Communications Research Institute of Liaoning Province

Shenyang, China

Communications Research Institute of Liaoning Province

Shenyang, China
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Sun Y.,Shenyang Jianzhu University | Zhang M.,Shenyang Jianzhu University | Zhao F.,Communications Research Institute of Liaoning Province
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

In this paper, the mechanical response of reflective cracking in asphalt concrete pavement under dynamic vehicle loading is proposed. A finite element model is established in ANSYS, and, A half-sine dynamic loading is used to simulate the vehicle loading. And Finally, the dynamic response of the pavement reflective cracking is analyzed under different vehicle load, different crack length and time. The results indicate that the normal stress and maximum vertical deflection on the surface is periodic change with time, The influence for normal stress and maximum vertical deflection on the surface on account of crack length and overload is remarkable, whereas, the influence for pavement deflection on account of crack length is not remarkable. © 2011 IEEE.

Wang B.,Dalian University of Technology | Wang B.,Communications Research Institute of Liaoning Province | Zhang X.-F.,Dalian University of Technology | Dai J.-G.,Hong Kong Polytechnic University | And 2 more authors.
Journal of Central South University of Technology (English Edition) | Year: 2011

Critical crack tip opening displacement (CTODc) of concrete using experimental and analytical evaluation with seven different compressive strengths ranging from 30 up to 150 MPa was studied based on two types of fracture tests: three-point bending (TPB) and wedge splitting (WS). In the tests, the values of CTODc were experimentally recorded using a novel technique, in which fiber Bragg grating (FBG) sensors were used, and two traditional techniques, in which strain gauges and clip gauges were deployed. The values of CTODc of tested concrete were also predicted using two existing analytical formulae proposed by JENQ & SHAH and XU, respectively. It is found that the values of CTODc obtained by both experimental measurements and analytical formulae exhibit a negligible variation as the compressive strength of concrete increases, and the test geometry adopted has little impact on the value of CTODc. Regarding the experimental measurement of CTODc, the clip gauge method generally leads to a larger value of CTODc and shows a more significant scatter as compared with the other two methods, while the strain gauge method leads to a slightly lower CTODc as compared with the FBG sensor method. The analytical formula proposed by JENQ and SHAH is found to generally lead to an overestimation, while the analytical formula proposed by XU shows a good accuracy. © Central South University Press and Springer-Verlag Berlin Heidelberg 2011.

Liu J.,Dalian University of Technology | Chen J.,Dalian University of Technology | Liu Y.,Communications Research Institute of Liaoning Province | Zhou C.,Dalian University of Technology
Asphalt Pavements - Proceedings of the International Conference on Asphalt Pavements, ISAP 2014 | Year: 2014

Dynamic response is an important indicator in estimating long- Term performance of a pavement structure. To obtain dynamic responses, field measurement is a direct and realistic method. In this study, a multidirectional strain measurement is performed in a highway section paved by two structures: An inverted pavement and a semi-rigid pavement. Accelerated loads are imposed by a full-scale Mobile Load Simulator (MLS). A comparison on dynamic responses from the two structures is made. Two loading positions, central and eccentric loading, are performed alternately. The strains are measured by strain gauges. The results show the maximum tensile strain at the bottom of asphalt mixture in the inverted pavement is higher than that in the semi-rigid pavement at both loading positions. It is concluded that the bottom-up fatigue crack would be the potential failure mode of inverted pavement since the introduction of graded crushed stone interlayer decreases the material stiffness under asphalt mixture. Crack observation from the inverted pavement confirms this failure. The measurement under various axle amplitudes shows that there is a good agreement between strain increments and tire contacted pressure increments. Therefore, when the heavy vehicles are concerned, the tire contacted pressure, rather than the load amplitude, should be the primary parameter in fatigue prediction. © 2014 Taylor & Francis Group, London.

Wang B.,Communications Research Institute of Liaoning Province | Wang B.,Zhejiang University | Xu S.,Zhejiang University | Liu F.,Shenyang Highway Plan and Design Institute
Construction and Building Materials | Year: 2016

Pull-out test were performed to evaluate the tensile bonding strength between ultra-high toughness cementitious composite (UHTCC) and old concrete. Six surface roughnesses of concrete, two surface roughnesses of prefabricated repair material, four strengths of concrete substrate, four types of primer and five types bonding agent were utilized. Three curing ages including 28 days, 120 days and 1 year were considered. As a comparison, some new repair materials, including cast-in-situ UHTCC (CUHTCC), prefabricated UHTCC (PUHTCC), cast-in-situ steel fiber reinforced concrete (CSFRC) and cast-in-situ new concrete (CNC), were presented. The analysis of variance of F-Test was employed to evaluate correlation between the bond strength and influencing factors. And two regression models were developed to predict the tensile bonding strength between CUHTCC/PUHTCC and concrete. Results indicated enhancing surface roughness of old concrete, increasing substrate strength could improve the bond strength; but too high roughness could weaken the surface zone and the suitable roughness had a limit value. Fly ash, silica fume, expansive agent and SBR latex could improve the primers and bonding agents, and enhanced the bond strength. The long-term bond strength of UHTCC repair system was higher as compared with other repair system. Besides, differing from cast-in-situ repair system, the prefabricated repair system had two interfaces, and bond strength could be determined by the weaker interface. It was also found that F-test was an effective ways to assess test results and the two proposed models had a good potential to predict tensile bonding strength. © 2016 Elsevier Ltd. All rights reserved.

