Worked 13hrs today on a hell-pour. The pour itself took about 6.5 hrs when it should've taken about 3. Shouldn't have been bad. We pumped 230 yds of crete into a wall that is 29' tall x 30" thick on three sides and 18' tall x 30" on the fourth side (picture a rectangle from birds eye view). We were supposed to get a mix with 2% accelerator at a 4" slump which would eliminate the need for boiler plates where the pour steps down if you pour it right. Alas the trucks came out with more like a 7" slump 1% mix. We poured the first 140 yds of that piss without a hitch and were supposed to start getting the 4" mix after that, once we caught on and were able to get the trucks on the road with the right mix. 140yds got us right about 18' up in the whole pour (top of the form on the one side). Now, picture filling a glass to the top with root beer and then dropping in a big scoop of ice cream. That's what happened to the 18' section when we started pumping into the 29' section. Not an actual blowout per se, but a few cubic yds of crete ended up on the ground below.