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Henglong Zhang
Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, PR China

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Journal article
Published: 20 August 2021 in Fuel
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The multi-dimensional nanomaterial modifier composed of nano-zinc oxide (nano-ZnO) and expanded vermiculite (EVMT) can significantly improve resistance to thermo-oxidative and ultraviolet radiation aging and road performances of bitumen. However, the nano-ZnO particles are susceptible to agglomeration and the homogeneity between nano-ZnO particles and EVMT is hard to be achieved in bitumen. In the study, a new bitumen modifier, a combination of ZnO particles and EVMT, was developed by composite technology to reduce or avoid the agglomeration of the ZnO particles and generate a synergistic effect on bitumen properties, especially for the aging resistance of bitumen. The newly developed modifier was synthesized with a modified hydrolytic precipitation method and characterized by X-ray diffractometer (XRD), field emission scanning microscope (FESEM), Fourier transform infrared spectrometer (FTIR), and UV–Visible spectrometer. Further, the modified bitumen was prepared and then aged with thin-film oven aging test (TFOT), pressure aging vessel (PAV), and ultraviolet (UV) radiation aging methods, respectively. Finally, the effects of modifiers on physical, rheological, and aging resistance of bitumen were evaluated. Results showed that with the synthesis operation, ZnO particles homogeneously loaded on the surface of EVMT, greatly restraining ZnO particles agglomeration and achieving the homogeneity between ZnO and EVMT. Furthermore, due to higher softening point, ductility, and complex modulus values for the modified bitumen compared with that of unmodified bitumen, the introduction of the newly developed modifier can potentially enhance the low-temperature tensile properties and deformation resistance of bitumen. Meanwhile, when the bitumen is exposed to various environmental factors, such as heat, oxygen, and UV radiation, the composites modifier in bitumen can synergistically play a role in reducing the effects on bitumen aging. For that, regardless of aging methods, the introduction of ZnO/EVMT into bitumen can efficiently retard its softening point increase and mobility deterioration, namely, hinder bitumen aging. Therefore, the newly developed modifier, ZnO/EVMT, is promising in both resisting bitumen aging and improving bitumen properties at low and high temperatures, and thus a longer service life for bitumen pavement can be expected with its application.

ACS Style

Henglong Zhang; Haihui Duan; Huan Luo; Caijun Shi. Synthesis, characterization and utilization of zinc oxide/expanded vermiculite composite for bitumen modification. Fuel 2021, 306, 121731 .

AMA Style

Henglong Zhang, Haihui Duan, Huan Luo, Caijun Shi. Synthesis, characterization and utilization of zinc oxide/expanded vermiculite composite for bitumen modification. Fuel. 2021; 306 ():121731.

Chicago/Turabian Style

Henglong Zhang; Haihui Duan; Huan Luo; Caijun Shi. 2021. "Synthesis, characterization and utilization of zinc oxide/expanded vermiculite composite for bitumen modification." Fuel 306, no. : 121731.

Journal article
Published: 27 April 2021 in Construction and Building Materials
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Polyurethane/epoxy resin modified asphalt (PEA) has substantial potential in functioning as adhesive layer material for steel-ultra high performance concrete (UHPC) composite bridge deck pavements. In this research, the curing process of PEA was analyzed by Fourier transform infrared spectroscopy (FTIR) and fluorescence microscopy (FM) tests. Furthermore, mechanical and engineering performances of PEA were evaluated and further compared with those of styrene-butadiene-styrene (SBS) modified asphalt by viscosity test, tensile test, pull-out test, and dynamic shear rheometer (DSR) test. Results indicate that during the curing process of PEA, the polyurethane/epoxy resin undergoes a reaction with curing agent to form an interpenetrating polymer network (IPN) structure with a phase transition of polyurethane/epoxy resin from a dispersed phase to a continuous phase. The viscosity of PEA is affected by the asphalt content and temperature. PEA possesses excellent mechanical properties due to the formation of IPN structure and the toughening effect of asphalt. The high-temperature stability of PEA is far better than that of SBS modified asphalt. Additionally, the low-temperature cracking resistance and waterproof performances of PEA can meet the requirements of the adhesive layer well.

ACS Style

Qiusheng He; Henglong Zhang; Jia Li; Haihui Duan. Performance evaluation of polyurethane/epoxy resin modified asphalt as adhesive layer material for steel-UHPC composite bridge deck pavements. Construction and Building Materials 2021, 291, 123364 .

AMA Style

Qiusheng He, Henglong Zhang, Jia Li, Haihui Duan. Performance evaluation of polyurethane/epoxy resin modified asphalt as adhesive layer material for steel-UHPC composite bridge deck pavements. Construction and Building Materials. 2021; 291 ():123364.

Chicago/Turabian Style

Qiusheng He; Henglong Zhang; Jia Li; Haihui Duan. 2021. "Performance evaluation of polyurethane/epoxy resin modified asphalt as adhesive layer material for steel-UHPC composite bridge deck pavements." Construction and Building Materials 291, no. : 123364.

