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Effect of void fraction on low temperature cracking performance of dense graded asphalt concrete based on micromechanical model

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Document pages: 10 pages

Abstract: This study describes the effect of void ratio on the low temperature cracking behavior of dense graded asphalt concrete. The virtual low temperature bending beam test of dense graded asphalt concrete is established and implemented by using discrete element method and three-dimensional particle flow program (PFC3D). The influence of void content, distribution and size on the low temperature performance of dense graded asphalt concrete is analyzed through virtual test. The results show that the higher the void fraction is, the worse the low temperature performance of dense graded asphalt concrete is, especially when the void fraction exceeds the design air content; Even if the design voids are the same, the distribution of different voids in asphalt concrete will produce different crackslow-temperature properties of asphalt concrete, especially when the air void content in the central-lower part of testing sample varies. Bigger size of single air void which tends to form interconnected air voids within asphalt concrete has more harmful impacts on the low-temperature properties of asphalt concrete. Thus, to achieve satisfied low-temperature properties of dense-graded asphalt concrete, it is critical to ensure the designed air void content, improve the distribution of air voids, and reduce the interconnected air voids for dense-graded asphalt concrete.

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