Asphalt Binder

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Shaopeng Wu - One of the best experts on this subject based on the ideXlab platform.

  • characteristics of bonding behavior between basic oxygen furnace slag and Asphalt Binder
    Construction and Building Materials, 2014
    Co-Authors: Zongwu Chen, Yue Xiao, Juyong Chen, Shaopeng Wu
    Abstract:

    Abstract Basic Oxygen Furnace (BOF) slag is one of the steel slags, which are by-products in steel industry. Currently there is lack of effective ways to reuse it. It has caused various environmental issues such as water pollution, soil pollution and shortage of storage spaces. Therefore, research on using BOF slag as a novel aggregate in Asphalt pavement has benefits both in environment and economics. The bonding behavior between slags and Asphalt Binder is one of the most important properties to ensure a durable BOF slag based Asphalt pavement. In this research, the bonding behavior between BOF slag and Asphalt Binder was studied. X-ray diffraction (XRD) was first conducted to understand the physical and hydration characteristics of BOF slag. Modified boiling water test and self-designed tensile test were than used to quantify the bonding behavior. Moisture resistance of bonding behavior can be also investigated with modified boiling water test. The results of boiling water test indicated that the BOF slag, firmly coved with hydration products, has the potential to protect the Asphalt Binder from being stripped by boiling water. Self-designed tensile test result illustrated that BOF slag had better bonding strength than the values of basalt and granite aggregates.

  • effects of two biomass ashes on Asphalt Binder dynamic shear rheological characteristic analysis
    Construction and Building Materials, 2014
    Co-Authors: Shaopeng Wu, Min Zhou
    Abstract:

    Abstract In this work, two kinds of biomass ashes (BA), rice husk ash (RHA) and wood sawdust ash (WSA) were used to modify Asphalt Binder. Fourier Transform Infrared (FT-IR) Spectroscopy was used to characterize the effects of biomass ashes on chemical properties of Asphalt Binder. Physical properties, such as dynamic rheological behavior, high temperature storage stability and aging properties of the modified Asphalt were investigated. Test results indicated that there is no chemical reaction between Asphalt Binder and BA. The RHA and WSA particle effect during blending with Asphalt Binder under physical agitation dominated the modification. Compared with WSA, RHA showed better effect in improving physical properties of modified Asphalt Binder. The storage stability tests indicated that the Asphalt Binder modified with RHA and WSA is stable when ash content is less than 20%. With the enhancement of the content of RHA and WSA to Asphalt Binder, viscosity, complex modulus and rutting factor ( G * /sin  δ ) of modified Asphalt Binders increased rapidly at high temperatures. As a consequence, the deformation resistance of these modified Binders at high temperatures was especially improved. RHA and WSA can be considered as Asphalt modifiers which were more helpful for the improvement of rutting resistance.

  • effects of aging on the properties of modified Asphalt Binder with flame retardants
    Construction and Building Materials, 2010
    Co-Authors: Peiliang Cong, Shuanfa Chen, Jianying Yu, Shaopeng Wu
    Abstract:

    Abstract Effects of aging on the properties of Asphalt Binders modified by incorporating Styrene–Butadiene–Styrene (SBS) and flame retardants (FR) were studied. Asphalt Binders were artificially aged in the rolling thin film oven (RTFOT) and Pressure Aging Vessel (PAV). The flame retardancy of modified Asphalt Binders were characterized using limited oxygen index (LOI), and the effects of aging on the properties of Asphalt Binders were studied using Brookfield viscometer test and dynamic shear rheometer test. Experimental results indicated that the flame retardancy of Asphalt Binder was increased after aging. But the increasing amount of LOI is low when the modified Asphalt Binder containing more flame retardants. The variation of the LOI, softening point, penetration, ductility and viscosity of Asphalt Binder decreased with flame retardant content increasing, meaning the flame retardants can improve the thermo-oxidative aging resistance of Asphalt Binder. Furthermore, the G * /sin  δ , stiffness and m -value of flame retardant modified Asphalt Binders display smaller changes after two different aging.

