I have just de-molded a couple of panels and they have failed completely.
The mold release is water-based and we have not had any problems with it before.
I am using Trinic admix, plasticizer, hydration and hardeners, all within recommended dosages.
If it was 97 degrees there is no need to put a heating blanket on it. In the summer I just put plastic over it. Definitely looks like a moisture problem. How long did you wait before you put your backer coat over your facecoat?? May be that your facecoat dried out before you put your backer coat on it.
We often need to wait up to 20 minutes before we apply the first backer coat. In this case, the wait was only about half of that. The temp was still below 30 degrees (Celsius). We also sprayed the face coat with mist before applying the self-consolidating backer. We also used about 40% ice in both the face and backer coats to help retard the set time.
Having said all that, I agree with you that the most likely cause of the cracking/crazing is that the face coat dried out too soon. Unfortunately, we have had very high temps over the past week and I think the slabs are beyond repair as far as the customer is concerned. It is a very high-end kitchen and these slabs were for a stand-alone island that is the focal point of the kitchen.
It looks like we will have to start all over again for this job.
Sounds like wet mud baking/cooking/frying in the hot dry sun and cracking/fissuring on a huge pervasive scale.
aka it seems like theres wayyyy too much heat too fast. I'm pretty novice with concrete though with a huge love for phsyics.
With that much heat that quickly you better have that think submerged :P