMA. This work can provide insights into the utilization of fish scale waste as an innovative and sustainable biomaterial in the asphalt industry.
Songtao Lv; Long Hu; Chengdong Xia; Xinghai Peng; Milkos Borges Cabrera; Shuaicheng Guo; Lingyun You. Surface-treated fish scale powder with silane coupling agent in asphalt for performance improvement: Conventional properties, rheology, and morphology. Journal of Cleaner Production 2021, 311, 127772 .
AMA StyleSongtao Lv, Long Hu, Chengdong Xia, Xinghai Peng, Milkos Borges Cabrera, Shuaicheng Guo, Lingyun You. Surface-treated fish scale powder with silane coupling agent in asphalt for performance improvement: Conventional properties, rheology, and morphology. Journal of Cleaner Production. 2021; 311 ():127772.
Chicago/Turabian StyleSongtao Lv; Long Hu; Chengdong Xia; Xinghai Peng; Milkos Borges Cabrera; Shuaicheng Guo; Lingyun You. 2021. "Surface-treated fish scale powder with silane coupling agent in asphalt for performance improvement: Conventional properties, rheology, and morphology." Journal of Cleaner Production 311, no. : 127772.
In order to reveal the effect of complex stress state on the characteristics of strength and stiffness of asphalt mixture, the self-developed double confining pressure triaxial test method was used in this study. The one-time failure and resilient modulus tests in complex stress state were carried out on the SMA-13 and AC-13 asphalt mixtures widely used in China's asphalt pavement, especially in the combined tensile-compressive stress state. The failure principal stress of material and its stress-strain data under the step loading condition were obtained. The calculation model of resilient modulus in complex stress state and the failure criterion I1-J2 in the principal stress space were established. On this basis, based on the generalized Hooke's law, a three-dimensional strain failure criterion model for asphalt mixture considering the effect of stiffness was also established by the conversion method. The research results can provide experimental and theoretical support for the reasonable selection and resistance calculation of material parameters of asphalt mixture in complex stress state.
Tuo Huang; Jie Chen; Mi Li; Yao Tang; Songtao Lv; Huanan Yu; Hongfu Liu; Wei Yan. Investigation on three-dimensional failure criterion of asphalt mixture considering the effect of stiffness. Construction and Building Materials 2021, 285, 122431 .
AMA StyleTuo Huang, Jie Chen, Mi Li, Yao Tang, Songtao Lv, Huanan Yu, Hongfu Liu, Wei Yan. Investigation on three-dimensional failure criterion of asphalt mixture considering the effect of stiffness. Construction and Building Materials. 2021; 285 ():122431.
Chicago/Turabian StyleTuo Huang; Jie Chen; Mi Li; Yao Tang; Songtao Lv; Huanan Yu; Hongfu Liu; Wei Yan. 2021. "Investigation on three-dimensional failure criterion of asphalt mixture considering the effect of stiffness." Construction and Building Materials 285, no. : 122431.
This study analyzed the feasibility of modifying the asphalt binder with the waste leather (WL). The 70# base asphalt was selected as the base matrix and four samples with different waste leather content were prepared. The test results indicated that the rotational viscosity of the waste leather modified asphalt was obviously higher than that of the original binder. Furthermore, it is found that the added waste leather increases the elastic component of the asphalt through the dynamic shear rheometer (DSR) test, thus enhances the high-temperature rheological properties and creep recovery ability of the asphalt. The modification with waste leather can also enhance the anti-aging properties of the asphalt and the enhancement effect generally increases with the leather content. The fourier transform infrared spectroscopy (FTIR), results indicate the modification with the waste leather is mainly a physical process without changing the chemical structure of the asphalt binder. This study pcreates new recycling routes for the waste leather and provides a considerable reference for the application of the waste leather modified asphalt binder.
Songtao Lv; Yanpeng Guo; Chengdong Xia; Chaochao Liu; Long Hu; Shuaicheng Guo; Xiaofeng Wang; Milkos Borges Cabrera; Mi Li. Investigation on high-temperature resistance to permanent deformation of waste leather modified asphalt. Construction and Building Materials 2021, 282, 122541 .
AMA StyleSongtao Lv, Yanpeng Guo, Chengdong Xia, Chaochao Liu, Long Hu, Shuaicheng Guo, Xiaofeng Wang, Milkos Borges Cabrera, Mi Li. Investigation on high-temperature resistance to permanent deformation of waste leather modified asphalt. Construction and Building Materials. 2021; 282 ():122541.
Chicago/Turabian StyleSongtao Lv; Yanpeng Guo; Chengdong Xia; Chaochao Liu; Long Hu; Shuaicheng Guo; Xiaofeng Wang; Milkos Borges Cabrera; Mi Li. 2021. "Investigation on high-temperature resistance to permanent deformation of waste leather modified asphalt." Construction and Building Materials 282, no. : 122541.
