Thermal Cracking in Reinforced Concrete
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- เผยแพร่เมื่อ 14 ต.ค. 2018
- Thermal cracks are a nuisance. They can ruin a well-designed concrete project if they are not designed for properly. This video is going to explain two types of thermal cracking. The first is caused by changes in temperature for large concrete members. These structures move from the increases in temperature and this movement can cause stresses that cause the concrete to crack. These cracks can be avoided with proper detailing. The second kind of thermal cracking occurs in mass concrete elements. These are elements where the minimum dimension is above about 5’. When these mass elements are cast then it takes a long time for the heat to dissipate in the center of the element. If the forms are removed too quickly then this can cause a temperature gradient that will cause surface cracking. The video discusses the variables that can impact this and also talks about the concrete works program developed by Texas Department of Transportation. This is a free software package that predicts the performance of these mass concrete elements for a large number of variables.
You can download concrete works for FREE here: www.txdot.gov/business/resour...
Thanks to Hailey Goodale! She edited this video and is my Director of Awesome.
My website is:
www.tylerley.com
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Love this. Looking and staring at walls has never been such a beautiful way to spend my time. Perspective change. So beautiful. Arghhhhhhh. Concrete rocks!
Thanks Dr. Tyler for making this video
Thank you for the message!
This video is really helpful. Thank you so much ❤️❤️
Sir please have a full videos showing design of a building from load calculations to the finished design it will be a great help
Love your insight thanks!
Oh my god !. You are amazing ❤️
We actually used this method for the concrete water irrigation canals in morocco to avoid arbitrary cracking. Thanks for the video dr Tyler.
Thanks Hamza
Tyler, thanks for all the wonderful info on concrete!
Have you considered a talk on ICF?
Really appreciate
U r a great sir
Another great video... keep them coming buddy... roughly 10% of psi for tension failure... of course, on a solid surface this is negated... (depending on loads applied)... 4:08 he said, the ''size of your member" ... haha (could not resist).
Thank you! Glad you like the videos!!! Your right that 0.1f'c is a good estimate of the tensile stress.
Good information
It’s really annoying especially when using Architectural Concrete.
Thank you for the valuable video.
Thanks Ayman!
Great video Tyler, do you have any suggestion on how to control cracks on small concrete pieces (mug size)
Im trying to make candles but it seems the heat of the flame tends to crack the concrete severely
Any advise?
Hi Tyler i poured white portland cement today in a glass container about 16" high and 4" in diameter its for a ( diy) making lamps a few hours after i noticed the vase heating up so much that i imedialetly put a 12 " fan on high mode next to it to COOL it down....it worked thank god ! i thought this thing would explose...
Question: is there another way to cool it down ?
if any of your Sub.... no or have any tips it would be much apreciated ....Thanks and keep those awsome tutorials coming...✌️
Dr. Ley,
Could you comment on Geopolymers and its erroneous classification as a type of AAM.
Dr. Davidovits might have something to say about this; so you are put on notice!
I would love to hear your take on the hoover dam wall build in the 1930's
Also consider when doing columns - make them hollow instead of solid. It can save material and weight to make the columns hollow too with little impact on the structural strength. A slightly larger outer diameter can compensate for that and you still save material.
Good idea! The forming is a little more complicated but I like it.
Hello Dr, have or will you make a vid on lightweight aggregates and internally curing concrete? It seems extremely fascinating.
Thanks Adam,
I talked about it a bit in this video: th-cam.com/video/8XApTsnDmgY/w-d-xo.html
There is a lot of good stuff out there on the topic. Try searching for Jason Weiss internal curing on TH-cam. Jason has done a lot of work on the topic.
You talked about heat of hydration and environmental temp rise. What about meltshops location where there isn't any refractory bricks but still spillage of molten liquid happened. Can you explain this phenomenon? please ✌️
Dr. Ley
What dimensions would you consider “mass concrete”?
ACI 207 is vague.
I know dams are for sure. But what about a pour of 6ft deep x 5 ft wide * 100 ft?
Just to try to avoid horizontal joint
I know slag replacement is key there.. we will do that.. but the “mass concrete” special requirements?
Thanks
Trying to make a rocket stove out of a 5 gallon bucket and a 4 inch PVC pipe. So what kind of mix should I use. The only recipe I found is 80% perlite to20% Cement. Do I use quick Crete or Portland cement and how can I keep it from cracking.
How do you control cracking in a 30X 60 slab?
In designing anchor bolts in slabs, the ACI shows the design of anchor bolts for shear and tension failures, however the design equations gives the option of designing using cracked or non cracked concrete. The problem is that no definition is given for the terns cracked or non-cracked. Can you explain the difference?
Cant able to download that softwear could u please provide the outher way. Rather than website
Hello Dr. Tyler. Where can I find this recommendation on the literature? (Min. Dimension up 1.5m) thanks
Hi Dr. Tyler, what about when you a have a wall with control joints every 6m but it just doesn't crack at the control joint? Is it because the control joint is too far apart?
yes
How do you determine how often to put crack inducers in concrete walls?
Good question and there is not a great answer. I would suggest < 20'. It depends on the mix design, the foundation, and the amount of reinforcing steel in the wall.
I’m in the sky rise Hotel And the cricket and crackling from the windows 🪟 But I’m in a hot country Brazil with my air-conditioner on is it normal
Here is a finite element simulation of thermal damage in concrete: th-cam.com/video/awSscnUXDKU/w-d-xo.html
I have experienced thermal cracking on my member... or maybe that was gonorrhea
Size of your member? Lol cmon