The Experts below are selected from a list of 3303 Experts worldwide ranked by ideXlab platform
Shunji Kang - One of the best experts on this subject based on the ideXlab platform.
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thermal Oxidative Aging mechanism of crumb rubber sbs composite modified asphalt
Construction and Building Materials, 2015Co-Authors: Li Xiang, Jian Cheng, Shunji KangAbstract:Abstract Crumb rubber/SBS composite modified asphalt (CR/SBSCMA) technology is proposed to combine the advantages of crumb rubber (CR) and SBS. Then, the production cost of the modified asphalt could be reduced, the waste rubber resources could be made full utilization, and the performance of asphalt could be improved. Rotate thin film oven test was used for stimulating the thermal Oxidative Aging of matrix asphalt, crumb rubber modified asphalt (CRMA), SBS modified asphalt (SBSMA) and CR/SBSCMA. The influences of matrix asphalt, CR and SBS on the Aging properties have been investigated based on the composition and structure analysis of asphalt and modified asphalt pre and post Aging process. Then, the thermal Oxidative Aging mechanism of CR/SBSCMA has been discussed. The test results demonstrated that the carbonyl index and sulfoxide index could reflect the Aging degree of asphalt well. Moreover, due to the presence of CR and SBS at the same time, the Aging process of CR/SBSCMA was different from CRMA and SBSMA. In the Aging process of CR/SBSCMA, the modifiers degradation products and asphalt secondary components reacted severely, which resulted in the decrease of aromatics and resin and the increase of asphaltenes and toluene insoluble. Meanwhile, the distribution and colloid structure of composite modified asphalt were changed by the modifiers degradation products, the asphalt secondary components and their reaction products, so were the macroscopic properties of CR/SBSCMA.
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Thermal Oxidative Aging mechanism of crumb rubber/SBS composite modified asphalt
Construction and Building Materials, 2015Co-Authors: Li Xiang, Jian Cheng, Shunji KangAbstract:Abstract Crumb rubber/SBS composite modified asphalt (CR/SBSCMA) technology is proposed to combine the advantages of crumb rubber (CR) and SBS. Then, the production cost of the modified asphalt could be reduced, the waste rubber resources could be made full utilization, and the performance of asphalt could be improved. Rotate thin film oven test was used for stimulating the thermal Oxidative Aging of matrix asphalt, crumb rubber modified asphalt (CRMA), SBS modified asphalt (SBSMA) and CR/SBSCMA. The influences of matrix asphalt, CR and SBS on the Aging properties have been investigated based on the composition and structure analysis of asphalt and modified asphalt pre and post Aging process. Then, the thermal Oxidative Aging mechanism of CR/SBSCMA has been discussed. The test results demonstrated that the carbonyl index and sulfoxide index could reflect the Aging degree of asphalt well. Moreover, due to the presence of CR and SBS at the same time, the Aging process of CR/SBSCMA was different from CRMA and SBSMA. In the Aging process of CR/SBSCMA, the modifiers degradation products and asphalt secondary components reacted severely, which resulted in the decrease of aromatics and resin and the increase of asphaltenes and toluene insoluble. Meanwhile, the distribution and colloid structure of composite modified asphalt were changed by the modifiers degradation products, the asphalt secondary components and their reaction products, so were the macroscopic properties of CR/SBSCMA.
Wen Xu - One of the best experts on this subject based on the ideXlab platform.
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the change of thermal mechanical properties and chemical structure of ambient cured dgeba tepa under accelerated thermo Oxidative Aging
Polymer Degradation and Stability, 2013Co-Authors: Ke Li, Kai Wang, Maosheng Zhan, Wen XuAbstract:Abstract The thermal–mechanical properties and chemical structure of ambient cured DGEBA/TEPA during thermo-Oxidative Aging were investigated in this paper. Results from Differential Scanning Calorimetry (DSC) experiments revealed that it was difficult for this ambient cured DGEBA/TEPA system to cure completely even after a long period. Dynamic Mechanical Thermal Analysis (DMTA) curves demonstrated a post-cure reaction occurred in the early period of Aging and then an additional transition peak emerged at a lower temperature, whose intensity increased with the Aging time. FTIR Spectroscopy showed that the O–H and CH 2 groups were oxidized to carbonyl groups and the main chains were degraded to the lower molecular weight compounds during thermo-Oxidative Aging process. The additional peak in DMTA curves are related to these lower molecule weight compounds. X-ray Photoelectron Spectroscopy (XPS) results further manifested that the formation of the additional peak derived from the degradation of main chains near the surface in the sample and the effect of oxidation increased with decreasing depth.
