Thank you all for your valuable comments and advices.
I kinda agree that it would take quite a bit of eccentricity to produce a local moment to crack the bottom of the slab.
The concrete strength at stressing was about 4000 psi.
At first, I was suspecting that the curing may have caused...
Wyanko
the cracks are parallel to the slab edges, and the slab edges are cantilvered free ends. The uniform tendons are perpendicular to the slab edges. the cracks are at the bottom of slab and almost everywhere at anchorage location
both shop dwgs and contract dwgs show the anchorage @...
Here's the condition:
8" post tensioned slab with 1/2" 7-wire strands, undonded.
Hairline cracks x 8" long consistently happen at uniform tendons dead end location at BOTTOM of slab. The cracks are perpendicular to the uniform tendons direction. Found at almost every (maybe 50%) location of...
