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I need to google pre-stressed concrete


Ralphie

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4 minutes ago, Ralphie said:

I mean wtf!  How do you pre-stress a fluid?  
brb!  These are the kinds of questions I wake up with!  It has been festering for a while so what better time for them to surface?

Ofc, is that another one of those Gen Z terms they use?

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But when is the tension on the tendons (rebar?) released?  Apparently tendons are not rebar - they are smooth, as opposed to  crinkly like rebar.
 

 Rebar is used in reinforced concrete. Prestressed must be those bigass beams you sometimes see on flatbeds. 

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35 minutes ago, Ralphie said:

But when is the tension on the tendons (rebar?) released?  Apparently tendons are not rebar - they are smooth, as opposed to  crinkly like rebar.
 

 Rebar is used in reinforced concrete. Prestressed must be those bigass beams you sometimes see on flatbeds. 

 

What is used to prestress concrete?
 
 
Prestressed Concrete - an overview | ScienceDirect Topics
 
Prestressed concrete is a system devised to provide sufficient precompression in the concrete beam by tensioned steel wires, cables, or rods that under working conditions the concrete has no tensile stresses or the tensile stresses are so low that no visible cracking occurs.

 

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3 hours ago, Ralphie said:

This splains it nicely, from the Wikipedia article. 

Before concrete solidifies, tendons embedded in concrete are tensioned

After concrete solidifies, tendons apply compressive stress to concrete

See!  I had brought up stressors and tensors before in another thread.

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