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Concrete pad curing time for load
Posted on 10/10/20 at 4:04 pm
Posted on 10/10/20 at 4:04 pm
Poured a 2x4 pad around 5”to 6” thick for an outdoor fireplace. Weight of fireplace is 1300lbs. The weight is carried along the edges of the fireplace as the center is hollow. The base of the fireplace is 23”x47”. How long should I let the pad cure before putting the fireplace on it, weight carried in edges?
ETA poured pad on Tuesday, no steel.
ETA poured pad on Tuesday, no steel.
This post was edited on 10/10/20 at 5:03 pm
6
Posted on 10/10/20 at 4:24 pm to jmon
When you can walk on it put the fireplace on it.
This post was edited on 10/10/20 at 4:27 pm
Posted on 10/10/20 at 4:25 pm to jmon
Depends on concrete strength/additives and reinforcement....
Posted on 10/10/20 at 4:34 pm to jmon
depends on psi of concrete poured and psi of load exerted upon it
Posted on 10/10/20 at 4:36 pm to mack the knife
80pound bags of standard quikrete.
Posted on 10/10/20 at 4:38 pm to jmon
Wait till next week
Posted on 10/10/20 at 4:42 pm to mack the knife
This fireplace (based on the load given) isn’t any more weight than a person walking on the slab.
Posted on 10/10/20 at 4:42 pm to jmon
if i was at my office i would post curing strength curves. its pretty cool how fast you get to desired strength and how parabolic the cure curve really is.
Posted on 10/10/20 at 4:54 pm to Possumslayer
Poured on Tuesday. So wait 10 days?
Posted on 10/10/20 at 4:58 pm to jmon
10 days should be fine. any steel in it?
Posted on 10/10/20 at 5:01 pm to mack the knife
No steel.
Posted on 10/10/20 at 5:15 pm to jmon
Next weekend you have a project!
Posted on 10/10/20 at 5:43 pm to jmon
7
Posted on 10/10/20 at 10:05 pm to jmon
Concrete reaches its design strength at 28 days. Typically construction requires 75% of the design strength to be achieved before loading a foundation.
Pretty sure basic Quickcrete is 3,000psi strength. If I assume the edge of fireplace is 3 inches wide and all the load is over 23 inches that’s only 18psi. As others have said, once you can walk on it, you should be good. If you are worried, wait 7 days.
Pretty sure basic Quickcrete is 3,000psi strength. If I assume the edge of fireplace is 3 inches wide and all the load is over 23 inches that’s only 18psi. As others have said, once you can walk on it, you should be good. If you are worried, wait 7 days.
Posted on 10/11/20 at 7:01 am to ABucks11
Thanks for the responses. Planning to clean and paint the fireplace today, which requires disassembly, so will put it back together on the weekend. I’ll be at 10 days at that point. And to your point, the edges of the fireplace are approx 2” thick, to carry the load where they meet the concrete.
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