They were like nothing I have ever seen before!
Supplier blames it on an overdose of water reducer saying that it had to rupture the surface in order to evaporate?
The recomened dose on the mix design was not to exceed 14oz/CWT of cementitious material, which comes out to 74oz/Cy or 740oz/...
Temp was 80 degrees at the time of unloading vs 90 degrees when the shrinkage cracks were observed.
Trucks were dumped sequentially and in less than an hour after batching.
High range Water Reducer was jobsite added to all loads.
Recommended dose of retarder was 5oz/CWT of cementitious...
During the final stages of a concrete slab placement the floor began reacting as a clay and showing signs of plastic shrinkage cracking (some of the cracks were so large you could put your hand in). Temp was 90 with winds under 10mph and humidity was approx 50%. Not conditions where you would...
