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/diy/ - Do It Yourself

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1166265 No.1166265 [Reply] [Original]

I've got a bag of "ready mix mortar" that says all you have to do is add water to use.

It says use by December 2009. Is there any chance that it is still usable in 2017?

It's been kept dry and has the consistency of fine sand

>> No.1166281

Yes. The physical and chemical properties of sand and cementitious material will not change.

>> No.1166282

>>1166265
If it is still dry and there is no bulbs of dried out stuff in it, yeah, it will be fine.

>> No.1166283

>>1166265
If it's for important structural shit, it's not worth it. If it's more for decorative shit you can always test out a small sample by mixing it with water in the correct ratio and waiting to see if the cement will still give you an exothermic reaction, then set and cure properly. You really never know with the old bags. A tiny bit of humidity can get in there and ruin it very slowly over many years and it looks perfectly normal dry, but since the silicates are chemically spent you get a shit ass reaction and it won't bond together well. So yeah, maybe. Test it out first. Don't just use it for a projerct. It might still be good, it might not be. Safe bet is always a newer bag.

>> No.1166287

>>1166265
for fuck's sake no. it's fucked.
the shit's only five bucks a bag anyway. what's it gonna cost when your wall falls down on some cunt?
fucking jew idiot.

>> No.1166289

>>1166281
>>1166282
Sorry, guys. I've had old bags of mortar and plaster that looked perfectly fine, dry and not clumpy that wouldn't set because of low levels of humidity over years. You can't tell until you test mix some.

>> No.1166292

>>1166287
Exactly. It's not fucking worth it in the slightest. If the bag expiration was like last year, yeah ok. But that bag's almost a decade past when the manufacturer thinks the shit might go bad. It's not a precious material, OP.

>> No.1166297

>>1166292
>>1166287
>>1166289

What these said. Use it for patio ballast, decorative things or fence posts. Its probably fucked

>> No.1166312

>>1166265
The reason that cement now carries a 'manufactured on' dated and a 'use by' date is because of the Chromium (VI) Directive (2003/53/EC).

This Directive (Law) was issued in order to minimise the risk of allergic dermatitis from the use of cement.

The 2 month period is due to the use of additives in the cement to reduce the production of chromium (VI) when the cement is mixed with water. These additives become less effective with time and it is considered that after 2 months it cannot be ensured that the chromium (VI) levels would be beow 2 parts per million.

>> No.1166315

>>1166281
>>1166282
If it's hydrolyzed, it's worthless. Mortar & plaster will happilly absorb moisture slowly but surely, and very slowly, quite happily.