Molten lava is melted rock. Therefore, it cannot be stopped by concrete barriers. The lava, still in hot liquid form, detroys and melts anything in its path, including cement.
Concrete is actually harder than most types of rock found in nature. Plus, like a piece of wood placed on a fire, it would take a while for the concrete to melt.
Lava is molten rock. By the time it gets to the barriers, it has flowed quite a ways, and for a while. The earth, and air would cool the lava over time, so when the lava reaches the barriers, it probably can no longer melt rock, although still being deadly to people. (And even if it WAS hot enough when it reached the barriers-- it would have taken a while to melt through them completely.
Other than the air and ground cooling the lava as mentioned in the comment above, you also need to remember that they were also spraying water on the lava, and that would definitely cool it down.
I'm a geology student and I've covered volcanos and their related hazards on my course. The concrete will stop the lava, so long as they pump water at it like they did in the film. And like others have responded with, the air will have cooled it.
Yep easily blow that theory becuase it if were true it would have already melted its way back down into the ground and never been down the street anyway. ice bergs float around in water all the time dont they ;)
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