Limited non-renewable resources and deteriorating ecological environment have emphasized the significance of the effective utilization of biomaterials. Many studies have specified that fish scales (FS) possess potential applications as cleaner production in various industrial sectors. However, research on the effect of this eco-friendly and sustainable biomaterial on asphalt has not been reported. Thus, this study aims to investigate the effect of fish scale powder (FSP) on the performance of asphalt binders. Four types of fish scales modified asphalts (FSMA) were prepared by adding different contents of FSP to 70# base asphalt (4%, 8%, 12%, and 16% by weight of the base asphalt). Rotational viscometer (RV), dynamic shear rheometer (DSR), and bending beam rheometer (BBR) were employed to characterize the rheologic behavior of FSMA. The phase separation and sessile drop tests were carried out to evaluate the storage stability and adhesion of FSMA. In addition, the chemical characteristics were investigated by Fourier transform infrared (FTIR) spectroscopy. It was found that FSP enhanced the adhesion, viscoelastic properties, temperature susceptibility, and resistance to permanent deformation of asphalt. Moreover, it was discovered that FSP at low content had little effect on the aging, fatigue, and cracking resistance of the asphalt. Besides, there was a physical mixing between FSP and asphalt binder, and the mixture was a storage-stable product. Overall, it is promising and feasible to use FSP as a bio-modifier for asphalt binders and reduce waste treatment costs. This method is a sustainable utilization of fish scale waste.
Songtao Lv; Long Hu; Chengdong Xia; Milkos Borges Cabrera; Yanpeng Guo; Chaochao Liu; Lingyun You. Recycling fish scale powder in improving the performance of asphalt: A sustainable utilization of fish scale waste in asphalt. Journal of Cleaner Production 2020, 288, 125682 .
AMA StyleSongtao Lv, Long Hu, Chengdong Xia, Milkos Borges Cabrera, Yanpeng Guo, Chaochao Liu, Lingyun You. Recycling fish scale powder in improving the performance of asphalt: A sustainable utilization of fish scale waste in asphalt. Journal of Cleaner Production. 2020; 288 ():125682.
Chicago/Turabian StyleSongtao Lv; Long Hu; Chengdong Xia; Milkos Borges Cabrera; Yanpeng Guo; Chaochao Liu; Lingyun You. 2020. "Recycling fish scale powder in improving the performance of asphalt: A sustainable utilization of fish scale waste in asphalt." Journal of Cleaner Production 288, no. : 125682.
The authors wish to make the following correction to this paper
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.
Rubberized asphalt (RA) has been successfully applied in road engineering due to its excellent performance; however, the most widely used rubber content is about 20%.To improve the content of waste rubber and ensure its performance, seven rubberized asphalts with different powder content were prepared by high-speed shearing. Firstly, penetration, softening point, and ductility tests were carried out to investigate the conventional physical features of high-content rubberized asphalt (HCRA). Then, the dynamic shear rheometer test (DSR) was conducted to estimate the high-temperature rheological properties. The bending beam rheometer test (BBR) was carried out to evaluate the low-temperature rheological performance. Finally, combined with the macroscopic performance test, the modification mechanism was revealed by the Fourier transform infrared reflection (FTIR) test, and scanning electron microscope (SEM) analysis was used to observe the microscopic appearance before and after aging. The results show that rubberized asphalt has excellent properties in high- and low-temperature conditions, and fatigue resistance is also outstanding compared with neat asphalt. As the crumb rubber content increases, it is evident that the 40% RA performance is the best. The low-temperature properties of HCRA are better than the traditional 20% rubberized asphalt. This study provides a full test foundation for the efficient utilization of HCRA in road engineering.
Guoqing Wang; Xinqiang Wang; Songtao Lv; Lusheng Qin; Xinghai Peng. Laboratory Investigation of Rubberized Asphalt Using High-Content Rubber Powder. Materials 2020, 13, 4437 .
AMA StyleGuoqing Wang, Xinqiang Wang, Songtao Lv, Lusheng Qin, Xinghai Peng. Laboratory Investigation of Rubberized Asphalt Using High-Content Rubber Powder. Materials. 2020; 13 (19):4437.
Chicago/Turabian StyleGuoqing Wang; Xinqiang Wang; Songtao Lv; Lusheng Qin; Xinghai Peng. 2020. "Laboratory Investigation of Rubberized Asphalt Using High-Content Rubber Powder." Materials 13, no. 19: 4437.
