ROADEX II

HOME  |  ROADEX III  |  ROADEX II  |  ROADEX  |  PUBLICATIONS  |  NEWS

SEARCH

LATEST NEWS

13 August 2008 - After being hosted for a few months on a temporary web site the
e-learning package is now running directly from the ROADEX web site's server.

24 March 2008 - Final reports and videos published on this web site.

21 February 2008 - Steering Committee and potential new partners from Greenland, Russia and Ireland meet in Rovaniemi, Finland to prepare ideas for future ROADEX research.

31 December 2007 - NPP funding window closed.

NEWS ARCHIVE

CONTACT WEBMASTER

Email the Webmaster

Email for Information

Before sending your email replace -at- with @ in the recipient address.

Last update 30/05/2007

Task 2_1:- “Permanent deformation & freeze-thaw cycles”

 

Lead Contacts

Andrew Dawson, Nottingham University

Pauli Kolisoja, Tampere University of Technology

Objective

The goal for the Roadex II Phase 2.1 was to study the problem of rutting in low-volume thinly sealed or unsealed pavements and to propose improved ways of designing, assessing and maintaining these types of pavements.

Outputs

The report is laid out in eleven sections, but these fall into three parts.

The first part of the report gives an explanation of why rutting is undesirable and then describes the types and causes of distress seen in this kind of pavement. It explains the likely causes of the different types of rutting and aims to do so in a manner which can be readily understood without resort to advanced computational or theoretical background. Many illustrations are provided to assist with this explanation. This part also discusses the cause and distress associated with spring thaw weakening which is a major problem in many of the study areas.

The second part of the document reports on the results obtained from the programme of laboratory testing. This programme concentrated on repeated load triaxial testing of aggregates from Scotland, Norway and Finland. Several different test procedures were applied in order to assess the materials in a variety of ways and to provide data for the work described in next part of the report. The second part gives some interpretation of the data collected and also describes computational work which modelled pavement response using data from the laboratory testing programme.

The third part of the report provides a design and assessment strategy for implementation by road engineers. It lays out the steps to be taken to ensure that the pavement will not undergo undue rutting. A method is presented which uses readily available insitu testing devices and chart-based interpretation so that both the assessment and computations should be within the ability of hard-pressed local engineers with limited budgets.

Finally, some suggestions are made for further refinement and validation of the procedures proposed.

Links

Nottingham University
Tampere University of Technology

Acknowledgments

 


EVENTS