  • Comparison on rheological properties of origin and layered nano-montmorillonite modified Asphalt Binder
    2010 International Conference on Mechanic Automation and Control Engineering, 2010
    Co-Authors: Shaopeng Wu
    Abstract:

    Montmorillonite (MMT) is a typical layered silicate. It has been widely used to modify polymers. In recent years, layered silicate has been receiving more attention from researchers in the civil engineering field, especially the organic nano-montmorillonite (OMMT). Flexible pavement plays an important role in structures of the primary highway at present. With the development of road traffic, Asphalt pavement has gained more and more attention. The requirements for modified bitumen are increasing according to the higher load condition and worse serving environment in modern highway construction. It is reported that the performances of Asphalt pavement could be enhanced by using OMMT modified Asphalt Binder. Because of unique layered structures and good dispersion in the Asphalt Binder in nanometer scale, the OMMT exhibits excellent mechanical enhancement properties. The profound research is important for the application of OMMT modified Asphalt concrete in practice projects. So the profound researches on the rheological properties are necessary. The specimens which including origin Binder and the layered nanometer MMT content of 1 wt%, 3 wt%, 5 wt% were prepared to do Frequency Sweep using Dynamic Shearing Rheometer (DSR). The rheological data was analysed by producing complex modulus and phase angle master curves. Effects of MMT concentration to the dynamic mechanical response of Asphalt Binder in wider frequency range were analyzed.

Peiliang Cong - One of the best experts on this subject based on the ideXlab platform.

  • Rheological and Fatigue Properties of Epoxy Asphalt Binder
    International journal of pavement research and technology, 2015
    Co-Authors: Peiliang Cong, Hongming Shang, Hua Zhao
    Abstract:

    Epoxy Asphalt Binder is a different thermosetting material from Asphalt or common polymer modified Asphalt Binders. It is difficult to evaluate epoxy Asphalt Binder performance using traditional Asphalt characterization methods. This makes it hard to understand for engineers or researchers. In this study, theology and fatigue properties of epoxy Asphalt Binder were investigated. The dynamic shear rheometer (DSR) test using column specimens was conducted to examine the rheological and fatigue properties of epoxy Asphalt Binders. The time temperature superposition principle (TTS) was employed to calculate the rheological properties at different temperatures and frequencies. Mathematical equations and mechanical models were employed to describe the rheological properties of epoxy Asphalt Binder. Fatigue performance of epoxy Asphalt Binder was researched using stress-controls, and testing temperature and loading were also considered in this study. The results indicated that the epoxy Asphalt Binder demonstrates a better ability to maintain an elastic/viscous capability. In addition, the time temperature superposition (TTS) principle can be applied to evaluate epoxy Asphalt Binder, and the linear viscoelastic behavior of epoxy Asphalt Binder can be satisfactorily described using Huet-Sayegh modle. The results of fatigue life can be predicted using the phenomenological fatigue model. The dynamic shear rheometer (DSR) test using column specimens is a reliable test method for evaluating thermosetting epoxy Asphalt Binder's performance.

  • investigation of Asphalt Binder containing various crumb rubbers and Asphalts
    Construction and Building Materials, 2013
    Co-Authors: Peiliang Cong, Mingliang Xing, Shuanfa Chen
    Abstract:

