The Experts below are selected from a list of 30477 Experts worldwide ranked by ideXlab platform
Henglong Zhang - One of the best experts on this subject based on the ideXlab platform.
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physical rheological and chemical characterization of Aging behaviors of thermochromic asphalt binder
Fuel, 2018Co-Authors: Henglong Zhang, Zihao Chen, Guoqing XuAbstract:Abstract As an innovative road material, thermochromic asphalt binder has great effect on keeping the surface temperature of pavement within relatively reasonable range. The objective of this paper was to investigate the anti-Aging properties of asphalts containing 0, 2, 4, 6, 8% content of black thermochromic powders (named as blank sample, 2, 4, 6, 8% BTP binder for convenience). Three Aging methods, including thin film oven test, pressure Aging vessel test and ultraviolet radiation, were applied to simulate thermal and photo oxidation Aging of asphalt, respectively. Physical and rheological properties of binders with and without thermochromic powders were measured before and after three Aging methods. The results show that the introduction of black thermochromic powders could improve thermal stability and low-temperature cracking performance of asphalt binder. After three Aging methods, all of thermochromic asphalt binders exhibit better Aging resistance than blank sample by physical, rheological Aging indices, and 4% is the optimal content in which thermochromic asphalt binder synthetically exhibits the best Aging resistance. In addition, based on grey relational analysis (GRA), the Aging indices of complex modulus Aging Index (CAI) and viscosity Aging Index (VAI) are more reliable in Aging evaluation.
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Investigation of Aging performance of SBS modified asphalt with various Aging methods
Construction and Building Materials, 2017Co-Authors: Dongmei Zhang, Henglong Zhang, Caijun ShiAbstract:Abstract Two kinds of base asphalts (penetration 70 and 90) were used for preparing styrene-butadiene-styrene block copolymers (SBS) modified asphalts. The obtained two kinds of SBS modified asphalts were designated as SBS-70 and SBS-90. Then three types of Aging methods such as thin film oven test (TFOT), pressure Aging vessel (PAV), and ultraviolet (UV) radiation were applied. The effects of each Aging method on the physical characteristics, rheological property and chemical composition of the binders were studied. The Fourier Transform Infrared Spectroscopy (FTIR) was used to measure the chemical structures of modified asphalts. The morphological characteristic of SBS modified asphalts was determined using fluorescence microscope (FM). The results show that SBS-90 displays the higher retained penetration and ductility as well as the lower viscosity Aging Index in comparison with SBS-70, which is in accordance with the Aging results of base asphalt. According to the rheological test, SBS-90 shows a larger complex modulus Aging Index and a smaller phase angle Aging Index than that of SBS-70. All the above results indicate that the Aging degree of SBS-90 is higher than SBS-70. This conclusion also can be proved by the results of FTIR and FM analysis. In addition, compared with PAV Aging, UV Aging shows more obvious influence on the degradation of SBS copolymer.
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Physical, Rheological, and Aging Properties of Bitumen Containing Organic Expanded Vermiculite and Nano-Zinc Oxide
Journal of Materials in Civil Engineering, 2016Co-Authors: Henglong Zhang, Chongzheng Zhu, Dongliang KuangAbstract:AbstractThis work investigates a novel bitumen modification by use of organic expanded vermiculite (OEVMT) and a nano-zinc oxide (nano-ZnO) compound. The content of OEVMT is 1% by mass of bitumen, while that of nano-ZnO is 1, 2, 3, and 4% by mass of bitumen. The binders were aged according to the thin-film oven test (TFOT), pressure Aging vessel (PAV) test, and ultraviolet (UV) radiation, respectively. The effect of the OEVMT and nano-ZnO compound on the physical and rheological properties of bitumen before and after Aging was investigated. The results show that the high-temperature stability of bitumen can be enhanced, while the other physical properties of bitumen are slightly influenced with the introduction of OEVMT and the nano-ZnO compound. As a result of TFOT, PAV, and UV Aging, OEVMT and nano-ZnO modified bitumens show lower viscosity Aging Index, softening-point increment, phase angle Aging Index, and complex modulus Aging Index, and higher retained penetration in comparison with base bitumen, in...
