Co-reporter:Weihua Luo, Yihan Zhang, Peiliang Cong
Construction and Building Materials 2017 Volume 144(Volume 144) pp:
Publication Date(Web):30 July 2017
DOI:10.1016/j.conbuildmat.2017.03.105
•Asphalt binder containing waste oil and polymers is prepared.•Physical and high temperature rheology properties of asphalt binder are analyzed by tests.•The resistance aging ability of asphalt binder is improved by the waste oil and polymers.•Asphalt binder containing waste oil and polymers has better high and low temperature performance.•The waste oil can improve the compatibility of polymer modified asphalt binder.The asphalt binders containing polymer modifier are more and more widespread, which can effectively degrade the disable of asphalt pavement and improve the service life of the road. The waste oil is recycling resource required from natural oil, and it is harmful to the people healthy. The paper researched a new method of the polymer modified asphalt binder containing the waste oil and the relative properties were researched. Experimental results illustrated that the improvement of anti-aging property is noticeable when waste oil and polymer were added into asphalt. The results of dynamic shear rheometer (DSR) showed that the asphalt containing waste oil and polymers has the better high temperature property. Meanwhile, the repeated creep recovery test (RCRT) is employed to simulate the stress and deformation of asphalt binders in pavement. The results also showed that the asphalt binder containing the polymers and waste oil has lower deformation and better recovery. Finally, the storage stability of the asphalt binders is presented. The results proved that the effects of waste oil on storage stability of asphalt/waste oil/polymers blends are little and can be used in pavement after long time storage at high temperature.
Co-reporter:Peiliang Cong, Ning Liu, Yu Tian, Yihan Zhang
Construction and Building Materials 2016 Volume 123() pp:534-540
Publication Date(Web):1 October 2016
DOI:10.1016/j.conbuildmat.2016.07.073
•Diatomite modified asphalts were prepared by melt blending with diatomite.•Honeycomb silica structure in modified asphalt can prevent the oxygen.•Modified asphalt binder with diatomite has better aging resistance.•The oxygen dispersion in hydrophobic diatomite modified asphalt was harder.Diatomite modified asphalts were prepared by melt blending with different contents of diatomite and hydrophobic diatomite. The effects of long-term aging on physical properties and chemical structure of the diatomite modified asphalts were investigated. The results show that the viscosity aging index and the increment in the softening point of the modified asphalts decrease significantly with increasing diatomite contents. The retained penetration increases after the introduction of diatomite. The chemical structures of the aged asphalts were evaluated using FTIR. The increased extent of the CO and SO bands areas of the modified asphalt is smaller than that of pure asphalt. The aging resistances of the modified asphalts are much better than that of pure asphalt, because they can efficiently prevent the oxygen, which attribute to the honeycomb silica structure in the modified asphalts. Compared with diatomite modified asphalt, the oxygen dispersion in hydrophobic diatomite modified asphalt was harder, which means the oxidative aging resistance of hydrophobic diatomite modified asphalt was better.
Co-reporter:Peiliang Cong;Yu Tian;Ning Liu;Peijun Xu
Journal of Applied Polymer Science 2016 Volume 133( Issue 21) pp:
Publication Date(Web):
DOI:10.1002/app.43401
ABSTRACT
Epoxy asphalt (EA) binder has been used extensively for paving long-span bridges in many countries because it shows excellent heat resistance, is free from bleeding, has a low-temperature cracking resistance, and has aggregate scattering resistance. EA binders were prepared by the mixture of asphalt, epoxy resin, and a new curing agent (CR) with functional groups. The properties of the EA binder were characterized by their viscosity, tensile strength, elongation at break, compatibility, morphology, glass transition temperature (Tg), contact angle, and surface free energy. The curing process was analyzed. The results indicate that the curing temperature and asphalt content had significant effects on the properties of the EA binder. We observed that most of the strength was generated after the first 3 h at 165 °C; this provided good workability for EA pavement construction. The CR with various functional groups improved the compatibility and morphology of the EA binder. The test results show that Tg of the EA binder decreased and the contact angles increased with increasing asphalt content. It is worth noting the contact angles between water and the EA binder were always greater than 90°; this implied that the EA binder was hydrophobic and, hence, water repellent. The surface free energy and dispersion force increases with decreasing asphalt content. However, the polarity forces decreased with decreasing asphalt content. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43401.
Co-reporter:Peijun Xu, Peiliang Cong, Danggang Li, Xingtian Zhu
Construction and Building Materials 2016 Volume 122() pp:473-477
Publication Date(Web):30 September 2016
DOI:10.1016/j.conbuildmat.2016.06.087
Thermosetting epoxy asphalt, which has great mechanical properties and excellent thermal stability, is one of the preferred paving materials on steel bridge deck. However, because epoxy asphalt has high modulus and brittleness in cold environments, it still has a risk of propagating non-repaired brittle crack in winter. Hyperbranched polymer (HBP) can be used as an active modifier for epoxy asphalt to improve its toughness. It can be found that viscosities of HBP modified epoxy asphalts are slightly increased during curing process, but the percent elongation of epoxy asphalt could be effectively improved by HBP with enough tensile strength.
