LEI S Y, HUI H Q.Theoretical research and experimental verification of the strength of fiber asphalt mixture[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(5):174-179.

doi:10.16186/j.cnki.1673-9787.2020100029

Received:2020/10/14

Revised:2021/01/13

Published:2022/09/25

Theoretical research and experimental verification of the strength of 

fiber asphalt mixture

LEI Shengyou1, HUI Huiqing2

1.School of Highway，Chang’an University，Xi’an 710064，Shannxi，China；2.School of Science，Chang’an University，Xi’an 710064，Shannxi，China

Abstract:In order to further reveal the role of fibers in fiber asphalt mixtures，in the strength analysis of fiber asphalt mixtures，the effect of fibers was equated as a constraint，that was，additional small principal stress，in the strength analysis of fiber-asphalt mixtures，and that the strength index of fiber asphalt mixtures were considered as higher than those of asphalt mixtures.According to the relationship of Mohr’s circle of stress between the fiber asphalt mixture and the asphalt mixture，the expression of the major stress of the fiber asphalt mixture in the limit equilibrium state was derived，and the formula was discussed and analyzed in detail.The expression of the strength of fiber asphalt mixture in many situations has been evolved.Finally，through the triaxial shear test and splitting tests of multiple groups of fiber-asphalt mixtures，it was verified that the strength formula proposed in this paper was reasonable.In addition，by adjusting and changing the parameters in the strength formula，the formula could also be used for nonlinear analysis of the strength of fiber-asphalt mixtures，and could also be used to predict the strength of new fiber-asphalt mixtures.The results of this paper had a guiding role for the strength analysis of dimensional asphalt mixtures containing various damage defects and other materials.

Key words:fiber;asphalt mixture;strength;additional minor principal stress;triaxial shear test;tensile test

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