Thanks for a sensible reply Den, It's been like this for YEARS but this past week, the builder really pitched a bitch on a 45 yard driveway/garage approach on a $800,000 home and IMO, for good reason  !! 

I fail to see the relevance of Biden and concrete  ??

Every one wants to make it POLITICAL  , LMAO !!!

Concrete Grey White!!!

Trust me, the SAME  !! It will look the same in 15 years, I can verify that to this day   !!

I'm not the General Contractor, it was a "generic" question, and other than YOU, why are the answers I receive are "un-liked" in your opinion ???

why ? could be that the raw materials are different. Say the stone for the second batch comes from another quarry, or the cement form a different manufacturer.Maybe one of the additives was changed ??

Concrete might ,eventually ,change to  SIMILAR colour, but I wouldn't expect it to.

BIG THING when using stucco for a house, order at LEAST 2 extra 5G pails of it !!! There's no way you'll get the SAME colour a day later, let alone 5 years from now.

Car paint is terrible. even with 'computerz', no one get the match 100%, though some of the water borne stuf is kinda close.

That's what I'm a'thinkin'!

  Portland colors are different colors from each supplier, around here some companys use granite and some river rock, the list is long.

I see no concrete evidence of a single answer to this question...

I can set here and wait for an answer all night, but sleep will cure me of the problem

There, we have a firm foundation for a pun-fest!

I hope this paves the way for more!

Well Chute... this just reinforces all the hard facts: I'm too pour to go on strike, too heavy to float the cost, and too much of a sinner to ever cast any stones...

One of the most common reasons for color variation, (aside from changes in aggregate source), is what ever residue might still be in the kettle from a previous pour.  When an archetectural deco mix is ordered with mixed-in dye, the following batch frequently shows evidence of stray pigment.  Sometimes that change in color is due to the addition of potash (or contamination from a prior load).  If it's in a high-safety circumstance, there's no reason not to reject it, as contract specifications are pretty clear.  A quality supplier will make absolute certain that the spec is met, as a failure of non-compliant concrete would place them directly in the path of liquidated damages, liability, and subrogation.  A good supplier wants it to your site RIGHT, which means all the proper admixtures, no contaminants, proper slump and temperature.

In structural circumstances, I personally always take a slump and temp measurement, as well as fill at least 4 sample cylinders, and then cast some leftovers into a 12x12x8" stepping stone for future reference.  In my non-structural, I cast some stepping stones so that I can observe the shrink/crack over long-term.  I do not get too caught up in color, but when someone is doing a decorative pour, they're certainly not in the wrong to desire a color match... but once it's down and hard, the only options are either to 1) knock it out and try again, or 2) apply a surface dye.   The problem is, that when concrete is fresh, it's 'green'... and the color does change, and it is basically impossible to prove WHAT the color change is, until after it's been down and solid for at least several months.

Quality control on concrete can become an extremely serious biz.  A bad batch, in the wrong place, can cause some very, very, very bad things to happen.  Our concrete pours (company) have test samples taken for cylinder break tests for 14, 21, and 28 days, and when we have a sample failure, there's a whole lot of remediation considered in order to make sure we don't experience those very bad things.

A pair of large bridges were recently built in my area, they have steel-reinforced concrete arches.  I don't care one iota about the color match of those arches... I just don't want them to ever fail.

 Dave, didn't you also have to do a air test every sample, I know the company I work for did but I can't remember if it was mandatory or not, the supervisor we had always had us over sampling everything just to be sure are asses where cover.

 Also how do you like doing the daily report for the project? I thought it was a lot of wasted time and a pain the ass. 

Eggcellerate?  You're in the wrong thread.... that goes in the Chicken topic...

(but it's a good yolk... you should white them more often...)

Fortunately, Kenny, I am not the guy that has to do formal tests, the people strapped to that duty are who I go to to pull records when there's a developing problem.  I do my slump and cylinders for my own projects, for my own reference, and the person who determines those requirements, and answers to any failures, is just me   but yes, air-entrainment is a concern... like admixtures, application of air entrainment is critical to making certain concrete pours survive freeze-thaw... but to get an accurate measurement in a fresh batch, it really takes a pressure-vessel test, and that's not something I happen to have lying around.  I've got several microscopes, so I can cut a piece after-the-fact, and look at a cross-section, but by that time, it's too late.

The reports will be a PITA in many ways, but no worse than any other production under 100% quality assurance through statistical process control.

Most people don't 'get' the difference between 'quality control', and 'quality assurance'.

Quality control is when you use output data of a process, to control the input and process, to provide a production result that is not only the most consistent, but having the lowest failure rate.

Quality assurance, is when you check EACH component, and remove any components that failed, so that no matter WHAT goes out, the  ONLY thing going out, is 100% good.  While you're at it, take all the failed ones, send them back for forensic analysis, find out WHY they failed, follow it back to the Root Cause, and FIX THAT, so the Quality Control number improves.

 I definitely know what you're talking about I was in the game for 27 years and was certified in Agg 1&2 concrete 1&2 and asphalt 1&2 about the only thing I couldn't do was job mixes but help on a lot of them, I done most of the proportionate material for concrete and asphalt yes I run a lot of sample each year, I covered from just out side of Mechanicsville to Montour just east of Marshalltown, had all of the Cedar Rapids area including the quarry on the north side of Robins and the one just west of Springville ,one up by Coggon, also one out by Vinton and one by Garrinson and one we call 4 county just south of the CR airport and three sand pits, The sand pit were just spot check because the plant man was certified also. I would also did a lot of asphalt testing when they were running out of Moscow quarry which is west of Wilton on 6. I remember when doing concrete or asphalt testing the day were long and on the go all the time and the guys that done the daily reports would still be their when I was walking out the door after getting all the test equipment clean up and the lab for the next day some day were 14 hrs and some long if I had to help cut cords in the mornings. I didn't do concrete test all that often just when someone need of or sick. I know with concrete you had to be around it to be good at it, I had to almost carry the book around with me. Thanks for letting rumbling on.         

 

    

 Dusty

2094, wow!  What's it like then?

Local concrete company where I grew up used to throw two 50# sacks of Sugar in each truck, should the truck break down and the Pony driven mixer still be running to keep the batch from setting the drivers were instructed mix the sugar in the mix.  Would still set up but SOFT, could darn near to remove from the old mixers(7 or 8 yard) with a shovel.

 Have a good time.

 

 Dusty

Didn't mean to pick on ya' Dusty, it's all good.  Try not to pick apart typo's much, but that was a funny one!

Hope all is well with you.  I never did get to stop by on the way to K'zoo..

Hope he had a fish sammich with him .

Don't have a clue as to what happened.  Don't care much.  Maybe it was burnout, maybe something else. Too bad, he used to rail at all the guys with over 20K posts, yet never made it much past 4.5 K!  A bit of irony, to chuckle at...