A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Use of Four-Point Bending Notched Beam Fatigue Tests to Rank Crack-Mitigating Interlayers
The laboratory characterization of reflective crack-mitigating interlayer systems has been challenging due to the difficulty in establishing loading conditions that can simulate field behavior. Due to their widespread use in characterizing the fatigue resistance of single-layered asphalt concrete (AC) specimens, four-point beam fatigue tests are considered to be possible index tests for evaluating the behavior of various systems. However, the boundary conditions of the beam fatigue test and the criteria used to determine failure of the system with interlayers must be taken into account or else the results can be misleading. In this study, notched layered AC beams with various interlayer systems were subjected to four-point bending fatigue tests. The interlayer systems included three geosynthetics (two paving mats and one paving fabric), a chip seal layer, and a tack coat-only sample. Digital Image Correlation (DIC) was used to monitor deformation and crack propagation within these beams, and the results from the DIC analysis were compared with traditional beam fatigue failure criteria to evaluate their ability to rank the relative performance of the samples. This study found that commonly used beam fatigue failure criteria are inadequate measures of performance for layered beam tests, as they are incapable of quantifying all of the damage mechanisms that occur within layered samples, and that rankings obtained using these criteria can be misleading. Future research is needed to develop improved failure criteria and a better understanding of the correlation between the behavior of the interlayer systems tested in the four-point bending test and behavior in the field.
The Use of Four-Point Bending Notched Beam Fatigue Tests to Rank Crack-Mitigating Interlayers
The laboratory characterization of reflective crack-mitigating interlayer systems has been challenging due to the difficulty in establishing loading conditions that can simulate field behavior. Due to their widespread use in characterizing the fatigue resistance of single-layered asphalt concrete (AC) specimens, four-point beam fatigue tests are considered to be possible index tests for evaluating the behavior of various systems. However, the boundary conditions of the beam fatigue test and the criteria used to determine failure of the system with interlayers must be taken into account or else the results can be misleading. In this study, notched layered AC beams with various interlayer systems were subjected to four-point bending fatigue tests. The interlayer systems included three geosynthetics (two paving mats and one paving fabric), a chip seal layer, and a tack coat-only sample. Digital Image Correlation (DIC) was used to monitor deformation and crack propagation within these beams, and the results from the DIC analysis were compared with traditional beam fatigue failure criteria to evaluate their ability to rank the relative performance of the samples. This study found that commonly used beam fatigue failure criteria are inadequate measures of performance for layered beam tests, as they are incapable of quantifying all of the damage mechanisms that occur within layered samples, and that rankings obtained using these criteria can be misleading. Future research is needed to develop improved failure criteria and a better understanding of the correlation between the behavior of the interlayer systems tested in the four-point bending test and behavior in the field.
The Use of Four-Point Bending Notched Beam Fatigue Tests to Rank Crack-Mitigating Interlayers
RILEM Bookseries
Canestrari, Francesco (editor) / Partl, Manfred N. (editor) / Wargo, Andrew D. (author) / Safavizadeh, Shayan (author) / Kim, Richard Y. (author)
2015-08-30
12 pages
Article/Chapter (Book)
Electronic Resource
English
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