细粒式薄表层沥青混合料中粗集料的骨架特性

doi:10.11896/cldb.201904010

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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.

Key words： road engineering thin-layer asphalt mixture coarse aggregate-asphalt mortar internal friction angle φ coarse aggregate content

Published: 11 March 2019

CLC number:	TB34
	U416.217

Fund:This work was financially supported by the National Natural Science Foundation of China (51578076).

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	Articles by authors
	LI Wei
	HAN Sen
	HUANG Qibo
	YAO Tengfei
	XU Ouming

Cite this article:

LI Wei,HAN Sen,HUANG Qibo, et al. The Skeleton Characteristics of Coarse Aggregates in Granular Thin-layer Asphalt Mixture[J]. Materials Reports, 2019, 33(4): 617-624.

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http://www.mater-rep.com/EN/10.11896/cldb.201904010 OR http://www.mater-rep.com/EN/Y2019/V33/I4/617

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