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Henglong Zhang – One of the best experts on this subject based on the ideXlab platform.

  • physical rheological and chemical characterization of Aging behaviors of thermochromic asphalt binder
    Fuel, 2018
    Co-Authors: Henglong Zhang, Zihao Chen, Guoqing Xu

    Abstract:

    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.

  • Investigation of Aging performance of SBS modified asphalt with various Aging methods
    Construction and Building Materials, 2017
    Co-Authors: Dongmei Zhang, Henglong Zhang, Caijun Shi

    Abstract:

    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.

  • Physical, Rheological, and Aging Properties of Bitumen Containing Organic Expanded Vermiculite and Nano-Zinc Oxide
    Journal of Materials in Civil Engineering, 2016
    Co-Authors: Henglong Zhang, Chongzheng Zhu, Dongliang Kuang

    Abstract:

    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…

Lihui Xue – One of the best experts on this subject based on the ideXlab platform.

  • synthesis and characterization of triethoxyvinylsilane surface modified layered double hydroxides and application in improving uv Aging resistance of bitumen
    Applied Clay Science, 2016
    Co-Authors: Canli Zhang, Lihui Xue, Kai Feng, Dong Xie

    Abstract:

    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.

  • effect of expanded vermiculite on microstructures and Aging properties of styrene butadiene styrene copolymer modified bitumen
    Construction and Building Materials, 2013
    Co-Authors: Henglong Zhang, Xiaojua Jia, Lihui Xue

    Abstract:

    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.

  • Effect of expanded vermiculite on microstructures and Aging properties of styrene–butadiene–styrene copolymer modified bitumen
    Construction and Building Materials, 2013
    Co-Authors: Henglong Zhang, Xiaojuan Jia, Lihui Xue

    Abstract:

    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.

Caiju Shi – One of the best experts on this subject based on the ideXlab platform.

  • effect of organic layered silicate on microstructures and Aging properties of styrene butadiene styrene copolymer modified bitumen
    Construction and Building Materials, 2014
    Co-Authors: Henglong Zhang, Chongzheng Zhu, Caiju Shi

    Abstract:

    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.