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Aging is responsible for the irreversible asphalt-binder stiffening and brittleness. However, various rejuvenators can recycle the aged asphalt-binder. In this study, molecular models of rejuvenators for aged asphalt-binders were constructed using molecular dynamic (MD) simulations. The diffusion coefficients of the rejuvenator, aged asphalt-binder, and four components of the aged asphalt-binder were calculated. The solubility parameters, storage stability, and morphology of rejuvenated aged asphalt-binder were analyzed using MD, softening point tests, and fluorescence microscope, respectively. The results showed that the rejuvenator exhibited excellent regeneration performance and a high diffusion coefficient in the aged asphalt-binder, significantly improving the diffusion of the aged asphalt-binder, especially the diffusion of the saturated and aromatic components in the aged asphalt-binder. The blended mixture of the rejuvenator and the aged asphalt-binder had good storage stability with less than 1.0 °C softening point difference after 48 h. The micro-morphology results showed that the rejuvenator could be evenly distributed in the aged asphalt-binder and form the cross-linking network structures blend with good consistency and compatibility. Overall, this novel organic rejuvenator (namely Soybean-oil) exhibited promising potential for rejuvenating aged asphalt-binders, especially the long-term and extremely aged asphalt-binders.
Xiaorui Zhang; Yunfeng Ning; Xinxing Zhou; Xinquan Xu; Xiaobing Chen. Quantifying the rejuvenation effects of soybean-oil on aged asphalt-binder using molecular dynamics simulations. Journal of Cleaner Production 2021, 317, 128375 .
AMA StyleXiaorui Zhang, Yunfeng Ning, Xinxing Zhou, Xinquan Xu, Xiaobing Chen. Quantifying the rejuvenation effects of soybean-oil on aged asphalt-binder using molecular dynamics simulations. Journal of Cleaner Production. 2021; 317 ():128375.
Chicago/Turabian StyleXiaorui Zhang; Yunfeng Ning; Xinxing Zhou; Xinquan Xu; Xiaobing Chen. 2021. "Quantifying the rejuvenation effects of soybean-oil on aged asphalt-binder using molecular dynamics simulations." Journal of Cleaner Production 317, no. : 128375.
Due to their superior characteristic properties, multi-layered carbon nanotubes (MCNTs) make ideal candidates for use as reinforcing materials, modifiers, or enhancers in asphalt-binders. With this background, this study was conducted to improve the mechanical properties of styrene–butadienestyrene (SBS) modified asphalt-binder (denoted as SBSMA) through injection of various MCNTs dosages into the SBSMA matrix. In the study, molecular dynamic simulations were used to model and quantify the elastic properties (i.e., bulk, shear modulus, etc.) of SBSMA as a function of MCNTs content. The mechanical response curves of the MCNTs reinforced SBSMA, denoted as MSBSMA, were evaluated using the atomic force microscope (AFM) device. The MSBSMA’s rheological properties (i.e., complex modulus and phase angle) were measured using the dynamic shear rheometer (DSR) test device. The corresponding results indicated that MCNTs had a profound impact on enhancing both the rheological properties and mechanical response-behavior of MSBSMA. Furthermore, the molecular simulations were found to be satisfactorily comparable to the laboratory experimentation results. Overall, the study findings substantiated that MCNTs can potentially be used to reinforce and enhance SBSMA.
Xiaorui Zhang; Xinxing Zhou; Wei Ji; Fan Zhang; Frédéric Otto. Characterizing the mechanical properties of Multi-Layered CNTs reinforced SBS modified Asphalt-Binder. Construction and Building Materials 2021, 296, 123658 .
AMA StyleXiaorui Zhang, Xinxing Zhou, Wei Ji, Fan Zhang, Frédéric Otto. Characterizing the mechanical properties of Multi-Layered CNTs reinforced SBS modified Asphalt-Binder. Construction and Building Materials. 2021; 296 ():123658.
Chicago/Turabian StyleXiaorui Zhang; Xinxing Zhou; Wei Ji; Fan Zhang; Frédéric Otto. 2021. "Characterizing the mechanical properties of Multi-Layered CNTs reinforced SBS modified Asphalt-Binder." Construction and Building Materials 296, no. : 123658.
Due to its good piezoelectric and thermoelectrical properties, tourmaline anion powder (TAP) can be used as a potential modifier to improve the piezoelectric, thermoelectric, rheological, and mechanical properties of asphalt binders and asphalt mixtures, respectively. This study was conducted to investigate the functional, piezoelectric, and thermoelectric properties of a TAP-modified asphalt binder (TAPMA) and the corresponding asphalt mixtures. In the study, the TAPMA’s environmental friendliness, such as the volatile organic compound (VOC) adsorption and metal immobilization, were investigated. Compared to TAP at 3.95 pC/N, the piezoelectric constant of TAPMA was found to be 3.42 pC/N. In general, the results indicated that TAP could potentially improve the functional properties of asphalt binders and asphalt mixtures, including the piezoelectric and thermoelectrical properties. With respect to environmental enhancement, the asphalt binder VOC emission reduced to 50% after TAP addition. In terms of metal immobilization, the heavy metals Fe and Ti exhibited the best stability followed by the alkali metals Li, K and Na, and lastly, Ca and Mg, respectively. Nonetheless, the emission concentrations of all the metals were below the regulatory threshold. Furthermore, the study findings also indicated that TAPMA can potentially adsorb the tail gas emissions of vehicles and heavy metals.