Journal article
Published: 15 February 2021 in Construction and Building Materials
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The time-temperature superposition principle (TTSP) is frequently applied in rheological characterization of styrene-butadiene−styrene triblock copolymer (SBS) modified bitumen (SBSMB). The time-temperature superposition relationship is traditionally determined through optimizing the horizontal displacement of isothermal curves to minimize the errors between measured and predicted rheological data. Different from traditional method, the newly proposed method can determine the time-temperature superposition relationship of SBSMB according to its special points of phase angle plateau regions in isochronal curves. Nevertheless, the validity of this new method is only demonstrated for limited sources of SBSMB in previous study. In present paper, the effects of bitumen source, modifier type and aging on validity of the newly proposed method for determining the time-temperature superposition relationship of SBSMB were investigated. The results indicated that the shape of phase angle plateau region can be totally sorted into “convex” and “S” two types for all kinds of SBSMB samples. Although the rheological properties of SBSMB are affected by different bitumen sources and modifier types, the proposed method is demonstrated to be applicable to SBSMB samples prepared by different bitumen sources and modifier types. The proposed method cannot be applied to short-term or long-term aged SBSMB samples due to disappearance of phase angle plateau region. And the shift factors of original SBSMB obtained from the newly proposed method are no longer suitable for its aged SBSMB samples.

ACS Style

Zihao Chen; Henglong Zhang; Xinqi Liu; Haihui Duan. A novel method for determining the time-temperature superposition relationship of SBS modified bitumen: Effects of bitumen source, modifier type and aging. Construction and Building Materials 2021, 280, 122549 .

AMA Style

Zihao Chen, Henglong Zhang, Xinqi Liu, Haihui Duan. A novel method for determining the time-temperature superposition relationship of SBS modified bitumen: Effects of bitumen source, modifier type and aging. Construction and Building Materials. 2021; 280 ():122549.

Chicago/Turabian Style

Zihao Chen; Henglong Zhang; Xinqi Liu; Haihui Duan. 2021. "A novel method for determining the time-temperature superposition relationship of SBS modified bitumen: Effects of bitumen source, modifier type and aging." Construction and Building Materials 280, no. : 122549.

Journal article
Published: 11 December 2020 in Construction and Building Materials
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Styrene-butadiene rubber modified asphalt (SBRMA) possesses the excellent low-temperature performance. Nevertheless, SBR copolymer is vulnerable to being decomposed when exposed to high-temperature and oxygen-rich environment during asphalt mixture mixing and compaction processes, which seriously compromises the improving effects of styrene-butadiene rubber (SBR) on thermal cracking resistance of asphalt binder. Therefore, reducing preparation temperatures of SBRMA mixture is a preferable way which can effectively enhance the performance of short-term aged SBRMA. In this research, in order to reduce the temperature during SBRMA mixture fabrication, three additives including Sasobit, epoxidized soybean oil (ESO) and Sasobit/ESO composite were chosen, and the effects of additives on physical, rheological properties of SBRMA, the chemical interactions between SBRMA and additives and their mixture preparation temperatures were evaluated. In addition, the effects of reduced short-term aging temperature by additives on performance of SBRMA and its mixture were investigated through physical, rheological, morphological and mechanical analyses. The results indicate that compared with Sasobit and ESO, Sasobit/ESO composite not only shows the better lowering effect on mixture preparation temperatures, but also can compensate for the adverse effects when Sasobit or ESO is added separately and enhance the high- and low-temperature performance of SBRMA concurrently. The reduced short-term aging temperature by Sasobit/ESO is beneficial to mitigating the adverse impacts of aging on performance of SBRMA. Moreover, adding Sasobit/ESO composite can enhance the thermal cracking resistance of SBRMA mixture.

ACS Style

Qishi Li; Henglong Zhang; Zihao Chen. Improvement of short-term aging resistance of styrene-butadiene rubber modified asphalt by Sasobit and epoxidized soybean oil. Construction and Building Materials 2020, 271, 121870 .

AMA Style

Qishi Li, Henglong Zhang, Zihao Chen. Improvement of short-term aging resistance of styrene-butadiene rubber modified asphalt by Sasobit and epoxidized soybean oil. Construction and Building Materials. 2020; 271 ():121870.

Chicago/Turabian Style

Qishi Li; Henglong Zhang; Zihao Chen. 2020. "Improvement of short-term aging resistance of styrene-butadiene rubber modified asphalt by Sasobit and epoxidized soybean oil." Construction and Building Materials 271, no. : 121870.

Journal article
Published: 14 October 2020 in Fuel
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Developing a reliable method for separating styrene-butadiene-styrene triblock copolymer (SBS) modifier and bitumen matrix is not only beneficial to further revealing the aging mechanism of SBS modified bitumen (SBSMB) but also can be used to determine the SBS content in SBSMB. Consequently, two separation methods were compared based on solubility differences of SBS, asphaltene and maltene in specific chemical agents, and evaluated by rheological, chemical and morphological analyses. In addition, the application of proposed separation method to SBSMB aging research and SBS content determination was also conducted. The results show that the separation method that first separates asphaltene from SBSMB, and then separates SBS and maltene in residues can successfully separate SBS and bitumen matrix. No new bulk phase is apparent in bitumen after separation processes, and the separation processes of proposed method have few influences on complex modulus of binder while having significant impacts on phase angle of binder. By comparing pure bitumen and separated bitumen matrix from SBSMB, it can be found that the aging susceptibility of bitumen matrix in SBSMB is lower than that of pure bitumen. Moreover, the content of SBS in SBSMB can also be accurately determined by the proposed separation method, which can contribute to quality control of SBSMB products.

