Technically, you need to wait the 28 days to achieve the full value of the expansion bolt or sleeve anchor, but at 7 days the concrete should be a 1/4 of it's compressive strength, 14 days 1/2 and so on. If you crank down on these, concrete will spall and you will have zero value on that fastener. I have done the testing on these many times, let that concrete achieve some strength first, just enough to avoid spalling. Given it's a sill plate, would seem you'll have a lot of pull out forces, but would be nice to know you have the fastener value needed for the load, given it is what holds the framing to the foundation.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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