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thermal Oxidative Aging of dgeba epn lmpa epoxy system chemical structure and thermal mechanical properties
Polymer Degradation and Stability, 2011Co-Authors: Kai Wang, Maosheng Zhan, Wen Xu, Xiaojun DingAbstract:Abstract The evolvement of chemical structure and thermal–mechanical properties of diglycidyl ether of bisphenol-A and novolac epoxy resin blends cured with low molecular polyamide (DGEBA/EPN/LMPA system) during thermal-Oxidative Aging were investigated by Attenuated Total Reflectance Fourier Transform Infrared spectrometry (ATR-FTIR) and Dynamic Mechanical Thermal Analysis (DMTA). The results revealed that the chemical reactions during thermal-Oxidative Aging contained oxidation and chain scission. Some possible chemical reaction processes were given. There was a new compound formed during Aging processes and the change of its glass transition temperature ( T g ) with Aging time followed an exponential law. In addition, the changes of dynamic mechanical behavior of this epoxy system aged at four different temperatures (110 °C, 130 °C, 150 °C, 170 °C) were compared. An empirical formula was obtained through kinetic analysis and this formula can be used to predict the Oxidative degree of the surface at different Aging temperature.
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Thermal-Oxidative Aging of DGEBA/EPN/LMPA epoxy system: Chemical structure and thermal–mechanical properties
Polymer Degradation and Stability, 2011Co-Authors: Kai Wang, Maosheng Zhan, Wen Xu, Xiaojun DingAbstract:Abstract The evolvement of chemical structure and thermal–mechanical properties of diglycidyl ether of bisphenol-A and novolac epoxy resin blends cured with low molecular polyamide (DGEBA/EPN/LMPA system) during thermal-Oxidative Aging were investigated by Attenuated Total Reflectance Fourier Transform Infrared spectrometry (ATR-FTIR) and Dynamic Mechanical Thermal Analysis (DMTA). The results revealed that the chemical reactions during thermal-Oxidative Aging contained oxidation and chain scission. Some possible chemical reaction processes were given. There was a new compound formed during Aging processes and the change of its glass transition temperature ( T g ) with Aging time followed an exponential law. In addition, the changes of dynamic mechanical behavior of this epoxy system aged at four different temperatures (110 °C, 130 °C, 150 °C, 170 °C) were compared. An empirical formula was obtained through kinetic analysis and this formula can be used to predict the Oxidative degree of the surface at different Aging temperature.
Li Xiang - One of the best experts on this subject based on the ideXlab platform.
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thermal Oxidative Aging mechanism of crumb rubber sbs composite modified asphalt
Construction and Building Materials, 2015Co-Authors: Li Xiang, Jian Cheng, Shunji KangAbstract:Abstract Crumb rubber/SBS composite modified asphalt (CR/SBSCMA) technology is proposed to combine the advantages of crumb rubber (CR) and SBS. Then, the production cost of the modified asphalt could be reduced, the waste rubber resources could be made full utilization, and the performance of asphalt could be improved. Rotate thin film oven test was used for stimulating the thermal Oxidative Aging of matrix asphalt, crumb rubber modified asphalt (CRMA), SBS modified asphalt (SBSMA) and CR/SBSCMA. The influences of matrix asphalt, CR and SBS on the Aging properties have been investigated based on the composition and structure analysis of asphalt and modified asphalt pre and post Aging process. Then, the thermal Oxidative Aging mechanism of CR/SBSCMA has been discussed. The test results demonstrated that the carbonyl index and sulfoxide index could reflect the Aging degree of asphalt well. Moreover, due to the presence of CR and SBS at the same time, the Aging process of CR/SBSCMA was different from CRMA and SBSMA. In the Aging process of CR/SBSCMA, the modifiers degradation products and asphalt secondary components reacted severely, which resulted in the decrease of aromatics and resin and the increase of asphaltenes and toluene insoluble. Meanwhile, the distribution and colloid structure of composite modified asphalt were changed by the modifiers degradation products, the asphalt secondary components and their reaction products, so were the macroscopic properties of CR/SBSCMA.
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Thermal Oxidative Aging mechanism of crumb rubber/SBS composite modified asphalt
Construction and Building Materials, 2015Co-Authors: Li Xiang, Jian Cheng, Shunji KangAbstract:Abstract Crumb rubber/SBS composite modified asphalt (CR/SBSCMA) technology is proposed to combine the advantages of crumb rubber (CR) and SBS. Then, the production cost of the modified asphalt could be reduced, the waste rubber resources could be made full utilization, and the performance of asphalt could be improved. Rotate thin film oven test was used for stimulating the thermal Oxidative Aging of matrix asphalt, crumb rubber modified asphalt (CRMA), SBS modified asphalt (SBSMA) and CR/SBSCMA. The influences of matrix asphalt, CR and SBS on the Aging properties have been investigated based on the composition and structure analysis of asphalt and modified asphalt pre and post Aging process. Then, the thermal Oxidative Aging mechanism of CR/SBSCMA has been discussed. The test results demonstrated that the carbonyl index and sulfoxide index could reflect the Aging degree of asphalt well. Moreover, due to the presence of CR and SBS at the same time, the Aging process of CR/SBSCMA was different from CRMA and SBSMA. In the Aging process of CR/SBSCMA, the modifiers degradation products and asphalt secondary components reacted severely, which resulted in the decrease of aromatics and resin and the increase of asphaltenes and toluene insoluble. Meanwhile, the distribution and colloid structure of composite modified asphalt were changed by the modifiers degradation products, the asphalt secondary components and their reaction products, so were the macroscopic properties of CR/SBSCMA.
