The Experts below are selected from a list of 96327 Experts worldwide ranked by ideXlab platform
Feipeng Xiao - One of the best experts on this subject based on the ideXlab platform.
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performance characteristics of terminal blend rubberized asphalt with sbs and polyphosphoric acid
Construction and Building Materials, 2017Co-Authors: Peng Lin, Weidong Huang, Naipeng Tang, Feipeng XiaoAbstract:Abstract Terminal Blend (TB) rubberized asphalt is a promising technology in producing crumb rubber asphalt as it overcomes the shortcomings such as lack of storage stability and workability. However, the limitation of TB asphalt is that the high Temperature Property is drastically reduced compared to conventional rubberized asphalt binders due to the degradation of crumb rubber. Currently, the studies regarding to modification to improve its high Temperature Property is not adequate. The objective of this paper is to investigate the optimum modification formula of asphalt binders using styrene-butadienestyrene (SBS) and polyphosphoric acid (PPA) and explore their mechanism of modification. Firstly, dynamic shear rheometer (DSR) test and bending beam rheometer (BBR) test were conducted to evaluate the rheological properties at both high and low Temperatures. Furthermore, Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC) test were conducted to detect the chemical changes of TB modified asphalt binders. Finally, the high Temperature stability and fatigue Property of TB modified asphalt mixtures were applied to verify the performance properties. Results indicates that 20T3S (20 wt% crumb rubber and 3 wt% SBS) used to produce the modified binders was the best modification formula considering both high and low Temperature rheological properties. The modification mechanism was that SBS formed 3D cross-linking network structure in TB binder, which played an important role in enhancing high Temperature properties of TB binders. Additionally, 20T3S asphalt mixture had better high Temperature stability and fatigue performance comparing to 4.5S (4.5 wt% SBS) modified asphalt mixture.
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evolution of components distribution and its effect on low Temperature properties of terminal blend rubberized asphalt binder
Construction and Building Materials, 2017Co-Authors: Weidong Huang, Naipeng Tang, Feipeng Xiao, Peng Lin, Weiyang Guan, Zengping ShanAbstract:Abstract The addition of crumb rubber modifier (CRM) could enhance the low Temperature properties of asphalt binder. However, in the production of terminal blend (TB) rubberized asphalt binder, the degradation of CRM results in the change of molecular components of TB rubberized asphalt binder. The effect of components evolution on low Temperature rheological behaviour of TB rubberized asphalt binder was not clear yet. The present study aims to investigate the evolution of components distribution and its effect on low Temperature properties of TB rubberized asphalt binders produced under various interaction Temperatures and interaction times. The solubility test and the Gel Permeation Chromatography (GPC) test were performed to obtain the distribution of insoluble components, dissolved polymers, apparent asphaltenes and maltenes in various TB rubberized asphalt binder. Bending Beam Rheometer (BBR) was conducted to investigate the low Temperature properties of TB rubberized asphalt binder before and after aging. Burgers model was used to retrieve the relaxation time at low Temperature. The results indicated that interaction time plays a more important role in promoting the dissolution of CRM whereas the interaction Temperature is more responsible for the breaking of backbone of the main chain of rubber. Low Temperature stiffness of TB rubberized asphalt binder increased with the degradation of CRM, which has a negative effect on low Temperature performance. Relaxation Property of TB rubberized asphalt binder was improved with the increase in percentage of apparent asphaltenes. However, the loss of relaxation Property of TB rubberized asphalt binder after aging is more remarkable with the gradual degradation of CRM. TB rubberized asphalt binder investigated in the present study exhibits better low Temperature performance than styrene-butadienestyrene (SBS) modified asphalt binder and base binder. The parameter ΔT c increases linearly with the reduction of insoluble components and dissolved polymers, which indicates that the low Temperature Property is becoming less m-value controlled with the degradation of CRM.
N N Bakhshi - One of the best experts on this subject based on the ideXlab platform.