Xiaorui Zhang; Xinxing Zhou; Xinquan Xu; Fan Zhang; Leilei Chen. Enhancing the Functional and Environmental Properties of Asphalt Binders and Asphalt Mixtures Using Tourmaline Anion Powder Modification. Coatings 2021, 11, 550 .
AMA StyleXiaorui Zhang, Xinxing Zhou, Xinquan Xu, Fan Zhang, Leilei Chen. Enhancing the Functional and Environmental Properties of Asphalt Binders and Asphalt Mixtures Using Tourmaline Anion Powder Modification. Coatings. 2021; 11 (5):550.
Chicago/Turabian StyleXiaorui Zhang; Xinxing Zhou; Xinquan Xu; Fan Zhang; Leilei Chen. 2021. "Enhancing the Functional and Environmental Properties of Asphalt Binders and Asphalt Mixtures Using Tourmaline Anion Powder Modification." Coatings 11, no. 5: 550.
Since asphalt mortar is highly heterogeneous and occurs as an interfacial bonding material between the asphalt-binder and aggregate, it is very important to have a detailed and adequate understanding of its mechanical properties at a multi-scale (micro and macro) level analysis. In this study, the fundamental properties of the asphalt mortar were evaluated and quantified using molecular dynamic simulations. The tensile strength, stress-separation responses, and adhesive-bonding strength were numerically measured and characterised from a micro perspective. Other mechanical properties such as the complex modulus, low-temperature stiffness modulus, hardness, and elastic modulus were also experimentally measured to verify the dynamic simulations and modelling results. In comparison to the macro experimental test results, it was found that the micro-simulated results were superior in terms of characterising the mechanical properties of the asphalt mortar. Whilst the tensile strength, adhesive-bond strength, and hardness of the asphalt mortar changed significantly as a function of aging, the stress-separation responses and elastic modulus were hardly affected. Overall, the study findings indicated that multi-scale characterisation of the mechanical properties of asphalt mortar is a potentially promising methodology for quantitatively evaluating and understanding the mechanical properties.
Xiaorui Zhang; Fan Zhang; Xinxing Zhou; Xinquan Xu; Xiaobing Chen. Multi-scale evaluation of the mechanical properties of asphalt mortar under different aging conditions. Molecular Simulation 2021, 1 -12.
AMA StyleXiaorui Zhang, Fan Zhang, Xinxing Zhou, Xinquan Xu, Xiaobing Chen. Multi-scale evaluation of the mechanical properties of asphalt mortar under different aging conditions. Molecular Simulation. 2021; ():1-12.
Chicago/Turabian StyleXiaorui Zhang; Fan Zhang; Xinxing Zhou; Xinquan Xu; Xiaobing Chen. 2021. "Multi-scale evaluation of the mechanical properties of asphalt mortar under different aging conditions." Molecular Simulation , no. : 1-12.
Adoption of renewable energy sources such as biomass has been increasing worldwide. In this study, fast pyrolysis as an acceptable and viable method to get renewable bio-oil and biochar is used. Different temperatures and N2 flow velocities were used in the fast pyrolysis process to evaluate the pyrolysis yield of biochar and bio-oil. The waste wood and pig manure were utilized to prepare biochar and bio-oil. X-ray fluorescence, X-ray diffraction, high-pressure liquid chromatograph, Micro confocal laser Raman spectrometer, Fourier transform infrared spectrometer, and dynamic shear rheometer were used to measure the chemical compositions, structure, and pyrolysis yield of biochar and bio-oil. The obtained results indicate that pyrolysis temperature increases the purity of inorganic oxide in biochar and N2 flow velocity promotes the yield of carbon in biochar. The increase of N2 flow velocity would increase the acid property of bio-oil and damage the products yield of bio-oil. It was also observed that biochar could remarkably alter the fundamental performances of petroleum asphalt including penetration, softening point, ductility, viscosity, and complex modulus. The most important is that the upgraded bio-oil can be used to replace partly or fully the petroleum asphalt which is a promising biomass application.
Xinxing Zhou; Taher Baghaee Moghaddam; Meizhu Chen; Shaopeng Wu; Yuan Zhang; Xiaorui Zhang; Sanjeev Adhikari; Xiao Zhang. Effects of pyrolysis parameters on physicochemical properties of biochar and bio-oil and application in asphalt. Science of The Total Environment 2021, 780, 146448 .