Co-reporter:Peiliang Cong, Yihan Zhang, Ning Liu
Construction and Building Materials 2016 Volume 113() pp:334-340
Publication Date(Web):15 June 2016
DOI:10.1016/j.conbuildmat.2016.03.059
•Recycling asphalt mixtures containing RAP, RA and control asphalt mixture were prepared.•RAP increase the stiffness and decrease the anti crack performance of asphalt mixture.•RA can restore and soften the binder in RAP and improve the fatigue of asphalt mixture.•RA can improve the anti crack performance of asphalt mixture containing RAP.With the increasing environmental considerations and rising costs of construction materials, reclaimed asphalt pavement (RAP) has been frequently added into asphalt paving mixtures during pavement construction. Many studies have been conducted with regard to the study of reclaimed unmodified asphalt pavement, but the reclaimed SBS modified asphalt pavement is still unknown. In this study, the effects of RAP and rejuvenating agent on the performance were studied. The moisture susceptibility, rutting resistance, dynamic modulus, low temperature anti cracking performance and fatigue was tested. Furthermore, in order to better understand the effects of RAP and rejuvenating agent, the control asphalt mixture was measured using the same methods. The results indicated that the asphalt mixture incorporating reclaimed SBS modified asphalt pavement with better moisture susceptibility, rutting resistance, dynamic modulus, low temperature anti cracking performance and fatigue resistance was obtained by blending new SBS modified asphalt binder and rejuvenating agent. Thus, the rejuvenating agent will benefit the effort of preparing more sustainable asphalt pavement containing RAP.
Co-reporter:Peiliang Cong, Weihua Luo, Peijun Xu, Hua Zhao
Construction and Building Materials 2015 Volume 91() pp:225-231
Publication Date(Web):30 August 2015
DOI:10.1016/j.conbuildmat.2015.05.041
•Recovery asphalt (RA) was obtained from recycle SBS modified asphalt mixture.•RSMA containing RA, fresh SMA and rejuvenators were prepared.•Rejuvenator II improve the aging resistance and decrease the viscosity of RSMA.•Regenerated modified asphalt binder has better aging resistance.The use of polymer modified asphalt binder in asphalt concrete pavements for over 20 years, large numbers of waste modified asphalt mixture have been produced. In this study, regeneration of waste SBS modified asphalt binder was investigated by adding fresh SBS modified asphalt binder and rejuvenating agents. Effects of content of rejuvenating agent and ratio of recovery asphalt to fresh asphalt on physical properties of regenerated SBS modified asphalt binder were researched. The rheological behavior and short-term aging of regenerated SBS modified asphalt binder was investigated and chemical compound was analyzed using Thin-layer chromatography/flame ionization detection (TLC/FID) and Fourier Transform Infrared (FTIR) Spectroscopy. The results indicated that regenerated SBS modified asphalt binder with both good physical properties and pavement performances was obtained by blending recovered SBS modified asphalt with fresh SBS modified asphalt and rejuvenating agent, and the optimum physical and rheological properties occurred when the ratio of recovery asphalt to fresh asphalt was 35:65 and the content of rejuvenating agent was 5 ∼ 10 wt%. The result of RTFOT indicated that the regenerated SBS modified asphalt binder have good aging resistance, especially rejuvenating agent II was used to reclaimed SBS modified asphalt binder.
Co-reporter:Peiliang Cong, Xiao Wang, Peijun Xu, Jianfei Liu, Rui He, Shuanfa Chen
Polymer Degradation and Stability 2013 Volume 98(Issue 12) pp:2627-2634
Publication Date(Web):December 2013
DOI:10.1016/j.polymdegradstab.2013.09.024
The Styrene–butadiene–styrene copolymer (SBS) triblock copolymer modified asphalt binder (SBSMA), applied in an overlay, and is easy to age in the field. Thus, the thermal aging and ultraviolet (UV) radiations aging of SBSMA must be considered for the research on the performance of asphalt pavement. Antioxidants and UV absorbers were employed to improve the antiaging resistance of SBSMA in this study. The results indicated that the SBSMA with antioxidants has good heat aging resistance, and SBSMA with UV absorbers blends have good photostability. The compound antiaging agents containing antioxidants and UV absorbers are a best choice to prepare SBSMA with better physical and antiaging resistance. The experimental results also indicated that the effects of antiaging agents on the physical properties of SBSMA are little at low contents. Especially conventional physical properties of SBSMA with 1 wt% of ZDDP and 0.5 wt% of UV531 are close to that of SBSMA.
