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Wang L.,Chongqing University | Wang L.,Chongqing Zhixiang Paving Technology Engineering Co. | Wang Y.Q.,Chongqing University | Silva J.,University of Beira Interior
Journal of Mechanical Engineering Research and Developments | Year: 2016

With the increase in the number of cars in the modern society, the quality of the road has been paid more and more attention. The useful life of the highway is rather short, the phenomenon of the early destruction of the pavement is widespread, the main reason is that its compaction degree is insufficient. Compaction degree is the key to the construction quality control of asphalt concrete pavement, and it is one of the most economical and effective technical measures to ensure the strength and stability of pavement. This paper introduced several compaction degree detection techniques to describe the operation principle and the process of detecting the compaction quality of road surface in highway construction. Which also analyzed the factors affecting the experimental results, and pointed out different test results of different operation, then demonstrated the effect of test method on the quality of pavement construction.


Li L.,Chongqing Zhixiang Paving Technology Engineering Co. | Hao Z.,Chongqing Zhixiang Paving Technology Engineering Co. | Hao Z.,China Merchants Chongqing Communications Research and Design Institute Co. | Wang M.,Chongqing Zhixiang Paving Technology Engineering Co. | And 2 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2016

The macro properties of two kinds of high elastic asphalt were tested, results show that the ductility, penetration and -10℃ bending strain of high elastic 1# modified asphalt decrease rapidly over time, while softening point increases. On the contrary, the macro mechanical properties of high elastic 2# modified asphalt basically remain unchanged. Furthermore, the infrared attenuated total reflection method (ATR) combined with quantitative analysis of infrared spectrum were applied to characterize the component precipitation of both high elastic modifiers, the results indicate that high elastic 1# precipitates from asphalt to the surface, and the precipitation increases over time. In contrast, no phenomenon of high elastic 2# precipitation is observed, indicating the precipitation resistance of high elastic 2# is better than that of high elastic 1#. The analysis suggests that the properties reduction of high elastic 1# modified asphalt stems from the precipitation of high elastic 1#. © 2016, Editorial Board of Polymer Materials Science & Engineering. All right reserved.


Qian J.,Chongqing University | Wang Q.,Chongqing University | Wu W.,Chongqing Zhixiang Paving Technology Engineering Co. | Zhang H.,Chongqing Zhixiang Paving Technology Engineering Co.
Materials and Design | Year: 2013

Use of modified asphalts in preparation of gussasphalt (GA) concrete could reduce the demand of lake asphalt or low-grade straight asphalt, but the fatigue performance still needs to be studied further. Using a composite-modified asphalt (CMA) consisted of AH-70# asphalt, lake asphalt, SBS modifier and other agents, this work investigated the effect of mixing temperature, oil-stone ratio of mixture and strain level of loading on the fatigue performance of the resulting concretes. It is shown that when CMA was used, the mixing temperature should be elevated to 230-240°C and oil-stone ratio increased to 8.5 in order to meet the requirement of laying construction process. The number of cycles Nf to fatigue failure was up to 0.5 million or more under the strain level of 800×10-6. This work finally compared the fatigue performance of the GA concrete made from CMA with those of other asphalt concretes and presented the error analysis of testing results using an existing assessment method, from which it was concluded that a new assessment method should be proposed for the evaluation of the fatigue performance of CMA concretes. © 2013 Elsevier Ltd.


Zhang Y.,Chongqing Jiaotong University | Li L.,Chongqing Zhixiang Paving Technology Engineering Co. | Hao Z.,Chongqing Zhixiang Paving Technology Engineering Co. | Sheng X.,Chongqing Zhixiang Paving Technology Engineering Co.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2016

The contribution mechanism of oxidization and volatilization of SBS modified asphalt under the epithermal aging mode was analyzed quantitatively by combining the macro analysis and microanalysis. By researching the aging law of three indicators at different aging temperatures and DSR rutting factor in the air atmosphere and high purity nitrogen atmosphere respectively, and combining the microscopic characterization method of Fourier infrared spectrum, the contribution rate of oxidization and volatilization of SBS modified asphalt was quantitatively calculated so as to demonstrate the aging mechanism of SBS modified asphalt under the epithermal aging mode, implying that the oxidization is the main factor, but with the rising of epithermal aging temperature, the non-oxidization factors such as volatilization gradually become another main factor of epithermal aging. In macro analysis, from the low temperature aging 163℃ to epithermal high temperature aging 198℃, the ratio between the contribution rate of oxidization and that of volatilization to the reduction of needle penetration of SBS modified asphalt changes from 6:4 to 1:1, and the ratio of contribution rate to the reduction of ductility changes from 7:3 to 1:1, and the ratio of contribution rate to the rutting factor changes from 24:1 to 2:1; from the infrared spectrum micro analysis, the ratio of contribution rate of oxidization and volatilization to the reduction of unsaturated double bond after the epithermal aging of SBS modified asphalt changes from 7:3 to 1:1. © 2016, Editorial Board of Polymer Materials Science & Engineering. All right reserved.