AMA StyleXinxing Zhou, Taher Baghaee Moghaddam, Meizhu Chen, Shaopeng Wu, Yuan Zhang, Xiaorui Zhang, Sanjeev Adhikari, Xiao Zhang. Effects of pyrolysis parameters on physicochemical properties of biochar and bio-oil and application in asphalt. Science of The Total Environment. 2021; 780 ():146448.
Chicago/Turabian StyleXinxing Zhou; Taher Baghaee Moghaddam; Meizhu Chen; Shaopeng Wu; Yuan Zhang; Xiaorui Zhang; Sanjeev Adhikari; Xiao Zhang. 2021. "Effects of pyrolysis parameters on physicochemical properties of biochar and bio-oil and application in asphalt." Science of The Total Environment 780, no. : 146448.
Presence of moisture can weaken the asphalt-aggregate bond and result in aggregate stripping and moisture damage in asphalt mixture. This study investigates how the moisture affects the asphalt-aggregate bond and simulates moisture distribution of nano-scale in asphalt-aggregate interface. Effects of aggregate type (basalt, dolomite and limestone minerals), humidity and hydraulic pressure on moisture diffusion in asphalt-aggregate interface are studied. Diffusion coefficient (D), radial distribution function (RDF), contact angle (CA), free volume (FV) are calculated through molecular dynamic simulations. Polarizability of moisture in the asphalt-aggregate interface was measured using density function theory (DFT). Nano-scale moisture migration model in the asphalt-aggregate interface is built for the first time. The results show that D depends more on the hydraulic pressure than humidity and aggregate type which represents the significance of hydraulic pressure on the moisture diffusion. In addition, the aggregate type has significant effects on RDF, CA and FV. DFT results indicate that polarizability of moisture changes for different types of aggregate and hydraulic pressure values. In the asphalt-water-aggregate interface, the asphalt competitively interacts with moisture and ions from minerals through intermolecular forces.
Xinxing Zhou; Taher Baghaee Moghaddam; Meizhu Chen; Shaopeng Wu; Sanjeev Adhikari; Fusong Wang; Zepeng Fan. Nano-scale analysis of moisture diffusion in asphalt-aggregate interface using molecular simulations. Construction and Building Materials 2021, 285, 122962 .
AMA StyleXinxing Zhou, Taher Baghaee Moghaddam, Meizhu Chen, Shaopeng Wu, Sanjeev Adhikari, Fusong Wang, Zepeng Fan. Nano-scale analysis of moisture diffusion in asphalt-aggregate interface using molecular simulations. Construction and Building Materials. 2021; 285 ():122962.
Chicago/Turabian StyleXinxing Zhou; Taher Baghaee Moghaddam; Meizhu Chen; Shaopeng Wu; Sanjeev Adhikari; Fusong Wang; Zepeng Fan. 2021. "Nano-scale analysis of moisture diffusion in asphalt-aggregate interface using molecular simulations." Construction and Building Materials 285, no. : 122962.
Aging has a detrimental impact on the interfacial interaction and bonding between asphalt-binder and aggregates, which influence ultimately on the performance of asphalt mixtures and pavements. Evaluation of the mechanical properties of the interface between the asphalt-binder and aggregates has thus become a hot research topic, particularly as a function of aging. In this study, the interfacial tensile strength, compressive strength, elastic modulus, and interfacial recovery energy were measured and quantified using molecular dynamic simulation. Whilst the free volume of the asphalt mixtures exhibited sensitivity to aging, the interfacial tensile strength decreased with an increase in the degree of aging. In general, the mechanical properties of the asphalt-binder-aggregate interface were found to be significantly dependent on the aggregate type. Furthermore, the study results indicated that interfacial recovery energy is a key characteristic property for characterizing the interfacial adhesive force within asphalt mixtures. Overall, the study of mechanical properties of the asphalt-binder and aggregate interface, as presented in this paper, contributes to quantifying the adhesive properties and improving the performance of asphalt mixtures.
Xiaorui Zhang; Juntian Wang; Xinxing Zhou; Zhuqiu Zhang; Xiaobing Chen. Mechanical Properties of the Interfacial Bond between Asphalt-Binder and Aggregates under Different Aging Conditions. Materials 2021, 14, 1221 .
AMA StyleXiaorui Zhang, Juntian Wang, Xinxing Zhou, Zhuqiu Zhang, Xiaobing Chen. Mechanical Properties of the Interfacial Bond between Asphalt-Binder and Aggregates under Different Aging Conditions. Materials. 2021; 14 (5):1221.
Chicago/Turabian StyleXiaorui Zhang; Juntian Wang; Xinxing Zhou; Zhuqiu Zhang; Xiaobing Chen. 2021. "Mechanical Properties of the Interfacial Bond between Asphalt-Binder and Aggregates under Different Aging Conditions." Materials 14, no. 5: 1221.