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rheological examination of Aging in bitumen with inorganic nanoparticles and organic expanded vermiculite
Construction and Building Materials, 2015Co-Authors: Zihao Chen, Henglong Zhang, Bin ZhaoAbstract:Abstract Bituminous pavement is vulnerable to Aging during construction and service life, which can seriously affect the rheological properties of bitumen. A novel modified bitumen containing inorganic nanoparticles and organic expanded vermiculite (OEVMT) compound was evaluated in this paper. The binders were aged according to the thin film oven test (TFOT), pressure Aging vessel (PAV) test and ultraviolet (UV) radiation, respectively. The effect of different inorganic nanoparticles (nano-titania, nano-zinc oxide, nano-silica) and OEVMT compound on rheological properties of bitumen before and after Aging is investigated. The base bitumen is modified with 1% OEVMT by mass of bitumen and different content inorganic nanoparticles, which are 1%, 2% and 3% nano-titania (nano-TiO 2 ), 3% nano-zinc oxide (nano-ZnO) and 3% nano-silica (nano-SiO 2 ). The microstructures of expanded vermiculite (EVMT), OEVMT and separated OEVMT from modified bitumen were characterized by X-ray diffraction (XRD). The results show that the OEVMT/bitumen forms the exfoliated nanostructures. The complex modulus of bitumen is increased, while the phase angle is decreased with the introduction of compound modifiers. As a result of TFOT, PAV and UV Aging, inorganic nanoparticles and OEVMT modified bitumens show the higher phase angle Aging Index and the lower complex modulus Aging Index in comparison with base bitumen, which indicates their good thermal oxidation and UV Aging resistance. Moreover, based on nano-TiO 2 content effect, the recommended content is 1% OEVMT + 3% nano-TiO 2 by rheological properties results before and after three Aging methods. Under the same compound modifiers content, the compound modified bitumen containing nano-ZnO shows better Aging resistance than the compound modified bitumen containing nano-TiO 2 or nano-SiO 2 .
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influence of surface modification on physical and ultraviolet Aging resistance of bitumen containing inorganic nanoparticles
Construction and Building Materials, 2015Co-Authors: Henglong Zhang, Jianying Yu, Dongmei ZhangAbstract:Abstract Three inorganic nanoparticles (nano-SiO2, nano-TiO2, nano-ZnO) were adopted to improve the ultraviolet (UV) Aging properties of bitumen. Inorganic nanoparticles were surface modified by silane coupling agent. The compatibility between inorganic nanoparticles and bitumen was studied by high temperature storage stability test. More attention had been paid to the effect of surface modification on physical and UV Aging properties of inorganic nanoparticles modified bitumens. The results showed that the compatibility between inorganic nanoparticles and bitumen was improved obviously by surface modification. Under the same content, the difference between the softening points as well as the nanoparticles contents in the upper and lower sections of the toothpaste tubes was decreased remarkably after surface modification. The penetration and ductility were decreased, while the softening point and viscosity of bitumen were increased with the addition of inorganic nanoparticles. However, this influence was weakened after surface modification of inorganic nanoparticles and the weakening effect of surface modified nano-ZnO was the most obvious. As a result of UV Aging, softening point increment and viscosity Aging Index of bitumen were decreased by inorganic nanoparticles. The UV Aging resistance of modified bitumen was further enhanced by surface modification of inorganic nanoparticles, and nano-ZnO modified bitumen showed the best UV Aging resistance after surface modification.
Lihui Xue - One of the best experts on this subject based on the ideXlab platform.
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synthesis and characterization of triethoxyvinylsilane surface modified layered double hydroxides and application in improving uv Aging resistance of bitumen
Applied Clay Science, 2016Co-Authors: Canli Zhang, Lihui Xue, Kai Feng, Dong XieAbstract:Abstract Layered double hydroxides (LDH) surface modified by triethoxyvinylsilane (TEVS) was prepared and characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and Ultraviolet and visible (UV–Vis) spectrophotometry. FTIR and XRD showed that TEVS has been successfully grafted onto the surface of LDH. Compared with LDH, the agglomeration between the TEVS surface modified LDH (TEVS-LDH) particles was obviously weakened according to SEM. UV–Vis reflectance and absorbance analyses indicated that TEVS-LDH possessed better UV reflectance and absorbance than that of LDH. Then the effects of TEVS-LDH and LDH on the physical and anti-Aging properties of bitumen were thoroughly evaluated. The storage stability test showed that TEVS-LDH existed more stably than LDH in bitumen, which was due to the surface modification of LDH which improved the compatibility between LDH and bitumen. The results of physical properties tests showed that TEVS-LDH improved high-temperature behavior and had a less pronounced effect on the low temperature ductility of bitumen in contrast with LDH. Aging indices (viscosity Aging Index, softening point increment and ductility retention rate) and FTIR showed that TEVS-LDH exhibited better improvement than LDH on anti-ultraviolet Aging of bitumen.
