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Long term effect of modified binder on cracking resistance of pavements

Title: Long term effect of modified binder on cracking resistance of pavements
Author(s): A.G. Dumont, M. Ould-Henia
Paper category : conference
Book title: Fifth International RILEM Conference on Reflective Cracking in Pavements
Editor(s): C. Petit, I.L. Al-Qadi and A. Millien
Print-ISBN: 2-912143-47-0
e-ISBN: 2912143764
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 511 - 518
Total Pages: 8
Nb references: 7
Language: English

Abstract: Combined loading and climatic effects have required the selection of high modulus bituminous mixtures to prevent pavement rutting but have increased the pavement crack potential. In 1989, it was decided to initiate a long-term assessment of a wide range of new modified binders. Pavement cracking, rutting and ravelling were monitored regularly over 14 years of pavement service. 16 test sections, each 300 meters, were constructed. The structures of all those test sections were identical, except the wearing course binder. 12 modified binders and 4 pure bitumen as reference, were evaluated.A new assessment method of in situ cracking is proposed which consider the severity and the extent separately in order to get a cracking amplitude parameter. Distinction has been made between the initiation and the propagation of cracking.In general, PmBs show some improvement of the performance of the wearing course compared to conventional binders. However, one section with straight run bitumen performs as well as some PmBs. Cracking resistance for one section with SBS modified bitumen was very significant.It was found that classical laboratory testing results failed to predict field performance. Thorough studies were carried out on the TSRST and the BBR tests.

Online publication: 2004-04-15
Publication type : full_text
Public price (Euros): 0.00

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