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838 Comments
Top Comments of this video!! :3
I dont have the answer, but I love that you asked for advice rather than hide the issue. Respect.
839 |
Concrete guys would be actively mad the ice was on the bolts and not the beer
520 |
Your concrete is evaporating quickly, so to counter the cracking, you'll need to
1. Soak spray your plywood forms before the concrete is poured.
2. Buy a spray container where you fill with water and pump pressure into it to spray the water out.
3. Once you insert the "j" bolts into the concrete spray water directly over the bolt.
4. Cover your forms with plastic to prevent water from evaporating so quickly.
This will allow concrete to cure properly and water will prevent the cracking.
P.s. make sure you give the bolt a 1/4" turn after inserting. Good Luck!đ
781 |
If it's really hot it could be curing a bit too fast. Keep it soaked and that can prevent that. If it still occurs it's most likely due to a negative bending moment in the span where the heavy corners are settling creating tension in the upper portion of the wall. You can usually avoid this by adding rebar horizontally about 3-4" down from the top. This will help handle the tensile loading.
47 |
a)Do it early in the a.m.
b)hose down the forms.
c)put a tarp over it until tomorrow.
Should be all you needđ¤
18 |
I pour concrete walls for a living-
A wall is just like a floor stood up. On floors you install controll joints to controll the cracking from the cureing/shrinking process.
Its the same for walls. Install a piece of chamfer every 15 to 20' to controll the cracking and dont add to much water into the mix.
The crack at the bolt is just the concrete shrinking and useing the bolt as a joint to crack off of.
Ofcourse slowing the cureing down will help aswell.
64 |
Hair line cracks typically are caused by adding too much water to the mix and when it dries it causes shrinkage causing cracks. Those cracks will happen at weak spots in the wall and that being your anchor bolts. In very dry climates your forms should be well oiled and when your pour is complete cover the top of the wall with wet rags or burlap. Keep the material wet until the sun comes off the wall and your cracking should be remedied.
14 |
Those bolts are going to thermally equalize with the concrete long before it sets
191 |
You're a credit, most wouldn't give a damn.
91 |
Issues could be drying too fast, due to the heat.
Try spraying water on it, until there is no direct sun
244 |
Host of factors. But wetsetting bolts is a big part of it. Drill holes in formstakes and have the bolts suspended in the pour while placing the concrete. This way the concrete gets vibed in around the bolt instead of the bolt being an intrusion into an already distributed medium.
1 |
It's surface tension cracks. Cover the top of the forms with foam board to slow evaporation and balance cure rate.
1 |
cover in burlap and wet. that's what is done on bridge deck pours. i used to work for the DOT, another common practice is for bridge deck pours is to pour EARLY early.. like at 3am. it helps to prevent random cracking, and is done much earlier than mainline interstate pours because it doesnt have the ground to help regulate temp during curing.
1 |
I kept spraying mine with mist an hour after drying for two days, strong as diamonds. You could cover them as well and not let the sun cake the surface while the inside is still soft. I've seen walls get ripped two inches from intense sun heat.
8 |
Depending on when your wet sticking your bolt, the concrete mightâve started drying, and you created the stress crack when you push that bolt or rod into the concrete it would probably be better to do that while youâre pouring and vibrating. Iâm assuming youâre 1â to 2 inches from the edge of the outside wall for your seal plate. Also, youâre removing the forms the next day. Youâre definitely not giving it time to cure out so the moistures releasing fairly quickly unless youâre spraying it with a membrane.
11 |
Itâs because of the heat. We usually start pouring super early on hot days. Say 5am, Iâm in Colorado. The guys in Vegas pour 2am. Anyway vertical hairline cracks are not a concern, in fact they are totally normal. Unless they start to separate, I wouldnât worry about them.
1 |
I'm not a concrete guy, but I heard that under hot conditions, like there was when they built the hoover dam, concrete tends to get so hot due to the outer temperature and the heat from the reactions within the concrete, that it dries too fast and tends to build cracks.
For the hoover dam, they mixed the concrete not with normal temperature water but with iced water, so the concrete started heating from a lower temperature. This gave the concrete enough time to solidify without cracks.
1 |
Were you spraying form oil inside the forms or wetting the inside of the wood forms ? Cause if the forms are dry its going to suck all the moisture out of the concrete.
18 |
It should make the concrete set slightly slower (hot bolts made it set faster) than the surrounding material. Soft material around the bolts wonât crack as material hardens around them, or as that material finally sets. I think it will work!
15 |
@redpi11krypto
5 months ago
The concrete is seting up too fast, cause of the heat. We always put burlap on to the top of the walls to hold the moisture and soak them with water as much as possible for 24 hours. And keep your forms on for a few days. The longer it takes to cure the better chance you have of it not cracking.
378 |