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biodiesel production from mixtures of canola oil and used cooking oil
Chemical Engineering Journal, 2008Co-Authors: Titipong Issariyakul, Ajay K. Dalai, Mangesh G Kulkarni, Lekha Charan Meher, N N BakhshiAbstract:Abstract Used cooking oil (UCO) was mixed with canola oil at various ratios in order to make use of used cooking oil for production of biodiesel and also lower the cost of biodiesel production. Methyl and ethyl esters were prepared by means of KOH-catalyzed transesterification from the mixtures of both the oils. Water content, acid value and viscosity of most esters met ASTM standard except for ethyl esters prepared from used cooking oil. Canola oil content of at least 60% in the used cooking oil/canola oil feedstock is required in order to produce ethyl ester satisfying ASTM specifications. Although ethanolysis was proved to be more challenging, ethyl esters showed reduced crystallization Temperature (−45.0 to −54.4 °C) as compared to methyl esters (−35.3 to −43.0 °C). A somewhat better low-Temperature Property of ester was observed at higher used cooking oil to canola oil ratio in spite of similar fatty acid compositions of both oils.
Weidong Huang - One of the best experts on this subject based on the ideXlab platform.
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performance characteristics of terminal blend rubberized asphalt with sbs and polyphosphoric acid
Construction and Building Materials, 2017Co-Authors: Peng Lin, Weidong Huang, Naipeng Tang, Feipeng XiaoAbstract:Abstract Terminal Blend (TB) rubberized asphalt is a promising technology in producing crumb rubber asphalt as it overcomes the shortcomings such as lack of storage stability and workability. However, the limitation of TB asphalt is that the high Temperature Property is drastically reduced compared to conventional rubberized asphalt binders due to the degradation of crumb rubber. Currently, the studies regarding to modification to improve its high Temperature Property is not adequate. The objective of this paper is to investigate the optimum modification formula of asphalt binders using styrene-butadienestyrene (SBS) and polyphosphoric acid (PPA) and explore their mechanism of modification. Firstly, dynamic shear rheometer (DSR) test and bending beam rheometer (BBR) test were conducted to evaluate the rheological properties at both high and low Temperatures. Furthermore, Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC) test were conducted to detect the chemical changes of TB modified asphalt binders. Finally, the high Temperature stability and fatigue Property of TB modified asphalt mixtures were applied to verify the performance properties. Results indicates that 20T3S (20 wt% crumb rubber and 3 wt% SBS) used to produce the modified binders was the best modification formula considering both high and low Temperature rheological properties. The modification mechanism was that SBS formed 3D cross-linking network structure in TB binder, which played an important role in enhancing high Temperature properties of TB binders. Additionally, 20T3S asphalt mixture had better high Temperature stability and fatigue performance comparing to 4.5S (4.5 wt% SBS) modified asphalt mixture.
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evolution of components distribution and its effect on low Temperature properties of terminal blend rubberized asphalt binder
Construction and Building Materials, 2017Co-Authors: Weidong Huang, Naipeng Tang, Feipeng Xiao, Peng Lin, Weiyang Guan, Zengping ShanAbstract:Abstract The addition of crumb rubber modifier (CRM) could enhance the low Temperature properties of asphalt binder. However, in the production of terminal blend (TB) rubberized asphalt binder, the degradation of CRM results in the change of molecular components of TB rubberized asphalt binder. The effect of components evolution on low Temperature rheological behaviour of TB rubberized asphalt binder was not clear yet. The present study aims to investigate the evolution of components distribution and its effect on low Temperature properties of TB rubberized asphalt binders produced under various interaction Temperatures and interaction times. The solubility test and the Gel Permeation Chromatography (GPC) test were performed to obtain the distribution of insoluble components, dissolved polymers, apparent asphaltenes and maltenes in various TB rubberized asphalt binder. Bending Beam Rheometer (BBR) was conducted to investigate the low Temperature properties of TB rubberized asphalt binder before and after aging. Burgers model was used to retrieve the relaxation time at low Temperature. The results indicated that interaction time plays a more important role in promoting the dissolution of CRM whereas the interaction Temperature is more responsible for the breaking of backbone of the main chain of rubber. Low Temperature stiffness of TB rubberized asphalt binder increased with the degradation of CRM, which has a negative effect on low Temperature performance. Relaxation Property of TB rubberized asphalt binder was improved with the increase in percentage of apparent asphaltenes. However, the loss of relaxation Property of TB rubberized asphalt binder after aging is more remarkable with the gradual degradation of CRM. TB rubberized asphalt binder investigated in the present study exhibits better low Temperature performance than styrene-butadienestyrene (SBS) modified asphalt binder and base binder. The parameter ΔT c increases linearly with the reduction of insoluble components and dissolved polymers, which indicates that the low Temperature Property is becoming less m-value controlled with the degradation of CRM.