ACS Style

Xue Yang; Henglong Zhang; Zihao Chen; Caijun Shi. An improved method for separating styrene-butadiene-styrene triblock copolymer (SBS) and bitumen matrix from SBS modified bitumen. Fuel 2020, 286, 119314 .

AMA Style

Xue Yang, Henglong Zhang, Zihao Chen, Caijun Shi. An improved method for separating styrene-butadiene-styrene triblock copolymer (SBS) and bitumen matrix from SBS modified bitumen. Fuel. 2020; 286 ():119314.

Chicago/Turabian Style

Xue Yang; Henglong Zhang; Zihao Chen; Caijun Shi. 2020. "An improved method for separating styrene-butadiene-styrene triblock copolymer (SBS) and bitumen matrix from SBS modified bitumen." Fuel 286, no. : 119314.

Journal article
Published: 15 August 2020 in Journal of Cleaner Production
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Thermochromic asphalt materials, due to their dynamically reversible thermal and optical responses in accordance with ambient temperature, have the significant potential in prolonging the lifespan of pavement and improving the urban climatic environment. However, the traditional hot-mix asphalt mixture preparation method with high-temperature conditions can cause damage to durability of thermochromic microcapsules contained in asphalt matrix and hence compromise the temperature regulation functionality of thermochromic asphalt materials. Therefore, the effects of reduced aging temperature by warm-mix asphalt (WMA) technology on properties of short-term aged thermochromic asphalt binder were investigated in this research in terms of rheological property, fluorescent morphology, chemical structure, optical reflectance and temperature regulation effectiveness. In addition, environmental impacts of thermochromic asphalt mixture with warm-mix technology were also discussed. The results indicate that the mixing and compaction temperatures of thermochromic asphalt mixture can be reduced by 16 ºC due to WMA technology. The reduced aging temperature by Sasobit can more efficiently maintain the morphology integrity of thermochromic microcapsules, mitigate the outflow of functional core materials and thus improve the optical reflectance of short-term aged thermochromic asphalt binder. When exposed to outdoor solar radiation in hot summer, the asphalt mixture prepared by thermochromic asphalt can achieve a 3 ºC decrease in pavement temperature compared with pure asphalt mixture. In addition, the thermochromic asphalt mixture prepared by WMA technology can further reduce the pavement temperature by 2 ºC when compared with traditional hot-mix thermochromic asphalt mixture. The reduced pavement surface temperature in hot summer can significantly reduce the amount of convection and irradiation heat from pavement to urban atmosphere, which is of great significance to the improvement of urban microclimate and the sustainable development of city.

ACS Style

Zihao Chen; Henglong Zhang; Haihui Duan; Caijun Shi. Improvement of thermal and optical responses of short-term aged thermochromic asphalt binder by warm-mix asphalt technology. Journal of Cleaner Production 2020, 279, 123675 .

AMA Style

Zihao Chen, Henglong Zhang, Haihui Duan, Caijun Shi. Improvement of thermal and optical responses of short-term aged thermochromic asphalt binder by warm-mix asphalt technology. Journal of Cleaner Production. 2020; 279 ():123675.

Chicago/Turabian Style

Zihao Chen; Henglong Zhang; Haihui Duan; Caijun Shi. 2020. "Improvement of thermal and optical responses of short-term aged thermochromic asphalt binder by warm-mix asphalt technology." Journal of Cleaner Production 279, no. : 123675.

Journal article
Published: 23 June 2020 in Construction and Building Materials
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The time-temperature equivalency theory is an important component in asphalt rheology and has been extensively applied in asphalt rheological characterization. The presence of phase angle plateau region shown by styrene–butadiene–styrene (SBS) modified asphalt binder are tightly related with time-temperature conditions, which can be utilized to develop a new potential method for determining time-temperature superposition relationship of SBS modified asphalt (SBSMA). In this paper, the relationship between SBS modifier dosage and its formed morphology structure in asphalt matrix was revealed by fluorescence microscope test. Then, the characteristics and the cause of rheological behaviors for SBSMA with different SBS dosages were described and analyzed, respectively. Further, in terms of different SBSMA binders, the specific ways to determine the time-temperature superposition relationship based on their respective special rheological phenomena were put forward and validated. The results indicate that the structures formed by SBS in asphalt matrix transform from dispersed phase to continuous phase as the SBS dosage increases. SBSMA binders with more than 2% dosage of SBS can all show plateau regions concerning phase angle, while the type of plateau region is varying for different SBS dosages. For SBSMA containing 4% dosage of SBS, the time-temperature conditions that correspond to the end point of every “concave” plateau region are equivalent. For SBSMA containing 6% and 8% dosage of SBS, time-temperature conditions that correspond to the middle point of “convex” plateau region are equivalent.

ACS Style

Zihao Chen; Henglong Zhang; Haihui Duan; Chaofan Wu. Determination of time-temperature superposition relationship of SBS modified asphalt based on special rheological phenomenon caused by SBS-formed structure in asphalt matrix. Construction and Building Materials 2020, 260, 119835 .

AMA Style

Zihao Chen, Henglong Zhang, Haihui Duan, Chaofan Wu. Determination of time-temperature superposition relationship of SBS modified asphalt based on special rheological phenomenon caused by SBS-formed structure in asphalt matrix. Construction and Building Materials. 2020; 260 ():119835.

Chicago/Turabian Style

Zihao Chen; Henglong Zhang; Haihui Duan; Chaofan Wu. 2020. "Determination of time-temperature superposition relationship of SBS modified asphalt based on special rheological phenomenon caused by SBS-formed structure in asphalt matrix." Construction and Building Materials 260, no. : 119835.

