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Wrong Concrete any concrete experts out there
Before you get into recipe re-jigging, which strikes me as a lot of work too, there'd be an assumption that the fine aggregate in concrete mix is the same as in post hole mix. I don't know myself but I'd check that assumption out carefully because fine aggregate for structural concrete is specific stuff. Saudi Arabia imports sand from Australia because desert sand isn't suitable for structural concrete.
I suppose somebody who knows this stuff could come up with a formula for adding large aggregate and likely more Portland to the mix and come up with concrete but it could lead to interesting arguments if the work failed. I don't think I'd do it for a paying customer myself and if I did I'd document what was done very carefully.
It strikes me that the real problem is a mistaken order from the Mac-materials place and they should straighten it out at their cost. It'd be quite a bit of work to remix the stuff and then you're going to have a bunch of post-hole mix left over. It is a little tough to deal with these box store places though. Once you're out of the store you tend to be on your own and dealing with CS is more painful then just straightening problems out yourself. I can sure see why you wouldn't want to load and unload 65 bags six times though and I'd sure complain long an loud and maybe threaten too if the order says concrete mix and the yard guys brought out the wrong mix. It shouldn't be your job to read the bags before driving away with them.
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Wrong Concrete any concrete experts out there
Tough call either way and I wouldn't be fit to be around for weeks if it was me. I'd probably do the return thing. At least I could take pallets of the bags on and off a truck at my end with my 3ph forklift and maybe the box store has a forklift at their end. I'd probably invoice their corporate headquarters for my time just to see what happens but mostly so a CS type would end up absorbing some of my bad disposition.
Also tough to keep track of names when writing these things but Peters really contributed to this one as well as many others. A re-jigging recipe from the manufacture is a good idea. It would be good documentation that the mix should be OK for the job and they might know typical setting times of a re-jigged recipe as well.
I'm not sure if aggregate for concrete mix has to be specified as 'clean' or not but that's something to check. I find that the low prices from box stores sure have high costs most times and I try to stay out of them as much as possible. Gook luck with this one and I hope you remain fit to be around.
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Wrong Concrete any concrete experts out there
Well now here's an attitude I can relate to in the circumstances. Probably a little more restrained than I'd be but maybe it's just consideration for all us readers who aren't in the situation.
Doesn't happen too often anymore but I trapped myself in a typical auto box-store situation last week. I want relocate the ground cable position on my tractor. It's just a short cable that connects to the battery box and likely isn't the best ground location. I figured I try to run a length of heavy cable to a mounting bolt on the starter motor. I found myself walking out with a 56" 1-gauge cable that probably is heavy enough and maybe isn't long enough. It's not what I wanted but with all the narrow aisles, tall shelves of junk, people wondering around in dazes (staff included) and crapy music mixed with crapy announcements I guess I couldn't wait to get out of there and just grabbed something so I could leave. Merchandising is a sophisticated buz and I believe the environments are intentional 'cause I sure wouldn't have bought that cable if I hadn't been approaching a state of shock. Of course, I'm 'country compensated' now and even parking meters dazzle me.
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Wrong Concrete any concrete experts out there
On one of my rare trips to 'the city' last week (trips to town are barely tolerable but trips to the city are rare enough that they qualify as adventures) I noticed a commercial slab on grade being poured. It looked like a high-speed conveyer that was flinging concrete at least 50' off the end of it. I probably saw more concrete as we drove by than is mixed in my entire Township in a year.
I recalled that when I read this thread and thought 'Well those things may not be suitable for small projects but they'd sure be a lot easier on the back, legs, arms and disposition than wheel barrows shovels and hoes.' Bet you're glad the project is done.
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