This paper focuses on the life cycle assessment (LCA) of different types of biochar modified bioasphalt (BMBA) by considering greenhouse gas (GHG) emission and environmental pollution factors. Biochar and bio-oil were obtained from two types of biomass (waste wood and pig manure). The application of BMBA would not only improve the efficiency of biomass utilization but also enhance the environmental protection. Analyses were carried out by considering different stages which stem from the combination of material preparation, construction, use, maintenance, and demolition recovery. The GHG (CO2 equivalent) and environmental pollutants (volatile organic compounds equivalent, VOCs) of BMBA were used for life-cycle inventory assessment. The results showed that three critical factors including material preparation and demolition recovery contribute to environmental impact. Bioasphalt species could significantly affect the energy consumption factor and reduce the environmental pollution. As biochar and bio-oil contents increase, GHG emissions decrease accordingly. The results indicated that material preparation had the biggest contribution in energy consumption. The findings highlighted the significance of bioasphalt species and content on VOCs decay pattern in life cycle assessment and global warming potential.
Xinxing Zhou; Taher Baghaee Moghaddam; Meizhu Chen; Shaopeng Wu; Sanjeev Adhikari; Song Xu; Chao Yang. Life Cycle Assessment of Biochar Modified Bioasphalt Derived from Biomass. ACS Sustainable Chemistry & Engineering 2020, 8, 1 .
AMA StyleXinxing Zhou, Taher Baghaee Moghaddam, Meizhu Chen, Shaopeng Wu, Sanjeev Adhikari, Song Xu, Chao Yang. Life Cycle Assessment of Biochar Modified Bioasphalt Derived from Biomass. ACS Sustainable Chemistry & Engineering. 2020; 8 (38):1.
Chicago/Turabian StyleXinxing Zhou; Taher Baghaee Moghaddam; Meizhu Chen; Shaopeng Wu; Sanjeev Adhikari; Song Xu; Chao Yang. 2020. "Life Cycle Assessment of Biochar Modified Bioasphalt Derived from Biomass." ACS Sustainable Chemistry & Engineering 8, no. 38: 1.
Volatile organic compounds (VOCs) emission not only cause the environmental pollution, but also severely threaten human health as they are known to be toxic and carcinogenic. This study investigates the effects of biochar on removing the VOCs emission from asphalt. The biochar was obtained from the pyrolyzed productions of pig manure, waste wood and straw biomasses. Molecular model for the adsorption of the VOCs was developed and used to measure the adsorption energy and heat. The VOCs removal model was built and used to determine the VOCs removal mechanism in the asphalt. The results showed that biochar could remove alkanes, polycyclic aromatic hydrocarbons (PAHs) and sulphide compounds because of its intrinsic carbon negativity and porosity. Furthermore, source of the biochar was an influential factor on the adsorption of the VOCs compounds. Based on the results, waste wood-based biochar had the best adsorption performance which could be related to the amorphous carbon, graphite and its porous structure. Also, it shows that biochar has the great potential to be used as VOCs inhibitors.
Xinxing Zhou; Taher Baghaee Moghaddam; Meizhu Chen; Shaopeng Wu; Sanjeev Adhikari. Biochar removes volatile organic compounds generated from asphalt. Science of The Total Environment 2020, 745, 141096 .
AMA StyleXinxing Zhou, Taher Baghaee Moghaddam, Meizhu Chen, Shaopeng Wu, Sanjeev Adhikari. Biochar removes volatile organic compounds generated from asphalt. Science of The Total Environment. 2020; 745 ():141096.
Chicago/Turabian StyleXinxing Zhou; Taher Baghaee Moghaddam; Meizhu Chen; Shaopeng Wu; Sanjeev Adhikari. 2020. "Biochar removes volatile organic compounds generated from asphalt." Science of The Total Environment 745, no. : 141096.
Bio-asphalt replaced petroleum-asphalt for paving asphalt pavements, which is a technology with a wide range of application prospect. This work is aimed at improving the performance of aged bio-oil modified asphalt (bio-asphalt) for use in road pavement construction. Biochar and bio-oil are renewable resources and use in this research that are pyrolyzed from waste wood. The effects of different aging conditions on biochar-modified bio-asphalt and ordinary bio-asphalt were investigated in terms of their chemical functional groups, molecular formulas, radius distribution functions, rheological parameters, and phase separation. The aging conditions considered in this research are short-term aging, ultraviolet (UV) aging, pressure aging vessel (PAV), and low-temperature hardening. Biochar plays a significant role in the UV aging process. This study found that, with an increase in biochar modification, the alkyl group numbers increased and the sulfoxide and carbonyl numbers decreased during the aging process of bio-asphalt. It also shows that the inclusion of biochar improved the aging resistance of the bio-asphalt, but that biochar modification did not affect the bio-asphalt’s low-temperature hardening performance. Four asphalt components were studied: saturates, asphaltenes, resins, and aromatics (SARA). The effects of biochar on saturates and aromatics were significant, and the biochar was able to adsorb these components. This study also found that, with an increase in UV aging and PAV, the phase separation grows.
