Concrete Pouring Tips
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Concrete Pouring Tips
Even though concrete is a versatile
substance it does have its limitations that you should consider.
Concrete is effected
by temperature, too hot and it dries with cracks, too cold
and it takes forever to set-up- There are chemicals available
that will allow experts to pour concrete in even the worst
conditions, but trailered ready-mix is not intended for these
specialized applications. But, if you make proper plans in
advance you should be able to pour concrete anytime.
Most
small concrete pours should be planned when the emperatures
are between 60 and 90 degrees Fahrenheit. This means that
the concrete will begin to set-up in a reasonable time but
won’t
set-up before you have a chance to finish it.
Hot Weather Tips:
- Plan ahead. If you can make arrangements
to pour in the cooler time of the day, this will minimize
the effects of trying
to finish the concrete in the heat.
- Wet down all the forms and ground just before
you pour in the concrete. This will reduce the rate of
evaporation of the moisture in the concrete mix.
- Avoid adding water to the mixture because
it will lower the strength, increase cracking
and reduce the durability.
- Limit the time between placing
the concrete and final finishing.
- Use a fog type spray nozzle
to maintain surface moisture and to prevent evaporating
away the "bleed" water
out of the concrete mix before it can be
troweled smooth.
- Provide sunshades to control the surface
temperature on the exposed surfaces.
- Erect windbreaks to reduce
the chances of a dry wind that will cause the surface
to cure too fast and crack.
- As soon as the concrete is finished,
begin a moist cure by keeping the finished surfaces and
pour area
damp for the next few days.
- On extremely hot or windy days, it may be best to
reschedule the pour for a day with more favorable conditions.
Cold
Weather Tips:
- Do not plan to pour concrete when the temperatures
will not get above 60 degrees Fahrenheit.
- If you can wait
till the sun is shining on the pour site then wait.
- Use a
concrete mix with a low water volume so that will have
less moisture to reduce cure time.
- Provide a curing membrane that
can be as simple as a plastic tarp or as sophisticated
as a concrete curing blanket.
- It will take longer to cure so you
will want to take precautions to keep unwanted travelers
from making an impression on your hard work!
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