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Yang Y.-H.,South China University of Technology | Wu C.-H.,Guangdong Hualu Transport Technology Co Ltd | Ge T.,South China University of Technology | Fu X.-S.,South China University of Technology
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition)

Stop sight distance (SSD) is an important control parameter in highway design. The freeway sight distance is always blocked because the passenger car turns left with high speed and is very close to the medians in mountainous area, which has great impact on safety. Since the parameters of SSD model are adopted unreasonably, the combination operating speeds prediction and the field test was taken into consideration, and operating speed and braking deceleration were synthesized to modify the SSD model of passenger car. The SSD values were calculated based on different longitudinal gradients. Adopting design value of horizontal sightline offset of 2.45 m or 2 m, the minimum left curve radii were calculated to satisfy the need of SSD. Highway 3D dynamic sight distance model was established with consideration of influencing factors of cross section and passing lane. The results show that the design values of horizontal sightline offset are always not long enough, and SSD are 200 m and 170 m for the design speeds of 100 km/h and 80 km/h. In addition, the horizontal sightline offset should be improved and sight guiding safety facilities should be added when left turn sight distance is not long enough to ensure the actual driving safety in freeway passing lane in mountainous area. Source

Lv D.W.,Changan University | Xu G.J.,Changan University | Sun X.L.,Guangdong Hualu Transport Technology Co Ltd
Advanced Materials Research

The effective treatment of void cement concrete pavement slab through grouting technology is the important premise of ensuring the service performance of asphalt overlay engineer on cement concrete pavement. Based on the current problems of grouting technology, we did experimental studies on the mixing proportion of grout slurry and analyzed the effects of slurry composition and admixture type on mechanical properties including the strength, mobility, viscosity, expansion rate and bleeding rate of the slurry and on the service performance. Based on these, we put forward the control indexes for grouting slurry mix proportion determination which provided guidance for the design and construction quality control of grouting under the old cement concrete pavement slab. © (2014) Trans Tech Publications, Switzerland. Source

Lv D.W.,Changan University | Shi S.B.,Changan University | Sun X.L.,Guangdong Hualu Transport Technology Co Ltd
Advanced Materials Research

Rigid Pavement composite performance is more complex, there is no analytical formulas can better predict its mechanical properties. This article by buried sensors in ShanMei Expressway Cement Asphalt Paving Project, on-site monitoring of the actual variation of the mechanical properties of the composite pavement structure, this study provides a theory basis for the optimization design of highway asphalt overlay structure of Cement Concrete Pavement. © (2014) Trans Tech Publications, Switzerland. Source

Jing L.,Guangxi University | Xiaoxuan G.,Guangxi University | Yuzhao J.,Guangxi University | Niuniu B.,Guangxi University | And 2 more authors.
Journal of Computational and Theoretical Nanoscience

This paper investigates the relationship between the microstructure and the performance of Buton Rock Asphalt (BRA). The investigation is conducted using surface free energy and an infrared spectrum analysis. Conventional experiments are carried out on BRA mixtures. The results reveal those higherature performances and BRA mixture water damage resistance all exhibit significant enhancements within a given ratio of m-rock to m-base of 1:1.25. The infrared spectrum analysis indicates that mixing the BRA is a physical modification. In contrast, surface free energy resulted in the increase of the hydrophobicity of the asphalt mixtures, along with an increase of rocking asphalt content. The conventional test, the infrared spectrum analysis and the surface free energy, all complement each other. Together, their comprehensive utilization is beneficial for evaluation the relationship between the BRA microstructure and its performance. © 2015 American Scientific Publishers All rights reserved. Source

Wang Q.,Guangdong Hualu Transport Technology Co Ltd | Wang Q.,South China University of Technology | Liu Y.-S.,Guangdong Hualu Transport Technology Co Ltd | Zhang W.-Z.,Guangdong Hualu Transport Technology Co Ltd | And 3 more authors.
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition)

Till now weigh-in-motion systems for vehicles based on electrical measurement have some shortages such as low capacity of resisting disturbance and lack of stability, while optical measurement based on laser can cover the shortages. Based on the principle of bending plate to weigh the weight of vehicle axis rolling on it and of optical Bragg grating fiber sensors to get strains of bending plate, combined with the axis characteristics of vehicles on highway, a set of high speed WIM(weigh-in-motion) based on optical Bragg grating fiber sensors with high speed interrogator and bending plate was developed, in which material selection, structural design and the software for data acquisition and interpretation were discussed. The accuracy of the developed WIM was verified by comparing the weight of axis and the total weight of vehicle tested on-site and weighed by weigh bridge, which satisfied the American standard ASTM E1318. The practic-ability of the developed WIM was verified by test with a commercial one. The results show that such a high speed WIM can be used to collect information of running vehicles on bridges, such as the axis weight, the total weight, the speed and the wheelbases of vehicles, which is essential for further study on the vehicle load on highway bridges. Source

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