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effect of expanded vermiculite on microstructures and Aging properties of styrene butadiene styrene copolymer modified bitumen
Construction and Building Materials, 2013Co-Authors: Henglong Zhang, Xiaojua Jia, Lihui XueAbstract:Abstract Organic expanded vermiculites (OEVMTs) were prepared using cetyltrimethyl ammonium bromide (CTAB) and octadecyl dimethyl benzyl ammonium chloride (ODBA) as intercalation agents. Effect of EVMT organic modification on physical and Aging properties of styrene–butadiene–styrene (SBS) modified bitumen was investigated. The microstructures of the binders were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM), respectively. EVMT/SBS modified bitumen forms a phase-separated structure, while OEVMT/SBS modified bitumens form the exfoliated nanostructures according to XRD analysis. OEVMTs show the more obvious influence on physical properties of SBS modified bitumen in comparison with EVMT. The compatibility between the EVMT and SBS modified bitumen is also improved after organic modification of EVMT. AFM analysis indicates that the contrast between the dispersed phase and the matrix phase in SBS modified bitumen increases with the addition of ODBA-EVMT. As a result of thin film oven test (TFOT), the viscosity Aging Index of SBS modified bitumen decreases, while the retained ductility and penetration increase obviously with the introduction of EVMT and OEVMTs. ODBA-EVMT/SBS modified bitumen has more pronounced improvements in Aging resistance of SBS modified bitumen in comparison with CTAB-EVMT/SBS modified bitumen by preventing the phase-separated trend of the SBS modified bitumen during TFOT.
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Effect of expanded vermiculite on microstructures and Aging properties of styrene–butadiene–styrene copolymer modified bitumen
Construction and Building Materials, 2013Co-Authors: Henglong Zhang, Xiaojuan Jia, Lihui XueAbstract:Abstract Organic expanded vermiculites (OEVMTs) were prepared using cetyltrimethyl ammonium bromide (CTAB) and octadecyl dimethyl benzyl ammonium chloride (ODBA) as intercalation agents. Effect of EVMT organic modification on physical and Aging properties of styrene–butadiene–styrene (SBS) modified bitumen was investigated. The microstructures of the binders were characterized by X-ray diffraction (XRD) and atomic force microscopy (AFM), respectively. EVMT/SBS modified bitumen forms a phase-separated structure, while OEVMT/SBS modified bitumens form the exfoliated nanostructures according to XRD analysis. OEVMTs show the more obvious influence on physical properties of SBS modified bitumen in comparison with EVMT. The compatibility between the EVMT and SBS modified bitumen is also improved after organic modification of EVMT. AFM analysis indicates that the contrast between the dispersed phase and the matrix phase in SBS modified bitumen increases with the addition of ODBA-EVMT. As a result of thin film oven test (TFOT), the viscosity Aging Index of SBS modified bitumen decreases, while the retained ductility and penetration increase obviously with the introduction of EVMT and OEVMTs. ODBA-EVMT/SBS modified bitumen has more pronounced improvements in Aging resistance of SBS modified bitumen in comparison with CTAB-EVMT/SBS modified bitumen by preventing the phase-separated trend of the SBS modified bitumen during TFOT.
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investigation of microstructures and ultraviolet Aging properties of organo montmorillonite sbs modified bitumen
Materials Chemistry and Physics, 2011Co-Authors: Henglong Zhang, Huacai Wang, Lihui XueAbstract:Abstract Organo-montmorillonite(OMMT)/Styrene-butadiene-styrene(SBS) modified bitumen nanocomposites were prepared by melt blending. The microstructures of OMMT/SBS modified bitumen were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM), respectively. The effect of OMMT on ultraviolet (UV) Aging properties of SBS modified bitumen was investigated. FTIR and XRD analyses indicate that the OMMT/SBS modified bitumen forms an intercalated structure. It is observed that the phase contrast between the dispersed domains and the matrix is inverted in SBS modified bitumen, which is decreased with the introduction of OMMT according to AFM analysis. As a result of UV Aging, both viscosity Aging Index and softening point increment of OMMT/SBS modified bitumen decrease significantly. There is a single phase trend in the morphology of the bitumen after Aging, which is accelerated by the existence of SBS. However, these changes can be effectively prevented under the influence of OMMT, indicating the good UV Aging resistance of OMMT/SBS modified bitumen.
