Keywords
fisuras
ensayo de overlay
fatiga
Fatigue Cracking
Cracks
Overlay Test
How to Cite
Abstract
The crack resistance should be an issue to take into account in the performance of the asphalt mixture, which has to resist permanent deformation, fatigue and moisture damage. Cracks appear in flexible pavements through two failure mechanisms: reflective cracking and fatigue.
The reflective cracking is a type of failure that has received less attention than fatigue cracking. This form of distress should be consider when selecting the asphalt mixture as overlay, to be placed on rigid pavements stabilized bases or simply when the existing layer is very cracked. It is well known that existing cracks propagate to the top layer causing the water to infiltrate causing the rapid deterioration of the pavement structure.
This article focuses on the implementation of the overlay test, which is a very practical method which gives enough information about the characteristic cracking of asphalt mixtures, from the beginning of the crack until its propagation behavior, it´s also sensitive enough to measure the changes in the type and asphalt content to discriminate between various types of asphalt mixtures.
References
Tex-248-F (2009). Overlay Test. Accesado en setiembre de 2012. http://www.google.co.cr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CDUQFjAB&url=http%3A%2F%2Fftp.dot.state.tx.us%2Fpub%2Ftxdot-info%2Fcst%2FTMS%2F200-F_series%2Fpdfs%2Fbit248.pdf&ei=K1sJUqLwM9XA4APGloDwBw&usg=AFQjCNHebjNf49QJlgo7JbQ_LJzP8Q1eSw&sig2=KQ_Jc_Gyp3v3vycsr9yQFw&bvm=bv.50500085,d.dmg
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