76%Have you taken test cubes/cylinders prior to stressing? KieranYes we got the required strength of cubes 25 MPa.1. Is this normal weight concrete, or semi-low density concrete? 2. What was the strength of the concrete slab at time of stressing? 3. Did......and one more thought: What strength did you design the links for? If you used the yield strength, then you can expect cracking. I would use muc...What kind of anchorage? and do you require containment reinforcing? and what is the concrete strength at the time of stressing? and part of the mi...ajk1, 1) It is normal weight concrete. 2) At time of stressing, the concrete strength is so strange. Within three days, it was around 55 Mpa....Why would a 35mPa mix break at 55mPa in 3 days? Something's wrong there. Are you sure you have the right cubes for the job? Agree with ajk1.......Ron yes, I first really learned of Lok tests, from Bickley whom I retained when we did a very large p.t. project at Carruthers & Wallace. It wor...1. 5 strand slab anchorage, bonded tendons are you sure the anchorage zone is getting compacted (vibrated)? 2. Is there a 25% initial stress pr...