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Concrete Blankets On Flatwork

 
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Old 12-29-2017, 10:02 PM   #1
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Concrete Blankets On Flatwork


Any suggestions on how to keep concrete blankets from putting small or large indentations in finished flatwork? Does flatwork simply need to set up longer before setting blankets? Pouring in the cold sucks...
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Old 12-30-2017, 12:16 AM   #2
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Re: Concrete Blankets On Flatwork


Go old school with plastic and straw?

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Old 12-30-2017, 07:26 AM   #3
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Re: Concrete Blankets On Flatwork


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Any suggestions on how to keep concrete blankets from putting small or large indentations in finished flatwork? Does flatwork simply need to set up longer before setting blankets? Pouring in the cold sucks...
If the blankets are leaving indentations, you are pouring really wet and youre not letting it set long enough before you wrap it
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Old 12-30-2017, 09:13 AM   #4
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Re: Concrete Blankets On Flatwork


There is a huge difference between pouring wet concrete and just leveling it off (amateurs) and placing stiff concrete and finishing (experienced). - There are some things you cannot control unless you have the power/control.

It is now -17F here (MN) and I saw several ready-mix concrete trucks out this morning that were "steaming". In many areas, a concrete supplier will close down some plants and accept longer hauls since it is cheaper.

Working in the cold just takes planning a day or two in advance. Timing and continuity are important, but that takes experience. In our are, most concrete plants have tall bins for aggregate to allow for drainage and warming. The unnecessary plants are "moth-balled" in the off season. The block supplier I worked for palletized the block to provide "snow caps" on top to keep the lower block clean and loaded all trucks the night before to allow protection from the weather.

Cold weather construction is not difficult, but just takes planning.

Our active contractor customers normally controlled the basement construction including excavation and protection of the footing areas from freezing with blankets and the used the blankets to protect the footings and walls.
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Old 12-30-2017, 01:49 PM   #5
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Re: Concrete Blankets On Flatwork


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Any suggestions on how to keep concrete blankets from putting small or large indentations in finished flatwork? Does flatwork simply need to set up longer before setting blankets? Pouring in the cold sucks...
Pour earlier in the day, use faster setting concrete, or wait longer to set the blankets. Having a few extra hands to set them is obviously better, as it limits dragging the blankets over the concrete.

We fortunately don't cover concrete very often, but when we do, we usually spread straw out first and then the blankets over the top. The straw has been the best thing we have found to limit surface scratching and dis-coloring so far, even though it is a mess to work with.
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Old 12-30-2017, 02:23 PM   #6
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Re: Concrete Blankets On Flatwork


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Pour earlier in the day, use faster setting concrete, or wait longer to set the blankets. Having a few extra hands to set them is obviously better, as it limits dragging the blankets over the concrete.

We fortunately don't cover concrete very often, but when we do, we usually spread straw out first and then the blankets over the top. The straw has been the best thing we have found to limit surface scratching and dis-coloring so far, even though it is a mess to work with.
If we pour footings in cold weather, we cover them with straw before we leave for the day
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Old 12-30-2017, 05:07 PM   #7
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Re: Concrete Blankets On Flatwork


I always build my formwork with hoarding in mind. Keep some uprights long on the forms so you can nail 2x4 across after the pour and the finishing is done so you can keep the blankets off the fresh pour. It helps to tie ropes on the blanket in multiple spots so the crew can pull it evenly without dragging.

Often times we hoard in a large tent structure before the pour on huge slabs, so we can finish it with heat already going. Keeps the hands nimble and the knee boarding less miserable when it's -30°C.

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