Journal article
Published: 27 February 2020 in Construction and Building Materials
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During aging process of styrene–butadienestyrene copolymer (SBS) modified asphalt (SBSMA), hardening of asphalt matrix combined with degradation of SBS modifier simultaneously occurs. A novel catalytic-reactive rejuvenator containing epoxidized soybean oil (ESO) and triphenyl phosphine (TPP) was applied to repair damaged network structure of SBS. In this study, the effects of different blending time and different content of catalytic-reactive rejuvenator on the pressure aging vessel (PAV) aged SBSMA were investigated. The physical and rheological characteristics of unaged SBSMA, aged SBSMA and rejuvenated SBSMA were investigated, and chemical structure of binders were analyzed by Fourier transform infrared spectroscopy (FTIR) to assess the rejuvenation effect. The results illustrate that based on physical properties and the data reflected by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) parameters, 30 min blending is the optimal preparation condition compared with other blending time (15 min, 1 h and 2 h). With the addition of catalyst and increase of its content, the low-temperature flexibility performance of asphalt is improved according to the ductility and BBR tests, and the softening points and the viscoelastic properties obtained in DSR test are improved first and then decline gradually as a result of the multiple effects of catalyst on repairing SBS structure and softening binder. Based on the results of FTIR test, the increasing of –OH peak and the generating of C–O–C peak indicate that the epoxy group of ESO can be opened by catalyst and then polymerizes with aged SBS chains.

ACS Style

Chuanwen Wei; Henglong Zhang; Haihui Duan. Effect of catalytic-reactive rejuvenator on structure and properties of aged SBS modified asphalt binders. Construction and Building Materials 2020, 246, 118531 .

AMA Style

Chuanwen Wei, Henglong Zhang, Haihui Duan. Effect of catalytic-reactive rejuvenator on structure and properties of aged SBS modified asphalt binders. Construction and Building Materials. 2020; 246 ():118531.

Chicago/Turabian Style

Chuanwen Wei; Henglong Zhang; Haihui Duan. 2020. "Effect of catalytic-reactive rejuvenator on structure and properties of aged SBS modified asphalt binders." Construction and Building Materials 246, no. : 118531.

Journal article
Published: 25 February 2020 in Construction and Building Materials
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The phenomenon of ultraviolet (UV) radiation aging gradient in asphalt binder is existent but usually neglected in most of UV radiation aging simulations and real asphalt pavement. Therefore, it is necessary to investigate the developing velocity and causing mechanism of UV aging gradient in asphalt binder. In this paper, the 3 mm-thickness asphalt films that suffered different UV radiation aging periods were divided into average three layers by peeling procedures. Then, rheological properties, molecular sizes distributions, chemical functional groups contents and fluorescence tests were conducted on different asphalt layers. The results indicate that by rheological indexes, the effect of 6-day UV aging is almost negligible, but the UV aging depth can exceed 1 mm after 9-day UV aging period and further exceed 2 mm after 15-day UV aging period. In addition, the vertical gradients of molecular sizes and oxidation products contents tend to form in asphalt film as UV aging process proceeds. Moreover, the observation of inorganic fluorescent powders being able to permeate into fresh asphalt film in lower layers by fluorescence microscope objectively demonstrates the “diffusion aging model” ─ UV aged asphalt molecules diffuse downwards into fresh asphalt film in lower layer.

ACS Style

Zihao Chen; Henglong Zhang; Haihui Duan. Investigation of ultraviolet radiation aging gradient in asphalt binder. Construction and Building Materials 2020, 246, 118501 .

AMA Style

Zihao Chen, Henglong Zhang, Haihui Duan. Investigation of ultraviolet radiation aging gradient in asphalt binder. Construction and Building Materials. 2020; 246 ():118501.

Chicago/Turabian Style

Zihao Chen; Henglong Zhang; Haihui Duan. 2020. "Investigation of ultraviolet radiation aging gradient in asphalt binder." Construction and Building Materials 246, no. : 118501.

Journal article
Published: 04 February 2020 in Construction and Building Materials
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Multi-scale nanocomposites composed of inorganic nanoparticle (nano-silica, nano-titanium or nano-zinc oxide) combined with organic expanded vermiculite can combine the advantages of different dimensional nanomaterials. However, few researchers studied the effect of multi-scale nanocomposites on performance of asphalt mixtures. Therefore, the effect of multi-scale nanocomposites on asphalt binder and its mixture was evaluated simultaneously by laboratory tests to find the multi-scale nanocomposites modified asphalt mixture with the best road performance. The results show multi-scale nanocomposites can improve the low-temperature and anti-aging performance of both asphalt binder and its mixture distinctly, whereas the effect on the high-temperature performance and resistance to water damage for different modifiers was quite different. Besides, the indirect tensile fatigue test verifies the fatigue life of mixture can be extended by introducing multi-scale nanocomposites. But the conclusion of fatigue cracking parameter shows inconsistent with that of indirect tensile fatigue test. Moreover, the optimal combination is 1% organic expanded vermiculite + 3% nano-zinc oxide.

ACS Style

Junzhuo Wang; Henglong Zhang; Chongzheng Zhu. Effect of multi-scale nanocomposites on performance of asphalt binder and mixture. Construction and Building Materials 2020, 243, 118307 .