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Investigation of microstructures and ultraviolet Aging properties of organo-montmorillonite/SBS modified bitumen
Materials Chemistry and Physics, 2011Co-Authors: Henglong Zhang, Huacai Wang, Lihui XueAbstract:Abstract Organo-montmorillonite(OMMT)/Styrene-butadiene-styrene(SBS) modified bitumen nanocomposites were prepared by melt blending. The microstructures of OMMT/SBS modified bitumen were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM), respectively. The effect of OMMT on ultraviolet (UV) Aging properties of SBS modified bitumen was investigated. FTIR and XRD analyses indicate that the OMMT/SBS modified bitumen forms an intercalated structure. It is observed that the phase contrast between the dispersed domains and the matrix is inverted in SBS modified bitumen, which is decreased with the introduction of OMMT according to AFM analysis. As a result of UV Aging, both viscosity Aging Index and softening point increment of OMMT/SBS modified bitumen decrease significantly. There is a single phase trend in the morphology of the bitumen after Aging, which is accelerated by the existence of SBS. However, these changes can be effectively prevented under the influence of OMMT, indicating the good UV Aging resistance of OMMT/SBS modified bitumen.
Caiju Shi - One of the best experts on this subject based on the ideXlab platform.
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effect of organic layered silicate on microstructures and Aging properties of styrene butadiene styrene copolymer modified bitumen
Construction and Building Materials, 2014Co-Authors: Henglong Zhang, Chongzheng Zhu, Caiju ShiAbstract:Abstract A new approach to determine the microstructures of organic layered silicate/SBS modified bitumen was adopted by combining the results from X-ray diffraction analysis of organic layered silicate/SBS modified bitumen and the dissolving–filtrating procedure. The effect of thin film oven test (TFOT) and ultraviolet (UV) Aging on the morphology of binders was characterized by using optical microscopy. The results show that organic montmorillonite/SBS modified bitumen and organic rectorite/SBS modified bitumen form the semi-exfoliated nanostructure, while organic expanded vermiculite/SBS modified bitumen forms the exfoliated nanostructure. The high temperature properties of SBS modified bitumen and the compatibility between SBS and bitumen are improved with the introduction of organic layered silicate. Compared with SBS modified bitumen, organic layered silicate/SBS modified bitumen shows the lower viscosity Aging Index and the higher retained ductility after TFOT and UV Aging. Aging influences the morphology of SBS modified bitumen significantly. There is a single phase trend of SBS modified bitumen during TFOT, which is accelerated by UV radiation. However, the morphological changes are prevented obviously with the introduction of organic layered silicate, indicating the good Aging resistance of organic layered silicate/SBS modified bitumen. Additionally, the influence of organic layered silicate on these physical properties of SBS modified bitumen before and after Aging depends on its nature.
Dongmei Zhang - One of the best experts on this subject based on the ideXlab platform.
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Investigation of Aging performance of SBS modified asphalt with various Aging methods
Construction and Building Materials, 2017Co-Authors: Dongmei Zhang, Henglong Zhang, Caijun ShiAbstract:Abstract Two kinds of base asphalts (penetration 70 and 90) were used for preparing styrene-butadiene-styrene block copolymers (SBS) modified asphalts. The obtained two kinds of SBS modified asphalts were designated as SBS-70 and SBS-90. Then three types of Aging methods such as thin film oven test (TFOT), pressure Aging vessel (PAV), and ultraviolet (UV) radiation were applied. The effects of each Aging method on the physical characteristics, rheological property and chemical composition of the binders were studied. The Fourier Transform Infrared Spectroscopy (FTIR) was used to measure the chemical structures of modified asphalts. The morphological characteristic of SBS modified asphalts was determined using fluorescence microscope (FM). The results show that SBS-90 displays the higher retained penetration and ductility as well as the lower viscosity Aging Index in comparison with SBS-70, which is in accordance with the Aging results of base asphalt. According to the rheological test, SBS-90 shows a larger complex modulus Aging Index and a smaller phase angle Aging Index than that of SBS-70. All the above results indicate that the Aging degree of SBS-90 is higher than SBS-70. This conclusion also can be proved by the results of FTIR and FM analysis. In addition, compared with PAV Aging, UV Aging shows more obvious influence on the degradation of SBS copolymer.
