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#922532 - 09/10/17 06:21 PM Does Cement Expire?
jigs Offline
veteran

Registered: 11/05/04
Posts: 1289
Loc: New York
I used a very old bag of mortar cement to fill some cracks. The bag had a few clumps of somewhat stiff material near the top but there was plenty of fine powder mix below, which I mixed with water to make a thick paste. The next day the left over cement was dry but friable, not a rock solid chunk of cement. The cracks also set up but I could dent it if I pressed hard enough.

Was the cement too old - did it absorb microscopic moisture to render it not chemically viable anymore? The leftover mix was not overly wet.

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#922606 - 09/12/17 03:01 AM Re: Does Cement Expire? [Re: jigs]
artbuc Offline
Handyman

Registered: 02/15/04
Posts: 812
Yes, it absolutely does, even when well sealed stored in the basement. Over time it can hydrate enough to kill it even though it looks ok. Just experienced this myself earlier this year. Google and you can find more technical explanations.


Edited by artbuc (09/12/17 03:02 AM)

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#922673 - 09/12/17 07:37 PM Re: Does Cement Expire? [Re: artbuc]
JimTheTinkerer Offline
" Humming Bulb "
Carpal Tunnel

Registered: 03/24/03
Posts: 22400
Loc: US
Yes indeed....despite what the clerks tell you.
Lime turns to chalk as CO2 creeps in over time...
and then it can't generate the super-high PH you need
to dissolve the silica and make strong cement.

Heck, even a little too much water will do that.

----------------
Another myth:
when a foundation goes below 40 degrees it doesn't
'get better again' when it rises again...the cure is
spoiled. The industry guidelines say so.
Most contractors aren't around when too many cracks
crawl through the slab. .....chalking again.

Better to speed up a cure than say it'll fix itself.
You lose a lot less strength.

_________________________
"Pay no attention to the man behind the curtain!"
--The Wizard of Oz

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