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In order to improve the compressive strength of cement stabilized macadam base, dense structures will be used to make an optimization on gradation. Based on the theory of embedded crowded gradation, after five tests on the gradation of cement stabilized macadam and set the unconfined compressive strength as the evaluation index, then the optical gradation of framework dense structure will be got and...
The aging of asphalt binder is an important factor to asphalt pavement service property, the paper applied short-term age to asphalt binder by using RTFO, and then aged the residue various hours by using PAV. The authors studied the effects of aging on static viscoelastic performance of asphalt binder through bending beam rheometer tests on the PAV residue.
Asphalt concrete is a typical non-uniform material, in the mechanical analysis it is generally considered homogeneous and isotropic body. But the theoretical analysis results are difficult to reconcile with actual. At the same time homogeneous hypothesis is also very difficult to explain the phenomena that crack layer's cracking resistance of coarse aggregate of bitumen macadam is better than small...
A large amount of deformation which caused by expansive soil with water, bring about the highway diseases of expansive soil area. The theory of temperature stress field is applied to analyze the deformation of expansive soil embankment induced by uneven increased humidity, and based on temperature stress field theory, to analyze the mechanical response of pavement, and get the additional stress of...
On the basis of the investigation which is about the 10 service areas of the Beijing-Zhuhai Expressway in the Henan Province and the 11 service areas of Lian-Huo high-speed, we got the vehicle condition characteristics of China's current highway service area, and then carried through the pavement distress survey of the services area. According to the survey results, we summed up the main damage type...
As the semi-rigid asphalt pavement rutting and so prone to disease and cement road surface is due to a large number of joints affected by driving comfort, so open-graded asphalt gravel infusion epoxy resin modified cement mortar to form a semi-rigid asphalt pavement can be overcome pavement and cement pavement deficiencies. This article describes the perfusion of the material composition of semi-rigid...
In order to study the influence of different molding methods on asphalt macadam performance and the indexes on mixture tests, three molding methods were utilized, including the large scale Marshall molding method, the rolling molding method and the vibrating molding method. The Marshall indexes of the asphalt macadam mixture compacted by the three methods were compared and analyzed, and the volume...
In order to study the influence of different gradation on asphalt macadam performance, three mixture gradations were utilized, and the low temperature anti-cracking performance, high temperature stability and water stability of the asphalt macadam mixture were studied. Through bending beam test, freeze-thaw split test and wheel track rutting test, the indexes of the mixtures were contrasted. The test...
In order to study the anti-cracking mechanism of large-stone asphalt base, a multi-layer elastic theory program is utilized to calculate the load stress in different pavement structures. Then the Finite-Element model is established based on an instant heat-conducting hypothesis to calculate the temperature stress and the strain of pavement structure when temperature is lowered. The stress and the...
Adding reclaimed asphalt mixture into cement-stabilized macadam base is a good way to save our resources, lower the construction cost and reduce environment pollution. This paper relies on the reconstruction and extension project for henan anxin expressway, adopts the low cement content and the skeleton dense aggregate gradation, analyzes the reclaimed asphalt mixture influence on the shrinkage performance...
A new model for variable speed limit in freeway work zone was presented. Model predictive control was applied to optimizing variable speed limit in freeway work zone. The classic macroscopic traffic model METANET was a little modified for simulating the traffic in the work zone, considering the effect of speed limit. One new optimization model for solving the optimal variable speed was proposed, which...
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