Shijiazhuang Bureau of Transportation

Shijiazhuang, China

Shijiazhuang Bureau of Transportation

Shijiazhuang, China
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Yao Y.-S.,Chang'an University | Li Y.-W.,Shijiazhuang Bureau of Transportation | Shi X.,Shijiazhuang Bureau of Transportation | Feng Z.-X.,Chang'an University | Zhu W.-M.,Hangzhou Applied Acoustics Research Institute
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology | Year: 2012

In order to discuss the dynamic effects on the process of double-frequency composed vibration, the two DOF(degree of freedom) dynamic model of double-frequency composed vibratory compactor and soil was built. With the help of dynamic simulation, the relations of frequencies and some parameters, as between the upper and lower chassis displacements, acceleration, vibrating force and effect force on the ground caused by compactor (EFOG), were analyzed. It was shown that the dynamic model of double-frequency composed vibratory compactor and soil had two natural frequencies, and with the change of vibrating frequencies, the upper and lower chassis displacements and acceleration presented 1st order and 2nd order formats. Different from vibrating force, EFOG was affected synchronously by vibrating parameters and soil. As important factors, the amplitudes had more actions on EFOG than the frequencies. It was pointed out that the amplitudes should be adapted to the soil and the lower frequency should be a little higher than the 2nd order natural frequency.


Tan Y.-Q.,Harbin Institute of Technology | Wang H.-P.,Harbin Institute of Technology | Sun Z.-J.,Harbin Institute of Technology | Li Y.-W.,Shijiazhuang Bureau of Transportation | Shi X.,Shijiazhuang Bureau of Transportation
Proceedings 2011 International Conference on Transportation, Mechanical, and Electrical Engineering, TMEE 2011 | Year: 2011

The study on the calibration method of FBG sensor used to measure strain of asphalt mixture is the precondition of FBG sensor application in asphalt pavement information monitoring. In this paper, monitoring results of indoor small size test process tested by traditional resistance strain gauge and FBG sensor are compared and analysed to complete FBG sensor calibration. The preparation process of three-layer composite rutting specimen buried with strain gauge and FBG sensor is studied based on the analysis of measuring principle of strain gauge and FBG sensor. The dynamic response in rutting test is monitored, by which, the regression relationship of monitoring results tested by two kinds of test elements is established. Based on three-point bending test of small beam, the tensile strain of beam bottom monitored by resistance strain gauge is compared with theoretical strain. Finally, the calibration equation of FBG sensor test results is established. © 2011 IEEE.


Huang W.,Tongji University | Tian J.,East China Electric Power Design Institute | Li B.,Tongji University | Li Y.,Shijiazhuang Bureau of Transportation
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2014

Asphalt rubber (AR) was prepared in a routine way by using AC type continuous dense gradation to replace previous used broken gradation.AR mixture was used as stress absorption layer that is similar to Strata.Firstly, through design method of the target void the changes in grading was analyzed.Then, four-point loaded bending fatigue test was conducted to study the influencing factors of fatigue performance and the design of AR mixture.Finally, compared with the ARAC-13 and Strata stress absorbing layer mixture and high addition SBS modified asphalt mixes, the road performances of AR mixture was determined.According to the study, the gradation with optimal porosity is obtained when the passing rate(by mass) for 4.75mm is 55%, that for 2.36mm is 10% and that for 1.18mm is 25% 30%.The increase of asphalt content and the reduction of the void fraction will enhance its fatigue life.Based on the study, it is recommended that penetration of 80 or so should be selected, and asphalt content(by mass) in asphalt rubber should be 9% 10%.Meanwhile, the mineral powder is not added in the mixture.The AR mixtures have the better fatigue performance and better stability at high temperature.Compared with other mixtures, AR stress absorbing layer mixtures has cost-effective advantages. ©, 2014, Tongji University. All right reserved.


