Posted on 06/07/2011 12:30:26 PM PDT by WOBBLY BOB
St. Paul, Minn. — The Minnesota Department of Transportation is warning motorists to watch out for roads that might buckle without warning.
MnDOT spokesman Kent Barnard said the heat and humidity had caused pavement to heave on some Twin Cities metro highways.
Monday afternoon lanes were closed in I-94 in Minneapolis and St. Paul. Barnard said heat damaged roads in more than 20 places.
Barnard said he has not heard of accidents associated with buckling pavement. But he'd heard reports of damage to cars.
Older concrete highways are more prone to heave up, as debris fills the cracks between the panels, leaving no place for the pavement to expand.
(Excerpt) Read more at minnesota.publicradio.org ...
And if it were invented this afternoon; it would be a far cry more expensive than a bucket of asphalt!!
think they are trying to help Romney?
highs suppose only in 60’s thrusday
Come to the west side of Washington. 10 months of rain, two months of summer. Three to four weeks ( Maybe) of hot weather and lots and lots of liberals sipping lattes.
Yep, in Northern CA are temps hit highs of 106-110 for most of August every year but no buckling that I know of. Sounds like shoddy construction to me. Plus, paved roads have been in existence for about 100 years and they are just now having problems?
nice...
good day to be at Madeline Island.
We have a lot of trouble with potholes and frost heaves here in Vermont. It’s the freezing and thawing that does it.
Concrete roads proved to be a mistake in the northern states, at least here in New England. When Eisenhower put in the interstates, they were mostly done in concrete, and that proved to be a mistake. First they tried resurfacing with asphalt, and eventually they replaced most of them entirely with asphalt, because they just kept buckling. They left expansion cracks between the slabs, but that just didn’t work.
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As I pointed out, our area has experienced around a 140F differential. Also have a number of concrete freeways and buckling is unheard of. My conclusion is that MN roadway engineering is deficient, to include bridges.
High-tech concrete technology has a famous past
Almost 1,900 years ago, the Romans built what continues to be the world’s largest unreinforced solid concrete dome in the world—the Pantheon. The secret, probably unknown to the Emperor Hadrian’s engineers at the time, was that the lightweight concrete used to build the dome had set and hardened from the inside out. This internal curing process enhanced the material’s strength, durability, resistance to cracking, and other properties so that the Pantheon continues to be used for special events to this day.
http://www.freerepublic.com/focus/f-chat/2690198/posts
we should have hired non-union Romans.
In a bipartisan letter to President Obama, Senator Conrad and 43 senators said a swiftly finalizing appropriate regulations for coal ash provides the "best solution for the environment and for the economy."
The senators said the environmental advantages of the beneficial use of coal ash in products such as concrete and road base are well-established. They noted coal ash makes concrete stronger and cuts down on the production of more energy-consuming cements. A 2010 study by the University of Wisconsin and the Electric Power Research Institute found the beneficial use of coal ash reduced annual greenhouse gas emissions by an equivalent of 11 million tons of carbon dioxide, annual energy consumption by 162 trillion British thermal units, and annual water usage by 32 billion gallons.
Senator Conrad also highlighted the fact that an EPA hazardous waste designation would "overwhelm existing hazardous waste disposal capacity" and strain critical budget and staff resources.
http://politicalnews.me/?id=7691&keys=COAL-ASH-EPA-NONHAZARD
???
The only way this would matter is if the asphalt was laid during the dead of winter or if it somehow gains asphalt 'volume' when it contracts.
If it were laid in the spring or summer, then the amount of expansion during the heat of the summer months would be minimal.
Since asphalt is not a living, breathing entity, no new asphalt 'cells' are added when it contracts. So, it's the same amount of asphalt during the entire 12 months of a year.
Good points.
The other thing is sunshine.
You can easily have asphalt 40F above ambient if the solar load is right.
There are two seasons in Minnesota.
Winter and road repair.
But, given the differences in latitude, there will always be less sunlight striking the northern states than there is in Death Valley or Arizona at any time of year.
So, the temperature of the asphalt in the lower latitudes will actually be higher than it would in the higher ones.
True. The Romans also invented the water mill, although they never made widespread use of it because they had slaves to do the heavy work.
So it wasn’t really developed until the middle ages, mostly in monasteries. That was the basis of industrial and technological development for more than a thousand years, until it was finally replaced by the steam engine.
This is one if the reasons why I have advocated a transition to rubber roads and asphalt tires for so many years.
Well, one person stated it was because of the wide temperature variations. I’m not quite sure I can buy into that. Let’s recall that on some days, the temperature can change as much as 50 degrees. If my memory is accurate, I’ve actually heard of a few rare cases where the temperature change much more than that without widespread road problems.
The omissions were rather glaring huh.
Thanks for the response.
No, but that’s an interesting way of asking?
I’m interested to know the reason for placing the same spelling of Zathras in there three times.
Am I missing an inside joke or something else?
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