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It was moist from previous storms, but not overly saturated.

approximately where I’ve highlighted red in the attached picture. It’s roughly 10 ft long, most of it is kind of hard to see except the portion I posted in the original post. Only a couple of feet are obvious.

Thanks for your input.

Thanks. Is it beneficial to seal the crack with epoxy or something else prior to applying plaster. Also, since we’re on the topic, what is the minimum temperature requirements to ensure the structural integrity of the plaster?

Concrete cylinder breaks came in over 4000 psi at 28 days. The mix had hot water and 1 lb of microfiber/yard. I believe the blankets did a descent job at trapping water and keeping the slab conditions humid. I’m not an engineer, just my observation of the shell as I monitored conditions generally.

It was covered with concrete blankets in temps ranging from 45 to 30 degrees for two weeks.

This crack appeared several weeks after gunite was placed. I’ve notified the pool builder and he said he would look at it when he returns. I’m in Utah, and we are waiting for warmer weather (March) to continue building. Is this overly concerning, and if so, what are the proper steps to resolve...