0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
Why concrete roads are laid in section with pitch between them?
Concrete, whether in a road or a building expands (gets longer) in hot weather and contracts (gets shorter) in cold weather. So the builders install an expansion strip every so many feet to allow the concrete to make these small but significant changes in length. If this were not done, the concrete, when warm, would expand, and having nowhere to go, would go up (roads) or out (buildings), thus ruining the road or building. These expansion joints are filled with pitch, tar, or mastic - they call it different things in different parts of the country - to keep out water. Water would freeze, and cause the same problems.
Why a gap is left between two pieces of rails in the railway line?
These days that's no longer always the case. It used to be because as the rail warmed up in the sun it got longer, so gaps was left for the rail to have something to expand into. w/o the gapsor with too small gaps it happened that the rail broke loose from the sleepers and caused the train to derail. To day many railroads are using concrete sleepers, which are strong enough to keep the rails in place w/o any gaps.
Why do railway tracks have gaps in them?
Railway tracks have gaps to allow for expansion when the tracks heat up. As the tracks get hotter, they expand and get slightly larger. Without the gaps, the tracks would buckle from the force of the expansion. They have fishplates located between the joins to force the rails back into lateral alignment and thus prevent derailments.In modern continuously welded rail these gaps are often cut on a diagonal to prevent this misalignment. The thermal expansion and contraction of rail track is minimal and the forces push to the outside rather than along the rail.They are also there because segments of rail have traditionally been required to be removed and replaced easily and so had to be made a manageable length.Heat expands metal, to prevent buckling in the rails the tracks are in pieces with gaps. Another reason is in case of lighting strike the electric current can only travel as far as the first gap, this preventing electrical charge getting to a train car or electrical box.because the railway lines expand during the summer and by the friction of the train with it . if the gap is not kept the rail lines would expand and break. so to avoid the breaking of the rails the gap is keptThere is gaps between railways because during summer when the sun will heat the rail which is made of iron will obviously expand.After some calculation an approximate distance is left between them.After this answer you will ask but what in winter and how does the train pass on the gaps?So this gap is nothing for the train. It is left so that during expansion when the railways will expand the rail will not change direction.For e.g:-imagine when you take 2 drinking pipe and joint them together it will change direction or even damage.when heat is supplied to a substance or material it will expand.during summer the tracks get heated as a result it will expand. if gaps are not provided, that may result in the bending of tracks.Railway tracks have expansion joints to prevent them from warping when they expand during very hot weather. The metal on railway tracks can conduct a lot of heat during sunny periods.There are small gaps between the length of the railway track because when the temperature is hot the metal will expand and cause the train to crash. So if there is a gap between the length of the train tracks the metal wont join together and cause the train to crash. When the weather is hot have you ever noticed that the trains go slower? Thats just in case the metal joins together.A.thermal conductivityB.specific heatC.thermal expansionD.thermal insulationThe gaps are there to allow for the expansion (lengthening) of the rails in hot weather. Without any gaps, the rails would buckle and go out of alignment.
Why reinforced concrete can failure?
Concrete can fail for many reasons:wrong mix for job requirednot proper depthpoured when frostypoured when too hotnot left to cure long enoughif upper level no secondary proppingif ground slab hardcore not compacted properly or thick enoughrunways should not be used for at least 3weeks..
What is lean concrete used for?
Stressed concrete beams have a variety of uses in civil engineering. They hold up roofs and bridges among other things. -These concrete beams are not just concrete, they have steel cables inside that create a tension to make the beam stronger.
Why gaps are left in concrete slaps?
With the weather the concrete can expand or contract and the gaps in the concrete are left to allow for this expansion of contraction so the concrete doesn't crack or break.
How do concrete gaps keep the concrete from cracking during the winter?
During winter when the concrete contracts/shrinks and there is no gap, then it will crack from the surface. So gaps are left in concrete such that it can shrink to a safe limit without cracking it.
What is the function of the gaps at the railway?
It depends which gaps you mean! Older track was laid in discrete sections with gaps left between them to allow for expansion on hot days. There are gaps between rails at the points which are used to connect different tracks together in turn. Is this what you mean?
What does two blocks to the left mean?
A block is a city area composed of the land between two streets. If your directions are "two blocks to the left," then you need to travel toward the left past two streets.
Why are gaps or spaces left between cemented block and iron rod instead of laying them so that each side touches?
Once the concrete is wet, it will begin to cure. It must be kept moist while it cures, and this can be accomplished by slowing the evaporation of the water that was mixed into it. Usually, this is done by covering the concrete with plastic sheeting or by spraying it lightly with water as it cures. Concrete will shrink and expand with temperature, so large slabs must be fitted with expansion joints. These are most commonly seen as the gaps in roadways and sidewalks, but they are also built into walls and other structures as well.
What eventually happened to the gaps left in the periodic table left by Mendeleev?
he knew that later on the gaps would eventually get filled up
Why gaps left between two sections of rail tracks?
Metal can expand slightly when heated by the sun, a small gap allows the rail to expand, that said modern rail tracks are welded and do not have these gaps.
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).
What are the gaps in the concrete road made of and why is that material used?
There are several ways that the thermal expansion joints in a concrete road surface can be made:cut by a concrete saw after the concrete sets, there is no material in the jointfilled with a compressible fiberboard spacer before pouring the concrete, this spacer is left behind in the joint and easily compresses when the concrete expands and expands when the concrete contractsfilled with interleaved steel teeth before pouring the concrete, these teeth slide past each other as the concrete expands and contracts they provide a smoother road surface and are commonly used on bridgesetc.
If a person left a place and went 8 blocks west then 4 blocks south then 3 blocks east then 2 blocks north then 5 blocks east how many blocks is he away from where he left?
2 blocks south
Why do you think gaps are left between rails?
I don't think but I know they leave gaps because of the heat. In Summer the Gaps Spread apart which means your going to hear more noise on the train in Summer. But In Winter Expect a quieter ride. You may still hear some noise but trust me its true
Why was leaving spaces and gaps in the periodic table later vindicated?
Those gaps were later filled by elements discovered after the creation of the table, which justified the gaps being left for that purpose.
