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The contact state between layers of asphalt pavement not only has a significant effect on the mechanical response of road structure but is also the bottleneck of research on the mechanical behavior of pavement structure at present. In this paper, the effects and laws of different water–salt entry modes, salt solution concentrations, and temperature...
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Context 1
... to Goodman, when the relative horizontal displacement u occurs between the upper and lower layers of the pavement, the shear stress of the interlayer interface can be expressed as follows. The schematic diagram of the model as shown in Figure 2. ...
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Compared with ordinary asphalt pavement, the application of modified asphalt will improve the performance of asphalt pavement. However, using the same modification method for the whole road section can cause modification waste or result in some parts not meeting performance standards. This paper proposes a whole road section modification method. Fi...
Citations
... Xu et al. investigated the transport property of chloride salt in asphalt mixtures under different working conditions based on Fick's second law [19]. Ran et al. used ABAQUS software to simulate the 45 • shear test for the contact state between the base layer and asphalt layer under the effects of different salt solution concentrations and temperatures [20]. Xiong et al. carried out the durability evaluation of asphalt mixture in the salt corrosion condition under the effect of dynamic water pressure via a splitting test [21]. ...
In order to ensure smooth traffic and driving safety, deicing salt or snow melting agents are usually adopted to solve the problem of traffic jams and prevent pavement surfaces from freezing. The objective of this present study is to investigate the performance deterioration evaluation of asphalt mixture under the chloride salt erosion environment. Five chloride salt solution concentrations were designed and the uniaxial static compression creep test, low-temperature IDT test, freeze-thaw splitting test, and freeze-thaw cycle test were carried out for asphalt mixtures (AC-16) soaked in chloride salt solution. Results showed that with the increase in chloride salt solution concentration, the high-temperature stability, low-temperature crack resistance, and water stability of the asphalt mixture decreases. Moreover, the high-temperature stability, low-temperature crack resistance, and water stability of the asphalt mixture show a decreasing trend under different chloride salt solution concentrations following the negative cubic polynomial function. Based on the viscoelastic analysis, chloride salt solution could reduce the ability of the asphalt mixture to resist instantaneous elastic deformation and permanent deformation, and this influence will become more obvious with the increase in chloride salt solution concentration. In addition, the salt freeze-thaw cycle test indicated that in the early stage of freeze-thaw cycles, the splitting tensile strength of the asphalt mixture decreases rapidly, then tends to be flat, and then decreases rapidly. This study explores the performance damage law of asphalt mixture under salt corrosion, and the analysis results of this study could provide some references for the chloride salt dosage in the snow melting project while spreading deicing salt.
With the increasingly extensive application of road engineering, it is inevitable to consider the durability of pavement in harsh environment. In the southeast coastal areas, northwest salt lakes and saline soil areas of China, harsh natural climate conditions and enhanced salt have a significant negative impact on the service life of asphalt pavements. In addition, the durability of asphalt pavement has suffered irreparable harm of the man-made salt environment. In this paper, five typical salt environment characteristics of asphalt pavement has been analyzed. The experimental conditions affecting the durability of asphalt concrete are determined. Then the durability deterioration mechanism of asphalt concrete is discussed under the coupling action of salt and multiple factors. Subsequently, the evaluation methods of asphalt concrete are categorized and summarized using scales for road performance and structure. Finally, according to the degree of salt erosion damage of asphalt concrete, a series of measures to alleviate salt erosion are proposed. The results show that the performance of asphalt concrete suffers significantly in salt environment, and the cohesion of asphalt and the adhesion of asphalt-aggregate interface are key factors in the durability of asphalt concrete. It has beneficial theoretical and practical significance for improving the durability of asphalt concrete under harsh natural environment.
Geocomposites are extensively used in asphalt pavements as they provide significant long-term pavement benefits. Indeed, when correctly installed, geocomposites enhance road pavement performance thanks to their waterproofing properties, stress absorbing membrane interlayer (SAMI) action and improved mechanical strength of the pavement. Nevertheless, the presence of an interlayer causes de-bonding effects that negatively influence the overall pavement characteristics. This paper presents an experimental investigation aimed at comparing the interlayer bonding characteristics of four different geocomposites with an unreinforced reference configuration, laid on an Italian motorway section, in which the reinforcement depth and the lower layer surface condition (milled or new) were also varied. Interlayer shear strength (ISS) was measured, on both cores and laboratory produced specimens, through Leutner and Ancona Shear Testing Research and Analysis (ASTRA) equipment. The ISS results showed that geocomposites can be successfully applied directly on milled surfaces. Moreover, the application of a normal stress, as in the ASTRA device, tends to mitigate any difference related to the specimen heterogeneity. Finally, existing laws, which correlate the results obtained with different shear equipment on unreinforced interfaces, were generalized by considering the presence of geocomposites and the corresponding ISS specification limits were proposed for both ASTRA and Leutner test.