Xinxing Zhou; Guangyuan Zhao; Shaopeng Wu; Susan Tighe; Daniel Pickel; Meizhu Chen; Sanjeev Adhikari; Yangming Gao. Effects of biochar on the chemical changes and phase separation of bio-asphalt under different aging conditions. Journal of Cleaner Production 2020, 263, 121532 .
AMA StyleXinxing Zhou, Guangyuan Zhao, Shaopeng Wu, Susan Tighe, Daniel Pickel, Meizhu Chen, Sanjeev Adhikari, Yangming Gao. Effects of biochar on the chemical changes and phase separation of bio-asphalt under different aging conditions. Journal of Cleaner Production. 2020; 263 ():121532.
Chicago/Turabian StyleXinxing Zhou; Guangyuan Zhao; Shaopeng Wu; Susan Tighe; Daniel Pickel; Meizhu Chen; Sanjeev Adhikari; Yangming Gao. 2020. "Effects of biochar on the chemical changes and phase separation of bio-asphalt under different aging conditions." Journal of Cleaner Production 263, no. : 121532.
Xinxing Zhou; Qiong Huang; Song Xu. Multi-scale analysis of moisture diffusion and distribution in different types of asphalt mixtures. International Journal of Pavement Engineering 2020, 1 -10.
AMA StyleXinxing Zhou, Qiong Huang, Song Xu. Multi-scale analysis of moisture diffusion and distribution in different types of asphalt mixtures. International Journal of Pavement Engineering. 2020; ():1-10.
Chicago/Turabian StyleXinxing Zhou; Qiong Huang; Song Xu. 2020. "Multi-scale analysis of moisture diffusion and distribution in different types of asphalt mixtures." International Journal of Pavement Engineering , no. : 1-10.
Quantitative analysis was conducted in this study using a three-dimensional field microscope, scanning electron microscope, energy dispersive spectroscopy, and molecular simulation to investigate the surface and interface adhesive properties of three fine aggregate asphalt mixtures (FAM): basalt, steel slag, and andesite. The roughness of the aggregate and the contact angle of the asphalt on the aggregate surfaces also were analyzed quantitatively. Molecular dynamics simulations were carried out to evaluate the adhesive properties, molecular diffusion, and interfacial failure mechanisms of the basalt-, steel slag-, and andesite-based FAM. The average roughness values of the basalt, steel slag, and andesite were found to be 138.2 µm, 244.0 µm, and 185.2 µm, respectively. The stripping percentages of the basalt, steel slag, and andesite were 11.3%, 3.3%, and 10.8%, respectively. The diffusion coefficients of the resins (3.32 × 10−9 m2/s) and asphaltenes (3.05 × 10−9 m2/s) were higher than the diffusion coefficient of the oils (2.98 × 10−9 m2/s). The results indicate that the surface roughness and adhesive capacity of the aggregate used in this study can be ranked in decreasing order as steel slag, andesite, and basalt. The asphaltenes and resins contributed to the asphalt’s increased adhesion to the aggregate particles. Both adhesive and cohesive failure were found for the basalt-, steel slag-, and andesite-based FAM, but the steel slag FAM exhibited more cohesive failure, whereas the basalt and andesite FAM exhibited more adhesive failure.
Xinxing Zhou; Guangyuan Zhao; Susan Tighe; Meizhu Chen; Shaopeng Wu; Sanjeev Adhikari; Yangming Gao. Quantitative comparison of surface and interface adhesive properties of fine aggregate asphalt mixtures composed of basalt, steel slag, and andesite. Construction and Building Materials 2020, 246, 118507 .
AMA StyleXinxing Zhou, Guangyuan Zhao, Susan Tighe, Meizhu Chen, Shaopeng Wu, Sanjeev Adhikari, Yangming Gao. Quantitative comparison of surface and interface adhesive properties of fine aggregate asphalt mixtures composed of basalt, steel slag, and andesite. Construction and Building Materials. 2020; 246 ():118507.
Chicago/Turabian StyleXinxing Zhou; Guangyuan Zhao; Susan Tighe; Meizhu Chen; Shaopeng Wu; Sanjeev Adhikari; Yangming Gao. 2020. "Quantitative comparison of surface and interface adhesive properties of fine aggregate asphalt mixtures composed of basalt, steel slag, and andesite." Construction and Building Materials 246, no. : 118507.