Wang M.,Chongqing Jiaotong University | Wang M.,Chongqing Zhixiang Paving Technology Engineering Co. | Liang N.-X.,Chongqing Jiaotong University | Xiao L.,Chongqing Zhixiang Paving Technology Engineering Co. | Lan C.,Chongqing Zhixiang Paving Technology Engineering Co.
Materials Science Forum | Year: 2016

The numerical analysis model and analytic formula, concerning flexural-tensile composite modulus of steel deck paving materials, were established with five-point loading composite beams, in order to explore the modulus value of steel deck paving materials. Regarding the three typical asphalt pavement material such as SMA10, GA10 and EA10, the composite modulus of paving material was calculated by analyzing stepwise loading data, and a universal flexural-tensile composite modulus range is proposed: SMA10 is 500 ~ 550MPa, GA10 is 500 ~ 600MPa, EA10 is 650 ~ 700MPa. The results show good agreement between the modulus of the numerical analysis method and analytical formula method. The proposed analytical formulas can calculate the flexural-tensile composite modulus more easily according to the actual load conditions, and the modulus value played a significant role in guiding the design and mechanical analysis of steel deck pavement system. © 2016 Trans Tech Publications, Switzerland.


Hao Z.,China Merchants Chongqing Communications Research and Design Institute Co. | Hao Z.,Chongqing Zhixiang Paving Technology Engineering Co. | Li L.,Chongqing Zhixiang Paving Technology Engineering Co. | Wang M.,Chongqing Zhixiang Paving Technology Engineering Co. | Sheng X.,Chongqing Zhixiang Paving Technology Engineering Co.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2015

Through in situ dynamic infrared spectral analysis technology, it shows that the C=C bond is attacked by oxygen atoms during the styrene-butadiene-styrene block copolymer (SBS) super heat aging process at 250℃, and its absorption peak decreases with aging time, meanwhile a series of oxidation products are generated, such as carbonyl, hydroxyl and ether bond and etc, as the aging continues with time, SBS becomes more aged; through two-dimensional correlation infrared analysis technology, it further indicates that in the SBS super heat aging process, oxygen atoms will attack methylene in the SBS molecular chain at the same time, mainly asymmetric methylene, then symmetric methylene, which results in free radicals; by contrasting and analyzing the synchronous spectrum and asynchronous spectrum, it reveals in SBS super heat aging process, the change of carbonyl group peak goes after ether bond, and hydroxyl peak goes after carbonyl group, the generation rate of oxidation products is ether>carbonyl>hydroxyl groups; the main existing form of carbonyl group is aldehyde ketone, accompanied by a small amount of carboxylic acid. ©, 2015, Chengdu University of Science and Technology. All right reserved.


Zhang H.,Chongqing University | Zhang H.,Chongqing Zhixiang Paving Technology Engineering Co. | Qian J.-S.,Chongqing University | Wu W.-J.,Chongqing Zhixiang Paving Technology Engineering Co. | And 2 more authors.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2011

According to the stress equivalence assumption, the damage increment of stiffness modulus of gussasphalt concrete (GA) with the accumulation of loading number is divided into 3 stages in case of using stiffness modulus as a fatigue damage parameter. The third stage, which is characterized by the distinct change of mechanical property, is defined as the stage of fatigue cracking. Based on the character of fatigue damage of GA at different temperature, the critical damage factor (D p) for GA was defined. It is shown that there is a power function relationship between damage factor (D) and fatigue life of GA when failure. Furthermore, a fatigue damage model, considering the influence of temperature, is established by fitting the damage factor of GA with an appropriate function.


Zhang H.,Chongqing University | Zhang H.,Chongqing Zhixiang Paving Technology Engineering Co. | Qian J.-S.,Chongqing University | Wu W.-J.,Chongqing Zhixiang Paving Technology Engineering Co. | Hao Z.-H.,Chongqing Zhixiang Paving Technology Engineering Co.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2011

Through four-point fatigue bending test, the cumulation process of gussasphalt (GA) mixture stiffness modulus with load cycles was divided into three stages, and the third stage when the macro mechanical performances were greatly changed was defined as fatigue crack appearance stage of GA mixture. The respective relations among strain level, asphalt content, test temperature and stiffness modulus as well as fatigue life were researched in the experiment. The results show that: the first stage when the specimen exhibits an 80% reduction in stiffness modulus relative to the initial stiffness accounts for 5%-10% of total fatigue life; the second stage during which the reduction becomes slowly and demonstrats a liner relationship with load number accounts for 70%-85% of the fatigue life; and the third stage is about 5%-10%. The results indicate that gussasphalt mixture has excellent fatigue durability at a higher strain level; and the fatigue life of gussasphalt mixture can't be improved by increasing asphalt content. Fatigue life of gussasphalt mixture is susceptible to temperature, and it increases with temperature.

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