Design of flexible pavement based on asphalt visco-elasitc properties

Rita Kleizienė

Doctoral dissertation

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Flexible pavement is a structure composed of one or more asphalt layers laid on compacted bound and unbound base layers. Even though every layer of pavement is important and affects exploitation, the asphalt surface has the most influence on pavement performance. Asphalt layers are compacted special composition aggregate mixtures bound with bitumen (asphalt binder). Bitumen properties, as well as asphalt mixture properties, vary depending on temperature and loading conditions. These variations influence entire pavement bearing capacity. The visco-elastic properties of asphalt mixtures, as well as their ranges, have to be evaluated in pavement design. This has to be done by determining the proper pavement layers thicknesses and selecting structure materials according to their influence on other layers and entire pavement performance.

Dissertation analyses the influence of the dynamic cyclic load on visco-elastic properties of asphalt mixture, bitumen binder, as well as pavement structure performance under different temperature conditions. The visco-elastic properties deter-mined for new and aged asphalt mixtures, the latter were cored from pavement exploited since 2007. Two determination methods of the dynamic modulus of asphalt mixtures where analysed: performing the dynamic indirect tension test and estimating from a theoretical model. The dynamic modulus of asphalt mixtures and dynamic shear modulus of bitumen were tested under linear visco-elastic range at different load frequencies and temperatures. The research results include development of a flexible pavement performance algorithm and specification of input data.

The dissertation consists of an introduction, three chapters, a summary in English, and seven annexes. Chapter 1 contains a review of pavement design methods in Lithuania and other countries as well as input data needs. Pavement layer elastic and visco-elastic mechanical property determination method research works are analysed. Chapter 2 subjected the experimental research and applied methods of asphalt mixtures and their components to data interpretation and analysis. The Hirsch model application for dynamic modulus estimation of asphalt mixtures was investigated and calibrated. The input data for visco-elastic pavement response and performance analysis were systemized and prepared for advanced pavement design application. Chapter 3 determines flexible pavement response and performance un-der static and moving load modelling applying elastic and visco-elastic properties of asphalt mixtures. The economical evaluation was calculated comparing different pavement design methods and pavement structure optimization.

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DOI: https://doi.org/10.20334/2392-M

Book details

Data sheet

Year:
2016
ISBN:
978-609-457-970-7
Imprint No:
2392-M
Dimensions:
145×205 mm
Pages:
178 p.
Cover:
Softcover
Language:
Lithuanian
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