Aggregates in Concrete Mix Design

This video talks about the role of aggregates in concrete mixture design. www.tylerley.com

[@Shadowfax2121]

Man, never thought I'd sit through a concrete class. Nice work Tyler, feel like I learned something (a lot!) today :)

[@roycevaughn4012]

Hey Tyler your videos are EXTREMELY GOOD resources for concrete science. Especially for a geeky concrete mason! Thanks so much for the free knowledge.

[@TylerLey]

Royce! Glad you like them. Thanks so much.

[@feder13]

@@TylerLey Hey Tyler, first of all, Tyler for president, second, what about a roof of cilindrical holes, has ever been done? is a bad idea?

[@khadarmohamoud8751]

Thank you Dr. Tyler Ley. God bless you and your family.

[@JV-ge8bm]

Your videos are beyond helpful! Just started working for my family’s construction company and love your channel!!

[@TruthofKashmir]

I used your content a year a ago for my presentation in college and I just topped my batch. Thank you Er Tyler

[@glenmisha]

Been wanting to learn about all aspects of concrete & today, I joined Ley Concrete Institute. Glad to have found you & your channel because you are certainly "ley"'ing it all on. Thanks for sharing!

[@animiztothepoint3156]

it was amazing. i also watched the video on air entraining admixtures and that was fabulous

[@gc6790]

Thank you for this lesson! I liked your explanation of the Max Nominal Sizes. From 15:37 It helped me understand why it says "90-100 passing" in the table, it's because 10% include the max size aggregates retained in there.

[@jackyeh7512]

We need someone like you! Great job!

[@kevinshaw5178]

These video's are great!! Thank you for helping build on and reinforce my concrete knowledge.

[@TylerLey]

Thanks Kevin!!!

[@andresmendoza9546]

Thank you for sharing your knowledge! Would you happen to have any experience with ICF cost, pros, cons?? Thank you

[@kevinshaw5178]

No sorry just a couple installations. Are you looking for a mix design?

[@johnfitzpatrick2469]

G,day from Sydney Australia. I appreciate your knowledge of the cementisous matrix ingredients, used as a modern building material. 🌏🇦🇺

[@kometa0017]

Totally agree on the percentage retained!!!!

[@azmibaryun9579]

🙏 Thanks Dr. Tyler.

[@shakejones]

you rock mate! well done! thanks for sharing!

[@seasonedtoker]

Wooow, this is one of the few vids where there isn't an Indian guy or an auto-generated voice narrator explaining it.

[@techHmrk]

Yeah whats up with all the asian people talking about concrete on youtube. Do they love it or what ?

[@pikusmaster]

Your videos about concrete are amazing! The only thing I wish that was better is the use of superior units - metric system.

[@cindytepper8878]

There was a company in Bucks County Pa that supplied sand,stone, and ready mix concrete called Warner. They mined most of their aggregates from pits near the Delaware River. It was all very rounded natural stone. I have no idea what the mix was or anything but it was some tough concrete. They were out of the ready mix business probably around 1970 when I was just a kid, but whenever we came across their concrete on a job and had to break it up it was tough to demolish. I remember one job back in the late 80's removing the bases of smoke stacks and our operator pounded on them for what seemed like forever with a 5 ton wrecking ball before they broke up. Even the sidewalks where I saw that aggregate were hard to break

[@TylerLey]

Thanks Cindy for the cool story. River rock and be very very hard and strong. I love to hear about people doing concrete right.

[@cindytepper8878]

@@TylerLey Do you think the aggregate is what made the concrete stronger than what we normally encounter? Typically what I see looks to be nothing but sand and crushed 3/4 stone. The Warner concrete had a wide variety of stone sizes in it.

[@piyushdadgal]

These videos are so interesting

[@liveyourbestlife1513]

Finally, a video that interests me! I am home.

[@TylerLey]

Thanks so much for watching!

[@liveyourbestlife1513]

@@TylerLey Keep up the good work. I met a gentleman last summer who was a professor in Dublin, Ireland while he was visiting Stanford as part of his research into creating environmentally-friendly concrete. He was a little embarrassed to start the conversation with the statement that his research was in concrete, but I just zoomed right in with interest. Good times.

[@ibrahimmetwalli]

Great job man

[@TylerLey]

Thank you!

[@wilsonruberti8609]

thank you. thank you. thank you!

[@sinclairconstructiongroup4844]

Great video, Tyler!

[@TylerLey]

Thank you!!!

[@EddieVBlueIsland]

Percent passing = cumulative distribution, Percent retained = particle size distribution.

[@majjood02]

Great video as usual.. thanks Dr. Ley! I suggest that you create a playlist with all your videos about aggregates ..that would be really helpful!

