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Watering new slab questions

brnctt

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Apr 20, 2023
Messages
107
Folks, I know there are tons of topics on this already, but hoping for some advice for my particular scenario.

Our new slab got poured Friday. It was cool (50s/low 60s) and cloudy all day, then it rained all weekend. So it got a solid 2 days of complete wetting. I also went out to manually water it Monday evening (slab was still 80% "dark" on the surface).

Now it's Tuesday and it's sunny all week, although still cool in the low/mid 60s as highs, lows between 35 and 50.

My issue is the site is 45 minutes away from home, so every time I go out to water it it's a 1.5 hour round trip drive. Is it worth it to drive out only once per day to water it? Or am I just wasting my time? I know ideally you'd water it frequently/hourly, if it were in your backyard. I can't hang out there because I need to work during the day, but i could visit once per day.

I can't set a sprinkler on it either because I need the extremely muddy clay soil all around it to dry out this week so I can do some grading and driveway work this coming weekend. Takes a full week for the dirt around here to dry up after heavy rains.

Should I just let it be now? Or spend the 1.5 hours to drive to water once per day? I'm hoping since it's cool, the curing is slowed due to that, somewhat negating the benefit of watering frequently as you'd need to do in hot, dry summer.
 
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ConCretin

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Jan 20, 2011
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Central Maine
I wouldn't worry about it. The only purpose of curing protection is to prevent mix water from evaporating prematurely before the concrete has reached adequate strength. This really isn't a concern in your weather conditions. Your concrete will be just fine at this point.
 
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brnctt

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Apr 20, 2023
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107
Cool, thanks a lot! I'll still be sure to spray it if I'm out there incidentally.
 

Rusty Wrench

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Aug 19, 2021
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I'm a firm believer in a wet cure. Have done so on all my flat work but still agree with ConCretin.
Alternatives are tarp it or a sprinkler timer.
 
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brnctt

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Apr 20, 2023
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107
Actually, I see on amazon there are battery powered timers that go on your hose. Interesting!

Since the slab is so large I wouldn't get complete coverage. Is this more damaging than beneficial (uneven watering)?
 

ConCretin

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Jan 20, 2011
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3,379
Location
Central Maine
All you are doing by spraying water on a slab is sealing the surface to keep the water in the slab from evaporating. A chemical curing compound does the same thing. The concrete doesn't need any additional water - it has plenty right out of the truck. Spraying a little water here and there isn't making any difference at this point.
 
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