The Skeleton Characteristics of Coarse Aggregates in Granular Thin-layer Asphalt Mixture
LI Wei1, HAN Sen1, HUANG Qibo2, YAO Tengfei1, XU Ouming3
1 Key Laboratory for Special Areal Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064; 2 Transportation Portage College, Southeast University, Nanjing 210096; 3 School of Material Science and Engineering, Chang’an University, Xi’an 710064
Abstract: This work aimed to explore the skeleton characteristics of thin-layer asphalt mixture and to ensure the aggregate gradation stability of UTL-10. We introduced 7.5 mm sieve between 4.75 mm and 9.5 mm sieves, and carried out the dry-rodded test so as to analyze the voids in coarse aggregates (VCA) under different coarse aggregate contents. Meanwhile, we conducted uniaxial penetration test upon the coarse aggregate-asphalt mortar specimens, and thus the parameters related to shear strength of different coarse aggregate proportions were obtained. Consequently the indexes for the proportion control of coarse aggregate in ultra-thin asphalt mixture were determined, and the recommended ranges of coarse aggregates content were presented as well. The results indicated that the internal friction angle φ of coarse aggregate can be used to reflect the skeleton strength stability of coarse aggregate gradation. Meanwhile, by the combination of VCA and internal friction angle φ, the coarse aggregate proportion design of ultra-thin asphalt mixture can be effectively controlled. The UTL-13 recommended contents of the three coarse aggregate are 12.5%—22.2%,37.5%—44.4% and 33.3%—50%, respectively. And the UTL-10 recommended contents of the three coarse aggregate are 10%—16.7%,40%—50% and 33.3%—50% respectively.
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