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Why is an airport runway made up of a series of concrete with gaps between them filled with tar instead of one continuous slab?
It is built in slabs with spaces between them that are required due to account for thermal expansions and give somewhat bouncy ride. Asphalt.
Why There Is gaps given in roads?
Gaps or joints are provided in concrete to allow the concrete to crack at those weaker section rather than random cracking, these are called as Contraction Joints and more over to release the thermal stress that might develop due to thermal expansion during hot season, Expansion Joints are provided.
Why do concrete roads are laid in sections with pitch between them?
If the road was poured in one piece it would have cracks all over the place. Instead it is poured in smaller sections with small gaps in between that allow the concrete to expand and contract due to heat changes. The strip on top is a seal to stop water from getting into the crack and also to create a smooth finish.
Why are the gaps between concrete slabs?
Contraction/control joints are placed in concrete slabs to control random cracking. A fresh concrete mixture is a fluid, plastic mass that can be molded into virtually any shape, but as the material hardens there is a reduction in volume or shrinkage.
Why are some roads concrete and others asphalt?
Concrete roads are highly durable and more environmentally friendly as compared to asphalt roads. However, asphalt paving costs far less than concrete paving. Also, asphalt road provides a little better safety of the vehicle against snow and skidding.
Why are runways not flat?
Runways aren’t flat because it allows rainwater to run off the sides and keep the surface as free of standing water as possible. Additionally, many runways are also built on land with a slight gradient, so they can, therefore, have an uphill and downhill direction, or a high point or low point in the middle.