Bitumen Selection Approach Assessing Its Resistance to Low Temperature Cracking

4th International Conference on Road and Rail Infrastructure (CETRA 2016)

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Title Bitumen Selection Approach Assessing Its Resistance to Low Temperature Cracking
 
Creator Judita Gražulytė; Road Research Institute of Vilnius Gediminas Technical University
Audrius Vaitkus; Road Research Institute of Vilnius Gediminas Technical University
Igoris Kravcovas; Road Research Institute of Vilnius Gediminas Technical University
 
Subject bitumen; thermal cracking; low temperature cracking; bending beam rheometer (BBR); critical temperature; performance grade
 
Description Low temperature cracking or thermal cracking is one of the most important distress in asphalt pavements located in cold regions. The development of it results in higher pavement roughness, faster pavement deterioration and requires millions of euros of repair and maintenance annually. The proper bitumen selection for asphalt mixture production restricts the formation of low temperature cracking. However, most designers do not consider bitumen susceptibility to low temperature cracking, because it needs to carry out additional laboratory tests and it requires supplementary cost and time in asphalt mixture selection. Consequently, this paper is focused on approach how to select bitumen assessing its resistance to low temperature cracking in easy and fast way. First, 11 bitumens of which 6 bitumens were polymer modified bitumens, were investigated. The critical temperature of bitumen, below which low temperature cracking occurs in the pavement, was calculated based on bending beam rheometer (BBR) experimental data by American Association of State and Highway Transportation (AASHTO) specifications. The performance grades (PG) low limits of bitumens were also determined using 3 °C step. The performance grade low limit varied from -16 °C up to -28 °C. Four polymer modified bitumens were not prone to low temperature cracking even at -28 °C temperature. Second, Lithuania was divided into 3 zones according to minimum pavement temperature. It gave possibility for designers to choose bitumen assessing its resistance to low temperature cracking based on road location. The implementation of this procedure will restrict low temperature cracking in asphalt pavements and will result in significant lower maintenance cost.
 
Publisher CETRA 2016
 
Contributor
 
Date 2017-02-28 15:10:34
 
Type Peer-reviewed Paper
 
Identifier http://master.grad.hr/cetra/ocs/index.php/cetra4/cetra2016/paper/view/467
 
Source CETRA 2016; 4th International Conference on Road and Rail Infrastructure
 
Language en
 
Rights Authors who submit to this conference agree to the following terms:<br /> <strong>a)</strong> Authors retain copyright over their work, while allowing the conference to place this unpublished work under a <a href="http://creativecommons.org/licenses/by/3.0/">Creative Commons Attribution License</a>, which allows others to freely access, use, and share the work, with an acknowledgement of the work's authorship and its initial presentation at this conference. <br /> <strong>b)</strong> Submitted full papers will be published in the book of proceedings "Road and Rail Infrastructure IV" as well as in digital form (on a CD). Conference organiser is allowed to publish author's names, institution and country as well as the paper abstract on the conference web site.
 

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