Thanks so much!

Thank Chintan! I am glad the video helped. There are more videos about shrinkage coming but these occur after the concrete has hardened.

@@TylerLey yeah i got that

Thanks Patrick!

Here in the hot summer, we sometimes "make hay" when the sun isn't shining by pouring larger slabs at night when the temps are cooler. Hard to find guys to work that schedule but they're out there and most of them appreciate working in the cool instead of the sun.

Pat Konelectric you crysy amigo...... chcahchacahcha

nebraska summers , hot and high humidity ,,., ranch basements are an oven,., crack as your finishing., at least we saw cut it., seen new basements in other states were they just let it spider out..//. ugh

Ya man I agree. Here in Wyoming it's hot dry and windy or snowy windy and freezing. We would have no concrete if we waited to pour. Tyler's videos have helped me understand the problems and how to address them. Thanks tyler

Fred, Thanks for the tip. I love hearing about what works in the field. Can you tell me more about the rubbery slabs? I need to better understand what you mean.

When power troweling a slab in extreme drying conditions, the slab will feel spongy or rubbery. The very surface of the slab loses paste due to absence of water, and a w/c gradient occurs going down into the first inch or so of the slab. The lower w/c in the top inch or two of slab will accelerate the set in the way that lower mix water always does. This results in a raft of semi-set concrete floating on a much more plastic base. The feel is identical too walking on the stamping pads used for embossing. Finishers end up working extra hard to trowel the paste-less surface while the floor is getting more and more wavy. As the thin already rigid top layer flexes, it will start cracking a lot and causing need for still more trowelling. If using riders, it is easy to have the rider suddenly drop through the surface and get buried. This is commonly first noticed around the second pass with the power trowel. Water is then usually dumped onto the slab to reduce the trowel friction/pull and to try to create paste. All theory aside, at this point, this is your only hope, but you will never fully recover. This situation is very much aggravated by pouring on poly, or using retarders in the mix to "help" you deal with the heat. The bulk of the damage is done by the evaporation happening while waiting for the first trowel. I strongly stress that replacement water needs to be almost constantly applied to the slab during this time. There is a way to do this carefully without churning water into the surface, but if guys are "too careful" it is easy to lose the evaporation battle. Evaporation retarders help, and some days are sufficient, but my experience is that they usually need to be mixed much stronger than label directions. If you have skilled crews, what I have found to be the simplest solution, is to use a hot or fast setting mix with enough set delay to allow for transport and placing time, and then have it go off. The finishers will be finished troweling before the slab has a chance to dry. Certainly, if you combine this with the above above mentioned practices, you can have very good results.

Fred - Thanks for the awesome response. You have more experience than I do about this. What you are saying makes sense. Because of the finishing, the surface is setting up before the bulk of the concrete. Let me think about this topic some more.

Thanks for watching!!!

Thank you!!

I wouldn't want to trap bleed water with plastic before finishing, but I do like a nice water cure after it's all finished!

Thanks so much!

Thanks so much!!!

Thanks Steven! I agree that the term plastic is weird. I tried to explain it in the video.

That sounds great.

I think I understand what you are saying. I like your idea about the span between the stones. We are doing some research on this topic and we can try to look further into this. Thanks so much for the comment.

Thanks for watching.

Glad you like it!!!

The trick is finding the right amount of pozzolan plus water reducing admixture

Glad you like it!

Really? Doesn't the water condensate inside of the plastic surface then?

@@sevvalkursun16 Yes, we want to prevent water to evaporate, plastic keeps the water in.

@@laurier3348 Yeah, it does keep water inside the plastic, but eventually water will condensate and pour down on the concrete again. Am I wrong?

@@sevvalkursun16 Yes and it is good that it pours down on the concrete again, isn't it ?

@@laurier3348 Oh, right!!! Lol, I just realized what a stupid qn I'm asking. Thanks for indulging tho! :D

Thanks!

Thanks for the message. I have been working on a video for fibers and I should be able to do one in the future. I am working on videos over concrete durability right now. =)

I know it dose make it harder to clean your concrete mixers out. I seen were they made the ready mix guys mix it in their trucks because of this.

