why concrete roads are always laid in blocks & gaps between the blocks are filled with tar?

Answer 1

expansion joints- so when the road freezes or gets hot- expands or shrinks- the road can heave and move without cracking and breaking the road itself

Answer 2

Concrete Road Blocks

Answer 3

Concrete is layed in blocks due to a thing called expansion and contraction. The tar seals the gap to prevent water from getting in between the concrete. This is particularly important when the temperature drops below freezing, as the water would expand when it froze and cause cracking in the concrete.

Answer 4

They are called "expansion joints". Concrete has to be poured in sections and because it's so rigid, there must be gaps between the slabs so that they have room to expand when heated. The tar is there to fill the expansion joints and keep them from filling with sand, which has no elasticity.

Answer 5

They are laid this way to prevent cracking .The tar acts as a cushion between the segments.During the day the concrete
actually expands as the air temperature rises,and conversly at night it contracts as it cools down.The gaps allow room for this process.Take a good look at freeway overpasses and you'll see these same gaps.

Answer 6

Generally, this is to allow for the expansion and contraction of the road by the heat and cold with the changes of the seasons. You will see a similar measure taken with bridges (the saw-tooth connections on the ends of the bridge). If this expansion and contraction did not have a "buffer zone" on the road, in hot weather the road would expand and then buckle because it doesn't have anywhere to which it can expand. Similarly, without these expansion and contraction zones, in cold weather the road would contract and split.

Answer 7

The tarred in gaps allow for expansion and retraction due to hot and cold respectively. Without these the concrete would crack and fall apart much more quickly.

Answer 8

Expansion & contraction of road materials will cause what we call heaving (buckling of the road ) .The gaps aren't filled with tar at first , they are filled with a silicon butyl combo then periodicly capped with " tar " to weather proof

Answer 9

To take care of expansion and to avoid cracks in concrete. Tar is soft and it takes care of expansion.

Answer 10

Because when it gets really hot things expand, Including roads. They put those spaces there so the roads wont fall apart when they do expand.