Papers by Author: Shao Peng Wu

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Authors: Ji Qing Zhu, Shao Peng Wu, Jin Jun Zhong, Dong Ming Wang
Abstract: The construction and maintenance of roads in China require large amounts of aggregates and mineral filler. The use of recycled materials helps conserving natural resources. However, the inferior road performance and additional costs have hindered the widespread use of construction and demolition wastes (C&D wastes) in applications such as surface layers of asphalt pavement that may represent a value application for C&D wastes. Waste concrete, waste bricks and waste glass are selected for this study; and the surface layers of asphalt pavement is considered here as value application. Although there is a large potential for supplying C&D wastes now, a few barriers have effectively depressed the recycling activities. Such barriers are described here and a brief discussion suggests ways of their removal.
Authors: Ming Yu Chen, Shao Peng Wu, Ji Zhe Zhang, Pan Pan
Abstract: Asphalt pavement can be used in solar energy harnessing, by means of solar collector developed in heating and cooling the adjacent buildings, as well as keeping the pavement ice-free directly. In the light of the actual situation of preparation and formation of a larger asphalt concrete slab, an experimental method and evaluation system for asphalt pavement snow melting was designed and constructed. The feasibility of snow melting using asphalt solar collector was verified, and the effect of the heat exchanger on the temperature distribution was quantitatively tested The results indicated that although the entire snowmelt time is longer than expected, it is acceptable for us to use asphalt solar collector for snow melting, especially, low temperature water about 25°C is used for snow melting. Besides, the melting process of ice and snow generally includes three phases: the starting period, the linear period and the accelerated period. The snow melting system is controlled to maintain the asphalt pavement surface temperature of 3 to 5°C which is sufficient to prevent freezing of the road.
Authors: Shi Lin Yan, Wen Tao Li, Shao Peng Wu, Ling Pang
Abstract: The research on the conductive asphalt concrete(CAC) is to melt snow and ice on the pavement and improve the property of skid resistance. However, research at present mainly focuses on the electrical property not on the fatigue behavior which is also important to the application of CAC in the future. The specific rheological model is developed and the relation between creep and fatigue is investigated in this paper. By the single axial static creep test, the existed rheological model (Burgers model) and method of regression, the creep deformation of asphalt concrete is measured with time and parameters of the model are obtained. The results indicate that strain increases quickly with increasing time at initial loading phase, and then the change of strain tend to a stable value in a constant load. At unloading phase, strain decreases immediately and then keep another stable value which was greater than zero. The addition of conductive fillers improves the elastic properties and has no significant influence to the viscosity of asphalt concrete. In addition, the fatigue life can be predicted by the parameters of the Burgers model. The addition of conductive fillers improves energy dissipated, which leads to shorter fatigue life of conductive asphalt concrete compared to the control at levels of longer fatigue life.
Authors: Qun Shan Ye, Shao Peng Wu
Abstract: Dynamic shear test and creep shear test were employed to investigate the dynamic properties of various fiber modified asphalt binders with the fiber content of 1.0%. The test results indicate that complex shear modulus of asphalt binders containing fibers are increased while the phase angles are decreased greatly, which implies that the asphalt binder is reinforced by the addition of fibers and the elastic property of asphalt binder is improved significantly, especially at high frequency levels. The total strain during loading period and the residual strain after the creep shear test of asphalt binders are reduced greatly by the addition of fibers. Furthermore, the creep modulus of fiber modified asphalt binders is increased and the development rate versus loading time of creep modulus is decreased.
Authors: Ji Zhe Zhang, Shao Peng Wu, Martin Van de Ven, Feng Chen
Abstract: This paper investigated the influence of Rediset on the properties of base bitumen. The warm mix bitumen binder were produced by mixing a standard 40/60 pen bitumen with Rediset at fixed two proportions. The dynamic viscosity behaviour of the samples have been determined using dynamic shear rheometer with a cone and a fixed plate with a diameter of 25mm. The thermal stability of the Rediset was characterized and the result indicate that the physicochemical properties of Rediest are stable bellow 150°C. The dynamic viscosity result shows that the addition of Rediset can affect the flow behavior of the bitumen. Rediset decreases the viscosity of the binders, especially at the range of 100°C~150°C. The contribution of Rediset to the change of viscosity became less with the temperature increasing from 100°C to 150°C.