Peng Lin - One of the best experts on this subject based on the ideXlab platform.
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performance characteristics of terminal blend rubberized asphalt with sbs and polyphosphoric acid
Construction and Building Materials, 2017Co-Authors: Peng Lin, Weidong Huang, Naipeng Tang, Feipeng XiaoAbstract:Abstract Terminal Blend (TB) rubberized asphalt is a promising technology in producing crumb rubber asphalt as it overcomes the shortcomings such as lack of storage stability and workability. However, the limitation of TB asphalt is that the high Temperature Property is drastically reduced compared to conventional rubberized asphalt binders due to the degradation of crumb rubber. Currently, the studies regarding to modification to improve its high Temperature Property is not adequate. The objective of this paper is to investigate the optimum modification formula of asphalt binders using styrene-butadienestyrene (SBS) and polyphosphoric acid (PPA) and explore their mechanism of modification. Firstly, dynamic shear rheometer (DSR) test and bending beam rheometer (BBR) test were conducted to evaluate the rheological properties at both high and low Temperatures. Furthermore, Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC) test were conducted to detect the chemical changes of TB modified asphalt binders. Finally, the high Temperature stability and fatigue Property of TB modified asphalt mixtures were applied to verify the performance properties. Results indicates that 20T3S (20 wt% crumb rubber and 3 wt% SBS) used to produce the modified binders was the best modification formula considering both high and low Temperature rheological properties. The modification mechanism was that SBS formed 3D cross-linking network structure in TB binder, which played an important role in enhancing high Temperature properties of TB binders. Additionally, 20T3S asphalt mixture had better high Temperature stability and fatigue performance comparing to 4.5S (4.5 wt% SBS) modified asphalt mixture.
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evolution of components distribution and its effect on low Temperature properties of terminal blend rubberized asphalt binder
Construction and Building Materials, 2017Co-Authors: Weidong Huang, Naipeng Tang, Feipeng Xiao, Peng Lin, Weiyang Guan, Zengping ShanAbstract:Abstract The addition of crumb rubber modifier (CRM) could enhance the low Temperature properties of asphalt binder. However, in the production of terminal blend (TB) rubberized asphalt binder, the degradation of CRM results in the change of molecular components of TB rubberized asphalt binder. The effect of components evolution on low Temperature rheological behaviour of TB rubberized asphalt binder was not clear yet. The present study aims to investigate the evolution of components distribution and its effect on low Temperature properties of TB rubberized asphalt binders produced under various interaction Temperatures and interaction times. The solubility test and the Gel Permeation Chromatography (GPC) test were performed to obtain the distribution of insoluble components, dissolved polymers, apparent asphaltenes and maltenes in various TB rubberized asphalt binder. Bending Beam Rheometer (BBR) was conducted to investigate the low Temperature properties of TB rubberized asphalt binder before and after aging. Burgers model was used to retrieve the relaxation time at low Temperature. The results indicated that interaction time plays a more important role in promoting the dissolution of CRM whereas the interaction Temperature is more responsible for the breaking of backbone of the main chain of rubber. Low Temperature stiffness of TB rubberized asphalt binder increased with the degradation of CRM, which has a negative effect on low Temperature performance. Relaxation Property of TB rubberized asphalt binder was improved with the increase in percentage of apparent asphaltenes. However, the loss of relaxation Property of TB rubberized asphalt binder after aging is more remarkable with the gradual degradation of CRM. TB rubberized asphalt binder investigated in the present study exhibits better low Temperature performance than styrene-butadienestyrene (SBS) modified asphalt binder and base binder. The parameter ΔT c increases linearly with the reduction of insoluble components and dissolved polymers, which indicates that the low Temperature Property is becoming less m-value controlled with the degradation of CRM.
