Abstract
The influence of temperature on the shear performance of asphalt mixtures and the feasibility of using the deformation strength as an index of the high-temperature shear performance of these mixtures were explored in this study. Taking AC-13C and AC-20C asphalt mixtures as the research objects, uniaxial compression, rutting, deformation strength, and uniaxial static load creep tests were carried out at temperatures 40°C, 45°C, 50°C, 55°C, and 60°C. The correlations between the deformation strength and modulus of resilience, compressive strength, dynamic stability, and stiffness of the asphalt mixtures were studied. The test results show that the influence of temperature on the compressive strength, resilience modulus, and deformation strength of the asphalt mixtures decreases significantly as the temperature increased, and the rutting deformation of the two kinds of asphalt mixtures increased as the temperature increased. Strong correlations exist between the deformation strength and the modulus of resilience, the compressive strength, and the dynamic stability of asphalt mixtures, so the deformation strength can be used as an evaluation index of the high-temperature shear performance of asphalt mixtures.
Highlights
Asphalt pavement diseases mainly include cracks, ruts, and pits. e rut disease includes fluid ruts and structural ruts. e former refers to the repeated action of wheel rolling under high-temperature conditions when the load stress exceeds the stability limit of the asphalt mixture. e latter refers to the permanent deformation of each structural layer under the asphalt surface, including the roadbed, due to the load exceeding the strength of the pavement layer. e rutting of asphalt pavement is mainly related to the permanent deformation of asphalt mixtures at high temperatures. erefore, it is essential to reduce the rutting rate of asphalt pavement by studying the permanent deformation characteristics of asphalt mixtures at high temperatures
Karami et al [6] analyzed the permanent deformation of asphalt pavement mixtures through dynamic creep tests
According to the median gradation of AC-13C and AC-20C asphalt mixtures specified in “Technical specifications for construction of highway asphalt pavements” (JTG F40-2004) [19], the mineral aggregate gradation composition is designed, which can ensure the stability of the mineral aggregate gradation of the specimen and reduce the test error caused by the heterogeneity of raw materials
Summary
Asphalt pavement diseases mainly include cracks, ruts, and pits. e rut disease includes fluid ruts and structural ruts. e former refers to the repeated action of wheel rolling under high-temperature conditions when the load stress exceeds the stability limit of the asphalt mixture. e latter refers to the permanent deformation of each structural layer under the asphalt surface, including the roadbed, due to the load exceeding the strength of the pavement layer. e rutting of asphalt pavement is mainly related to the permanent deformation of asphalt mixtures at high temperatures. erefore, it is essential to reduce the rutting rate of asphalt pavement by studying the permanent deformation characteristics of asphalt mixtures at high temperatures. Erefore, it is essential to reduce the rutting rate of asphalt pavement by studying the permanent deformation characteristics of asphalt mixtures at high temperatures. E uniaxial static penetration test method has been extensively used to study the high-temperature permanent deformation characteristics of asphalt mixtures due to its advantages of simple instrumentation and convenient operation [7, 8]. Advances in Materials Science and Engineering repeated shear test to study the permanent deformation characteristics of asphalt mixtures under different stress levels [13, 14]. E above research results demonstrate that the uniaxial penetration test can better simulate the actual pavement stress state under wheel loading Based on the aforementioned research, a cylindrical uniaxial compression test and a rutting test were carried out for AC-13C and AC-20C asphalt mixtures. e pressure head of the single-axle static load penetration test was improved to more closely simulate the load action form of vehicle tires on asphalt pavement. en, the deformation strength test and the uniaxial penetration creep test were carried out with the improved circular indenter. e correlations between the deformation strength and the compressive rebound modulus, the compressive strength, and the dynamic stability of asphalt mixtures were studied. e feasibility of using the deformation strength as an evaluation index of the high-temperature shear performance of asphalt mixtures was discussed
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