The Types of Concrete Cracks and how to prevent the cracks
ฝัง
- เผยแพร่เมื่อ 2 มี.ค. 2022
- It is Common knowledge that concrete cracks, and most people think there is nothing that can be done to prevent concrete cracks, but is that really true. this video covers the types of concrete cracks and how you can prevent concrete from cracking.
To some extent you cannot stop concrete from cracking, however, some concrete cracks you can prevent while others if detailed correctly can significantly reduce in size to the point where they are not visible.
It is important that in any concrete design you limit the concrete cracks as they can reduce the life span on a concrete building due to reducing the concrete durability and in the wrong place can reduce the strength of the concrete structure.
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Such a great video to use for studying for my Construction Materials course. Much appreciated!!!
Hi Ben glad that you found it helpful. Thanks for the support.
Thanks Brendan for very relevant topic. Keep going.
Hi Deepak, thanks for watching and the continued support.
Great video...😊❤
Very good summary, thanks
Thanks for watching and the support.
Can we have a video explaining curing for casting in-situ concrete, such as padstones for steel beams or load-bearing walls filling? To answer questions such as optimal way to respect curing phases considering onsite constraints, handling formwork for vertical/horizontal elements and time to wait before drilling to install anchors (i.e. tension/shear forces application)?
Thanks for all the great information nice video
Thanks for the support.
Great info as always
Thank you for the information
Thanks for watching and the support.
I'm also interested in the topic thank you so much I would learn .
Thanks for watching Kimmy
Was in process of buying a brand new house with LGI a day ago and when I saw the brand new house already had the cracks I was so scared because based on the reviews the house will end up having foundation issues.
I think it's crazy for a brand new house to have such issues.
Any advice? Thanks.
Brendan, thanks for sharing...
Brandan, as you may gather from my channel, I am crack crazy, interesting you talk about the tension failure, I also talk about this and have a backlog of videos on this subject; I am leading up to videos showing the load testing is defective, concrete beam testing is done on a non-pinned end connections and this alone makes it a defective test that we can use for strength capacity extrapolation...
Then we have the point loading to failure, to me, this would be good for determining shear failure but, they are not covering the interactions between multiple spans and balance stresses (rebar across a shear head for example)...
I know this is confusing to read +/- but, it is a very complicated subject.
As far as the surface and bleed water; I like to tell people that the ingredients are like a soup and once the aggregate settles to the bottom of the 🍲 pot, it displaces the water in the soup to the top (bleed water), just like in a soup (you mix the ingredients and you have a nice mix but once the soup stops being mixed, it takes a while for the slump interaction to displace each other (the agregates come to "rest")...
The evaporated bleed water is on the surface, and "not for free" (bleed water displaces internal to some concrete paste and once evaporated leaves the "river of cracks" (crazing, etc .)...
This is why it is to have a "stable soup ingredients", one that has the least amount of displacement, equals low slump/w.c.ratio.
We also have cracks from the heat created during the making of the final set of the mortar (notice, I did not say concrete = thermal reaction happens in the mortar BUT, is increased and decreased based on water temperature, ambient temperature (exposed area of concrete), stone temperature, sand temperature, other additive temperatures, ground surface temperature and of course if plastic is used on the base (forcing all bleed water to the surface)...
Compaction of concrete was done back in the day and higher slumps were used for placement... the compaction forced the soup ingredients to the bottom and the water to the top (it was literally scrapped off and final elevation was evaluated)...
It was a skill to get your elevation correct with the compaction but it allowed for speed in placement of concrete and also kept the materials cooler on those hot days, with the extra , initial water added for placement ease (think of all those 1930s sidewalks in New York that are still not cracked yet; had high water content and minimal air entrainment).
This is my incomplete, short version.
Hope it sparked you up and looking forward to your next video.
Kai
PS Brandon, remember, Newtons third law... the tension is not linear...
Hi Kai, thank for your detailed response, alot to think about. I had seem some of your previous videos, they where very interesting. Thanks for the support.
@@BrendanHasty , I enjoy your content myself... I can learn from your style but, I am afraid my Philadelphia personality is ingrained...
