At what temperature does pavement liquefy?

Question

I heard that road crews in France had to put gravel on liquefying roadways due to high temperatures.

Answer 1

10,867,635,23 degrees

Answer 2

Any pavement containing tar (like asphalt) will begin to significantly soften at temperatures as low as 150 degrees or so. Asphalt can get this hot easily on a sunny day, especially on a large paved area, like an airport or a parking lot. Concrete though, which is mostly limestone, would have to be extremely hot to begin liquifying- hotter than any temperature you'll ever experience- many thousands of degrees.

Answer 3

Well, it depends on what your "pavement" is made of... if it's cement, I think the limestone will actually melt first, at around 825C before the clay portion does (hey, they make kilns out of clay, so good luck melting it with anything other than a mag-induction blast oven or some sort of laser) If you've just got an asphalt sidewalk, it will melt at a much lower temperature (hot mix asphalt is usually mixed at 160C and compacted at 140C), and since it's black, it absorbs a lot of heat on a sunny day, which is why on really hot days, the asphalt can actually melt around the tires of cars parked atop it. That's probably what they surfaced the road with in that French story.

Answer 4

I assume you mean "asphalt concrete" or blacktop, but most people just call it asphalt. But asphalt, or bitumen, makes up only 5% of the mixture. The rest is sand and gravel (aggregate). So the pavement can't really liquify, given the high solids content of it, but it can get very, very soft. The "hot mix" that road crews spread and then roll is made at about 300F and spread at around 150 to 200F. The asphalt itself comes from crude oil, and is the stuff left behind after everything else with a boiling point below 500C has been separated out.

Answer 5

I lay asphalt in Oklahoma and have done so for 10 years. I have never heard of it liquifying?? We have been at 115 degrees with the heat index for the past week now. The sun/heat will "heat" the asphalt up and the roller marks will be taken out if its a heavily used road. We are only ALLOWED to compact it to a certain degree depending on the standards of the job. As far as using a spoon?? U have some really bad asphalt!! It was not laid properly with the tack. If the road gets petrimat on HOT AND HUMID DAYS then sand should be spread out across it. That will alleviate the petrimat from coming up on vehicle tires. Hope this helped??

Answer 6

I have no idea... but when I was younger I remember the asphalt in the street getting so hot that I could easily dig it up with a spoon. That was the middle of summer in southern California... must have been about 100 degrees.

Maybe the roadways in France are made of a softer substance than the asphalt or pavement here in the US.

Answer 7

Asphalt Melting Point

Answer 8

they're talking about asphalt. asphalt doesn't really liquify, it just turns into a softer form. they're adding gravel to make sure that the cars dont sink into the ground. if you've ever seen those large machines laying down new road, then you'll know what i mean. the tar in the asphalt turns really gooey at about 200 to 300 degrees.

Answer 9

Pavement is hard and Madonna makes me like pavement.

Answer 10

Pavement as in concrete? VERY HIGH TEMPS.

Now if it was blacktop then I could see that melting yess. -- But not sure what temps.

Answer 11

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because the boiling point is so low. even with pressure the atoms are moving too fast to change it into liquid