That's was awesome. Animation makes super easy to grasp the fundamentals quickly. I would request you to make videos on GGBS and why it can't be used as 100% replacement for making concrete.
I am glad you like it! I have some videos on slag. Here is one: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-0wOCn7smmIs.html Here is the other: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VOIq5SFDWvc.html Slag needs an activator to make it react. That is why we mix OPC and slag together. You can use slag at 100% replacement but you need to add an alkali activator to the pore solution. This is called a geopolymer. I would suggest trying 80% slag and 20% OPC. For some applications, this is a really great mix. This material can have problems with carbonation and so watch out!
I'd like to point out that it sounds like this is only a problem if we are using iron rebar. It sounds like the concrete is stronger so if we use a different reinforcement maybe we can eliminate that problem.
Very nice and well explained video! However, I would like to notice something. You mentioned that the biggest concern in geopolymer concrete is carbonation. I think you are might referring to alkali activated materials which are NOT Geopolymers. The carbonation of geopolymer concrete does not affect the pH. It yields K2CO3 or Na2CO3 with a minimum pH of 10-10.5, which protects chemically the reinforcement against corrosion.
Boulder Dam was completed in 1935-- ancient and done without computers and knowledge now available for cements. Should we be worried now about 84 years later that the concrete used will deteriorate and fail ??
sir the video information is too good and very usefull information please make a video regarding carbon cure and solidia measure to control carbonation.
My house is entire lime+clay mortar-plaster & lime concrete with teak wood infused.. i plan to build new lime house but concrete??? Lime + zinc gal steel bar + traditional mix (jaggery+ haritaki) etc herbs and zero cement is possible or ...??? House with 40 - 50 yrs life span is ok for me but i need complete lime house for fresh inside air + other health reasons... Teak is very very expensive than FRP... KINDLY ADV...!!!
Yo amigo first I like to thank you for your videos. I been in this business for 15 years and I actually work for the company that was on the i35 bridge that fell but I would like to point out that all epoxy coatings on all rebar is applied with out any prep any other industrial painting is done by first blasting steel so it has a profile something for paint to grab on to it no wonder epoxy falling off it kinda stupid and it that simple
Normally don't even click thumbnails that look like this, but your info is better than expected - thanks for putting it out there. CarbonCure has to give carbonation a head start, and they seem to sidestep the subject. In 50 years maybe we'll know if it mattered. Fresh concrete does lose some slump with CO2 injected, but not much different.
Thanks for the comment! I have watched your videos in the past and really like where you are headed. We should talk about a collaboration sometime as I am a concrete bubble freak. I have a bunch of videos on the topic.
Thanks for your responsiveness. I have to think about presenting the term "spacecrete", because the material is essentially regular concrete - can have air or not - but it "defies gravity" regardless. Excessive air makes it way easier to do that, but a lot lot weaker, and so only incidental air from injected thickeners is included. But many people think it is aerated cement because of the name. Last break was 4400 psi. 3D print people tell me that their mix is 8x the cost of concrete, plus labor/equip of onsite mixing. We inject admix at
Another noob dumb question. Why not add anode rods to the rebar like they do for maritime steel? Seems like the process in concrete is much slower so the rod would last decades. If you had an exposed bit of rebar you could even replace the rods. Just curious. Thanks
Just make good concrete! That is half the battle. Consolidation, curing, and excessive w/c ratio are problems most often created by the contractor. My experience is that it is far more difficult to be a ready-mix supplier, than a concrete contractor.
Jeff, I agree that making good concrete is the key. That is what I said at the end of my video. You are right that every step in the process is critical.
Tyler, great video as always. I love how your passion comes out. You truly are a freak for concrete, in the best way. How would ground water seepage relate to the carbonation of concrete? Assuming some CO2 is dissolved into the water as it falls through the atmosphere, and then more CO2 is added from the soil, would ground water seeping through cracks or pores greatly accelerate the process? What is more damaging to concrete, water vapor transmission or liquid water absorption?