To improve the oil absorbency of caster oil‐based polyurethane foam, nano‐organic‐montmorillonite (OMMT) was used for the additives. The aim of this study is to evaluate the oil diffusion mechanism and dispersion uniformity of OMMT modified caster oil‐based polyurethane (MPU) using experiments and molecular dynamic simulation. Molecule movement and molecule trajectory of oil was investigated by molecular dynamic simulation and numerical simulation. According to the quantitative analyzing results, the diffusion model was put forward. The average diffusion coefficient of crude oil in 0, 1, 2 wt%, 4, and 6 wt% MPU is 2.4 × 10−4 cm2/s, 2.6 × 10−4 cm2/s, 3.0 × 10−4 cm2/s, 3.2 × 10−4 cm2/s, and 3.3 × 10−4 cm2/s, respectively. It indicated that crude oil appeared gradient in the MPU. The optimal diffusion direction of crude oil is (0, 0, 1) crystal face, and the small particles of crude oil are easy to be adsorbed. The two‐dimensional diffusion trajectory of crude oil is nonlinear. The diffusion model includes the diffusion of crude oil at the interface of oil and polyurethane, surface diffusion and pore diffusion, and pore adsorption. Furthermore, the diffusion model showed that the van der Waals force was the main reason for crude oil diffusion or adsorption. OMMT could improve the ability of oil/water separation of polyurethane.
Xinxing Zhou; Qiong Huang. Quantitative evaluation on oil diffusion mechanisms in nano‐organic‐montmorillonite modified caster oil‐based polyurethane foam for oil/water separation. Polymers for Advanced Technologies 2020, 31, 1231 -1244.
AMA StyleXinxing Zhou, Qiong Huang. Quantitative evaluation on oil diffusion mechanisms in nano‐organic‐montmorillonite modified caster oil‐based polyurethane foam for oil/water separation. Polymers for Advanced Technologies. 2020; 31 (6):1231-1244.
Chicago/Turabian StyleXinxing Zhou; Qiong Huang. 2020. "Quantitative evaluation on oil diffusion mechanisms in nano‐organic‐montmorillonite modified caster oil‐based polyurethane foam for oil/water separation." Polymers for Advanced Technologies 31, no. 6: 1231-1244.
The annual output of coal fly ash and furnace bottom is ca.7.2 billion tons and ca.4.5 billion tons in China, respectively, which affected seriously human health and ecological safety. In order to enhance the mechanical strength and durability of geopolymer and take full use of solid waste, the coal fly ash and furnace bottom slag were added into the light-weight geopolymer. This study explores the micromorphology and microstructure of light-weight geopolymer under the different SiO2/Al2O3 ratio and the maintenance time. Molecular dynamic simulation (MD), numerical simulation, and scanning electronic microscope (SEM) were used to investigate the micromorphology and microstructure of light-weight geopolymer. Numerical simulation was used to study the hydration mechanisms of light-weight geopolymer. The compressive strength of light-weight geopolymer ranged from 15 MPa to 62 MPa with the increase of alkaline activators content. The mechanical proprieties such as Young modulus, bulk modulus, shear modulus of light-weight geopolymer increased 3–5 times when the SiO2/Al2O3 ratio is 3.0. Laboratory results reveal that the SiO2/Al2O3 ratio affects the polymerization by influencing the formation of zeolites microstructure. The maintenance time could affect the micromorphology and hydration reaction of light-weight geopolymer. Simulation results show that coal ash affects the early hydration reaction of light-weight geopolymer, while the furnace bottom slag affect the last hydration reaction. In the late of hydration reaction, the internal layer production expanded out and formed the network structure.
Xinxing Zhou; Junmin Shen. Micromorphology and microstructure of coal fly ash and furnace bottom slag based light-weight geopolymer. Construction and Building Materials 2020, 242, 118168 .
AMA StyleXinxing Zhou, Junmin Shen. Micromorphology and microstructure of coal fly ash and furnace bottom slag based light-weight geopolymer. Construction and Building Materials. 2020; 242 ():118168.
Chicago/Turabian StyleXinxing Zhou; Junmin Shen. 2020. "Micromorphology and microstructure of coal fly ash and furnace bottom slag based light-weight geopolymer." Construction and Building Materials 242, no. : 118168.
The engineering properties of water-rich loess tunnel will decline sharply because of the existence of water, which threats the safety and stability of the tunnel seriously. In order to ensure the safety and stability of the Qiaoyuan tunnel, the life-cycle health monitoring was measured by the vibrating wire sensor and distributed optical fiber. The contact pressure, shotcrete stress, stress of steel arch rib, and strain states of the secondary liner were evaluated. The results of the life-cycle health monitoring demonstrated that the construction procedure, irrigation, and heavy rainfall significantly affected the mechanics morphology of the support structure. In particular, under the influence of irrigation, the shotcrete stress of the left shoulder had risen to 6.21 MPa from 5.30 MPa. Affordable maximum tensile stress of the right shotcrete is 2.15 MPa, which caused the cracking of primary support structure with a crack width of 3 mm to 8 mm. After irrigation and heavy rainfall, the stress of steel arch rib of the left haunch had risen to 135.7 MPa and 298.7 MPa, respectively. In addition, the strain of secondary liner rose to 1498 με from 1278 με continuously at the right sidewall on section YK9 + 685, presenting that the crack was still developing. It indicates that the vibrating wire sensor and the distributed optical fiber were successful in achieving the life-cycle health monitoring of water-rich loess tunnel. This technique has a significant impact on formulating the maintaining measures and reducing the risk of tunnel.
