Evaluation of bond between pavement layers: fracture mechanics approach

Interface bonding;Fracture energy

Hakimzadeh Khoee, Salman

关键词: Interface bonding;    Fracture energy;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/78656/HAKIMZADEHKHOEE-DISSERTATION-2015.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Bonding between adjacent pavement layers is one of the most important factors affecting pavement service life. Poor bonding between adjacent layers of hot mix asphalt can lead to different types of distresses in pavement system such as slippage cracking, top-down cracking, premature fatigue cracking, and in some cases complete delamination. A considerable number of research projects have been conducted to examine interface bonding and many test methods have been proposed to evaluate the bonding between pavement layers.However, a review of the literature has shown that research on interface bonding using fundamental fracture mechanics has been very limited and is still in its early stage.Furthermore, laboratory tests and analyses that capture a broad range of fracture behavior, such as opening and shearing, have yet to be developed. The main objectives of this study were to investigate the capability of fracture mechanics approach for assessment of bonding between pavement layers and to identify performance-related tests that can be used to generate fundamental fracture data that can be readily utilized in computational models in order to facilitate system optimization and linkage between material properties and field performance. This dissertation describes the development, application, and validation of three new fracture energy based interface bond tests including the Interface Bond Test (IBT), Three-Point Bending Notched Beam Test, and Four-Point Shear Notched Beam Test that can be used for the characterization of interface behavior between adjacent pavement layers (HMA-HMA or HMA-PCC) under different modes of failure including Mode I (tensile Mode), Mode II (shear Mode), and Mixed-Mode (combination ofMode I and Mode II). The tests were evaluated in the context of laboratory and field samples produced with different interface treatments along with finite element simulations. The obtained results clearly demonstrate the ability of the newly developed tests to evaluate the quality of the bonding between pavement layers and to generate fundamental fracture data that can be used in computational models.