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influence of surface modification on physical and ultraviolet Aging resistance of bitumen containing inorganic nanoparticles
Construction and Building Materials, 2015Co-Authors: Henglong Zhang, Jianying Yu, Dongmei ZhangAbstract:Abstract Three inorganic nanoparticles (nano-SiO2, nano-TiO2, nano-ZnO) were adopted to improve the ultraviolet (UV) Aging properties of bitumen. Inorganic nanoparticles were surface modified by silane coupling agent. The compatibility between inorganic nanoparticles and bitumen was studied by high temperature storage stability test. More attention had been paid to the effect of surface modification on physical and UV Aging properties of inorganic nanoparticles modified bitumens. The results showed that the compatibility between inorganic nanoparticles and bitumen was improved obviously by surface modification. Under the same content, the difference between the softening points as well as the nanoparticles contents in the upper and lower sections of the toothpaste tubes was decreased remarkably after surface modification. The penetration and ductility were decreased, while the softening point and viscosity of bitumen were increased with the addition of inorganic nanoparticles. However, this influence was weakened after surface modification of inorganic nanoparticles and the weakening effect of surface modified nano-ZnO was the most obvious. As a result of UV Aging, softening point increment and viscosity Aging Index of bitumen were decreased by inorganic nanoparticles. The UV Aging resistance of modified bitumen was further enhanced by surface modification of inorganic nanoparticles, and nano-ZnO modified bitumen showed the best UV Aging resistance after surface modification.
Huacai Wang - One of the best experts on this subject based on the ideXlab platform.
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investigation of microstructures and ultraviolet Aging properties of organo montmorillonite sbs modified bitumen
Materials Chemistry and Physics, 2011Co-Authors: Henglong Zhang, Huacai Wang, Lihui XueAbstract:Abstract Organo-montmorillonite(OMMT)/Styrene-butadiene-styrene(SBS) modified bitumen nanocomposites were prepared by melt blending. The microstructures of OMMT/SBS modified bitumen were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM), respectively. The effect of OMMT on ultraviolet (UV) Aging properties of SBS modified bitumen was investigated. FTIR and XRD analyses indicate that the OMMT/SBS modified bitumen forms an intercalated structure. It is observed that the phase contrast between the dispersed domains and the matrix is inverted in SBS modified bitumen, which is decreased with the introduction of OMMT according to AFM analysis. As a result of UV Aging, both viscosity Aging Index and softening point increment of OMMT/SBS modified bitumen decrease significantly. There is a single phase trend in the morphology of the bitumen after Aging, which is accelerated by the existence of SBS. However, these changes can be effectively prevented under the influence of OMMT, indicating the good UV Aging resistance of OMMT/SBS modified bitumen.
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Investigation of microstructures and ultraviolet Aging properties of organo-montmorillonite/SBS modified bitumen
Materials Chemistry and Physics, 2011Co-Authors: Henglong Zhang, Huacai Wang, Lihui XueAbstract:Abstract Organo-montmorillonite(OMMT)/Styrene-butadiene-styrene(SBS) modified bitumen nanocomposites were prepared by melt blending. The microstructures of OMMT/SBS modified bitumen were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM), respectively. The effect of OMMT on ultraviolet (UV) Aging properties of SBS modified bitumen was investigated. FTIR and XRD analyses indicate that the OMMT/SBS modified bitumen forms an intercalated structure. It is observed that the phase contrast between the dispersed domains and the matrix is inverted in SBS modified bitumen, which is decreased with the introduction of OMMT according to AFM analysis. As a result of UV Aging, both viscosity Aging Index and softening point increment of OMMT/SBS modified bitumen decrease significantly. There is a single phase trend in the morphology of the bitumen after Aging, which is accelerated by the existence of SBS. However, these changes can be effectively prevented under the influence of OMMT, indicating the good UV Aging resistance of OMMT/SBS modified bitumen.
