Les exposés écrits du congrès ont été publiés dans la langue dans laquelle ils ont été soumis à l’ATC.
This paper presents a case study on the implementation and performance of concrete roundabouts in Essex County, southern Ontario. The introduction discusses why municipalities are increasingly choosing roundabouts, outlining their key features, benefits, and potential challenges. It also references the TAC Canadian Roundabout Design Guide, emphasizing its importance in the design process.
The background section covers the fundamental components of concrete pavements, the jointing methods used in concrete roundabouts, and the design considerations for determining roundabout thickness. Design specifics will be given for two roundabouts: one built in 2014 at County Road 22 and County Road 2 in the Municipality of Lakeshore, and the other, more recently constructed in 2024, at County Road 42 and County Road 43 in the Town of Tecumseh.
The construction of the 2024 roundabout at County Road 42 and County Road 43 is reviewed, including subgrade, subbase, and base preparation, as well as the installation of dowels, tie bars, and the concrete placement process. Jointing and pavement marking methods are also discussed.
The paper will then evaluate the performance of the 2014 concrete roundabout, focusing on the durability of the specially etched pavement markings. It will also compare the performance of asphalt roundabouts in Essex County, highlighting the benefits of transitioning to concrete roundabouts.
In conclusion, the paper highlights the sustainability benefits of concrete roundabouts, such as improved light reflectance, reduced hydroplaning risks, material recyclability, and the use of Portland Limestone cement and industrial by-products in the concrete mix. It will also present a comparison of the carbon footprint between the 2014 concrete roundabout using general-use (GU) cement and the 2024 roundabout using general-use limestone cement (GUL).