The most common primary damage form of rubber asphalt pavements is fatigue cracking. At present, the indirect tension, direct tension, bending, and unconfined compression tests are the main considered fatigue parameters to design the structure of rubber asphalt pavement. However, the fatigue test results analyzed by various test methods have a quite significant divergence, which represents a lack of accuracy to access the durability of rubber asphalt mixture objectively. Thus, in the structural resistance design of rubber asphalt pavement, there exists a problem of artificial randomness of fatigue parameters. Hence, the primary objective of this study is to improve the procedure for determining the structural resistance of rubber asphalt pavement. To this end, the direct tensile, unconfined compressive, and indirect tensile strength tests of rubber asphalt mixture were performed under various loading rates to reveal the velocity-dependent of the strength of rubber asphalt mixture. The model of direct tensile strength, unconfined compressive strength, and indirect tensile strength increasing with loading rate are SD=7.772v0.205, SC=1.748v0.204, and ST=1.077v0.207, respectively. The stress ratio related to both the traditional S-N fatigue equation and the loading rate was defined as the standard stress ratio and the velocity-dependent stress ratio, respectively. The fatigue test of rubber asphalt mixture was conducted. The results from those experiments were analyzed. A fatigue equation (Nf=tv-5.129 R2=0.853) related to the loading rate was established. The results indicated that the viscoelastic characteristics of rubber asphalt mixture are not taken into consideration in the traditional S-N fatigue equation, which contributed to the non-uniqueness and uncertainty of fatigue test results. The viscoelastic characteristics of rubber asphalt mixture are considered by the fatigue equation related to the velocity-dependent stress ratio. Thus, a new method (Kv=Nf0.0958) considering the influence of the loading rate for calculating the strength structure coefficient of the rubber asphalt mixture was proposed. The effectiveness and completeness of the mechanical behavior of pavement structure characterized by material parameters were improved. Thus, the utilization rate of waste rubber for pavement construction can be significantly increased and the life cycle cost of asphalt pavement is reduced.
Chengdong Xia; Songtao Lv; Milkos Borges Cabrera; Xiaofeng Wang; Chao Zhang; Lingyun You. Unified characterizing fatigue performance of rubberized asphalt mixtures subjected to different loading modes. Journal of Cleaner Production 2020, 279, 123740 .
AMA StyleChengdong Xia, Songtao Lv, Milkos Borges Cabrera, Xiaofeng Wang, Chao Zhang, Lingyun You. Unified characterizing fatigue performance of rubberized asphalt mixtures subjected to different loading modes. Journal of Cleaner Production. 2020; 279 ():123740.
Chicago/Turabian StyleChengdong Xia; Songtao Lv; Milkos Borges Cabrera; Xiaofeng Wang; Chao Zhang; Lingyun You. 2020. "Unified characterizing fatigue performance of rubberized asphalt mixtures subjected to different loading modes." Journal of Cleaner Production 279, no. : 123740.
Cement stabilized macadam base is the primary stress diffusion and bearing layer of semi-rigid asphalt pavement, therefore its mechanical behavior directly affects pavement performance. The indirect tensile strength, unconfined compressive strength, and bending strength are the essential parameters for evaluating the bearing capacity of cement stabilized macadam. In the design of a pavement structure, the conventional mixing strength values of a test sample are analyzed and calculated at a fixed loading rate. By using this procedure, the influence of the mixing method and the different loading rates on the strength values are ignored. Besides, the strength obtained by using the fixed loading rate with different loading modes has significant differences. As a result, the artificial randomness of the strength parameter in the design of a semi-rigid asphalt pavement structure increases. In an attempt, to improve the effectiveness and completeness of the strength parameters of cement stabilized macadam under different loading modes, mechanical tests were conducted on samples prepared with both vibration mixing and conventional mixing methods. This procedure included, indirect tensile strength test, unconfined compressive strength test, and four-point bending strength test under different loading rates. The results of these strength tests each group of samples (vibration and conventional mixing method) were compared. Besides, all samples were subjected to 6 different loading rates when conducting each loading mode. These experimental values were analyzed. The loading rate and the strength value have a power function relationship and the correlation of strength rates was revealed. The results demonstrated that the vibration mixing method increases the indirect tensile strength, unconfined compressive strength, and four-point bending strength by 13%, 14%, and 10%, respectively. A unified strength model (S/S0 = 0.9841 + 0.16856ln (0.01019 + v/v0) under two mixing methods and various loading modes were established by using the variation between loading rate ratio and strength ratio. In the unified model, the strength under vibration mixing and conventional mixing methods, and the strength among different loading rates can be converted, which improved the test efficiency. The established unified model solves the problem of uncertainty and uniqueness of strength parameters under different loading modes. The accuracy of the semi-rigid asphalt pavement structure resistance design was effectively improved, thereby providing theoretical guidance for the construction of semi-rigid base asphalt pavement engineering.
Songtao Lv; Yanpeng Guo; Chengdong Xia; Xiaofeng Wang; Lingyun You; Milkos Borges Cabrera; Jianglong Li. Unified approach to characterize the strength of cement stabilized macadam subjected to different loading modes. Construction and Building Materials 2020, 265, 120143 .