    Abstract Crumb rubbers (CRs) have been proposed for the pavement because it is a waste materials and crumb rubbers modified Asphalt pavement shows excellent performance. The effects of the Asphalt, crumb rubbers type and crumb rubbers contents on the properties of crumb rubbers modified Asphalt Binders were investigated. The penetration, softening point, viscosity, dynamic shear rheometer (DSR), bending beam rheometer (BBR) and fluorescent microscope test were carried out. Experimental results indicated that the penetration, ductility and phase angle of Asphalt Binder was decreased, and the softening point, elastic recovery, viscosity, complex modulus and rutting parameter of Asphalt was increased when crumb rubbers was added into Asphalt. Compared with the ambient grinding crumb rubber (B), modified Asphalt Binder with the cryogenic grinding crumb rubber (A) has better pavement performance. In addition, the properties of crumb rubbers modified Asphalt (A 2 ) with 80/100 are better than that of modified Asphalt with (A 1 ) 60/80 at high and low temperature. The high swelling rate of crumb rubbers is favorable to prepare successfully crumb rubbers modified Asphalt Binder. The micrograph of crumb rubbers modified Asphalt Binders indicated that the light weight fraction in Asphalt promoted a swelling of crumb rubbers in the modified Asphalt Binder, and crumb rubbers with high swelling rate improved the crumb rubbers disperse in Asphalt to form continuous and interlocked phase.

  • effects of diatomite on the properties of Asphalt Binder
    Construction and Building Materials, 2012
    Co-Authors: Peiliang Cong, Shuanfa Chen, Huaxin Chen
    Abstract:

    Abstract Modified Asphalt Binders were prepared by melt blending with different contents of diatomite. Fourier Transform Infrared (FTIR) Spectroscopy was used to test the effects of diatomite on chemical properties of Asphalt Binder. The effects of diatomite on the physical properties and dynamic rheological behaviors of the modified Asphalt were investigated. The high temperature storage stability and aging properties of the modified Asphalt Binders were also studied. Experimental results indicated that there is no chemical reaction occurred between Asphalt Binder and diatomite. The storage stability tests indicated that the Asphalt modified with diatomite is very stable when diatomite content is less than 20%. With the enhancement of the content of diatomite to Asphalt, both viscosity and complex modulus of modified Asphalt Binders increased rapidly at high temperatures. Furthermore, the diatomite modified Asphalt Binders exhibited lower phase angle when temperature below to 5 °C. As a consequence, the viscoelastic properties of the diatomite modified Asphalt Binders was modified, which improve its resistance to deformation at high temperatures and the resistance to thermal cracking at low temperature.

  • effects of aging on the properties of modified Asphalt Binder with flame retardants
    Construction and Building Materials, 2010
    Co-Authors: Peiliang Cong, Shuanfa Chen, Jianying Yu, Shaopeng Wu
    Abstract:

    Abstract Effects of aging on the properties of Asphalt Binders modified by incorporating Styrene–Butadiene–Styrene (SBS) and flame retardants (FR) were studied. Asphalt Binders were artificially aged in the rolling thin film oven (RTFOT) and Pressure Aging Vessel (PAV). The flame retardancy of modified Asphalt Binders were characterized using limited oxygen index (LOI), and the effects of aging on the properties of Asphalt Binders were studied using Brookfield viscometer test and dynamic shear rheometer test. Experimental results indicated that the flame retardancy of Asphalt Binder was increased after aging. But the increasing amount of LOI is low when the modified Asphalt Binder containing more flame retardants. The variation of the LOI, softening point, penetration, ductility and viscosity of Asphalt Binder decreased with flame retardant content increasing, meaning the flame retardants can improve the thermo-oxidative aging resistance of Asphalt Binder. Furthermore, the G * /sin  δ , stiffness and m -value of flame retardant modified Asphalt Binders display smaller changes after two different aging.

Xiaoming Huang - One of the best experts on this subject based on the ideXlab platform.

