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White powdery substance sprinkled on new concrete


mossman's Avatar
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11-30-17, 06:23 PM   #1 (permalink)  
White powdery substance sprinkled on new concrete

Just had my new driveway, apron, and gutter poured. When they were done finishing, they spread a white powdery substance all over the apron and curb. Is this curing compound? I told them repeatedly to not use white curing compound. Is it too late to wash it off? If so, how long is it going to take for this to fade away?

 
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11-30-17, 08:17 PM   #2 (permalink)  
Your post begs the question why don't you want the concrete to be properly cured? That is why it's done. If it's colored concrete it will prevent efflorescence from showing.

 
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12-01-17, 07:17 AM   #3 (permalink)  
It isn't colored concrete. Of course I want it cured properly. I was thinking curing compound was a liquid spray, not a powder.

I noticed some rust spots and scaling this morning, so it looks like they'll be tearing out the walkway anyway and redoing it. Patching the holes is not acceptable. I'm going to name this project the "Murphy's Addition".


Last edited by mossman; 12-01-17 at 08:00 AM.
 
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12-01-17, 07:38 AM   #4 (permalink)  
The builder is saying the spots are from asphalt dripping off the new shingles. Makes sense, because it rained last night, but I find it hard to believe drops of rain dripping off the roof 9 feet above have enough impact to damage the surface of fresh concrete. Must be a chemical reaction that created the holes.


Last edited by mossman; 12-01-17 at 09:05 AM.
 
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12-01-17, 09:07 AM   #5 (permalink)  
Yep, rain drops...especially hitting the same spot repeatedly (like dripping off of the separation line on shingles) will cause surface flaws.

Was it covered since rain was expected?


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12-01-17, 10:55 AM   #6 (permalink)  
Yep, rain drops...especially hitting the same spot repeatedly (like dripping off of the separation line on shingles) will cause surface flaws.
Makes sense.

Was it covered since rain was expected?
Sure wasn't. I didn't realize rain was in the forecast, but I should'n't have to worry about that. It's on them. Plus I asked the builder on more than one occasion to cover the driveway and walkway with curing blankets, which they didn't do, and which would have prevented this from happening. I'm pretty confident they'll make it right. They'll likely tear out the walkway and pour a new one with bagged mix. I haven't checked yet, but I'm hoping the same thing didn't happen to the driveway. It's just frustrating that this even happened to begin with because it could have easily been prevented.

 
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12-01-17, 03:34 PM   #7 (permalink)  
Well, have fun, because bagged mix won't be a color match. Of course a new small load in one of those tow behind carriers probably wouldn't be either, even from the same plant.


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12-01-17, 04:30 PM   #8 (permalink)  
It's just frustrating that this even happened to begin with because it could have easily been prevented.
Yes, well, that's the job of every competent general contractor... to babysit the subcontractors. That's how it works.

 
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