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Means to reduce development of reflected cracks in asphalt concrete pavements



Title: Means to reduce development of reflected cracks in asphalt concrete pavements
Author(s): L.V. Pozdnjaeva, V.A. Kretov, M.B. Levitscki
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: 217 - 225
Total Pages: 9
Nb references: 3
Language: English


Abstract: 
One of the means known to prevent development of reflected cracks is to build crack-resistant asphalt concrete pavements. This problem has been especially real in Russia, since lately asphalt and cement concrete pavements have been repaired mostly by means of overlaying them with new asphalt concrete layers. Since there is a good deal of cracks in existing asphalt concrete pavements, joints to be added in case of cement concrete pavements, it is particularly important for newly built upper pavement layers to be increasingly resistant to the development of reflected cracks. In this connection, it is particularly important for asphalt concrete pavements that such materials be used that promote lower crack development rates. Among these materials there are modifiers whose synthetic resin and granulated synthetic rubber varieties were considered. Asphalt concrete mixes were formed using these materials on the basis of both modified bitumen varieties and granulated rubber added to mineral materials. It is significant that lowering of reflected crack development rates by means of modified bitumen varieties and by means of granulated rubber added to mineral materials differs basically. Special asphalt concrete laboratory tests carried out with the FR-2 instrument make it possible to fix their fatigue longevity, that is their capability to support cyclic loads before cracks begin to get formed till they are crushed at temperatures of 0 and 20 degree C under varied loading peak values. As evident from the tests, most fatigue-resistant are asphalt concrete varieties for which resin-modified bitumen and granulated rubber added to mineral materials were used. Road construction experience has corroborated results obtained by the studies. Hundred kilometers synthetic resin-added asphalt concrete pavements highly resistant to the development of reflected cracks have been built. First experimental lengths on granulated rubber additives have been built, their first-year operation proving that this modifier also successfully promotes decreasing reflected crack development rates.


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