  • Combustion Properties and Multistage Kinetics Models of Asphalt Binder Filled with Flame Retardant
    Combustion Science and Technology, 2011
    Co-Authors: Tao Xu, Xiaoming Huang
    Abstract:

    To validate the feasibility of magnesium hydroxide (MH) used as flame retardant, thermogravimetry experiments and the thermal analysis kinetics method were used to investigate the effects of MH on combustion properties of Asphalt Binder. The results indicate that the combustion process of Asphalt Binder is multistage. Due to MH thermal decomposition, the temperature rising in Asphalt Binder is inhibited, and the increase in residue yield ratio on Asphalt material surface facilitates to retard the further combustion of Asphalt Binder. Also, combustion models for Asphalt Binder and flame-retarding Asphalt Binder in each combustion stage all follow nucleation and nuclei growth models. Three-stage combustion kinetics models are developed to predict combustion process of Asphalt Binder. It is concluded that the thermal stability of Asphalt Binder is improved by mixing MH, and MH can be used as a flame retardant in tunnel Asphalt pavement to replace part filler during the Asphalt pavement construction.

  • Effect of moisture on the aging behavior of Asphalt Binder
    International Journal of Minerals Metallurgy and Materials, 2011
    Co-Authors: Tao Ma, Xiaoming Huang, Enad Mahmoud, Emil Garibaldy
    Abstract:

    The moisture aging effect and mechanism of Asphalt Binder during the in-service life of pavement were investigated by laboratory simulating tests. Pressure aging vessel (PAV) test simulating the long-term aging of Binder during the in-service life of pavement was modified to capture the long-term moisture aging effect of Binder. Penetration grade tests including penetration test, soften point test, and ductility test as well as Superpave™ performance grade tests including viscosity test, dynamic shear rheometer test, and bending beam rheometer test were conducted to fully evaluate the moisture aging effect of Binder. Fourier transform infrared spectroscopy test and Gel-permeation chromatography test were applied to provide a fundamental understanding of the moisture aging mechanism of Binder. The results indicate that moisture condition can accelerate the aging of Asphalt Binder and shorten the service life of Asphalt Binder. The modified PAV test with moisture condition can well characterize the moisture aging properties of Asphalt Binder.

  • Combustion properties of Asphalt Binder containing flame retardant
    Fire and Materials, 2011
    Co-Authors: Tao Xu, Xiaoming Huang
    Abstract:

    SUMMARY Combustion characteristics of Asphalt Binder containing flame retardant (magnesium hydroxide, MH) were investigated using thermogravimetry and Fourier transform infrared spectrometer, and multistage combustion model of Asphalt Binder was developed. The results indicate that the combustion processes of Asphalt Binder and MH-modified Asphalt Binder both include three main sequential stages. But with the MH concentration increase, the release amount of flammable volatiles is reduced, and the Asphalt Binder ignition time is delayed. Asphalt Binder thermal stability is improved by incorporation of MH. At the same MH concentration, the kinetics parameters increase from the first to third stage. But in each stage, the kinetics parameters exhibit an increase trend in the first stage as the MH content increases, but in the second and third stages, the kinetics parameters show a trend of first increase and then decrease. Furthermore, the parameters reach the maximum at the concentration of around 20% by weight. This concentration may be appropriate for flame-retarding Asphalt Binder. It is concluded that MH may be used as a new kind of environment-friendly flame retardant for Asphalt Binder, and the developed thermal analysis kinetics model can be employed to evaluate the combustion characteristics of Asphalt Binder. Copyright © 2011 John Wiley & Sons, Ltd.

  • Pyrolysis properties and kinetic model of an Asphalt Binder containing a flame retardant
    Journal of Applied Polymer Science, 2010
    Co-Authors: Tao Xu, Xiaoming Huang
    Abstract:

    In this study, thermogravimetry (TG) experiments were employed to study the influence of magnesium hydroxide (MH) on the pyrolysis characteristics of an Asphalt Binder. Pyrolysis models of the Asphalt Binder were developed to reveal the flame-retarding mechanism of MH. The TG experimental results showed that the pyrolysis process of the Asphalt Binder in N2 was a one-stage reaction. The Asphalt Binder containing MH had a higher residue yield ratio at a high temperature, and TG and differential TG curves showed a dramatic shift toward higher temperatures with an increase in the MH concentration; this indicated that MH inhibited the thermal decomposition of the Asphalt Binder. By optimal identification of the pyrolysis mechanism function, the pyrolysis reaction of the Asphalt Binder was found to follow the model of one-dimensional diffusion (parabolic law), whereas that of the flame-retarding Asphalt Binder followed the model of three-dimensional diffusion (the Ginstling–Brounshtein equation). On the basis of the models, the calculation results for the pseudo activation energy indicated that the thermal stability of the Asphalt Binder in the pyrolysis process was obviously improved by the addition of MH. We conclude that the flame retardancy of Asphalt Binders can be enhanced by the use of MH, and MH may be a potential flame retardant for Asphalt Binders used in tunnel Asphalt pavement. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