AMA Style

Junzhuo Wang, Henglong Zhang, Chongzheng Zhu. Effect of multi-scale nanocomposites on performance of asphalt binder and mixture. Construction and Building Materials. 2020; 243 ():118307.

Chicago/Turabian Style

Junzhuo Wang; Henglong Zhang; Chongzheng Zhu. 2020. "Effect of multi-scale nanocomposites on performance of asphalt binder and mixture." Construction and Building Materials 243, no. : 118307.

Journal article
Published: 24 January 2019 in Journal of Cleaner Production
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The influence of different gradations on the final and long-term performance of cold recycled mixture with asphalt emulsion (CRME) was investigated. The weight ratio of recycled asphalt pavement (RAP) to virgin aggregate and mineral powder remained 4:1 unchanged, three gradations were selected in a modified grading range which was determined based on the engineering practices of Hunan province and the Chinese specification for cold recycling (JTG F41-2008). The tested performance included mechanical property, moisture susceptibility, high-temperature stability, low-temperature cracking resistance and long-term performance. The long-term performance was simulated using a laboratory accelerated aging test. The results show that CRMEs with the selected three gradations have good above-mentioned performance, manifesting that the modified grading range for guiding the CRME engineering practices is feasible to some extent. As the aging time goes on, the indirect tensile strength (ITS) and freeze-thaw ITS ratio of all CRMEs firstly increase quickly and then increase slowly or even decrease, and the aging of asphalt in CRME becomes more and more serious. Compared with three gradations, the CRME with finer gradation has the better final and long-term performance. Moreover, after long term service, the effect of gradation on mechanical property of CRME becomes more significant.

ACS Style

Chongzheng Zhu; Henglong Zhang; Hao Guo; Chaofan Wu; Chuanwen Wei. Effect of gradations on the final and long-term performance of asphalt emulsion cold recycled mixture. Journal of Cleaner Production 2019, 217, 95 -104.

AMA Style

Chongzheng Zhu, Henglong Zhang, Hao Guo, Chaofan Wu, Chuanwen Wei. Effect of gradations on the final and long-term performance of asphalt emulsion cold recycled mixture. Journal of Cleaner Production. 2019; 217 ():95-104.

Chicago/Turabian Style

Chongzheng Zhu; Henglong Zhang; Hao Guo; Chaofan Wu; Chuanwen Wei. 2019. "Effect of gradations on the final and long-term performance of asphalt emulsion cold recycled mixture." Journal of Cleaner Production 217, no. : 95-104.

Journal article
Published: 14 January 2019 in Journal of Cleaner Production
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This work investigated the long-term performance and microstructure of asphalt emulsion cold recycled mixture (CRME) with different gradations. Three gradations were selected by varying the passing rate of 4.75 mm critical sieve. CRME samples were firstly treated by an accelerated aging test, and the aging conditions were aging temperatures of 60 °C and 75 °C and aging times of 0 day, 5 days and 10 days. Then the indirect tensile strength (ITS) test, freeze-thaw ITS test and low-temperature ITS test were conducted. The results show that, among the selected three gradations, the CRME with finer gradation has the higher optimum water content and optimum asphalt emulsion content and the denser structure, which in turn leads to the better mechanical property, moisture stability and low-temperature cracking resistance after different aging conditions. Moreover, after long-term aging, the effect of gradation on mechanical property of CRME becomes more and more significant. As the aging time increases, the ITS and freeze-thaw ITS ratio of all CRMEs firstly increase rapidly and then increase slowly or even decrease, and the low-temperature cracking resistance gradually worsens. Compared with 75 °C aging temperature, the CRME under 60 °C aging temperature has the better moisture stability and low-temperature cracking resistance, and the aging effect of 75 °C aging temperature on asphalt binder in CRME is more serious than that of 60 °C aging temperature. Environmental scanning electron microscopy results indicate that, after 10 days aging at 60 °C or 5 days aging at 75 °C, the CRME can form a continuous and close-grained microstructure composed by cement hydration products and asphalt binders.

ACS Style

Chongzheng Zhu; Henglong Zhang; Likui Huang; Chuanwen Wei. Long-term performance and microstructure of asphalt emulsion cold recycled mixture with different gradations. Journal of Cleaner Production 2019, 215, 944 -951.

AMA Style

Chongzheng Zhu, Henglong Zhang, Likui Huang, Chuanwen Wei. Long-term performance and microstructure of asphalt emulsion cold recycled mixture with different gradations. Journal of Cleaner Production. 2019; 215 ():944-951.

Chicago/Turabian Style

Chongzheng Zhu; Henglong Zhang; Likui Huang; Chuanwen Wei. 2019. "Long-term performance and microstructure of asphalt emulsion cold recycled mixture with different gradations." Journal of Cleaner Production 215, no. : 944-951.

Journal article
Published: 22 November 2018 in Solar Energy Materials and Solar Cells
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Thermochromic asphalt binder is an innovative and promising road material in adjusting surface temperature of pavement. Instead, durability of this material under natural environment remains to be unknown. In this paper, weathering aging effects on rheological and chemical evolutions of thermochromic asphalt binder were evaluated by complex modulus (G*) master curve, crossover frequency (ωc), non-recoverable creep compliance (Jnr), zero shear viscosity (ZSV), DSR Function value (DSRFn) and carbonyl and sulfoxide indexes. The results indicated that unlike blank sample, rheological indexes of thermochromic asphalt binder were not always increasing or decreasing with growth of weathering aging time, but there was a turning point during the weathering aging. Furthermore, the effects of weathering aging on rheological properties of thermochromic asphalt binder were much less than blank sample. Growth rates and amplitudes of carbonyl and sulfoxide indexes of thermochromic asphalt binder were also much lower than those of blank sample, which illustrates superior weathering aging resistance of thermochromic asphalt binder. In addition, weathering aging behaviors of thermochromic asphalt binder were dependent on combined effects of asphalt matrix and thermochromic powder.

