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Old 09-22-2010, 10:59 PM   #1
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Cement Question

I have a bag of Type S mortar that I bought about 8 or 9 months ago. It was opened and I used some, but it was placed in a trash bag and tied up. I used some today to repair a few rocks that fell off of a natural stone retaining wall and it seems that the cement has lost its bonding ability. Is that possible, does cement lose its properties after a while? Thanks

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Old 09-23-2010, 06:22 AM   #2
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Cement Question

Cement/mortar absorbs moisture from the air and will harden, but if not hard, it has always worked for me. What are you using it for???

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Old 09-23-2010, 06:47 AM   #3
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Location: Western Masschusetts
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Cement Question

joeg. absolutely DO NOT use this bag of cement.
it is junk.

for $4 it's not worth the risk.

i've had to learn this the hard way, having to rebuild a shower curb because of an old bag of mortar.

toss it out.

in the future, any leftover is immediate garbage, in my opinion. sprinkle it in your driveway, dump it in the woods, whatever...
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Old 09-23-2010, 07:18 AM   #4
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Cement Question

What you often find with old cement is that part of it has hydrated but not enough for you to see clearly. It looks OK, but you might have to use 2 or 3 times as much in the mix to allow for the dead cement. If used for anything structural it's not really worth it, but i could be used for something less important such as the infill on a cavity wall foundation.
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Old 09-23-2010, 07:39 AM   #5
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Cement Question

Ok. Thanks guys
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