Yang G.,Tongji University | Huang W.-D.,Tongji University | Li Y.-W.,Shijiazhuang Bureau of Transportation | Yuan J.,Tongji University
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2010

Asphalt rubber mixture was made by base asphalt and crumb rubber used in domestic's pavement engineering. By systematic laboratory rutting tests, the relationships between dynamic stability of asphalt rubber mixture and 177°C brookfield viscosity, softening point, penetration of asphalt rubber binder were studied. The results indicate that the 177°C brookfield viscosity and softening point of binder can be used as evaluation index for the high-temperature performance of asphalt rubber mixture. The results also indicate that the Americal requirement(ASTM D 6144-97) for 177°C brookfield viscosity and softening point are inconvenient and corresponding asphalt rubber mixture rutting test result may be too low according to Chinese specification(JTJ F40-2004) for polymer-modified mixture. So more convenient requirement for 177°C brookfield viscosity and softening point are advised based on laboratory rutting tests and domestic's engineering experience. The results also indicate that high-temperature performance of asphalt rubber mixture remarkably varies with different types of crumb rubber.


Yao Y.-S.,Chang'an University | Li Y.-W.,Shijiazhuang Bureau of Transportation | Shi X.,Shijiazhuang Bureau of Transportation | Feng Z.-X.,Chang'an University | Ma J.-X.,Chang'an University
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition) | Year: 2013

In order to obtain industrial application of double-frequency composed vibratory compaction, 20 tons industrial prototype with double-frequency composed vibratory roller was designed based on experimental results of small prototype. The performance of industrial prototype and 20 tons ordinary vibratory roller was tested by field experiments and the results were compared. The results indicate that the industrial prototype at any time could realize composition of two frequencies and their amplitudes, and its reliability can meet national standard; the industrial prototype has obvious superiority in deep-seated compaction, which has better compaction ability than ordinary vibratory roller; compaction degree of midsoil and subsoil is improved by 2.1% and 3.4% respectively; the shock of the hydraulic system of the roller is the same in the process of starting vibration; the vibration power is similar in steady work; in the process of stop shock, the shock of hydraulic system is less and stop vibration time is shorter, and stop shock was softer. It was proved that the industrial prototype with double-frequency composed vibration meets design requirements and has higher performance than ordinary vibratory roller, and can be developed in industrial application.


Li Y.,Shijiazhuang Bureau of Transportation | Shi X.,Shijiazhuang Bureau of Transportation | Guan T.,Shijiazhuang Municipal Engineering Design and Research Institute Co. | Yao Y.,Chang'an University | Chen S.,Shijiazhuang Bureau of Transportation
WIT Transactions on the Built Environment | Year: 2013

In this paper, a simulation of the thermal deformation of a paver screed based on thermal theoretical analysis was carried out using ANSYS software. The results showed that the thermal deformation of the paver screed at more than 130°C resulted in its warping and level expansion to be formed the paver screed of a trapezium. A design method of the thermal deformation compensation of the paver screed was put forward, and the paver screed of an inverted trapezium whose upper side was longer than down side was designed according to the simulation data. This design could avoid the warping and offset the level expansion to retain the lever of the upper plate of the paver screed, and in theory achieve an optical smoothness of asphalt pavement. The design of the paver screed based on the thermal deformation compensation provided an effective approach for construction equipment to improve the smoothness of asphalt pavement. © 2013 WIT Press.


Yao Y.,Chang'an University | Feng Z.,Chang'an University | Li Y.,Shijiazhuang Bureau of Transportation | Shi X.,Shijiazhuang Bureau of Transportation
Advanced Materials Research | Year: 2012

For improving compaction process, a method of double-frequency composed vibrating compaction was proposed, which based on resonance and antifriction principle. The method was different from the traditional variable-frequency and variable-amplitude compaction method, which has one frequency and associated amplitude. Double-frequency composed vibrating compaction method has two different frequencies and associated amplitudes simultaneously, thus enhanced resonance and antifriction of asphalt mixture, and large amplitude oscillation was prone to deep transmission of impact energy. The results showed that double-frequency composed vibrating compaction machine got higher degree of compaction than that of traditional machine with same tonnage, 2.6% higher in surface layer and 3.1% higher at the position 15 cm far from surface. Double-frequency composed vibrating compaction method was better than traditional method in concerned with the compactness in layers, and had obviously advantage of deep compaction.

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