[@aby0ni]

Dr. Tyler, would be useful for contractors if I made a facility that uses multiple sieve sizes to separate the aggregate by size and then remixes them to order?

[@DeliciousDeBlair]

I must admit, I learned something in this video about the rules of maximum aggregate sizes! [not that I have not GROSSLY violated them in the past! ~( ,m,)~ ] (On one project I chucked a few large whole rocks into the form before to stretch my concrete, but the wall is only 24 high and was 10 inches wide, so it went okay for the purpose intended, it is not load bearing nor a retaining wall).

[@mfw6020]

It would be great if you can your lecture notes available, you are the best!

[@therakshasan8547]

I am looking for the MIX used in Municipal Buildings made durring the late 40's and 50's. Sometimes called Nuclear grade.

[@ssawwweW4180]

inspiring !

[@technosaurus3805]

This is a really complex mathematical problem (IIRC the Kepler conjecture?) that is masked by decades of experimental data and real world results. Its even harder since the aggregates have random shapes instead of spheres. I did find a couple of papers that used Monte Carlo style simulation to determine optimal sizes/ratios for non spherical aggregates. Packing of non-spherical aggregate particles by DEM By Piet Stroeven and Huan He And Optimization of A Computer Simulation Model for Packing of Concrete Aggregates By ADIL AMIRJANOV and KONSTANTIN SOBOLEV Something for an upcoming PhD student to consider.

[@KarasCyborg]

Thanks Tyler for putting this series together, I learned a lot of the lingo and understand some of the forces of making better concrete. I want to cast a privacy (non-bearing) wall out of large aggregate (6" round-like granite fieldstones). Is there a formula for how to graduate the mixture down from 6" rocks down to gravel and sand / cement to make the well-graded aggregate / paste mix?

[@revery85inc61]

SEEK THE TRUTH AMAZING!

[@ermiasnigatu177]

God bless You

[@bediosoro7786]

What is the best concrete design engineering books for building construction

[@Dilberto88]

Did you review the core sample report, just released from the collapsed Florida Condo? It looks bad. It appears the cement has turned into powder. Let us know your findings. Great job!

[@user-dr2pg8fk2i]

Can you do a video on using brick crush as an aggregate?

[@jonroche3784]

Hi Tyler, Great and very informative videos. I have a simple but I think interesting question for you. How much moisture content should we include and allow for within aggregates including sand in our mix design? This is important in my opinion because it can throw out the W/C/R if not calculated for in the design.

[@TylerLey]

Jon - Good question. It depends on the moisture content within the aggregate. Usually, we have to measure this and correct our mix for it. I talk about it in these videos. kzbin.info/www/bejne/np-8oKOCbNqNe5Y&t kzbin.info/www/bejne/bqWUpXymqLGpmZI

[@infraprods]

Jon, unfortunately we don't tell aggregate how much water we should allow for it, it tells us how much it has! I've seen sands that have 6% moisture. To put that in perspective: a yard of concrete might have 500 lbs. of cement in it and 1,400 lbs. of sand (totally arbitrary numbers). 6% of 1400 is 84 lbs of water. If our mix has a .5 w/c ratio, that is 250 lbs. water TOTAL (including moisture in the aggregate). The 84 lbs (plus whatever is found to be in the coarse aggregate) has to be subtracted from the total. If you look at a batch ticket from a ready mix plant they often give you design water (250 lbs) and Water Added (250 - 84 - coarse aggregate moisture). Moisture is so variable (even going from one part of the agg pile to another can have an effect on the same day) that it has to be monitored constantly.

[@marykwan5829]

Dr. Ley, pls kindly tell need how to make concrete for a 10 Bay garage for fixing cars and semitrucks. Appreciate your answer, Thank-you so very much!! Also, need it in 2 days as well if possible, gratefully, Dave

[@WAGNERMJW]

Question: How do each of the varieties of modern concrete compare with Roman concrete: in terms of any criteria that matter?

[@herbertalvarez6017]

Hello. I love your videos. What do you mean by gradation. Thank yoy

[@tonyborg4510]

Hi, i want to make a concrete block on soil outside as a fixed grave stone to serve for many years. Which concrete you recommend? Thanks.

[@Dev1nci]

Hi Rob if you have the time I would like some advice please. I’m looking for a claylike concrete to apply to a form. I would like to pack it by hand to be between 10 and 20mm thick and would like it to have the same strength properties as fibre cement board. I know it’s audacious of me but do you have a recommended recipe? I am in South Africa but I have access to Chryso and Sika. I will ask them for advice too. It’s for a home renovation. I would like to make a fancy window frame type thing for my parents.