ACS Style

Zihao Chen; Henglong Zhang; Caijun Shi; Chuanwen Wei. Rheological performance investigation and sustainability evaluation of asphalt binder with thermochromic powders under solar radiation. Solar Energy Materials and Solar Cells 2018, 191, 175 -182.

AMA Style

Zihao Chen, Henglong Zhang, Caijun Shi, Chuanwen Wei. Rheological performance investigation and sustainability evaluation of asphalt binder with thermochromic powders under solar radiation. Solar Energy Materials and Solar Cells. 2018; 191 ():175-182.

Chicago/Turabian Style

Zihao Chen; Henglong Zhang; Caijun Shi; Chuanwen Wei. 2018. "Rheological performance investigation and sustainability evaluation of asphalt binder with thermochromic powders under solar radiation." Solar Energy Materials and Solar Cells 191, no. : 175-182.

Journal article
Published: 10 November 2018 in Construction and Building Materials
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Effect of three liquid anti-stripping agents (ASAs) (M5000, M1 and LOF-6500) on the rheological properties of crumb rubber modified asphalt (CRMA) was investigated. ASAs with three dosages (0.25%, 0.50%, and 0.75%) were interfused in CRMA using melt blending method. All binders were aged employing rolling thin film oven (RTFO) and pressure aging vessel (PAV). Fourier transform infrared spectroscopy (FTIR) was employed to characterize chemical functional groups of ASAs and CRMA. The high temperature rheological properties were evaluated by rotational viscosity, G*, δ, G*/sin δ, failure temperature, Jnr and R, while the low temperature rheological properties were assessed by S and m-value. FTIR result indicates that the chemical reaction between amine in ASA and anhydride in CRMA can happen, and usually form organogels which have exceptional thermal and mechanical stability compared with the amine substances and anhydrides. Rheological tests results show that, with adding various ASAs, the rotational viscosity, G*, G*/sin δ, failure temperature, R and S are enhanced, while the δ and m-value are reduced. It suggests that ASAs improve the high temperature stability of CRMA whereas weaken the low temperature performance of CRMA. Amplitude sweep test results suggest that adding various ASAs does not change the linear viscoelasticity of CRMA before aging when the shear strain range is from 0.01 to 0.1. However, after RTFO, adding M1 and LOF-6500 (aside from 0.75% dosage) greatly reduces the linear viscoelastic range of CRMA. Performance grade (PG) analysis illustrates that M5000 and M1 (except for 0.50% dosage) have no influence on the PG of CRMA, while LOF-6500 decreases one low temperature grade of CRMA.

ACS Style

Juncheng Tang; Chongzheng Zhu; Henglong Zhang; Guoqing Xu; Feipeng Xiao; Serji Amirkhanian. Effect of liquid ASAs on the rheological properties of crumb rubber modified asphalt. Construction and Building Materials 2018, 194, 238 -246.

AMA Style

Juncheng Tang, Chongzheng Zhu, Henglong Zhang, Guoqing Xu, Feipeng Xiao, Serji Amirkhanian. Effect of liquid ASAs on the rheological properties of crumb rubber modified asphalt. Construction and Building Materials. 2018; 194 ():238-246.

Chicago/Turabian Style

Juncheng Tang; Chongzheng Zhu; Henglong Zhang; Guoqing Xu; Feipeng Xiao; Serji Amirkhanian. 2018. "Effect of liquid ASAs on the rheological properties of crumb rubber modified asphalt." Construction and Building Materials 194, no. : 238-246.

Articles
Published: 05 November 2018 in Petroleum Science and Technology
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The effects of different types (red, black and blue color) and content (2% and 4%) of thermochromic powders on aging properties of styrene-butadiene-styrene copolymer (SBS) modified asphalt were investigated. Physical properties of the binders (ductility, penetration, viscosity and softening point) were tested before and after thermal-oxidative and ultraviolet radiation aging. The results showed thermochromic powders improved the deformability and weakened the high-temperature performance of SBS modified asphalt to some extent. Thermochromic powders could obviously improve the anti-aging properties of SBS modified asphalt. In addition, SBS modified asphalt with 2% thermochromic materials showed the best aging resistance under all aging modes.

ACS Style

Lu Li; Henglong Zhang; Zihao Chen. Effect of thermochromic materials on physical and aging properties of SBS modified asphalt. Petroleum Science and Technology 2018, 36, 2119 -2124.

AMA Style

Lu Li, Henglong Zhang, Zihao Chen. Effect of thermochromic materials on physical and aging properties of SBS modified asphalt. Petroleum Science and Technology. 2018; 36 (24):2119-2124.

Chicago/Turabian Style

Lu Li; Henglong Zhang; Zihao Chen. 2018. "Effect of thermochromic materials on physical and aging properties of SBS modified asphalt." Petroleum Science and Technology 36, no. 24: 2119-2124.