Naipeng Tang - One of the best experts on this subject based on the ideXlab platform.
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performance characteristics of terminal blend rubberized asphalt with sbs and polyphosphoric acid
Construction and Building Materials, 2017Co-Authors: Peng Lin, Weidong Huang, Naipeng Tang, Feipeng XiaoAbstract:Abstract Terminal Blend (TB) rubberized asphalt is a promising technology in producing crumb rubber asphalt as it overcomes the shortcomings such as lack of storage stability and workability. However, the limitation of TB asphalt is that the high Temperature Property is drastically reduced compared to conventional rubberized asphalt binders due to the degradation of crumb rubber. Currently, the studies regarding to modification to improve its high Temperature Property is not adequate. The objective of this paper is to investigate the optimum modification formula of asphalt binders using styrene-butadienestyrene (SBS) and polyphosphoric acid (PPA) and explore their mechanism of modification. Firstly, dynamic shear rheometer (DSR) test and bending beam rheometer (BBR) test were conducted to evaluate the rheological properties at both high and low Temperatures. Furthermore, Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC) test were conducted to detect the chemical changes of TB modified asphalt binders. Finally, the high Temperature stability and fatigue Property of TB modified asphalt mixtures were applied to verify the performance properties. Results indicates that 20T3S (20 wt% crumb rubber and 3 wt% SBS) used to produce the modified binders was the best modification formula considering both high and low Temperature rheological properties. The modification mechanism was that SBS formed 3D cross-linking network structure in TB binder, which played an important role in enhancing high Temperature properties of TB binders. Additionally, 20T3S asphalt mixture had better high Temperature stability and fatigue performance comparing to 4.5S (4.5 wt% SBS) modified asphalt mixture.
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evolution of components distribution and its effect on low Temperature properties of terminal blend rubberized asphalt binder
Construction and Building Materials, 2017Co-Authors: Weidong Huang, Naipeng Tang, Feipeng Xiao, Peng Lin, Weiyang Guan, Zengping ShanAbstract:Abstract The addition of crumb rubber modifier (CRM) could enhance the low Temperature properties of asphalt binder. However, in the production of terminal blend (TB) rubberized asphalt binder, the degradation of CRM results in the change of molecular components of TB rubberized asphalt binder. The effect of components evolution on low Temperature rheological behaviour of TB rubberized asphalt binder was not clear yet. The present study aims to investigate the evolution of components distribution and its effect on low Temperature properties of TB rubberized asphalt binders produced under various interaction Temperatures and interaction times. The solubility test and the Gel Permeation Chromatography (GPC) test were performed to obtain the distribution of insoluble components, dissolved polymers, apparent asphaltenes and maltenes in various TB rubberized asphalt binder. Bending Beam Rheometer (BBR) was conducted to investigate the low Temperature properties of TB rubberized asphalt binder before and after aging. Burgers model was used to retrieve the relaxation time at low Temperature. The results indicated that interaction time plays a more important role in promoting the dissolution of CRM whereas the interaction Temperature is more responsible for the breaking of backbone of the main chain of rubber. Low Temperature stiffness of TB rubberized asphalt binder increased with the degradation of CRM, which has a negative effect on low Temperature performance. Relaxation Property of TB rubberized asphalt binder was improved with the increase in percentage of apparent asphaltenes. However, the loss of relaxation Property of TB rubberized asphalt binder after aging is more remarkable with the gradual degradation of CRM. TB rubberized asphalt binder investigated in the present study exhibits better low Temperature performance than styrene-butadienestyrene (SBS) modified asphalt binder and base binder. The parameter ΔT c increases linearly with the reduction of insoluble components and dissolved polymers, which indicates that the low Temperature Property is becoming less m-value controlled with the degradation of CRM.