Great video. So the amazing concrete trusses and other sophisticated support elements relying on pre/post tensioned steel are doomed due to gas infusion, no matter the weather??!!
Thank You Mr.Tyler for the concise explanation. anyway, is there any correlation between carbonation and chloride penetration especially concrete structures located in coastal line? Which phenomenon has more detrimental effect for concrete?
"Some rust on rebar is good" I've often heard. The rebar I get from my local yard often is already rusted somewhat. Could you address this issue? Is "some" rust good? And how much is "some"?
Amazing chanel, just descovered it in time for an exam :) Could you do a video on the effects of alkali (NaOH or Ca(OH)2 for example) on concrete, i cant seem to find much on this topic. Cheers!
What about zink anodes, with copper wire welded to the cage. like the hudge zink blocks we dropped in the bay attached to a warf. four hundred to five hundred pound blocks, every 20 feet or so along a 1100 ft warf. its been about 12 years. are the zink blocks still protecting the steel rebar? My boat eats zinc anodes like candy. also. a Hot boat Dock or Warf with leaky power. eats up zinks faster.
Someone at U of Arizona has introduced addition of Iron in the mix and the elimination of cement altogether with I introduction of CO2 and water. States the product has strength equal that of concrete. Could you comment on that, please?
Tyler.... I am researching the use ICF Insulated Concrete Forms. Naturally comparing wood frame longevity to concrete. Combining the use of FRP rebar or Basalt in this application for residential construction appears to be a step in the right direction. I am curious with regards to what effect if any the insulated forms might have on slowing carbonation and therefore increasing the life of the concrete? Any thoughts or research in this direction?
I have a question. If you made a structure out of self compacting concrete with micro and macro glass fibres with steel fibers as well and used fiber basalt rebar and then made the footer out of self compacting concrete with macro and micro glass fibers and fiber basalt rebar and just left out the steel fibers wouldn't this type of structure take the best advantage of this enivitable process?? You would have a ductile structure attached to a non ductile footer and over time as the process unfolded there would be corrosion in the structure but none in the footer even if all of the steel fibers eventually corroded the footer would effectively become stronger due to the process and the upper structure after losing all of the steel fibers would become less ductile but also less dense making it easier for the now stronger footer to support. I'm considering building a house and watched almost all your videos on concrete and this was the ultimate direction I was leaning. Is my analysis correct or am I missing something? The point would be that I'd get a structural trade off over time. I would lose ductility but gain strength and the strength ratio between the footer and the main structure would be increased by never having any steel fibers in the footer to begin with that way the slight density loss in the main structure would add to the total ratio of strength gain. So I lose a structure that can be ductile over time but eventually it would just become like a giant artificial rock with the denser rock being the footer. Am I wrong here?
Thanks for the hard work and funny way to explain all of these boring topics.. It works for me, man! Can we use liquid densifier eg sodium/lithium silicate to help to reduce the AAC problems? Which one is more effective to fight those problems, liquid densifier vs penetrating sealer (eg. Silane, siloxane, siliconate)? Since both products increase concrete impermeability (in different way).
Tyler, I would never dislike one of your videos, but this one is annoying because of that trendy editing you’ve done. You know, cutting the video after every sentence, the starting again. I like the lecture style videos much more. Please keep sharing your knowledge, as I’m fascinated with the content.
Hi Tyler. Thanks for your video. Im a subscriber. How about aircrete used for walls. It floats meaning water wont penetrate it. What do u think about it used for walls. Its mainly used for insulation not to.carry weight. Can u make a video about it. Thanks
CO2 being absorbed out of the atmosphere is NOT a green thing, because the CO2 in the cement raw material was cooked out and released into the atmosphere when the cement was made.
It is better than not being absorbed. Can you think of any other material that absorbs some of the CO2 that it released? =) I am kinda kidding because I don't think the amount that it absorbs is very much. Thanks!!!
