How to calculate concrete strength using rebound number?
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Answer:
σbu = Pb / (π x d x l)
where,
σ = ultimate bond stress
Pb = Bond failure load
d = dia of bar
l = length of bar (in this case it is 200 mm)
Average bond strength at 0.125 mm slip = P1 / (π*d*l)
Average bond strength at failure = P2 / (π*d*l)
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