Thanks for the question Check this video out! kzfaq.info/get/bejne/d76mis9-y7fPj2g.html

SRAs reduce the surface tension of the water. This means when the pores empty there is less pull on the walls. It might be helpful to watch my videos over shrinkage cracking. You can find them here: kzfaq.info/get/bejne/h9FliMRpls2ag3U.html

That would really help. Anything that slows down the evaporation at the surface will help.

I am playing with a new lighting setup for the videos I am shooting this week. I hope they are better.

mitzvos Golem lol

was inspector on stealth bomber for 2+ years site at WAFB, 25 employess under me ages 38 to 45 lol me 20 s early ahhahaa knowledge is power , unlimited budget heehheee got love the haters , brought my own crew i trained in dallas, every one i trained power hitter in ASTM , common sense inspections , real life testing not just lab fiction lol

what do u do when slump is 3 inch max on 8 ft x 12ft x 75 ft mono pour? in summer heat dry modified proctor ground , well not going to work with rebar 2.5 inches apart 1.5 in limestone..... nuke igloos too similar .... pours placements :) well its not ........?????? :) sensored for the pencil pushers lol, corp of engineers 5 years later heard my recomendation after modified protor not goinf to work on weatheread shale lol like sponge over time hydrauliclly lift the tiny 14 inch footing on 10 foot correction. got phone call inlaw suit, if u call me again will charge u 5000.00 usd this one is free lol go back in moblie lab last shelf is narrower than last , open it up if still got the trailer semi , yes, there was all my paper work soils samples, approvals for their screw up age 20+ winns lol dumb book following fools but JE Dunn loves me ahahhah

Hmm...I've been to Rome. I didn't see any concrete works the Romans built a thousand years ago that had hundreds of cars per hour, and 50 ton semis pounding over them all day every day. I guess I just missed them.

So now the cracking is caused by stress fatigue ? That's another factor ! Wish you'd have mentioned it before.... fact is, some of those Roman bridges and aqueducts are still in use today. All they did, was add volcanic ash to the mixture. That's a known fact, yet today's builders choose to add planned obsolescence instead, at my expense.

Pons Fabricius. 9Ponte Vecchio. 8Ponte Di Rialto. 7Khaju Bridge. 6Shaharah Bridge. 5Cendere Bridge. 4Anji Bridge. 3Ponte Sant'Angelo.....Roman concrete lasting and in use to this day, just Google it. Yet here in Pensacola FL we're building a new 3- mile bridge to replace it's predecessor, after only 30 years. And the new one, not yet finished, has already been exposed for shrinkage cracks. Why ? Profit- driven practices ! At your expense, Mr John Q Taxpayer.

I couldn't have mentioned it before, as that was my first response. I did check some of your examples, but I'm not sure why you used them. All of them are stone arch bridges or structures that maybe use concrete mortar. And the Anji Bridge is 100% stone, so I don't understand any of their relevance. Interestingly, I've been to a couple of your examples in our travels, they are brilliant examples of old world engineering and construction. The key to their longevity is as much related to well thought out geometric design as construction material. To your point, if you think that volcanic ash is the secret ingredient in concrete, it isn't. It`s not used today as volcanoes with commercial quantities of ash are hard to come by in North America, and the quality wouldn't be uniform anyway. Fly ash is used as a pozzolanic material instead as it has the same siliceous chemistry that adds strength and workability to concrete. You mention profit driven practices. All construction, be it highways and bridges, condos and houses, commercial buildings etc, is profit driven, it has to be. I imagine that when you go to work you take home a paycheck, so I guess you are profit driven too, at your employer's expense. I'm responding because I don't subscribe to the planned obsolescence conspiracy theory. Keep in mind that corruption in some builds is not an engineering failure. However, if you feel that bridges can normally and cost-effectively be constructed to last for 200 years of millions of car and truck crossings, corrosive salt applications or salt air, untold freeze thaw cycles, endless vibration, and remain standing while all those loads are on board during a magnitude 8 earthquake, then you've missed your engineering calling. Maybe you have the skills that others don't. Please, if you can find a concrete design bridge example as I just mentioned and as you seem to think is possible, anywhere in the world, just cite it, I`d love to see it. And no, I am not in any way involved in construction or the concrete industry.

If our structures were to just stand there and not bear any loads our concrete would last just as long.