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Title:

Effect of Asphalt Mixture Type on Interlayer Shear Properties

Accession Number:

01629827

Record Type:

Component

Abstract:

This study compares the interlayer shear properties of pavement layers composed of different asphalt mixture types. Two dense asphalt mixtures (D, BM) and one open-graded friction course (OGFC) mixture were selected for the comparison. The direct shear test was conducted with and without normal stress to assess the shear strength and shear stiffness at different tack coat application rates. Results show that the friction angle between BM aggregate and OGFC aggregate was larger than the angle between D aggregate and OGFC aggregate. At 0.2 MPa normal stress, the specimens of two dense mixtures gave higher shear properties than those with OGFC as the upper layer. This is due to the fact that the non-contact area between OGFC and underlying layer compromised the bonding between the two layers. Among the samples of two dense layers, the D-BM specimens showed a higher interlayer shear resistance resulting from a larger interlayer roughness caused by a better aggregate interlock between D and BM mixtures. This indicates an upper layer with a small nominal maximum aggregate size (NMAS) and an underlying layer with a large NMAS could provide a better bonding. For specimens of OGFC and a dense mixture (D or BM), OGFC-BM showed a better shear performance at the optimal tack coat application rate than OGFC-D, which is due to the double effects of a larger interface contact area and a larger interface roughness than OGFC-D.

Supplemental Notes:

This paper was sponsored by TRB committee AFK40 Standing Committee on Surface Requirements of Asphalt Mixtures.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-05859

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Song, Weimin
Shu, Xiang
Huang, Baoshan
Woods, Mark

Pagination:

14p

Publication Date:

2017

Conference:

Transportation Research Board 96th Annual Meeting

Location: Washington DC, United States
Date: 2017-1-8 to 2017-1-12
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-05859

Files:

TRIS, TRB, ATRI

Created Date:

Dec 8 2016 12:21PM