Brendan, I hope this video explains the reactions I am referencing and please read the description, it has more details...
th-cam.com/video/RRhKepMFqhM/w-d-xo.html
and looking forward to your next video.
Kai
Thanks
Your welcome
Hey Brendan, nice video as all ways. I’ve been watching your channel for a while and I’m always learning something new from you. I’m a high school senior aspiring to be a structural engineer and I wanted to ask you a question regarding learning more about the structural engineering career field on your own. Do you know of any good books/websites that explain more on what structural engineering entails, it’s past advancements, the way the business operates maybe and even emerging practices. I was just curious. I’m only in trigonometry right now so I’m pretty sure I shouldn’t read something thats overly technical just fyi. 😅
HI Joel I have some books linked in the Discription, a great publicication for stucture engineering is IstructE it a UK bases orgsation.
@@BrendanHasty Thank you Brendan. 🙏🏽
👍🏼👍🏼, these crack control measures are good practice to help prevent future corrosion problems, especially for elevated slabs.
Great lesson on the various type of potential cracks associated with concrete curing. Great job as usual.
Hu Victor simple practices can help alot to improve durability of concrete structures.
Thanks for the support Malik.
Look at InfrastructureTek based in the US
You don’t want to pour anything more then a 5” slump if it get to you on a 3” slump u can add water
Hi Brendan.
I hope you are doing good
Please make a video and make list of topics. That structural engineer need to cover .. Like starting from Shear and moment.
Just make a list... It will be very helpful.
And how can i talk to you. I want to discuss and get suggestion from you
Hi Fahar, I will make a video on how to scheme buildings this should help alot on things you need to consider. If you want to contact me more typically this is through patrion.
bruh i wish i could just have a talk with you and ask every single question I've got regarding all topics of structural engineering.
Hi there will be a upcoming QandA for 25k subs look out for the community post
Please do you any suggestions about the book that has information about RC STRUCTURE or the topic of today
The concrete institute of Australia has good resources on these topics. Also have some links to books in the description.
Is there any chance I can send a few pictures of my new concrete. It has a lot of cracks that started within the first week. I would love an opinion on the quality of work
Hi Craig, you can join my Patreon (www.patreon.com/BrendanHasty) or membership (on my home page) to discuss a specific matter. Thanks for your support!
Hi Brendan. Great video. Appreciate the content. Being an aspiring structural engineer and early on in the field I would love to connect with you and request for some advice on some topics in design I have been struggling with if thats okay?
Rohan Sar
Hi Rohan, my Patrions get to ask me questions all the time, otherwise feel free to ask questions on my videos. Sorry I am just very busy all the time.
@@BrendanHasty Hi Brendon. Sure. How can I be a patrion? Do I need to sign up or get a membership?
@@rohansar8161 you just meed to go to www.patreon.com/BrendanHasty I am about to launch youtube membership, which will be the same thing. I prefer you to signup tp patreon as they take a smaller cut.
How common is it in domestic construction for builder to be putting up frame without curing concrete much (or at all) ?
Hi Panfon depending on weather you many not need to, or a curing compound Is added. But typically some form of curing in early stages first couple of days to allow for good finishes
aggregate does not shrink though ?
how do you do saw cuts to minimise shrinkage cracks on a suspended slab?
Hi J C you don't saw cut suspended slab. These are temporary or permanent movement joists. Just need to be located to prevent restraint.
@@BrendanHasty what if you need continuity throughout the structure? do you just design to be simply supported in the temporary construction stage with staggered pours and pour the continuous portion after 28 day shrinkage?
So, what the treatment plan when you see the concrete creaking in the old building?
Concrete doesn't creak things attached to the concrete does.
@@BrendanHasty so, do something for looking and comfort of cooling and heating?
⭐️⭐️⭐️⭐️⭐️⭐️
Pls answer linkedin
Hi sam will do sorry I have been very busy.
Please, check your LinkedIn.
Thank you.
Hi Vikas I will check it out sorry time poor at the moment.
I’ve mastered driveways. It is possible to get zero cracks.