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Why does the expansion joints in a sidewalk get narrow in the summer and get wider in the winter?
Wiki User
∙ 13y ago
In heat the sidewalks contract as when the winter comes the coolness cause's the sidewalks to contrast.
Wiki User
∙ 13y ago
Expansion joints in sidewalks are designed to accommodate the natural expansion and contraction of the concrete due to temperature changes. In the summer, the concrete expands with the heat, causing the joints to narrow. In winter, when the concrete contracts in the cold, the joints widen to prevent cracking and damage to the sidewalk.
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Sidewalks are built with cracks because in the summer something occurswhat is it?
they r called contraction joints. then every few of those then expansion joint. concrete is going to crack, so make it crack so it can't be seen,under the man made ones. concrete tends to crack symmetrically. so if ur sidewalk is 3 feet wide the contraction joints will be every 3 feet. then expansion joint, 3/4 inch with expansive material, every 4th one.
Why do you use a construction joint?
Construction joints are very useful, the expansion & contraction made is made in summer & winter season respectiely. In summer coz of temprature concrete get expansion in mm but it damage the structure, that's why construction joint is provided. Sunil Nagargoje TESPL
Does the sidewalk separate in the summer?
It depends on the humidity, heat, if it has rained, etc. Their can be different conditions for the sidewalk to separate.
Why do concrete slabs have space between them?
Those are expansion joints. During the changing seasons with varying temperatures, the slabs expand and contract. The spaces allow the slabs to expand without cracking the concrete.
Why small gaps are left in between two adjacent pieces of railway track?
These gaps are thermal expansion joints, they prevent the rails from buckling when they get hot in the summer. Although modern welded rail only has these gaps every mile or so to reduce the vibration and noise of the wheel crossing them (instead of every 40 feet on unwelded rail). All construction must provide for thermal expansion (e.g. bridges have thermal expansion joints, concrete road paving has thermal expansion grooves).
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Why is thermal expansion not visible in solids?
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What is thermal expansion and how bridge roads and sidewalks compensate or deal with thermal expansion?
Thermal expansion (TE) is a process in which materials expand due to changes in temperature. How different structures deal with or compensate thermal expansion (just some examples): Bridges and other structures have expansion joints (there are gaps in the road, which you hear/feel when crossing them in a car for example - usually in both ends of the bridge and sometimes in between as well, depending on the lenght of the bridge). Sidewalks - depends on the material of the sidewalk (sometimes there may be some spaces between different sections, but the temperature fluctuations are not so huge that it is reasonable to use any predicament against TE. Railroads - do you know the banging sound really associated with trains and railroad? This is a basic example of thermal expansion compensation. The tracks are assembled so that the ends of two track sections are not touching each other. The gap in between allows the track to expand in heat (therefore the sound of train wheels rattling is louder in the winter when the gaps are bigger and less in the summer)
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When the sun starts to go down on a hot summer day the air is cool but the sidewalk is warm. why does this happen?
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Fun outdoor summer activities for children include using an old sheet to make art on the lawn, making homemade bird feeders, and making sidewalk chalk art.
