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Could the posttensioning of slabs increase the strength of concrete at the compression fiber?

When the concrete in compressed at early stages the air voids will close and we will have less voids, hence the air void decrease the compressive strength of concrete so reducing it will increase the strength!

 

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Question added by Abedasslam Farhat , GIS Specialist , Ras Al-Khaimah Municipality
Date Posted: 2016/02/24
Sunil K
by Sunil K , Assistant Engineer , Ajmera Realty and Infra (I) Ltd.

No it helps in tensile strength mainly.

Bobby Raner
by Bobby Raner , Civil/Structural Design Engineer , Mitsubishi Heavy industries - Asia Pacific

When a concrete slab is subject to compression and the steel into tension before any substantial service loads are applied, puts both building materials into their strongest states. The result is a stiffer concrete slab that actively is compressed and has more capacity to resist tensile forces.

Ahmed Al Janubi
by Ahmed Al Janubi , Senior Civil/Structural Engineer , SNC-Lavalin Fayez Engineering

The compressive strength of concrete is the same but the load carrying capacity will definitely increase when it is post-tensioned slab.

Paolo Stella
by Paolo Stella , Property Manager , designers with Philips Lighting Corp. engineers

yes through triaxial behavior of the material

when you post tension the concrete basically you are increasing the strength of concrete to bear the more tension when there is huge loading like bridges etc and steel can have less tension forces. so by post tension the concrete you increase its strength to take more load.

Uchenna OKOYE
by Uchenna OKOYE , Junior Structural Engineer , Global Oceon Engineers Ltd

Absolutely it can, because due to posttensioning both steel and concrete are at the peak of their strengths (increased strength), thus making its possible to resist loads when applied.

Manish Bhambhani
by Manish Bhambhani , Civil Project Engineer , aecom

Because post tensioning will induce some negative moment into slab/beam which means compression fibre is receiving some tension and tension fibre is receiving some compression. What this does is when you have the slab/beam loaded it will have additional strength because of some negative moment already induced so your positive moment would be lesser compared to your traditional beam/slab. Also this will help you out  with deflection as well.

Denis Cuison
by Denis Cuison , Construction Assurance Engineer / Material Engineer , Louis Berger - Egis Rail (PMC)

Post tension slabs require high grade concrete strength thus increasing the strength capacity of concrete at compression fiber.

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