AMA StyleSongtao Lv, Yanpeng Guo, Chengdong Xia, Xiaofeng Wang, Lingyun You, Milkos Borges Cabrera, Jianglong Li. Unified approach to characterize the strength of cement stabilized macadam subjected to different loading modes. Construction and Building Materials. 2020; 265 ():120143.
Chicago/Turabian StyleSongtao Lv; Yanpeng Guo; Chengdong Xia; Xiaofeng Wang; Lingyun You; Milkos Borges Cabrera; Jianglong Li. 2020. "Unified approach to characterize the strength of cement stabilized macadam subjected to different loading modes." Construction and Building Materials 265, no. : 120143.
Strength and fatigue life are essential parameters of pavement structure design. To accurately determine the pavement structure resistance of rubber asphalt mixture, the strength tests at various temperatures, loading rate, and fatigue tests at different stress levels were conducted in this research. Based on the proposed experiments, the change law of rubber asphalt mixture strength with different temperatures and loading rates was revealed. The phenomenological fatigue equation of rubber asphalt mixture was established. The genetic algorithm optimized backpropagation neural network (GA-BPNN) is highly reliable for optimizing production processes in civil engineering, and it has a remarkable application effect. A GA-BPNN strength and fatigue life prediction model was created in this study. The reliability of the prediction model was verified through experiments. The results showed that the rubber asphalt mixture strength decreases and increases with the increase of temperature and loading rate, respectively. The goodness of fit of the rubber asphalt mixture strength and fatigue life prediction model based on the GA-BPNN could reach 0.989 and 0.998, respectively. The indicators of the fatigue life prediction model are superior to the conventional phenomenological fatigue equation model. The GA-BPNN provides an effective method for predicting the rubber asphalt mixture strength and fatigue life, which significantly improves the accuracy of the resistance design of the rubber asphalt pavement structure.
Jiang Yuan; Songtao Lv; Xinghai Peng; Lingyun You; Milkos Borges Cabrera. Investigation of Strength and Fatigue Life of Rubber Asphalt Mixture. Materials 2020, 13, 3325 .
AMA StyleJiang Yuan, Songtao Lv, Xinghai Peng, Lingyun You, Milkos Borges Cabrera. Investigation of Strength and Fatigue Life of Rubber Asphalt Mixture. Materials. 2020; 13 (15):3325.
Chicago/Turabian StyleJiang Yuan; Songtao Lv; Xinghai Peng; Lingyun You; Milkos Borges Cabrera. 2020. "Investigation of Strength and Fatigue Life of Rubber Asphalt Mixture." Materials 13, no. 15: 3325.
As the primary surface type for high-grade Chinese highways, the long-term performance of asphalt pavement can affect significantly transportation efficiency. It has been confirmed that fatigue cracking is one of the major failure modes for asphalt pavement, which can cause a great reduction of asphalt pavement durability. Currently, the fatigue properties of asphalt mixtures are evaluated mainly based on traditional laboratory fatigue tests, such as bending fatigue tests and indirect tensile fatigue tests. However, none of these fatigue test methods can realistically evaluate the fatigue performance of asphalt pavement under the repeated wheel load. To resolve this issue, the model mobile load simulator (MMLS3), which is a small-scale accelerated pavement test device, was utilized to evaluate the fatigue life of six kinds of asphalt mixtures. The fatigue damage variable was defined as stiffness reduction. Based on the small-scale accelerated pavement test, a stiffness reduction model for asphalt mixtures was determined. A stiffness reduction law for asphalt mixtures during the fatigue process was proposed. The stiffness evolution process could be divided into three phases, which are the adaptation phase, the quasi-stationary phase, and the failure phase. A maximum value of the rate of stiffness reduction from the quasi-stationary phase into the failure phase was proposed as the failure threshold. Besides the fatigue life obtained from the failure criteria had a good agreement with the test results. The results from this research can be used as a theoretical reference for evaluating the fatigue life of asphalt mixtures and improving the durability of asphalt pavement.
Songtao Lv; Long Hu; Chengdong Xia; Xiaofeng Wang; Milkos Borges Cabrera; Shuaicheng Guo; Jie Chen. Development of fatigue damage model of asphalt mixtures based on small-scale accelerated pavement test. Construction and Building Materials 2020, 260, 119930 .
AMA StyleSongtao Lv, Long Hu, Chengdong Xia, Xiaofeng Wang, Milkos Borges Cabrera, Shuaicheng Guo, Jie Chen. Development of fatigue damage model of asphalt mixtures based on small-scale accelerated pavement test. Construction and Building Materials. 2020; 260 ():119930.
Chicago/Turabian StyleSongtao Lv; Long Hu; Chengdong Xia; Xiaofeng Wang; Milkos Borges Cabrera; Shuaicheng Guo; Jie Chen. 2020. "Development of fatigue damage model of asphalt mixtures based on small-scale accelerated pavement test." Construction and Building Materials 260, no. : 119930.
