Why these red lines are painted at the bottom of huge slabs????

Hello friends. Hope you all are well.
Have you always wondered what are those nicely painted red lines at the bottom huge slabs. Well, make sure you watch this video till the end and I hope you will surely understand the purpose behind it.
Animation credits : PTSI
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[@thenoob2942]

Good explanation i was very curious to know use of that strips

[@modassariqbal306]

Its most informative video...thnks

[@EverythingCivil]

Thanks for watching..share it with your friends..

[@mohammadkhorshedalam133]

very useful video. thks.

[@muzammilmarediya]

Thank you 4 this video

[@badalgallery]

Extremely informative

[@EverythingCivil]

Thanks for watching. Keep supporting.❤️

[@gixerriders1993]

Very useful information also upload a design of co- extension slab video

[@EverythingCivil]

Thanks for watching.

[@shkendale]

Nicely explained bhau... Thank you

[@EverythingCivil]

Keep watching

[@puneithjain6815]

Flat slab 😍😍😍

[@MrPadraj]

Can we use the combination of PT slabs & red bricks? Can PT slabs bear the weight of 5 floors of red brick walls

[@karankangale8241]

🙌💯

[@MrPadraj]

Can a conventional slab span 35 feet? Or better go for PT slabs

[@salmanisrar8816]

how would we know the exact location of post tension line for marking it like this??

[@EverythingCivil]

We marking it on the shuttering surface before pouring concrete. So after removal of shutters the paint is usually stuck to the concrete.

[@modassariqbal306]

Sir ye Red color jo paint krte hai pt slab k bottom k niche to hume pata kaise chalega k is jageh p tendon gya hai kue ki slab to cast ho chuka hai to paint kaise kre g tendon ki position dikha n ko sir red color s???

[@EverythingCivil]

Jab tendon rakhte h tab shuttering pe paint karte hai..to jab deshuttering karoge to wo paint ka chapa dikhta h slab ke bottom pe.

[@mohamedhabib7901]

In Indian locations, anywhere we can provide post tension bars? Because many contractors can't do ? I know it denotes high strength in tension, but what load we can use? How we know this area we will provide post tension?

[@EverythingCivil]

Habib, Post tensioned members are generally suitable when the span of the tension member is very large, the loading is extremely heavy. Example is a bridge deck where load is heavy and span is large. In our case we had provide PT slab as this was a public parking lot for bus and truck at P0 and P1 with 14m clear span and for consecutive floor there were floating columns on slab therefore slab loading for very heavy too.

[@Ashou11]

At what distance can the drilling be done from PT slab for Fire line pipes?