[@willbee6785]

This video should be linked to a on-site concrete laying video with wall & slab form techniques simply to show what you mean. Students would link it all together more quickly. Great info as usual.

[@user-nx4ti8xs1o]

I didn't get the last few minutes - min dimension/cover - is that by volume or total width? 3/4th of what? Let's say my wall is 6", and rebar size is 3/4th inch. What should be the aggregate fill?

[@infraprods]

Tyler - I'm no Tyler but I did write an article for the International Concrete Repair Institute's magazine Concrete Repair Bulletin (Mar/Apr 2019) titled 'I Wanna Rock! The Significant Role of Aggregate in Creating Great Concrete Repair Materials' It's a simpler version of what you are presenting. One interesting thing I found based on aggregate volume : surface area ratio. Of course going larger on the coarse gives you higher slump, everything else being equal. However that slump benefit diminishes once you get larger than 3/8" MaxNom since the V:A ratio converges pretty quickly at larger sizes. Do you agree?

[@TylerLey]

Thanks for the comment. Shoot me the article offline I would like to see it. I have not done a lot of testing at that low of aggregate size. I can say that there doesn't seem to be much difference between 1/2" to 1.5". I think the surface area is important but there are other things that are more important. I can send you some recent journal articles that we published that gives more insight. We are also doing a ton of work on manufactured sand. It has really opened my eyes on sand and how it impacts workability and performance of concrete. I think we will have some tools that will really help the industry.

[@atom410]

Hey Tyler I am making cement pot plants small ones about 10cm high they are cracking. What do you recommend with the mix and I also want to achieve a smooth finish would be much appreciated if you can get back to me thanks Rob 👍

[@ezralaguna3622]

hi! can u help me for my thesis? i was wondering what is ur take on bricks and roof tiles as aggregates on concrete?

[@ezralaguna3622]

i hope u reply i badly need ur opinion abt it. thanks! ;))))

[@eivsyvgmailcom]

Hi Tyler, just wanted to say that you make me happy when i see your videos ! Your Joy in this field is contaminating

[@RicardoCruz-tn8by]

thanks. Which is your opinion about mica in sand and influence at performance the concrete?

[@TylerLey]

It depends on how much mica there is. Mica can have a lot of reactivity from ASR. It is also not a very strong material and it cleaves easily. However, it might help you reduce your modulus which might reduce your cracking. Do you have any experience with it?

[@RicardoCruz-tn8by]

@@TylerLey it looks mica increase water demand for a given slump and these sands that contain mica normally has problem with stability of air.

[@TylerLey]

Interesting! I have not seen that.

[@infraprods]

It makes your concrete more glittery! I worked for a a large manufacturer of cement based tile thin sets and grouts (one of the well known names). It seems sand in GA, where one of our plants was located, has a bunch of mica in it - an amount that is noticeable to the eye when looking at the grout. I once got a call from a customer - Something's wrong with the grout, it's not as shiny as usual. He had gotten product from a plant in a different part of the country.

[@toxicknightsbw4209]

explain what is meant by bulking of aggregates? indicate why the extent of bulking of sand depends upon moisture content (10 marks)

[@kocovgoce]

whether the strength of the concrete will increase if we use basalt rock aggregate

[@mohamedabdelalim896]

Hello dear friend, I work in ready mix concrete and I'd like to be friends and help Me in mix design

[@kocovgoce]

@@mohamedabdelalim896 my idea was to use fine basalt sand as a substitute for river sand in concrete for greater rigidity my idea is to use 1 part of the cement 1.5 parts of large basalt sand and 0.5 parts of fine river sand for better filling of cavities.

[@mohamedabdelalim896]

Goce Kocov well, I hope we can be in touch and go for further discussion about different problems in Concrete, here's my what's app number for better contacting, thank you in advance dear friend, [phone]

[@luisluigiconcretellc9604]

67 rock vs 57 rock in concrete -- been seeing lot more jobs looking for #67 especially @ the elevated slab levels??

[@dekonfrost7]

Honestly a lot of what you were saying about the same mix is hard to understand what you mean. If a mix is different its different. Can be the same and different. When i listen to this i think about the fact it would take years to even explain how concrete works. I mix a lot if concrete a few yards or a few dozen yards at a time special mixes for strange micro engineering jobs i get. Walls, underpinning etc. the point is you can not get good concrete in a bag ever. You have to make your own. So ... you have to know how

[@johnsdsl]

I think he's just saying that the weight of each ingredient is the same for each mix.

[@totonow6955]

Very well done but I believe your preschool teacher did not teach you not to say other people's food is " nasty" . Or was it that you did not listen? 😉

[@albaaqiy1160]

Sir, your written material is not satisfactory plz write in Sharp bright. TM MWAL PAK