In this paper, two types of Styrene-Butadiene-Rubber (SBR) were adopted to modify the Buton-rock asphalt (BRA) modified asphalt, aiming to select a binder with excellent comprehensive performances. Powder SBR and latex SBR (0%, 2%, 4%, 6%, and 8%), were mixed with the 15 w% BRA modified asphalt. The characterization of rheological properties included dynamic shear rheometer, rotational viscometer, and bending beam rheometer test. The short-term aging performance was characterized by the ratio of the complex shear modulus from the un-aged and rolling thin film oven (RTFOT) -aged asphalt. Besides, Fourier transform infrared spectroscopy and scanning electron microscopy were conducted to reveal the modification mechanism. It was observed that the two kinds of BRA-SBR modified asphalt had preferable anti-crack capacity at low temperatures than the BRA modified asphalt. Compared with latex SBR, the powder SBR significantly improved the high-temperature performance, and the anti-aging capacity was stable. However, some negative influence occurred by the addition of latex SBR on the anti-rutting and short-term aging property. According to the micro-mechanism analysis, adding powder SBR and latex SBR into BRA modified asphalt was a physical blending process, and they improved the dispersion state of BRA in asphalt. Based on the comprehensive performance, the recommended combination was BRA and powder SBR.
Fangting Qu; Songtao Lv; Junfeng Gao; Chaochao Liu. Performance and Mechanism of Asphalt Modified by Buton-Rock Asphalt and Different Types of Styrene-Butadiene-Rubber. Applied Sciences 2020, 10, 3077 .
AMA StyleFangting Qu, Songtao Lv, Junfeng Gao, Chaochao Liu. Performance and Mechanism of Asphalt Modified by Buton-Rock Asphalt and Different Types of Styrene-Butadiene-Rubber. Applied Sciences. 2020; 10 (9):3077.
Chicago/Turabian StyleFangting Qu; Songtao Lv; Junfeng Gao; Chaochao Liu. 2020. "Performance and Mechanism of Asphalt Modified by Buton-Rock Asphalt and Different Types of Styrene-Butadiene-Rubber." Applied Sciences 10, no. 9: 3077.
The molecular model of asphalt binder was established by means of molecular dynamics (MD). The MD model was validated with respect of density, glass transition temperature, viscosity and solubility parameters. An interface system was created by inserting a vacuum pad of 50 Å between 2 groups of asphalt binders to study the self-healing behavior of the asphalt binder, e.g. internal volume, diffusion rate of each component and energy variation of the model. The molecular diffusion of aged asphalt binder, SBS modified asphalt binder, and virgin asphalt binder are studied. The results show that the “compression” of asphalt binder volume and the “stretching” of the asphalt binder molecules is responsible for the disappearance of vacuum micro-cracks inside the asphalt binder. When the model volume is “compressed”, the volume of the asphalt model decreases until the micro-cracks in the asphalt binder disappear completely. The molecular volume of asphalt decreases greatly at the beginning of the MD simulation, and then becomes stable. The length of asphalt model increases in the OZ direction, while the length of the OX and OY directions decreases, indicating that asphalt “stretces” during the self-healing process. During the self-healing process, the diffusion coefficient of asphaltene molecule is the lowest, while the diffusion coefficient of the saturates is the highest at 360 K, aromatics and resins are close to the average value 6.227 × 10−4 cm2/s in the MD model. Self-healing is mainly based on the Van der Waals forces between non-bonded molecules. The aging of asphalt molecules reduces the diffusion rate of the asphalt model, and the SBS additive indirectly enhances the diffusion rate of asphalt.
Liang He; Guannan Li; Songtao Lv; Jie Gao; Karol J. Kowalski; Jan Valentin; Alessio Alexiadis. Self-healing behavior of asphalt system based on molecular dynamics simulation. Construction and Building Materials 2020, 254, 119225 .
AMA StyleLiang He, Guannan Li, Songtao Lv, Jie Gao, Karol J. Kowalski, Jan Valentin, Alessio Alexiadis. Self-healing behavior of asphalt system based on molecular dynamics simulation. Construction and Building Materials. 2020; 254 ():119225.
Chicago/Turabian StyleLiang He; Guannan Li; Songtao Lv; Jie Gao; Karol J. Kowalski; Jan Valentin; Alessio Alexiadis. 2020. "Self-healing behavior of asphalt system based on molecular dynamics simulation." Construction and Building Materials 254, no. : 119225.