Xiaohui Xue; Yongli Xie; Xinxing Zhou. Study on the Life-Cycle Health Monitoring Technology of Water-Rich Loess Tunnel. Advances in Materials Science and Engineering 2019, 2019, 1 -12.
AMA StyleXiaohui Xue, Yongli Xie, Xinxing Zhou. Study on the Life-Cycle Health Monitoring Technology of Water-Rich Loess Tunnel. Advances in Materials Science and Engineering. 2019; 2019 ():1-12.
Chicago/Turabian StyleXiaohui Xue; Yongli Xie; Xinxing Zhou. 2019. "Study on the Life-Cycle Health Monitoring Technology of Water-Rich Loess Tunnel." Advances in Materials Science and Engineering 2019, no. : 1-12.
Flow-induced crystallization (FIC) in polymers is an important problem that occurs on a very rapid time scale. This study aims to evaluate the flow-induced crystallization of bio-asphalt modified with different contents of biochar under various aging conditions. Small angle X-ray scattering and molecular dynamic simulations were performed to impose extensional deformation and the nucleation process. The rheological properties were measured using the dynamic shear rheometer (DSR) and the morphology of biochar modified bio-asphalt (BMBA) was measured using an optical microscope. The relative scattering intensity during crystallization appeared to peak at four strain rates: 13.2 s−1, 19.6 s−1, 25.4 s−1, and 27.3 s−1. The results showed that the addition of biochar could improve the flow-induced crystallization and enhance the high-temperature properties of bio-asphalt. Moreover, crystallization status of BMBA is lamellar crystals. Ultraviolet and pressure aging vessel aging could remarkably affect the crystallization status of BMBA and promote the formation of crystals.
Xinxing Zhou; Sanjeev Adhikari. Flow-induced crystallization of biochar in bio-asphalt under various aging conditions. Science of The Total Environment 2019, 695, 133943 .
AMA StyleXinxing Zhou, Sanjeev Adhikari. Flow-induced crystallization of biochar in bio-asphalt under various aging conditions. Science of The Total Environment. 2019; 695 ():133943.
Chicago/Turabian StyleXinxing Zhou; Sanjeev Adhikari. 2019. "Flow-induced crystallization of biochar in bio-asphalt under various aging conditions." Science of The Total Environment 695, no. : 133943.
Welan gum modified polyurethane (WMP) with different welan gum concentrations were synthesized at vacuum conditions. The average pore diameter, porosity, pore volume, contact angle, pore morphology, oil adsorption ratio and absorption energy of WMPs were investigated by nitrogen adsorption analysis (NAA), scanning electron microscope (SEM), energy disperse spectroscopy (EDX), and molecular simulation. The results demonstrated that pore structure is highly dependent on the welan gum content. Moreover, the number of dead-end pores in the WMP decreased more compared to inter-connected, passing, and closed pores. Simulation results showed that the adsorption properties of WMP increased with the increasing welan gum content at a certain level. Welan gum could change the pore shape and improve the irregularity degree of WMP. The gel shrinkage also improves in spite of the hydrogen-bonding interactions. The two parameters of Langmuir isotherms are 42.68mg/g and 0.0245L/mg, respectively. The gasoline adsorbability of WMP is smaller than that of diesel. Consequently, welan gum could improve the adsorption heat and the adsorbability of polyurethane.
Xinxing Zhou; Qiong Huang; Song Xu; Zepeng Fan. Pore structure and adsorption properties of welan gum modified polyurethane. Materials Research Express 2019, 6, 095316 .
AMA StyleXinxing Zhou, Qiong Huang, Song Xu, Zepeng Fan. Pore structure and adsorption properties of welan gum modified polyurethane. Materials Research Express. 2019; 6 (9):095316.
Chicago/Turabian StyleXinxing Zhou; Qiong Huang; Song Xu; Zepeng Fan. 2019. "Pore structure and adsorption properties of welan gum modified polyurethane." Materials Research Express 6, no. 9: 095316.
