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   >> Horn Depot

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14tokihorn
500+ posts
04/21/08 08:47 AM
How long for mortar to reach full strength?

I did some hardscape (technical term from diynetwork.com).

- Set some native slabs of rock on the vertical to form a terrace-like edging for a new plant bed, and applied mortar in the joints and the trench for an informal footing

Some of you in the know - is 48 hrs. enough time before I start putting soil over the mortar joints and the make-do footing? I did this over the week-end, and it would be nice to have it hold up as long as possible.

Of course the construction technique says a lot about a sound installation, but lets not get into that

The mortar doesn't feel cool to the touch this morning. All I know is this indicates that the moisture is getting out.


What do ya think?

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l00pModerator
10,000+ posts
04/21/08 09:05 AM
Re: How long for mortar to reach full strength? [re: 14tokihorn]

It's a humid day today so that may affect it. But rains are not expected, even slight chances, till Wednesday. I would say that by the end of today. How much the humidity affects it, I don't know but I am pretty sure it will prolong it some. I know it affects paint drying.




You want this. You need this. You must have this. The Link

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jerich9701
25+ posts
04/21/08 11:35 AM
Re: How long for mortar to reach full strength? [re: 14tokihorn]

Mortar and all other concrete products usually reach 95% of their strength in 7 days. That being said and given that you want to add dirt behind it (dirt is one of the heaviest materials including concrete). I'd give it 3 days to set. We usually wait 3 days after a concrete pour to let equipment get on it. You should be home free after 3 days.




"... the Horns of the righteous shall be exalted." Psalm 75:10

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Thunderhoof
500+ posts
04/21/08 01:28 PM
Re: How long for mortar to reach full strength? [re: 14tokihorn]

Mortar, like concrete, cures. Putting dirt around the joints will probably help them cure more slowly, which is actually a good thing and will help with the strength of the mortar.

The thing I would worry about is how much you will actually be impacting your new rock work. If you are rolling wheelbarrows over the stuff and generally knocking the crap out of it, you should probably wait a few days before you do that. The three day rule mentioned above is probably a good one if that is the case.




Hook 'Em.

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TexasEd
5000+ posts
04/21/08 09:46 PM
Re: How long for mortar to reach full strength? [re: 14tokihorn]

Right, you want it to cure slowly for maximum strength. If it was 100 degrees out I would say cover it with plastic to slow it down. The dirt will help slow down the process. Just don't stress the mortar.




Dyson should sponsor OU sports

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AstroVol
1000+ posts
04/21/08 10:21 PM
Re: How long for mortar to reach full strength? [re: 14tokihorn]

Full strength/design strength, by definition, is the strength at 28 days.





I have received a few more small school offers," (Auburn commit Eltoro) Freeman said. "They have been small schools like Alabama State, Tuskegee and Texas A&M.

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BigWill
10,000+ posts
04/22/08 02:48 PM
Re: How long for mortar to reach full strength? [re: 14tokihorn]

Agree with Astro, but I would add that it gains most of it's strength in the first few days, then the rate slows quite a bit.

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14tokihorn
500+ posts
04/22/08 03:21 PM
Re: How long for mortar to reach full strength? [re: Thunderhoof]

Well, today makes 3 days. I could fill the landscape bed this evening. I've slapped the stonework pretty good, and so far so good.

Then again, if I filled now, then the joints would then have only one side against the added soil, the other side being open to air.

Sounds like the cement component actually has a chemical reaction in which water is required? Since a longer cure is better.
I mean, the mortar might seem solid (and it is) in this initial period , but chemically, what moisture remains in the mix goes toward curing? ...and the evaporation effect is the another factor working against the cure.

Anyway, I read the printed stuff on the bag... it did say that curing can be helped by misting with water, after such and such a time. That applies, as someone stated for real hot, dry weather.

... this is not a huge amount of dirt - I've got right at 3 inches per foot on the slope I want to fill in for a level surface. So the lowest edge will have 12 inches behind it (4 ft. total length).

I guess I could wet down the sides exposed to air, or does is that total overkill? its easy to do, though.



[edit] its Google time

Edited by 14tokihorn (04/22/08 03:39 PM)

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AstroVol
1000+ posts
04/22/08 03:28 PM
Re: How long for mortar to reach full strength? [re: 14tokihorn]

Concrete usually gains 70% of its design strength in the first 7 days.





I have received a few more small school offers," (Auburn commit Eltoro) Freeman said. "They have been small schools like Alabama State, Tuskegee and Texas A&M.

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