The quickly accumulated crayfish shell waste in China has led to severe environmental issues and recycling pressure. This study aims to build an efficient protocol by utilizing waste crayfish shell powder in the production of high-performance and sustainable asphalt binder. The asphalt binder modified with different contents of crayfish shell powder (5%, 10% and 20% mass ratio to control asphalt, respectively) were first prepared at the temperature of 140oC–150 °C. Then the softening point and the penetration of the prepared samples were implemented to compare the stiffness difference between the modified and original asphalt binder. The results indicated that the added shell powder increased the softening point and decreased the penetration of the control asphalt. Furthermore, the high-temperature stability of the asphalt binder was examined by the dynamic shear rheometer (DSR) tests. The DSR results revealed that adding shell powder could enhance the rutting resistance of the asphalt binder by decreasing the phase angle δ, increasing the dynamic shear modulus |G∗| and finally enhancing the rutting factor |G∗|/sinδ. After that, to compare the creep performance between the control and modified asphalt binder, the multiple stress creep recovery (MSCR) tests were employed. The results of the MSCR test showed that at the same temperature, the percent recovery was higher while the non-recoverable creep compliance Jnr of modified asphalt was lower than those of the control binder. These results indicated that the added crayfish shell powder could increase the stiffness, improve the high-temperature stability and creep resistance of the asphalt binder. Finally, fourier transform infrared spectroscopy (FT-IR) test results implied that the added CS would not affect the chemical structure of the asphalt binder, and the modification was mainly a physical process. The novelty and limitation of this study have also been detailedly explained in the discussion part. The test results could provide a reference for the engineering application of the crayfish shell powder modified asphalt material and lead to both a cleaner and greener product.
Songtao Lv; Chengdong Xia; Qing Yang; Shuaicheng Guo; Lingyun You; Yanpeng Guo; Jianlong Zheng. Improvements on high-temperature stability, rheology, and stiffness of asphalt binder modified with waste crayfish shell powder. Journal of Cleaner Production 2020, 264, 121745 .
AMA StyleSongtao Lv, Chengdong Xia, Qing Yang, Shuaicheng Guo, Lingyun You, Yanpeng Guo, Jianlong Zheng. Improvements on high-temperature stability, rheology, and stiffness of asphalt binder modified with waste crayfish shell powder. Journal of Cleaner Production. 2020; 264 ():121745.
Chicago/Turabian StyleSongtao Lv; Chengdong Xia; Qing Yang; Shuaicheng Guo; Lingyun You; Yanpeng Guo; Jianlong Zheng. 2020. "Improvements on high-temperature stability, rheology, and stiffness of asphalt binder modified with waste crayfish shell powder." Journal of Cleaner Production 264, no. : 121745.
To describe the interaction of fatigue-creep damage of an asphalt mixture under the action of semi-sine cyclic loading reasonably, a direct tension fatigue test was carried out under four different stress levels (0.5, 1, 1.5, and 2 MPa) based on the fact that semi-sine fatigue stress can be decomposed into creeping stress and simple fatigue stress. In addition, tension-compression fatigue and static creep tests were carried out under four stress levels: 0.25, 0.5, 0.75, 1 MPa. For each test, five parallel tests were carried out at the same stress level. The Chaboche fatigue damage model and Kachanov creep damage model were employed to evaluate the damage evolution of the mixture both in the fatigue and creep tests. According to the test results, the damage evolution trends were revealed under different test processes and stress levels, and the damage evolution models of three different test methods were obtained. Then, based on the principle of semi-sine fatigue stress decomposition, a fatigue-creep damage interaction model considering the interaction of fatigue and creep damage was established using normalized parameters (X = N/Nf = t/tR) as the intermediate variable. The results indicated that the damage of asphalt mixture under the action of the semi-sine cyclic load was not a simple linear accumulation of fatigue damage and creep damage, but an overall result of the interaction of fatigue damage, creep damage, and fatigue-creep damage. The fatigue-creep damage interaction model provided a good fit with the experimental data and showed a high degree of consistency with the classical damage model. The model could be used to describe the damage evolution trend of asphalt mixture under the action of semi-sine cycle load and the interaction effect of fatigue damage and creep damage.
Hongfu Liu; Xinyu Yang; Lijun Jiang; Songtao Lv; Tuo Huang; Yi Yang. Fatigue-creep damage interaction model of asphalt mixture under the semi-sine cycle loading. Construction and Building Materials 2020, 251, 119070 .
AMA StyleHongfu Liu, Xinyu Yang, Lijun Jiang, Songtao Lv, Tuo Huang, Yi Yang. Fatigue-creep damage interaction model of asphalt mixture under the semi-sine cycle loading. Construction and Building Materials. 2020; 251 ():119070.
Chicago/Turabian StyleHongfu Liu; Xinyu Yang; Lijun Jiang; Songtao Lv; Tuo Huang; Yi Yang. 2020. "Fatigue-creep damage interaction model of asphalt mixture under the semi-sine cycle loading." Construction and Building Materials 251, no. : 119070.