In order to inhibit and remove the thin ice and extend the lifetime of the damaged bridge, the self-healing mechanism and hydrophobic performance of asphalt modified by siloxane and polyurethane (ASP) were studied by dynamic shear rheology (DSR), fluorescence microscope (FM), atomic force microscope (AFM), the fracture-healing-re-fracture test and molecular simulations. The experimental results indicated that the self-healing capability of ASP increased with increasing heating time and temperature. Furthermore, the addition of siloxane could improve the reaction energy barrier and complex modulus, and it is believed that the self-healing is a viscosity driven process, consisting of two parts namely crack closure and properties recovery. Contact angle of ASP increased with the increasing siloxane content and it deduced that the siloxane could improve the hydrophobic performance of ASP and the ASP molecule model could simulate well the self-healing mechanism and hydrophobic performance of ASP.
Xinxing Zhou; Bin Sun; Shaopeng Wu; Xiao Zhang; Quantao Liu; Yue Xiao. Evaluation on Self-healing Mechanism and Hydrophobic Performance of Asphalt Modified by Siloxane and Polyurethane. Journal of Wuhan University of Technology-Mater. Sci. Ed. 2019, 34, 630 -637.
AMA StyleXinxing Zhou, Bin Sun, Shaopeng Wu, Xiao Zhang, Quantao Liu, Yue Xiao. Evaluation on Self-healing Mechanism and Hydrophobic Performance of Asphalt Modified by Siloxane and Polyurethane. Journal of Wuhan University of Technology-Mater. Sci. Ed.. 2019; 34 (3):630-637.
Chicago/Turabian StyleXinxing Zhou; Bin Sun; Shaopeng Wu; Xiao Zhang; Quantao Liu; Yue Xiao. 2019. "Evaluation on Self-healing Mechanism and Hydrophobic Performance of Asphalt Modified by Siloxane and Polyurethane." Journal of Wuhan University of Technology-Mater. Sci. Ed. 34, no. 3: 630-637.
Crack is the most prevalent disease of water-rich loess tunnels, which impacts the tunnel safety and reliability. The study aimed to investigate the multi-index of tunnel lining crack based on extension theory and reliability evaluation. A new evaluation model was built, and the matter-element concept was used to describe the reliability of a water-rich loess tunnel with lining crack. Crack width, crack depth, crack length, crack geometry, and water seepage of the Qiaoyuan tunnel were measured by intelligent crack measuring instrument, 10 m tape, laser scanner, and dosing cup. According to the analytic hierarchy process (AHP), the judgment matrix could be used to describe the relative importance of each index. Combining the maximum eigenvalue with checking consistency, the weight coefficients of 5 factors were calculated. A probabilistic statistic method and comparison of specification are performed to confirm the validity of extension theory in reliability evaluation. The results showed that the extension theory provided a reliability evaluation method of a water-rich loess tunnel with lining crack.
Xiaohui Xue; Jun Zhang; Xinxing Zhou. Reliability Evaluation of Water-Rich Loess Tunnel with Lining Crack Based on Extension Theory. Advances in Civil Engineering 2019, 2019, 1 -10.
AMA StyleXiaohui Xue, Jun Zhang, Xinxing Zhou. Reliability Evaluation of Water-Rich Loess Tunnel with Lining Crack Based on Extension Theory. Advances in Civil Engineering. 2019; 2019 ():1-10.
Chicago/Turabian StyleXiaohui Xue; Jun Zhang; Xinxing Zhou. 2019. "Reliability Evaluation of Water-Rich Loess Tunnel with Lining Crack Based on Extension Theory." Advances in Civil Engineering 2019, no. : 1-10.
Polyurethane (PU) production with the use of soybean oil was greatly appreciated by researchers due to their low cost, easy availability, and nontoxic nature. The thermokinetics and degradation process of soybean oil‐based PU (SPU) were measured by differential scanning calorimetry–thermogravimetry–Fourier transform infrared spectrum. Influence of various factors such as the NCO/OH molar ratio (1.5–2.0) and different heating rates on the thermodynamic properties and thermal stability during the degradation process were studied in detail. Moreover, the thermokinetics mechanism included activation energy, reaction rate, and kinetic parameters of the degradation process were evaluated using “AKTS‐Thermokinetics” software. The reaction rate ranged from 0.0005 to 0.0025 at the first stage (60–150 °C), then changed to values between 0.00025 and 0.0015 at the second stage (250–350 °C) and between 0.00025 and 0.0020 at the third stage (400–550 °C). It was observed that the degradation progress included with three‐ or four‐step degradation profiles. As the soybean oil content or NCO/OH molar ratio increase, the thermal stability of SPU increased. In addition, the activation energy and reaction rate increased with the increased soybean oil contents. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 136, 47357.
Xinxing Zhou. Thermokinetics study of degradation process of soybean-based polyurethane foams. Journal of Polymer Science 2018, 136, 1 .
AMA StyleXinxing Zhou. Thermokinetics study of degradation process of soybean-based polyurethane foams. Journal of Polymer Science. 2018; 136 (16):1.
Chicago/Turabian StyleXinxing Zhou. 2018. "Thermokinetics study of degradation process of soybean-based polyurethane foams." Journal of Polymer Science 136, no. 16: 1.