Zhao F.,Shenyang University | Zhao F.,Communications Research Institute of Liaoning Province | Wang K.,Communications Research Institute of Liaoning Province | Zhang S.,Communications Research Institute of Liaoning Province
2010 International Conference on E-Product E-Service and E-Entertainment, ICEEE2010 | Year: 2010

As an economic, quick, effective pavement preventive maintenance (PPM) technology, Micro-surfacing Treatment is playing the very important role in Chinese for developing highway today. The article unified the domestic and foreign experimental regulations and the literature related to micro-surfacing, took Liaoning Province Shen-Shan highway preventive maintenance item as the backing, made the comprehensive analysis and elaboration about micro-surfacing from the aspect of raw material choice, mixture ratio design, construction and quality control. And it is proved fully that Micro-Surfacing may prevent the road surface smooth effectively with plant repair wheel rut diseases and so on. ©2010 IEEE.

Chen X.-L.,Northeastern University China | Sun Y.-S.,Northeastern University China | Han Y.-X.,Northeastern University China | Tian Z.-F.,Communications Research Institute of Liaoning Province
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

The organic bentonite was used to modify the asphalt for pavement. According to the road test results of organic bentonite modified bitumen, the SEM and DSC methods were further used to investigate the mechanism of modified bitumen by analyzing the difference of the dispersing state and DSC atlas when organic bentonite, SBS and SBR were used as modifiers in bitumen. The relationship between the mechanism and the performance was also discussed. The result showed that there had good consistency between organic bentonite and asphalt, where organic bentonite was uniformly dispersed in the asphalt and crosslinking happened, making the colloform texture and components in asphalt change. Thus the macroscopic road performance of asphalt is enhanced.

Li Z.,Harbin Institute of Technology | Li Z.,Key Laboratory of Advanced Material and Intelligent Control Technology on Transportation Safety | Li Z.,Communications Research Institute of Liaoning Province | Wu H.,Harbin Institute of Technology | And 5 more authors.
Key Engineering Materials | Year: 2014

Due to the fire effect, a frame underpass bridge had suffered a huge damage in Changjiang road in Harbin in the direction to Acheng. One span of the bridge was burned in large area, parts of which were burned badly. Many adjacent beams turned black at bottom of roofs; parts decoration of side wall were damaged to some extent. As a result, both directions of the traffic were disrupted, causing traffic jams. To make sure of repairing and restoring the traffic during the shortest period, Harbin municipal committee established the Changjiang road rescue headquarters. Under the precondition of utmost to save money and ensure that the repaired underpasses technology standards meet the design requirements, the research group were about to use steel plate or carbon fiber sheet as the reinforcing material, after detecting and identifying the bridge damage. Through a comprehensive consideration for the ascension of normal section bearing capacity of two reinforcing materials, pasting carbon fiber sheet was adopted to complete repair reinforcement scheme. © (2014) Trans Tech Publications.

Zhao F.,Shenyang University | Zhao F.,Communications Research Institute of Liaoning Province | Yu T.,Shenyang University | Yu T.,Hubei Engineering University | Cheng J.,Shenyang University
2010 International Conference on Mechanic Automation and Control Engineering, MACE2010 | Year: 2010

The studying team prepared stress-absorbing material interlayer (SAMI) modified asphalt mixture by the best use of local conditions to test its actual modulus of elasticity, Combining with actual local conditions, Studying team ultimately determine the SAMI practical elastic modulus, which was applied to ANSYS finite element method (FEM) software to calculate the different stress effect of the SAMI thickness, Through analyzing the stress-strain laws with the change of asphalt mixture SAMI thickness under traffic loads, we learned that SAMI eases its own stress a little by increasing its thickness, SAMI thickness change has little effect to the maximum bending deflection values in overlay surface and the bending deflection and the bending deflection difference on both sides of seams. Finally we determine a optimum value of asphalt mixture SAMI thickness for the locally available materials to meet the requirements of anticracking for both design and construction at the maximum limit. ©2010 IEEE.

Zhao F.,Shenyang University | Zhao F.,Communications Research Institute of Liaoning Province | Yu T.,Shenyang University | Yu T.,Hubei Engineering University | Cheng J.,Shenyang University
2010 International Conference on Mechanic Automation and Control Engineering, MACE2010 | Year: 2010

Author tests small beam repeated bending fatigue test to the modified asphalt mixture stress-absorbing material Interlayer(SAMI) made up of local practical materials by controlling strain mode, and compares the fatigue performance of the other four kinds of materials commonly used, The results show that the preparation of AC-SAMI has a very good anti-fatigue properties, and can significantly improve the life of the road. ©2010 IEEE.

Wang H.,Harbin Institute of Technology | Wang H.,Chinese Research Institute of Highway | Tan Y.,Harbin Institute of Technology | Sun Z.,Harbin Institute of Technology | And 3 more authors.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2016

In order to explore rut deformation characteristics of airport SMA (stone mastic asphalt) under overload, and provide data support for asphalt mixture of mesoscopic models establishing, the angle changes of aggregates in high temperature deformation process of airport SMA asphalt mixture was studied. Angle changes of aggregates in asphalt mixture under high temperature and high load was studied by the method of coring from rutting specimens. 3D digital images of asphalt mixture before and after the rolling was recorded and reconstructed based on X-ray CT technology. 2D images along and vertical to the wheel track were extracted from digital specimens. MATLAB image batch processing procedure was taken to obtain binary images. Angles of aggregates were calculated statistically. Results show that the cumulative distribution of asphalt mixture aggregate angle obeys to three parameters Weibull distribution. Angles of aggregates are most in 0°20° intervals. After rolling, aggregate angles along the direction of the wheel track keep increasing in 0°20° interval, aggregate angles vertical to the direction of the wheel track keep increasing in 40°60° range. The angle changes of aggregates along the wheel track have linear relationship with rut deformation. SMA with 70# asphalt is more likely to deflect than SBS modified asphalt SMA mixture. © 2016, Editorial Department of Journal of Building Materials. All right reserved.

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