The objective of this paper is to propose a normalized characterization method based on the yield criterion to eliminate the impacts of different stress models on the fatigue behaviors characterization of cement-treated aggregates. Based on the theory of octahedral shear stress strength and yield surface mode, the yield surface of cement-treated aggregates was established with four-point bending, compression, and indirect tensile strength value under different loading rates. Then, the fatigue stress and corresponding ultimate strength could be characterized by the yield surface, uniformly and uniquely. In the yield surface space (I1, J2), the fatigue stress growth route from initial stress to ultimate strength was identified as fatigue stress path. Based on the fatigue stress path, the fatigue stress ratios related to loading rate and stress model were calculated. With these stress ratios, the conventional S-N fatigue equation was modified, on the basis of which a normalized characterization method of fatigue behavior was proposed to characterize the fatigue behavior of cement-treated aggregates. Compared with the traditional characterized method, the normalized characterization method has considered the influence of loading rate and stress model on strength and fatigue test results. The test results demonstrated that different strength and fatigue test results were obtained under distinct stress model and loading rates. All strength values have been expressed indiscriminately in the yield surface. With the normalized characterization method, a unique fatigue curve was gained for cement-treated aggregates under different loading rates and stress models. Therefore, findings of this work realized the normalization characterization of fatigue behavior of cement-treated aggregates.
Chaochao Liu; Songtao Lv; Xinghai Peng; Jianlong Zheng. Normalized characterization method for fatigue behavior of cement-treated aggregates based on the yield criterion. Construction and Building Materials 2019, 228, 117099 .
AMA StyleChaochao Liu, Songtao Lv, Xinghai Peng, Jianlong Zheng. Normalized characterization method for fatigue behavior of cement-treated aggregates based on the yield criterion. Construction and Building Materials. 2019; 228 ():117099.
Chicago/Turabian StyleChaochao Liu; Songtao Lv; Xinghai Peng; Jianlong Zheng. 2019. "Normalized characterization method for fatigue behavior of cement-treated aggregates based on the yield criterion." Construction and Building Materials 228, no. : 117099.
Songtao Lv; Chengdong Xia; Lingyun You; Xiaofeng Wang; Jianglong Li; Jianlong Zheng. Unified fatigue characteristics model for cement-stabilized macadam under various loading modes. Construction and Building Materials 2019, 223, 775 -783.
AMA StyleSongtao Lv, Chengdong Xia, Lingyun You, Xiaofeng Wang, Jianglong Li, Jianlong Zheng. Unified fatigue characteristics model for cement-stabilized macadam under various loading modes. Construction and Building Materials. 2019; 223 ():775-783.
Chicago/Turabian StyleSongtao Lv; Chengdong Xia; Lingyun You; Xiaofeng Wang; Jianglong Li; Jianlong Zheng. 2019. "Unified fatigue characteristics model for cement-stabilized macadam under various loading modes." Construction and Building Materials 223, no. : 775-783.
Acrylamide with a double bond and amide group can not only copolymerize with macromolecules of crumb rubber but also react with acidic groups in asphalt, so it was selected as a modifier to activate crumb rubber through chemical graft action. The purpose is to improve the compatibility between crumb rubber and asphalt and thus improve the rheological properties and storage stability of rubber asphalt. Infrared spectroscopy (IR) and scanning electron microscopy (SEM) were used to characterize the crumb rubbers and their modified asphalt. It was found that the crumb rubber of grafting acrylamide had better compatibility in asphalt due to its larger specific surface area and chemical reaction with asphalt. In addition, the high temperature rheological test, low temperature creep test, and polymer separation test were carried out to study the effect of grafted activated crumb rubber on the properties of modified asphalt. The results showed that compared with modified asphalt with common crumb rubber (CRMA), the rheological properties and storage stability of modified asphalt with grafting activated crumb rubber (A–G–R) were improved significantly. The results of microscopic and macroscopic tests show that the activated rubber particles have a larger contact area with asphalt due to a rougher surface and the chemical cross-linking between rubber particles and asphalt further strengthens their interaction. Therefore, there is a relatively stable blend system formed in modified asphalt, and its performance of modified asphalt has been improved.
Juan Xie; Yueming Yang; Songtao Lv; Yongning Zhang; Xuan Zhu; Cece Zheng. Investigation on Rheological Properties and Storage Stability of Modified Asphalt Based on the Grafting Activation of Crumb Rubber. Polymers 2019, 11, 1563 .
AMA StyleJuan Xie, Yueming Yang, Songtao Lv, Yongning Zhang, Xuan Zhu, Cece Zheng. Investigation on Rheological Properties and Storage Stability of Modified Asphalt Based on the Grafting Activation of Crumb Rubber. Polymers. 2019; 11 (10):1563.
