Interlayer Shear Testing under Combined State of Stress

Abstract:

This research aims to investigate the influence of the normal load on the shear behavior of double-layer asphalt specimens. The LCB shear test device proposed by Miro has been chosen as model for the design and the development of two new shear tests in the laboratories of the Sapienza University of Rome; under both shear tests, it possible to apply a normal load so as to reproduce the composed state of stress carried out by the vehicular loading. Several compression levels are investigated, paying attention especially to the load application modes and to the effect of the normal stress on the interlocking properties. The study parameters chosen for the analysis are the maximum shear stress and the slope of the final branch of the response curve or the residual shear stress, in relation to the failure behavior due to the devices. The results of tests performed on the first machine, when the normal load is applied, show a direct proportionality with the normal load and the slope of the response curves after the peak remain constant because it is related to the friction features. With the second machine, which was adjusted to evaluate the shear behaviour for high interface displacements, the peak shear stress and the residual one were also evaluated, showing the increasing in relation to the compression applied during the test. The two machines provide different but comparable results.

• Periodical: Advanced Materials Research (Volume 723)
• Pages: 381-388
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.723.381
• Online since: August 2013
• Authors: Antonio D'Andrea, Simone Russo, Cristina Tozzo
• Keywords: Composed State of Stress, Interface Shear Strength, Normal Load, Shear Testing Machine

References

[1] Collop, A., Thom, N., Sangiorgi, C. (2003). Assessment of Bond Condition Using the Leutner Shear Test, ICE J. Transp., Vol. 156, No. 4, p.pp.211-217.

DOI: 10.1680/tran.2003.156.4.211

[2] West, R., Moore, J., and Zhang, J. (2005). Evaluation of Bond Strength Between Pavement Layers. NCAT Report 05-08, National Center for Asphalt Technology,Auburn, Alabama.

[3] Leng Z., Ozer H., Al-Qadi I., and Carpenter S. (2008). Interface Bonding Between Hot-Mix Asphalt and Various Portland Cement Concrete Surfaces, Transportation Research Record: Journal of the Transportation Research Board, No. 2057, Transportation Research Board of the National Academies, Washington, D.C., 2008, p.46–53.

DOI: 10.3141/2057-06

[4] Mohammad, L. N., Raqib, M. A., and Huang, B. (2002). Influence of Asphalt Tack Coat Materials on Interface Shear Strength, In Transportation Research Record: Journal of the Transportation Research Board, No. 1789, TRB, National Research Council, Washington, D.C., pp.56-65.

DOI: 10.3141/1789-06

[5] Canestrari F., Ferrotti G., Partl M., and Santagata E. (2005). Advanced Testing and Characterizationof Interlayer Shear Resistance, Transportation Research Record: Journal of the Transportation Research Board, No. 1929, Transportation Research Board of the National Academies, Washington, D.C., 2005, p.69–78.

DOI: 10.3141/1929-09

[6] Chen J. and Huang C. (2010). Effect of Surface Characteristics on Bonding Properties of Bituminous Tack Coat, Transportation Research Record: Journal of the Transportation Research Board, No. 2180, Transportation Research Board of the National Academies, Washington, D.C., 2010, p.142–149.

DOI: 10.3141/2180-16

[7] Wheat M.(2007). Evalutation Of Bond Strength At Asphalt Interfaces, Report of Department of Civil Engineering College of Engineering Kansas State University Manhattan

[8] Miró R., Martínez A., Pérez F. (2005). Evaluation Of The Effect Of Heat-Adhesive Emulsions For Tack Coats With Shear Test From The Road Research Laboratory Of Barcelona, 2006 Annual Meeting of the Transportation Research Board

DOI: 10.1177/0361198106197000106