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Not a full extra layer, but what it could be is some low spots had concrete thrown on late to finish elevation.

But it was also wet in the other placements tha we have made, are there were no cracks because of it

Thanks copositepro. So the cracks occurred only a couple days after placing, so are you saying the voids formed quickly? Or may have been already there. I would also like to point out that some of the sand we mixed into the concrete was wet and may not have been fully mixed into the cement and...

The cracks were consistent, about 15 total mini volcano looking crack, but only on one side of the pad. The cast concrete was wet and covered with vinyl for 24 hours after placement. It was however very hot and somewhat windy at the time and did dry very quickly. Definitely not sulfate attack...

We used dobie blocks Compositepro, could you elaborate your point about compaction and settlement, I don't quite understand

About two hours after we did our last broom finish, we wet the concrete and covered it with vinyl. The next day, or 24 hours after, we took off the vinyl and stripped forms. No cracks formed until 3-4 days later, around the time it rained. Can't really give a good answer about the air bubbles...

#4 bar 16" on center, 4" slump, control joints every 10 feet.

We placed a 100' x 10' x 6" thick reinforced concrete pad over a 12" engineered well-graded granular based. After 4-6 days, we began noticing some hairline cracks in a radial direction. The cracks were no more than 3 inches across, and every single one of them measured 1/16" to 1/8" higher than...

We placed a 100' x 10' x 6" thick reinforced concrete pad over a 12" engineered well-graded granular based. After 4-6 days, we began noticing some hairline cracks in a radial direction. The cracks were no more than 3 inches across, and every single one of them measured 1/16" to 1/8" higher than...