  • study on combustion mechanism of Asphalt Binder by using tg ftir technique
    Fuel, 2010
    Co-Authors: Tao Xu, Xiaoming Huang
    Abstract:

    Abstract The combustion mechanism of Asphalt Binder was investigated by using thermogravimetric analyzer coupled with Fourier transform infrared spectrometer (TG–FTIR) in a mixed gas environment of 21% oxygen and 79% nitrogen. The results show that the combustion process of Asphalt Binder consists of three main consecutive stages at a low heating rate. The combustion reaction becomes more and more intense from the 1st to 3rd stage. The release of volatiles occurs mainly at 300–570 °C, and the gaseous products in each stage are different. The main products in the 1st stage are CO 2 , CO, H 2 O, hydrocarbons, formaldehyde, tetrahydrofuran, formic acid, aromatic compounds, etc. In the next stage, the combustion products mentioned above keep on increasing, but some new volatiles such as alcohols, phenols, styrene, etc. are present. In the last stage, the C H and C O bonds continue to fracture and aromatization reaction occurs, and the release amount of CO 2 , CO, and H 2 O reaches the maximum. But the content of other products decreases or even disappears due to burning. Among the above volatiles, CO 2 is the dominant gaseous product in the whole combustion process. The concentration of CO 2 and CO keeps increasing, and reaches the maximum intensity at about 520 °C. The evolution of H 2 O, CH 4 , and formic acid exhibits the trend of increase first, and then decrease. Over 570 °C, there are few products released at the end of the combustion process. Asphalt Binder combustion process includes two modes of complete and incomplete combustion, and the latter may be main combustion mode of Asphalt Binder.

Decheng Feng - One of the best experts on this subject based on the ideXlab platform.

  • Properties of Asphalt Binder modified by corn stalk fiber
    Construction and Building Materials, 2019
    Co-Authors: Zining Chen, Junyan Yi, Zhiguo Chen, Decheng Feng
    Abstract:

    Abstract The properties of Asphalt Binder modified with corn stalk fiber were investigated in this study. The physical-mechanical behaviors of the fiber modified Asphalt Binder were studied by the penetration and softening point tests, dynamic shear test, bending beam rheometer test and rotational viscosity test. The results indicate that the addition of corn stalk fiber decreases the penetration and increases the softening point of the Asphalt Binder. Furthermore, the addition of the corn stalk fiber increases the complex modulus and decreases the phase angle of the Asphalt. The creep stiffness of the Asphalt Binder at low temperatures first decreases and then increases with an increase in corn stalk fiber content. The variation of the m-value of the Asphalt Binder is the opposite to which of the creep stiffness. The corn stalk fiber has good uniformity in the Asphalt Binder, followed by basalt fiber and finally lignin fiber. The viscosity results indicate that the addition of corn stalk fiber can increase the viscosity of the Asphalt Binder, and the temperature sensitivity of the Asphalt Binder decreases.

