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Fiber-modified asphalt overlays



Title: Fiber-modified asphalt overlays
Author(s): J.P. Serfass, B. Mahe de a Villegle
Paper category : conference
Book title: Fourth International RILEM Conference on Reflective Cracking in Pavements - Research in Practice
Editor(s): A. O. Abd El Halim, D. A. Taylor
and El H. H. Mohamed
Print-ISBN: 2-912143-14-4
e-ISBN: 2351580265
Publisher: RILEM Publications SARL
Publication year: 2000
Pages: 227 - 239
Total Pages: 13
Nb references: 5
Language: English


Abstract: 
The addition of fibers into asphalt mixes has two main effects, both of which improve cracking resistance. The first of these effects is increased binder content, due to the capacity of the fibers to hold large quantities of bitumen. The second is higher shear resistance, resulting from the reinforcement provided by the fibers. Fiber-modified asphalt concrete, used as a thin wearing course, has proved to retard reflective cracking. Another application of this technique is fiberized sand-asphalt, which is used as a stress-absorbing interlayer. Two-layered overlays, incorporating one or two types of fiber-modified mix, have also been developed. One of these composite overlays combines a thin lift of fiber-modified asphalt concrete, acting a stress relieving interlayer, and a thin wearing course, designed for high skid resistance. Another type, seen as the most effective in terms of crack prevention, consists of two layers of fiberized asphalt: the lower being a high binder content sand-asphalt and the wearing course a fiber-modified gap-graded, dense mix. The laboratory characteristics of these materials are presented and discussed. This includes the evaluation of the resistance to cracking of specimens of single or double-layered systems, subjected to simultaneous dynamic bending and gradual crack opening. Finally, the in-place behaviour of the different types of overlay has been monitored for a number of years. Relationships between laboratory and in situ performance have been established, facilitating the selection of the most appropriate overlay for a given case.


Online publication: 2009-12-23
Publication type : full_text
Public price (Euros): 0.00