Authors: Shao Peng Wu, Jun Han, Xing Liu
Abstract: Bitumen is widely used in road construction. Due to heavy traffic loads and environmental factors, bitumen properties will change during service life. Bitumen will age due to diffusion of oxygen and UV radiation. Repeated loading will result in decreasing strength because of fatigue. In this paper, one layer clay powder was used to modify base bitumen with different mass contents. Then the influences of ultraviolet radiation (UV) aging on the dynamic fatigue properties of the layered clay powder were evaluated by Dynamic Shear Rheomoter (DSR) and Universal Testing Machine (UTM). The ageing evaluation shows that the ageing resistance of bitumen is improved and this improvement is more notable in bitumen fatigue than mixture.
Authors: Man Yu, Shao Peng Wu, Mei Zhu Chen
Abstract: To study the possibilities of volatilization in the asphalt pavement during service process, this paper presented an experimental investigation in the laboratory-based environment by simulating the circumstances of Infrared (IR) and Ultraviolet Radiation (UV). The Vacuum (Va) condition was also conducted to discuss the possibilities of volatilization in the asphalts. The changes of asphalt mass, chemical compositions and viscosity were conducted to analyze the experimental results. All the results on the circumstance of Va, that the decrement of asphalt mass, the decrement of light components and the increment of VI values, indicated that there may exist the volatilization in the asphalt. Different trends between IR and UV with asphalts demonstrate that the volatilization is affected by asphalt species and environmental conditions. In addition, ultraviolet radiation may take a vital role on the volatilization of asphalt.
Authors: Tian Gui Liu, Shao Peng Wu, Jun Han
Abstract: Montmorillonite(MMT)is a typical layered silicate. It has been widely used to modify polymers. It improves the thermal, mechanical and aging properties of polymers. The prominent features of MMT modified asphalt concrete are significant for prolonging the service life of asphalt pavement. The profound researches on the service performance and mechanical characteristics of MMT modified asphalt binder and mixtures are important for the application of MMT modified asphalt concrete in practice projects. The effect of MMT on the creep properties of asphalt mixture has been investigated in the research. The result showed that the physical capabilities of MMT modified bitumen was improved evidently. UTM 25 electro-hydraulic servo-universal testing machine was used to do Creep Text, and proper rheological models are employed to describe such characteristics. Results indicated that the visco-elastic properties of the mixtures can be changed by the use of MMT. The revised Burgers model is suitable for the visco-elastic property research of MMT modified asphalt mixtures. The model demonstrated that the retardant visco-elastic property and viscous property of asphalt mixtures containing MMT can be improved, which result in the enhancement of resistance to permanent deformation for MMT modified asphalt mixtures.
Authors: Jun Han, Shao Peng Wu, Deng Feng Zhang, Xing Liu
Abstract: Asphalt is an organic mixture with complex compounds and chemical structures which will change after exposed to heat, oxygen, and ultraviolet radiation (UV) and make the physical properties worse, especially at low temperature. In this paper, different aging levels (TFOT,UV-6days) of asphalt binders and mixtures with various mass ratio of layer clay powder to asphalt (0,3%,5%) were considered to investigate the low temperature rheological properties of aged asphalt binders and low temperature strength as well as fatigue properties. Dynamic Shear Rheomoter (DSR) and Universal Testing Machine (UTM) were used to evaluate low temperature properties of bitumen and mixture. From the results, after the addition of layer clay powder, the anti-aging properties is greatly improved and low temperature properties can be better maintained compared to base asphalt.
Authors: Yi Han Sun, Shao Peng Wu, Ji Qing Zhu, Jin Jun Zhong
Abstract: In order to improve the performance of granite asphalt mixtures, as well as make full use of waste concrete, the AC-25 asphalt mixtures were prepared using fine recycled concrete aggregate and coarse granite aggregate. The moisture stability, high-temperature property, low-temperature property and fatigue property of asphalt mixtures were investigated. Results indicate that fine recycled concrete aggregate (RCA) improves the moisture stability and low-temperature property of granite asphalt mixtures which can meet the requirements of China’s Technical Specification for Construction of Highway Asphalt Pavements (JTG F40-2004) and even are better than those of traditional limestone asphalt mixtures. Meanwhile, fine RCA makes the advantage of granite asphalt mixtures in high-temperature property more distinct with good fatigue property.
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