  • properties of Asphalt Binder modified by bio oil derived from waste cooking oil
    Construction and Building Materials, 2016
    Co-Authors: Junyan Yi, Yudong Huang, Decheng Feng
    Abstract:

    Abstract The properties of Asphalt Binder modified by bio-oil derived from waste cooking oil were researched. Firstly, four components separation test and fourier transform infrared spectroscopy (FT-IR) test were carried out to investigate the chemical compositions of experimental materials. Then the physical and mechanical behaviors of bio-oil modified Asphalt Binders were studied by penetration grading tests, rotational viscosity (RV) test, separation tendency test, dynamic shear rheometer (DSR) test and bending beam rheometer (BBR) test. Four components separation test results indicate that bio-oil is mainly composed of aromatics, resins and saturates. Almost no chemical reactions between bio-oil and control Asphalt are noticed through FT-IR test results. The addition of bio-oil decreases the softening point and viscosity, increases the penetration and ductility of control Asphalt Binder. Separation tendency test results demonstrate that bio-oil and control Asphalt have good compatibility under static heated storage conditions. Furthermore, the addition of bio-oil decreases the complex modulus and creep stiffness, increases the phase angle and m-value of Asphalt Binder, which means that adding bio-oil could reduce the deformation resistance and elastic recovery performance of control Asphalt, and improve the stress relaxation property and also helps to the improvement of thermal cracking resistance of control Asphalt.

Hao Wang - One of the best experts on this subject based on the ideXlab platform.

  • rheological properties and anti aging performance of Asphalt Binder modified with wood lignin
    Construction and Building Materials, 2017
    Co-Authors: Guangji Xu, Hao Wang
    Abstract:

    Abstract This study evaluated the potential use of wood lignin as partial substitute and performance modifier in Asphalt Binder. The rolling thin film oven (RTFO) and pressure aging vessel (PAV) methods were performed on Asphalt samples to simulate different aging conditions. The Rotational Viscosity (RV), Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) tests were utilized to explore the influence of adding lignin on the rheological properties of Asphalt Binder. The Fourier Transform Infrared Spectroscopy (FTIR) was used to evaluate the anti-aging performance of lignin on Asphalt Binder. The rutting resistance of lignin modified Asphalt Binder at the high temperature was evaluated using Multi Stress Creep and Recovery (MSCR) test, while the fatigue life of Asphalt Binder was characterized using Linear Amplitude Sweep (LAS) test. The viscosity test results showed that the addition of wood lignin into Asphalt Binder caused stiffening effect. The DSR and BBR test results implied that adding lignin positively affected high-temperature rutting performance without adversely influencing low-temperature. The MSCR results indicated that the lignin improved the elastic recovery and reduced non-recoverable deformation of Asphalt Binder. The FTIR results indicates that the presence of lignin can help resist the formation of carbonyl structure in the aging process, and thus improved aging resistance of Asphalt Binder. The LAS test results showed that fatigue resistance of Asphalt was negatively affected by lignin. The study results suggest that wood lignin is a promising modifier for Asphalt materials with economic savings and environmental benefits.

  • molecular dynamics study of interfacial mechanical behavior between Asphalt Binder and mineral aggregate
    Construction and Building Materials, 2016
    Co-Authors: Guangji Xu, Hao Wang
    Abstract:

    Abstract This study aims to study the deformation and failure behavior of the Asphalt-aggregate interface using molecular dynamics (MD) simulations. The 12-component Asphalt molecular models and the hydrated silica substrate were employed to form a bi-material interface system. Physical properties of Asphalt Binder were predicted from MD simulations including density and glass transition temperature for model validation with experimental data. Tensile simulations were performed and the stress-separation responses were obtained to analyze the interfacial mechanical behavior. It was found that the interface failure was mainly adhesive failure although large air voids were formed in the bulk Asphalt as the loading rate decreases to a certain level. The interface failure strength and post-peak deformation are affected by loading rate and temperature that is consistent the viscoelastic behavior of Asphalt Binder. The stress-separation responses match the cohesive zone model (CZM) model that is usually observed in the pull-off strength test at the macroscopic scale. The relationship between chemical compositions of Asphalt Binder and the interface failure parameters was investigated. The MD simulation shows promising results to understand mechanical failure of Asphalt-aggregate interface at the atomistic scale.