Shane B Underwood - One of the best experts on this subject based on the ideXlab platform.
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effects of Oxidative Aging on asphalt mixture properties
Transportation Research Record, 2012Co-Authors: Cheolmin Baek, Shane B UnderwoodAbstract:Aging has long been recognized as a contributing factor to fatigue distress of asphalt concrete pavement. Several research studies have been undertaken to gain fundamental understanding of the Aging phenomenon at the asphalt binder level. However, relatively little effort has been made to understand and to quantify the effects of Aging on fundamental characteristics of asphalt mixtures. The effects of Oxidative Aging on the dynamic modulus and the fatigue performance of asphalt mixtures is examined. For this purpose, an asphalt mixture is aged in the laboratory at four Aging levels. Mechanical tests for the four aged mixtures are performed to characterize the linear viscoelastic and damage properties. Such characterization is investigated to incorporate the Aging effects into a more comprehensive analytical framework for predicting the performance of asphalt concrete pavements. Finally, this framework is used to evaluate the Aging effects on an example asphalt concrete pavement. It is found that Aging can...
Kai Wang - One of the best experts on this subject based on the ideXlab platform.
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the change of thermal mechanical properties and chemical structure of ambient cured dgeba tepa under accelerated thermo Oxidative Aging
Polymer Degradation and Stability, 2013Co-Authors: Ke Li, Kai Wang, Maosheng Zhan, Wen XuAbstract:Abstract The thermal–mechanical properties and chemical structure of ambient cured DGEBA/TEPA during thermo-Oxidative Aging were investigated in this paper. Results from Differential Scanning Calorimetry (DSC) experiments revealed that it was difficult for this ambient cured DGEBA/TEPA system to cure completely even after a long period. Dynamic Mechanical Thermal Analysis (DMTA) curves demonstrated a post-cure reaction occurred in the early period of Aging and then an additional transition peak emerged at a lower temperature, whose intensity increased with the Aging time. FTIR Spectroscopy showed that the O–H and CH 2 groups were oxidized to carbonyl groups and the main chains were degraded to the lower molecular weight compounds during thermo-Oxidative Aging process. The additional peak in DMTA curves are related to these lower molecule weight compounds. X-ray Photoelectron Spectroscopy (XPS) results further manifested that the formation of the additional peak derived from the degradation of main chains near the surface in the sample and the effect of oxidation increased with decreasing depth.
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thermal Oxidative Aging of dgeba epn lmpa epoxy system chemical structure and thermal mechanical properties
Polymer Degradation and Stability, 2011Co-Authors: Kai Wang, Maosheng Zhan, Wen Xu, Xiaojun DingAbstract:Abstract The evolvement of chemical structure and thermal–mechanical properties of diglycidyl ether of bisphenol-A and novolac epoxy resin blends cured with low molecular polyamide (DGEBA/EPN/LMPA system) during thermal-Oxidative Aging were investigated by Attenuated Total Reflectance Fourier Transform Infrared spectrometry (ATR-FTIR) and Dynamic Mechanical Thermal Analysis (DMTA). The results revealed that the chemical reactions during thermal-Oxidative Aging contained oxidation and chain scission. Some possible chemical reaction processes were given. There was a new compound formed during Aging processes and the change of its glass transition temperature ( T g ) with Aging time followed an exponential law. In addition, the changes of dynamic mechanical behavior of this epoxy system aged at four different temperatures (110 °C, 130 °C, 150 °C, 170 °C) were compared. An empirical formula was obtained through kinetic analysis and this formula can be used to predict the Oxidative degree of the surface at different Aging temperature.
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Thermal-Oxidative Aging of DGEBA/EPN/LMPA epoxy system: Chemical structure and thermal–mechanical properties
Polymer Degradation and Stability, 2011Co-Authors: Kai Wang, Maosheng Zhan, Wen Xu, Xiaojun DingAbstract:Abstract The evolvement of chemical structure and thermal–mechanical properties of diglycidyl ether of bisphenol-A and novolac epoxy resin blends cured with low molecular polyamide (DGEBA/EPN/LMPA system) during thermal-Oxidative Aging were investigated by Attenuated Total Reflectance Fourier Transform Infrared spectrometry (ATR-FTIR) and Dynamic Mechanical Thermal Analysis (DMTA). The results revealed that the chemical reactions during thermal-Oxidative Aging contained oxidation and chain scission. Some possible chemical reaction processes were given. There was a new compound formed during Aging processes and the change of its glass transition temperature ( T g ) with Aging time followed an exponential law. In addition, the changes of dynamic mechanical behavior of this epoxy system aged at four different temperatures (110 °C, 130 °C, 150 °C, 170 °C) were compared. An empirical formula was obtained through kinetic analysis and this formula can be used to predict the Oxidative degree of the surface at different Aging temperature.
