Mortar in cold weather


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Old 12-04-06, 12:14 PM
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Mortar in cold weather

Temperature currently 32 degrees in Michigan. Is there a mortar better suited to cold temperatures when working with cement block?
 
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Old 12-04-06, 01:24 PM
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Mortar in cold weather

What are you building?

You do not need any special mortar, but use different procedures.

Heat your water and/or sand to provide a warm mortar.

Cover the masonry, preferably with an insulated blanket for the first day or two after construction. If it is sunny, let the sun get to it, so the masonry can absorb heat.

To insure durability, protect the mortar from freezing while it is saturated. After laying the units the curing of the mortar reduces the moisture content to a low enough level so any freezing will not be detremental. Upon raising the temperature, the mortar will resume curing when there is some moisture present. Unless you are applying high loads to the wall immediately, the strength of the mortar is not a factor.

This morning, I saw a crew wrapping up a small conversion of a fast food building into a bank- 2 walls about 15' high and 30' long with 12" split face colored concrete block walls. They heated the sand that was stored/piled on a metal culvert with a LP flame inside. Water was in a 55 gallon barrel with propane under it. They had blankets laying around that I assumed were for night protection. Temp was about 15 degrees with snow flurries.

Mortar is different than concrete when it comes to cold weather construction.

If you want a lot of details, go the the National Concrete Masonry Association (NCMA.org) and look for the TEK note on "Cold Weather Construction".

Dick
 
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Old 12-04-06, 01:34 PM
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Thanks

I'll let you know how it works out>>
 
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Old 12-04-06, 02:40 PM
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at what temp is ok to use that mix concrete stuff
 
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Old 12-22-06, 10:08 PM
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you can use standard concrete accelelerator as an add mixture for cold weather masonry also , it speeds up the setting process and reduces freezing , its also refered to as inti-hydro, I live in Northern Canada and sometimes we are delt -30 to -45 degree celcuis weather and we sometimes use regular automotive Prestone antifreeze as an additive one cup of prestone per 2 bag mix, its just enough to keep it from freezing and just enough to not effect the strength of the mix, we've had it tested by engineering firms and sometimes it comes out even stronger then a convential mix, ony use the prestone if you are painting over the wall because sometimes the colour mary vary with this method.
 
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Old 12-23-06, 07:52 AM
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Mortar in cold weather

The use of chloride in mortar is limited to 0.2% according to most codes and industry standards.

Antifreeze is not recommended for use in mortar and is never allowed in grout.

History has shown that material preparation is the key to cold weather masonry. Heat sand and heat water to provide warm mortar.

The strength of mortar is not critical. Durability is the critical factor and this shows up after the mason is off the job.

Dick
 
 

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