I poured a reinforcing wall behind the stone retaining wall today.. and it was fun and so easy that I couldn’t believe it.. first I didn’t need any forms.. the excavation left a 20 in gap behind the wall.. In that area I had brick ties, drain pipes, drain tile, rebar every 12 inches horizontally and 16 inches vertically and landscape lighting conduit..
I needed 4000 PSI, so adding water was out of the question.. Instead I had them add a super plastizer that changed the slump from a stiff 4 inch to a 7 inch slump.
The truck back-up to the wall and shoved the chute over the wall and started pouring.. I had a stinger there because I was certain that I’d trap some air and not get into all the nooks and cranies.. I had long poles and shovels and several other items to force the cement into the areas behind the rebar and conduit etc..
8 yards later the truck pulled out and I hadn’t touched anything.. the second truck showed up and again all 8 yards went in without me lifting a shovel.. Perfectly in place like it had been invented just to go there.. The driver even had a sump pump so he could clean his own chutes etc. and not leave a mess for me to clean up after he cleaned out..
that super plastizer was funny though.. it weeped thru everything.. even the stone in the retaining wall.. that’s right right thru the stone! several large stones were dry around the edges but damp in the middle..
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sounds slick , when you say stinger do you mean a vibrator?
Yeh, I hear them refered to as stingers all of the time so that's what I called it
When it first came out in UK it was used for 'trench-fill' foundations, where instead of putting a 9" concrete foundation at the bottom of a 3'6" deep trench and building a double-brick wall to ground level, the trench was dug the same depth but only 13" wide and filled to ground level with concrete.
The whirly-truck just stood at one corner and dumped in the 'crete which flowed right around the foundations just like oatmeal.
IanDG