More like 7 days . . .28 days
I am not sure what the standard is. But, it is usually a good idea to spray the concrete down a few times a day to slow down the curing.
More like 7 days . . .
http://www.pooleng.com/_coremodules/common/secure/fv-145.aspx
You could do waterline tile even earlier if you wanted to.
Frank, I don't read anywhere in the article that the pool should not be filled before twenty-eight days. That specific reference is to an unsupported shell wall. As long as the water level is below grade (fully supported) there should be no reason to wait that long. More important than compressive strength is flexural strength. As long as the shell is supported, there will be minimal flexural load on the shell. By fourteen days, most well proportioned concrete mixes will have reached at least 85% ultimate strength. If my pool builder was ready to fill fourteen days after shooting the shell, I wouldn't have any concerns.Thanks. But that wordy article - that does not really answer the question - but it does say that the only time you would wait a mere 7 days is in the case of exposed or out of grade shotcrete where you needed to back fill. Later on in the article it talks about 100% strength in 28 days and not to fill the pool with water before the 28 day period.
Frank, I don't read anywhere in the article that the pool should not be filled before twenty-eight days. That specific reference is to an unsupported shell wall. As long as the water level is below grade (fully supported) there should be no reason to wait that long. More important than compressive strength is flexural strength. As long as the shell is supported, there will be minimal flexural load on the shell. By fourteen days, most well proportioned concrete mixes will have reached at least 85% ultimate strength. If my pool builder was ready to fill fourteen days after shooting the shell, I wouldn't have any concerns.