@@TylerLey Ultimately, the amount absorbed is equal to the amount released when the cement is "cooked" (that is the primary reaction in the kiln other than dehydration). But the heat required for the kiln is usually made by burning carbon-based fuel, so even with the after-absorption, there is a net release of CO2.
Hi! At 2:44 , you are telling that corrosion will begin at pH = 10. But, in color test, acidic condition (clear color, pH below 8) is responsive for higher corrosion. Could you please explain the confusion here? btw learned a lot from this vid. Thanks!!!
What’s the confusion? That pH test just so happens to change colors at 8. It’s not exact but close enough. Any pH starting at 10 and below causes corrosion. The lower the number, the more acidic thus more corrosion.
So what's going to happen to the big concrete dams🤯. Hoover dam failing damages the entire United States. Man, you've ruined my sleep. How much would galvanized rebar help? What about complex environments where salt can be carried in the air... wouldn't that percolate into your voids and wreak even more damage??
I think that your ability to see into the outcome is important but the ability to look at the end and begin again is hidden in many structures city buildings bricks falling off walls etc which leads me to think of how primative we all really are
Idea, use CO2 to make the bubbles in aircrete. if the bubbles are evenly dispersed and the CO2 is good in thin layers, then you should have a superior product
@@TylerLey Tyler Ley I want to play with aircrete. I intend to build a house sometime in the next year and I'm looking for the cheapest way to do it and still have a sound house. I think aircrete is my solution. I've been watching honeydocarpentry, he's building a shed from it and has made some really effective aircrete and I'm just wondering if there is a better gas to use than raw air. Obviously oxygen would be bad. I'd like to see if using hydrogen would be a combustible product or if do to it's low density would it provide and easier spot for carbon to squeeze into and keep it sequestered away from the material. Or possibly helium. I don't know if using helium is economically viable. I really don't know anything about all of this so I love the fact that experts are on RU-vid to explain as much as possible and provide their experiences. Can you give a guess as to what other gases in your aircrete might do? Is there one that might bond with co2 and keep it out of the mix?
Thanks for the comment. Actually, fly ash can make it worse. Fly ash consumes the calcium hydroxide to form CSH. This reduces the buffer but makes it harder for the carbon dioxide to enter. It depends on how much fly ash you use if it is worth it. More than 40% replacement is questionable.
When I watched this video, it reminded me to ask what happens if a concrete mix is degassed (by vacuum) and then pressurized and air entrained with a specialty gas mix. For instance, injection with argon, krypton, nitrogen, or potentially some self healing reactive mix maybe. I know that temperature regulates how much oxygen is in water from learning about Aquaponics (a hybrid between Hydroponics and Aquaculture). And when thinking about these things, I try to find weaknesses to what I ask and possible counter actions. For instance, a more stable gas entrained may slow down or stabilize pH reduction but become a health hazard in confined or enclosed spaces if too much is permeated, unchecked into a death zone (perhaps due to design oversight to incorporate capture zones and proper work controls). So I ask, anyone, what insights, knowledge of case studies, or observations you may have to share. I find this "what if" interesting and appreciate whatever may be shared. Thank you
LoL, you geekin' out, yea sure all we gotta do is hire people w straws to blow you krypto gas into wet concrete. Go sweep a floor, you'll be a great janitor
Once again-- only an issue with OPC. Invention of Portland cement was actually due to a search for a hydraulic cement ( all traditional cements available were C02 setting mechanisms ). As such, they get stronger as they absorb C02 as opposed to being degraded Several traditional cements have this attribute -- as well as having as much as a 92% less carbon footprint than OPC All concrete in America poured before 1875 was not OPC. The first load of Portland cement came into Boston harbor in 1875 The fact structures like the Erie Canal , Brooklyn bridge, etc were not OPC is why they have lasted so long Your remark about Geopolymer and carbonation is entirely erroneous