Test Method for Determining the Permanent Shear Strain and Complex Shear Modulus of Asphalt Mixtures Using the Superpave Shear Tester (SST)

10.1520/d7312 ◽  
2019 ◽  
Author(s):  
Keyword(s):  
Shear Modulus ◽  
Shear Strain ◽  
Asphalt Mixtures ◽  
Test Method ◽  
Complex Shear Modulus ◽  
Complex Shear ◽  
Shear Tester

scholarly journals Homogeneity and Viscoelastic Behaviour of Bitumen Film in Asphalt Mixtures Containing RAP

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4355
Author(s):  
Adam Liphardt ◽  
Piotr Radziszewski ◽  
Jan Król
Keyword(s):  
Shear Modulus ◽  
Creep Compliance ◽  
Elastic Recovery ◽  
Asphalt Mixtures ◽  
Test Results ◽  
Complex Shear Modulus ◽  
Film Properties ◽  
Complex Shear ◽  
Bituminous Binders ◽  
The Impact

This article discusses the phenomenon of fresh and RAP binders miscibility and presents test results of bitumen film properties from specially prepared asphalt mixtures. The miscibility of a fresh binder and a RAP binder still has not been fully recognised. The aim of this study was to determine the homogeneity level of the bitumen film based on viscoelastic assessment. In addition, an attempt was made to assess the impact of fresh binder on the binders blending degree. The study included assessment of homogeneity of bitumen film comprising various types of bituminous binders. The assessment was conducted on the basis of tests in the dynamic shear rheometer regarding rheological properties of the binders recovered from specific layers of the bitumen film using a staged extraction method. A complex shear modulus as a function of temperature, an elastic recovery R and a non-recoverable creep compliance modulus JNR from MSCR test were determined. The conducted statistical analyses confirmed the significant impact of the type of fresh binder on the blending degree. Regressive dependencies have been set between the differences of the complex shear modulus of the binders subject to mixing and differences of the complex shear modulus of binders from the internal and external layer of the bitumen film comprised of those binders. It was found that there is no full blending of fresh hard bitumen-simulated binder from RAP, which results in non-homogeneity of the bitumen film.

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