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Are there any good alternatives to concrete/asphalt
(lemmy.world)
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this post was submitted on 30 Jan 2024
105 points (96.5% liked)
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If you want to do some reading, google the Minnesota Department of Transportation - MnDOT - is known nationally and internationally for it's testing of materials and construction of roads over a long term. There are some test sections dating back to 1973 that are still being monitored and studied. What make MnDOT studies valuable to other states, (and even other countries), is the wide temperature swings in the state. Temperatures can swing from -40F to over 100F in the course of one year.
A simplistic view - What damages road surfaces that happen over the winter and spring is the tiny cracks that are cause by the thermal expansion and contraction of the road surface that traps moisture which then repeatedly freezes and thaws. Freezing water expands creating a bit larger crack which traps more moisture - wash rinse and repeat over time and the surface flakes away causing potholes and broken roads. Add in the flexing of the road with heavy traffic, and roads will tend to break up and become rough. But there a a bunch of other considerations from subsurface prep to the general geology of where you want to build your road that all add to the life expectancy of the road itself.
Very generally, for heavy high speed traffic all weather roads, concrete roads seem to be gaining favor as the mixes get better additives.