Had to pump some grout into a "socket" to fill the voids.  It was a slab sitting on "H" piles in 40' deep water.  The top of slabs were in the splash zone. They drove the piles then sat the slabs over the piles.   I pumped the grout into the sockets to stabilize the slabs.  The first truck we mixed the anti washout into, it was a little wetter than we wanted , slump at about a 7.  The next truck was tight.  We added 40 gallons to 5 yards and then poured the anti washout in.  I could not tell any difference in slump.  I came off my Olin 5-45 with 50' of 2.5 then 50' of 2" then down to a 1.5 steel pipe for a trimmie pipe.  I pumped slow to fill a 2 cubic foot void, It pumped like butter with no effort.  The first truck had a 3 day break average of 5000 psi.  The second truck had a 3 day break of 9000psi.

Wow that's a thick mix! Glad it went well it's all in the mix design. Geez you even had to reduce down to 1.5" I'm surprised that 0 slump went through.

It was like clay.  We pumped slow and it went like butter.  We added anti wash out into the mix and man does that stuff work.  Appears we have 3 or 4 more days to finish pumping these sockets.