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madu

tensile strength of construction joint

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I hope someone can provide some answer or links as to where I can get the tensile strength of construction. We are doing a Post Tension ABOVE GROUND slab. The slab panel is very large and as to be carried out in 2 pours. For the first pour, starter bars are provided for the second pour. But in PT slab, after the pour, theslab is initially stressed after the first day and then the full stress after 7 days. PT slabs are different from conventional slab. The force P/Area is applied and the joint will debond if it is greater than the tensile bond strength. For construction joint, what  is the bond strength of the 2 nd pour concrete to prevent formation of crack line. The concrete bond to reinf is higher but the CJ crack will occur first.

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A little confused... tensile strength of ??? concrete, PT strand, bond strength of PT strand?  Can you use unbonded tendons?  Is this a slab on grade? and strand at centroid?  What are your pour limitations?  distance? volume? or area?  Lots of unknowns.

 

Dik

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