Journal article
Published: 29 October 2018 in Construction and Building Materials
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Styrene-butadiene-styrene copolymer (SBS) modified asphalt is widely utilized in road construction. However, aging effect on SBS modified asphalt is still a serious problem that needs to be resolved. It has been demonstrated that thermochromic materials can-not only adjust the road surface temperature, but also improve the aging resistance of base asphalt. This paper mainly investigated the effects of different content (0, 2, 4, 6, 8%) of red thermochromic powders (RTP) on the thermal oxidizing aging of SBS modified asphalt. Thin film oven test (TFOT), pressure aging vessel test (PAV) and ultraviolet radiation (UV), were used to simulate thermo-oxidative aging and ultraviolet aging of RTP binders, respectively. Physical and rheological properties of RTP binders before and after three aging methods were discussed. The results displayed that the red thermochromic powders had a slight effect on high-temperature stability of SBS modified asphalt, while the low-temperature performance grade of the SBS modified asphalt could be improved with the introduction of RTP. Aging behaviors of RTP asphalt binder could be effectively prevented in comparison with blank sample, indicating its good aging resistance which is in accordance with changes in physical and rheological properties of the binders before and after aging. In addition, 2% and 4% RTP binders showed superior aging resistance than 6% and 8% RTP binders.

ACS Style

Lu Li; Henglong Zhang; Zihao Chen; Chuanwen Wei. Physical and rheological evaluation of aging behaviors of SBS modified asphalt with thermochromic powders. Construction and Building Materials 2018, 193, 135 -141.

AMA Style

Lu Li, Henglong Zhang, Zihao Chen, Chuanwen Wei. Physical and rheological evaluation of aging behaviors of SBS modified asphalt with thermochromic powders. Construction and Building Materials. 2018; 193 ():135-141.

Chicago/Turabian Style

Lu Li; Henglong Zhang; Zihao Chen; Chuanwen Wei. 2018. "Physical and rheological evaluation of aging behaviors of SBS modified asphalt with thermochromic powders." Construction and Building Materials 193, no. : 135-141.

Journal article
Published: 16 October 2018 in Construction and Building Materials
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High viscosity is an important feature of SBS modified asphalt, but it is not always favorable because it need more energy to achieve the same viscosity for mixing and construction. Therefore, there are many attempts to improve rheological properties, and on the other hand maintain excellent high-temperature and low-temperature properties of SBS asphalt. Some researchers found that the polyphosphoric acid (PPA) can change the road performance and rheological properties (such as viscosity) of the modified asphalt effectively. The objective of this study is to investigate the high-temperature rheological properties and short-term aging resistance of SBS and three alternative polymer modified binders with/without PPA under Rolling Thin-Film Oven (RTFO) aging process. The rheological properties of these modified binders were tested by DSR and BBR under RTFO short-term aging. The test results indicated that some physical properties such as failure temperature, complex modulus were changed while SBS was replaced partially by PPA, and some properties such as zero shear viscosity, relaxation stress were not influenced regardless of RTFO short-term aging. Therefore it shows that PPA could improve the short-term aging resistance of modified binders.

ACS Style

XiaoMing Liu; Tingyu Li; Henglong Zhang. Short-term aging resistance investigations of polymers and polyphosphoric acid modified asphalt binders under RTFOT aging process. Construction and Building Materials 2018, 191, 787 -794.

AMA Style

XiaoMing Liu, Tingyu Li, Henglong Zhang. Short-term aging resistance investigations of polymers and polyphosphoric acid modified asphalt binders under RTFOT aging process. Construction and Building Materials. 2018; 191 ():787-794.

Chicago/Turabian Style

XiaoMing Liu; Tingyu Li; Henglong Zhang. 2018. "Short-term aging resistance investigations of polymers and polyphosphoric acid modified asphalt binders under RTFOT aging process." Construction and Building Materials 191, no. : 787-794.

Journal article
Published: 01 June 2018 in Fuel
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The performance of asphalt pavement is seriously affected by aging of asphalt binder, so indices are expected which can not only evaluate aging resistance of asphalt binder but also indicate asphalt mixture performance. The objective of this paper was just to investigate effects of different rheological indices which present tighter and clearer correlation with asphalt mixture performance in evaluating asphalt binder aging behaviors, these indices including complex modulus (G∗) and phase angle (δ) master curves, rutting factor (G∗/sinδ), zero shear viscosity (ZSV), non-recoverable compliance (Jnr), fatigue factor (G∗·sinδ) and DSR function (DSRFn). Thin film oven test (TFOT), pressure aging vessel (PAV) test and ultraviolet (UV) irradiation were applied to simulate short-term, long-term thermal oxidation and photo oxidation aging, respectively. Frequency sweep tests and multiple stress creep recovery (MSCR) tests were conducted on three asphalt binders (60/80 pen grade base asphalt, styrene–butadiene-styrenecopolymer (SBS) modified asphalt and styrene butadiene rubber (SBR) modified asphalt) at different aging conditions. Meanwhile, aging sensitivities shown by different rheological indices were compared. The relationships between rheological indices were also discussed. The results showed that the ranking of aging resistances among asphalt binders evaluated by different rheological indices were nearly consistent and SBS modified asphalt exhibited the best aging resistance to three aging methods. Jnr and δ tended to decrease with the growth of aging severity, whereas other rheological indices were just contrary to this trend. Moreover, DSRFn proved to be the most sensitive index to aging. Based on correlation analyses, three groups of indices exhibited a strong correlation to each other, namely DSRFn versus G∗/sinδ, Jnr (0.1 kPa) versus Jnr (3.2 kPa) and Jnr (0.1 kPa) versus ZSV.