Co-reporter:Peiliang Cong;Shanfa Chen;Jianying Yu
Journal of Applied Polymer Science 2011 Volume 121( Issue 4) pp:2310-2316
Publication Date(Web):
DOI:10.1002/app.33948
Abstract
Compared with the general pavement, the steel bridge deck pavement endure much larger deform and higher temperature. Epoxy asphalts were used to prepare modified asphalt concrete for steel bridge deck paving. The effects of epoxy resin contents on the fatigue life and creep properties of epoxy asphalt mixture were investigated in this study. The fatigue properties of epoxy asphalt mixtures were studied by the indirect tension fatigue test at different stress. A static creep test with a loading and recovery period was conducted on the asphalt mixture. The results showed that the fatigue life and recovery elasticity of asphalt mixtures with epoxy resins was large, which indicated that the fatigue property could be improved by epoxy resin. Compared with control asphalt, epoxy asphalt showed better resistance to deformation and recovery performance. Epoxy resin has caused a dramatic ascent in the creep stiffness modulus of asphalt mixture. And Burgers model can describe the creep performance of epoxy asphalt. Based on the obtained results, epoxy asphalt mixtures had decrease in permanent deformation and increase in fatigue life. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Co-reporter:Peiliang Cong;Shuanfa Chen ;Huaxin Chen
Polymer Engineering & Science 2011 Volume 51( Issue 7) pp:1273-1279
Publication Date(Web):
DOI:10.1002/pen.21934
Abstract
A procedure to improve the properties of styrene-butadiene-styrene (SBS) copolymer modified bitumen by grafting of maleic anhydride (MAH) onto SBS in the presence of benzoyl peroxide (BPO) as initiator was proposed. The effects of the grafting degree (GD) on the properties of modified bitumen were investigated. FTIR spectroscopy was employed to verify the grafting of MAH onto SBS. The GD of MAH onto SBS was determined by a back titration procedure. To assess the effects of the GD of grafted SBS on properties of modified bitumen, the softening point, penetration, ductility, elastic recovery, penetration index, viscosity, storage stability, and dynamic shear properties were tested. Experimental results indicated that the SBS grafted with maleic anhydride (SBS-g-MAH) copolymer was successfully synthesized by solvothermal method, and different GD of the SBS-g-MAH was obtained by control the MAH concentration. The GD of the MAH onto SBS has great effect on the rheological properties of the modified bitumen, and the high temperature performance and storage stability of modified bitumen were improved with the GD of the MAH onto SBS increasing. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers
Co-reporter:Peiliang Cong, Shuanfa Chen, Jianying Yu, Shaopeng Wu
Construction and Building Materials 2010 Volume 24(Issue 12) pp:2554-2558
Publication Date(Web):December 2010
DOI:10.1016/j.conbuildmat.2010.05.022
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.
Co-reporter:Cong Peiliang;Yu Jianying;Chen Shuanfa
Journal of Applied Polymer Science 2010 Volume 118( Issue 6) pp:3678-3684
Publication Date(Web):
DOI:10.1002/app.32440
Abstract
Epoxy-asphalt and its mixture have been proposed for the long span orthotropic steel deck bridges because it shows excellent heat resistance, free from bleeding, low temperature cracking resistance, and aggregate scattering resistance. In this study, the effects of epoxy resin contents on rheological properties of epoxy-asphalt binders were studied using dynamic shear rheometer. Experimental results indicated that the improvement of the viscoelastic performance of asphalt binder is noticeable at high temperatures, at which the elasticity is increased (higher G* and lower δ) for epoxy-asphalt with increase in epoxy resin contents. The viscous behavior of the asphalt also increased when epoxy resin is added. Creep test results indicated that epoxy-asphalt binder can not only resist deformation at elevated temperatures but recover satisfactorily from strain. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
Co-reporter:Peiliang Cong, Hongjie Hao, Yihan Zhang, Weihua Luo, Dianmei Yao
International Journal of Pavement Research and Technology (July 2016) Volume 9(Issue 4) pp:280-288
Publication Date(Web):1 July 2016
DOI:10.1016/j.ijprt.2016.08.001
Recycling asphalt pavement creates a cycle of reusing materials that optimize the use of natural resources. For optimal rejuvenation of the aged binder, the diffusion rate of the rejuvenator should be considered. However, the diffusion mechanism between the rejuvenator and aged asphalt is still far from understood. In this study, two experimental methods were conducted to research the diffusion of rejuvenator in aged asphalt. The two asphalt binders were identical in terms of asphalt A7 (60/80 pen) and asphalt A11 (100/120 pen) and two rejuvenators were identical in terms of RA (containing 90% alkyl aromatic oil and 10% saturate oil), and RS (containing 10% alkyl aromatic oil and 90% saturate oil). Experimental results indicated that two experimental methods are also an effective means to research the diffusion of rejuvenator in asphalt in spite of a slight difference. The effect of temperature on the diffusion coefficient is large and the effect of layer thickness of the rejuvenator on diffusion coefficient is obviously not. The rejuvenator RA has a high diffusion rate in asphalt over a wide range of temperatures. In addition, the diffusion coefficient of rejuvenator in asphalt A11 is larger than that in asphalt A7. The test data suggested that the use of rejuvenator with high diffusion is a viable option for recycling old asphalt mixture.
