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JEAN MOOR/FACEBOOK — Extreme heat experienced in Winnipeg in the summer of 2024 caused several roads in the city and outside it to buckle as concrete expanded.
The once gradual march forward in global temperatures seen in fractions of a degree is no longer a measuring stick for designing as severe temperatures hit and occur more often.Dr. Amit Bhasin, from the University of Texas’s Centre for Transportation Research, agrees design codes are failing because they are based on historical data and the challenge is looking forward in a fluid or changing environment that considers meeting or not meeting climate change objectives or partially meeting them.
Muench said every community will have to assess and determine changes and at what price point. Bridges are also subject to concrete expansion.Manitoba and Ontario have both seen concrete roads buckle this past summer. Winnipeg saw two instances of concrete road buckling, while the Manitoba Ministry of Transportation also repaired buckling on concrete roads outside the city. Ontario was also hit when the County of Essex closed a road after buckling occurred.
“We’re developing new standardized specifications to include expansion joints specifically for sidewalks, as these structures are more susceptible to temperature-related stress due to their thinner concrete layer. The thinner sections are more vulnerable to differential temperatures, making expansion joint placement essential to prevent cracking and up-heaving under high heat conditions,” she said.
“These include, but are not limited to, the use of better-quality aggregates in the concrete mixes, improved concrete mixes and joint details, the use of better-quality base and sub-base materials to provide stronger support and improved drainability for concrete pavements.”B.C. does not use concrete for paving but on sidewalks, road islands and on bridges.
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