ACS Style

Henglong Zhang; Zihao Chen; Guoqing Xu; Caijun Shi. Evaluation of aging behaviors of asphalt binders through different rheological indices. Fuel 2018, 221, 78 -88.

AMA Style

Henglong Zhang, Zihao Chen, Guoqing Xu, Caijun Shi. Evaluation of aging behaviors of asphalt binders through different rheological indices. Fuel. 2018; 221 ():78-88.

Chicago/Turabian Style

Henglong Zhang; Zihao Chen; Guoqing Xu; Caijun Shi. 2018. "Evaluation of aging behaviors of asphalt binders through different rheological indices." Fuel 221, no. : 78-88.

Journal article
Published: 01 April 2018 in Construction and Building Materials
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Multi-dimensional nanomaterials consisting of nano-zinc oxide (nano-ZnO) and organic expanded vermiculite (OEVMT) were utilized to improve anti-aging performance of different types of bitumen. The chemical functional groups of different bitumens with or without multi-dimensional nanomaterials were characterized by Fourier transform infrared spectroscopy (FTIR). The influence of multi-dimensional nanomaterials on aging performances of different bitumens was evaluated using FTIR, viscosity and dynamic shear rheological tests. All binders were aged by thin film oven test (TFOT), pressure aging vessel (PAV) and ultraviolet radiation (UV) aging. Results show that there are some differences in chemical functional group among 60/80, 80/100 and 100/120 penetration grade bitumens according to FTIR analysis. Additionally, with the interfusion of multi-dimensional nanomaterials, the deterioration in physical and rheological properties and the carbonyl formation in bitumen are retarded effectively, whether during thermal-oxidative aging or during photo-oxidative aging, indicating the good aging resistance of modified bitumens. However, for the rank-ordering of improvement magnitudes in aging resistance of different bitumens, FTIR and viscosity test show different evaluation results. The improvements of multi-dimensional nanomaterials on aging resistance of the binders depend on the nature of the base bitumen.

ACS Style

Chongzheng Zhu; Henglong Zhang; Guoqing Xu; Chaofan Wu. Investigation of the aging behaviors of multi-dimensional nanomaterials modified different bitumens by Fourier transform infrared spectroscopy. Construction and Building Materials 2018, 167, 536 -542.

AMA Style

Chongzheng Zhu, Henglong Zhang, Guoqing Xu, Chaofan Wu. Investigation of the aging behaviors of multi-dimensional nanomaterials modified different bitumens by Fourier transform infrared spectroscopy. Construction and Building Materials. 2018; 167 ():536-542.

Chicago/Turabian Style

Chongzheng Zhu; Henglong Zhang; Guoqing Xu; Chaofan Wu. 2018. "Investigation of the aging behaviors of multi-dimensional nanomaterials modified different bitumens by Fourier transform infrared spectroscopy." Construction and Building Materials 167, no. : 536-542.

Journal article
Published: 01 March 2018 in Construction and Building Materials
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Effects of different anti-stripping agents (ASAs) (M5000, M1 and LOF-6500) with various dosages (0.25%, 0.50% and 0.75% by weight of asphalt binder) on the rheological properties of asphalt binder before and after rolling thin film oven test (RTFO) at high temperature were investigated. The tested rheological properties included rotational viscosity, complex modulus (G∗), phase angle (δ), rutting resistance factor (G∗/sinδ), failure temperature, non-recoverable creep compliance (Jnr) and amplitude sweep. The results indicated that the rheological properties such as viscosity, G∗, δ, G∗/sinδ and failure temperature of ASA modified asphalt binders before aging depended on the ASA types and its dosages. After RTFO, all ASA modified asphalt binders showed the lower high temperature stability compared with blank sample, however, the high temperature performance grade maintained 64 °C unchanged. Besides, the Jnr susceptibility for stress level was weakened evidently by adding ASAs. As a result of the amplitude sweep test, compared with blank sample, all ASA modified asphalt binders after RTFO had the higher δ and G∗ values. Additionally, the introduction of ASAs could effectively improve the ability of asphalt binder to resist RTFO. Moreover, compared with M5000 and LOF-6500, the improvement degree of M1 was more apparent.

ACS Style

Chongzheng Zhu; Guoqing Xu; Henglong Zhang; Feipeng Xiao; Serji Amirkhanian; Chaofan Wu. Influence of different anti-stripping agents on the rheological properties of asphalt binder at high temperature. Construction and Building Materials 2018, 164, 317 -325.

AMA Style

Chongzheng Zhu, Guoqing Xu, Henglong Zhang, Feipeng Xiao, Serji Amirkhanian, Chaofan Wu. Influence of different anti-stripping agents on the rheological properties of asphalt binder at high temperature. Construction and Building Materials. 2018; 164 ():317-325.

Chicago/Turabian Style

Chongzheng Zhu; Guoqing Xu; Henglong Zhang; Feipeng Xiao; Serji Amirkhanian; Chaofan Wu. 2018. "Influence of different anti-stripping agents on the rheological properties of asphalt binder at high temperature." Construction and Building Materials 164, no. : 317-325.