Chicago/Turabian StyleJuan Xie; Yueming Yang; Songtao Lv; Yongning Zhang; Xuan Zhu; Cece Zheng. 2019. "Investigation on Rheological Properties and Storage Stability of Modified Asphalt Based on the Grafting Activation of Crumb Rubber." Polymers 11, no. 10: 1563.
The objective of this paper is to reveal the effects of aging on the fatigue performance of asphalt mixture based on variation patterns of fatigue parameters with aging degrees. Specimens with different aging degrees were prepared by modified SHRP’s Long-Term-Oven Aging (LTOA) test method, in which five different aging durations, included 0, 1, 3, 5, 7 days, were adopted to substitute the fixed 5 days. The fatigue parameters, including stiffness modulus, fatigue life, phase angle, Plateau Value (PV), and cumulative dissipation energy of specimens with different aging degrees under different stress ratios were obtained by the tensile fatigue test. The relationship of fatigue parameters with aging degrees and stress ratios were established. It could be observed from the results that the aging degree and stress ratio had dramatic influences on the fatigue performance of asphalt mixture. Sensitivity analysis showed that aging had the most significant effect on the initial stiffness modulus of asphalt mixture, and should be used as a control index in fatigue design. Statistical models of the relation between (PV) and fatigue life (Nf) established by the Rate of Dissipated Energy Change (RDEC) approach has an effective correlation. The Plateau Value model eliminated the effects of aging degrees and reflected the uniqueness of material parameters. Also, it could provide novel ideas for effective prediction of the fatigue life of asphalt mixtures with different aging degrees based on plateau value.
Songtao Lv; Xinghai Peng; Chaochao Liu; Dongdong Ge; Minmin Tang; Jianlong Zheng. Laboratory investigation of fatigue parameters characteristics of aging asphalt mixtures: A dissipated energy approach. Construction and Building Materials 2019, 230, 116972 .
AMA StyleSongtao Lv, Xinghai Peng, Chaochao Liu, Dongdong Ge, Minmin Tang, Jianlong Zheng. Laboratory investigation of fatigue parameters characteristics of aging asphalt mixtures: A dissipated energy approach. Construction and Building Materials. 2019; 230 ():116972.
Chicago/Turabian StyleSongtao Lv; Xinghai Peng; Chaochao Liu; Dongdong Ge; Minmin Tang; Jianlong Zheng. 2019. "Laboratory investigation of fatigue parameters characteristics of aging asphalt mixtures: A dissipated energy approach." Construction and Building Materials 230, no. : 116972.
To improve the low-temperature performance of the Buton rock asphalt (BRA)-modified asphalt, styrene-butadiene rubber (SBR) was added to it. The BRA-modified asphalt and SBR-BRA composite modified asphalt were prepared by high-speed shearing method. The penetration, softening point, ductility, and Brookfield viscosity of the two kinds of asphalt were measured. The dynamic shear rheometer (DSR) and the beam bending rheometer (BBR) were employed to research the performance of BRA-modified asphalt by adding SBR. The results showed that the pure asphalt in BRA was the main reason to reduce the low-temperature performance of neat asphalt when the content of BRA was 19%. However, the ash in BRA was the main factor to reduce the low-temperature performance when its content was more than 39.8%. When the BRA content was 59.8%, the SBR-BRA composite modified asphalt with SBR contents of 2%, 4%, 6%, and 8%, and it shows that the penetration and ductility of the BRA-modified asphalt are increased by the addition of SBR. The equivalent brittle point was reduced, the stiffness modulus was decreased, and the creep rate was increased. At the same time, the Brookfield viscosity was reduced and the rutting factor was increased. The stiffness modulus of the SBR-BRA composite modified asphalt mixture was increased. That is to say, when SBR was mixed into the BRA-modified asphalt, the low-temperature performance could be remarkably improved based on ensuring high-temperature performance. The low-temperature index of composite modified asphalt was analyzed. It was recommended to apply the equivalent brittle point to evaluate the low-temperature performance of SBR-BRA composite modified asphalt.
Xiyan Fan; Weiwei Lu; Songtao Lv; Fangwei He. Improvement of Low-Temperature Performance of Buton Rock Asphalt Composite Modified Asphalt by Adding Styrene-Butadiene Rubber. Materials 2019, 12, 2358 .
AMA StyleXiyan Fan, Weiwei Lu, Songtao Lv, Fangwei He. Improvement of Low-Temperature Performance of Buton Rock Asphalt Composite Modified Asphalt by Adding Styrene-Butadiene Rubber. Materials. 2019; 12 (15):2358.
Chicago/Turabian StyleXiyan Fan; Weiwei Lu; Songtao Lv; Fangwei He. 2019. "Improvement of Low-Temperature Performance of Buton Rock Asphalt Composite Modified Asphalt by Adding Styrene-Butadiene Rubber." Materials 12, no. 15: 2358.
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.