Abstract
Focusing on the characteristics of structures of the CRC+AC composite pavement as well as the insufficient studies, the crack generation and extension mechanisms of the AC layer are studied by applying the fracture mechanics theory and finite element method. In addition to the above, the tip stress intensity factor of the load-type crack and temperature-type crack of the AC layer is calculated, the influence of the crack extension period, crack length, structural layer thickness, modulus, and other factors to the crack extension of the AC layer are analyzed and studied. And, the study results show that: the extension period of cracks of the AC layer has some impacts on the crack extension strength. the increased thickness of the AC layer can well delay the crack expansion of the AC layer, the impact of the thickness of the CRC layer on the crack extension of the AC layer is minor or none fundamentally, The extension strength of the temperature-type crack of the AC layer will linearly increase along with the increased modulus of the AC layer, and the change of the load-type crack is minor, and the impact of the modulus of other structural layers on the crack extension strength of the AC layer is very minor. And, the study results can be made as the reference basis of the rational design of the CRC+AC composite pavement.DOI: http://dx.doi.org/10.5755/j01.mech.18.2.1559
Highlights
The continuously reinforced concrete and asphalt composite pavement (CRC+AC) is featured by high integral structure strength, superior driving comfort, long service life, and low maintenance cost, which is deemed as the development direction of the long-life asphalt pavement structure of the heavy-load transportation expressway [1,2,3]
The study results can be made as the reference basis of the rational design of the CRC+AC composite pavement
When the AC layer thickness is increased by 1cm, the crack extension strength will be increased by 3.5% approximately
Summary
The early damage of the asphalt pavements of our country is very serious, and the service life of the asphalt pavement of the expressway is shorter than the designed purpose frequently. The continuously reinforced concrete and asphalt composite pavement (CRC+AC) is featured by high integral structure strength, superior driving comfort, long service life, and low maintenance cost, which is deemed as the development direction of the long-life asphalt pavement structure of the heavy-load transportation expressway [1,2,3]. The paper, based on the fracture mechanics, elastic multilayer theory, and other fundamental theories, are applied with the finite element method and stress intensity factor to describe the crack extensions, establish the relationships among the stress intensity factor, structural layer thickness, modulus, crack length, and crack extension period, and study the crack mechanism of the AC layer of the CRC+AC composite pavement as well as the influence factors of the crack extension strength of the AC layer under the effects of the load and temperature as well. The study results can be made as the reference basis of the rational design of the CRC+AC composite pavement
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