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Shaopeng Wu – 1st expert on this subject based on the ideXlab platform
characteristics of bonding behavior between basic oxygen furnace slag and Asphalt BinderConstruction and Building Materials, 2014Co-Authors: Zongwu Chen, Yue Xiao, Juyong Chen, Shaopeng WuAbstract:
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 analysisConstruction and Building Materials, 2014Co-Authors: Shaopeng Wu, Min ZhouAbstract:
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 retardantsConstruction and Building Materials, 2010Co-Authors: Peiliang Cong, Shuanfa Chen, Jianying Yu, Shaopeng WuAbstract:
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.
Peiliang Cong – 2nd expert on this subject based on the ideXlab platform
Rheological and Fatigue Properties of Epoxy Asphalt BinderInternational journal of pavement research and technology, 2015Co-Authors: Peiliang Cong, Hongming Shang, Hua ZhaoAbstract:
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 AsphaltsConstruction and Building Materials, 2013Co-Authors: Peiliang Cong, Mingliang Xing, Shuanfa ChenAbstract:
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 BinderConstruction and Building Materials, 2012Co-Authors: Peiliang Cong, Shuanfa Chen, Huaxin ChenAbstract:
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.
Xiaoming Huang – 3rd expert on this subject based on the ideXlab platform
Combustion Properties and Multistage Kinetics Models of Asphalt Binder Filled with Flame RetardantCombustion Science and Technology, 2011Co-Authors: Tao Xu, Xiaoming HuangAbstract:
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 BinderInternational Journal of Minerals Metallurgy and Materials, 2011Co-Authors: Tao Ma, Xiaoming Huang, Enad Mahmoud, Emil GaribaldyAbstract:
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 retardantFire and Materials, 2011Co-Authors: Tao Xu, Xiaoming HuangAbstract:
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.