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Measuring w/cm in concrete with the Phoenix!
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- เผยแพร่เมื่อ 1 พ.ค. 2023
- The water to cement ratio (w/cm) has widely been known as the most important parameter in concrete and there has been no established procedure to measure it. This video provides a practical tool called the Phoenix that can be used in either the lab or the field to measure the w/cm in 15 minutes. The tool can also be used to measure the moisture content of aggregates. This video introduces the Phoenix, explains the procedure, and shows the value of the method.
You can learn more about the Phoenix at www.concretephoenix.com and at www.globalgilson.com.
Lean more about me at www.tylerley.com
Donate to my channel at www.tylerley.com/giving
This video was editited by Branson Evans.
I posted a video where I answered many of your questions about the Phoenix. You can find it here:
th-cam.com/video/1TFj22oru1w/w-d-xo.html
Great speaking with you and Jake today. Looking forward to the next one! Shari9ng this video as I write this!
I love every time I see a new vid! Keep it up Professor Ley!!
Thanks Johnny. More coming!!!
Amazing channel and very informative content for any level of expertise!
Thank you so much for watching!
Tyler, is the Pheonix capable of differentiating between the water in the mix versus things like liquid color or liquid admixtures? I assume this can be done by entering the specific gravities of these colors and/or admixtures?
We used to use a microwave to cook down concrete samples for this testing during main line paving. Is that not an acceptable test method for w/c ratio any longer?
I was thinking what is he gonna do? Microwave it? 🤣👍
I notice it's "crickets" in here - i was kinda hoping for an explanation why microwaving is a far inferior method - we shall see 👍👍
Either way i love this guy's inventions - this ain't the first 👍
@@BracaPhoto I am making another video to talk about the most frequently asked questions about the Phoenix. I will cover the microwave oven in that video. This biggest challenge is the sample size is too small and it takes too long to remove the water.
Very Nice presentation sir.....
Thanks!
This seems to be a water to stuff measuring system by using a very expensive, very fast, hot oven. Since the actual mix vs the batch ticket depends on the variability over time of the batching hardware (whether at plant or inside of a volumetric mixer), what has been the measured variability of these things across manufacturers and operators? It seems that if an operator can achieve a given measured calibration with minimum variation over time (of all the bits going in), the benefit of this device is to allow the operator to tweak a batch calibration for the actual water content of the aggregates coming from given piles on given days. With barrel mixers I definitely appreciate the value of this device to catch sloppy operators before it gets expensive for everybody.
I’m not sure if the oven is “very” expensive. It looks like a pizza oven? I don’t think that’s too costly, particularly compared to what bad concrete might cost you?
I think you have a good read on the technology. The producers that are most interested have focused on making consistent concrete or finding an actual measurement of the water content versus what they think. This can also be tested in the field, at a lab, or at a plant.
awesome video as always tyler. question pertaining to natural pozzolans: because of their high water demand, what is batched as a 0.45 mixture with say 25% class n may perform like a much lower w/cm mixture after mixing. i venture to say there is an “effective w/cm” that is different than that of what was originally batched. would the phoenix test capture something like this?
Nick - This is a good question. You could take this into account in the calculation of the app. You would just need to add the pozzolan as a fine aggregate and put an absorption content in the program.
I have heard people talk about pozzolans absorbing water but I have not seen a lot of data that has quantifying how accurate this is and quantifying how much this is for different products.
Take care!
Thank you for your exciting videos!
Thank you!
Isnt it better to check if water content is right with a microwave probe inside the concrete mixer? Even thou you can place aditional probe on the conveyor belt. To measure water content inside the aggregat.
How would plastic fibers affect the Phoenix?
They are not a problem. Plastic fibers are used at pretty low weight percentages. Like 0.1%. This is 4lbs/cy. Even if you double this it is only 0.2% of the weight. They burn off in the test but they don't really change the results.
Only water and only cement has nothing to do with strength but it deals with consistency. For strength the cement paste should be good that's why gel space ratio is more important than w/c ratio but it has some drawbacks . It can prove more better results if some studies will be done on countering the drawbacks.
Manish - I was talking about gel space ratio in a simplified manner with the first couple of illustrations. Thanks for the comment.
You are awesome!!!
How can i get ahold of u like a dm?
I’d luv to see your view on the concrete at the SpaceX Boca Chica launch pad
Thanks! I think that is a good idea.
Thank you very much professor, it's very useful video
Thank you Khalid!!! I appreciate you watching and commenting.
Hi tyler, i saw few moths ago a video of you explainig about a material used as an addmixture called buarin or somthing like that, can you please send a link
FANTASTIC
Thanks!
Cool stuff!
Thanks!
Tyler, would you please do a video on this dry pour fad I keep seeing in my feed. It seems like a bad idea but I don't have any technical understanding to justify why I think its a bad idea.
I will look into it! Why are people saying it is better?
What ASTM does this fall under? Thank you.
None yet. Minnesota DOT has a test method. I will be at ASTM in June to talk to them about the Phoenix.
This is a great idea!
Thanks Adam!
What about altitude. Doesnt that affect the time it takes for the water to evaporate?
Good question! The 15 minutes is based on a place close to sea level. As you go to higher altitudes the test should take less time. The full test method has you take the sample out and weigh it and then put it back in for 2 min and then weigh again to make sure all the water is gone.
Did you also test the diagnostic power by deliberately making faulty batches and seeing if the measurement properly reports the a priori facts? And do this double-blind to prove no bias? If you only tested commercial batches with correct formulations, then you're not really conclusive about rates of both Type 1 and Type 2 errors. But any valid metrology is a worthwhile advance in engineered quality.
Hello Professor 👋
HI!!! Thanks for watching.
What it needs to demonstrate is correlation between Phoenix numbers and Strength - 👍
Then there's value
There is a lot of correlation between w/cm and strength for a given set of materials. I can talk more about that in some upcoming videos.
A newbie question, if the concrete has a slightly higher water content, wont it evaporate off as the concrete dries, but allow it to be well hydrated for good strength? Previous videos have shown its good to keep the concrete hydrated (watered often) during curing...
Water applied to the surface is more about preventing evaporation than getting water into the concrete. High quantities of bleed water (what you're describing as excess water leaving the fresh concrete) will cause issues.
Wetting freshly poured concrete is about maintaining the intended w/c ratio, not increasing it.
Water that is added AND MIXED IN while the concrete is still a liquid will change the cement grain spacing and make it weaker and easier for outside chemicals to penetrate. Water just added to the surface after a concrete is placed will keep the water from evaporting and causing cracking. One key is the amount of water being added and how much it is mixed in.
@@n00b1n8R Thanks for clarifying!
@@TylerLey Thanks professor Ley, your reply is gratefully appreciated!
Can I rent one these machines from home depot?
Not yet!
Thanks so much
Interesting. Any connection to ASHTRICH LLC or Super Air Meter LLC?
No connections.
@@TylerLey Sorry for asking, but I hope you will be understanding . I do enjoy your videos. Any chance of you doing a video admitting the Roman got it right 2000 years ago with their interesting mix?
@@williammorton8555 Thanks!
I am not sure they did get it right. I have some videos about roman concrete. I think it is called something about how to win a bar fight.
Hi professor, Yeah I think this is a game changer, but I assume I couldn't bought for my University's lab but just for testing the idea, how much heat does the oven should have? If you could reffer to a paper I'll apreciate, grettings from Bolivia
There are papers listed in the second Phoenix video. Take care!!!
@@TylerLey yeap thanks Professor
This is really useful …
I am glad you like it!
I will be part of the Phoenix.
Awesome!
Here’s a good video in case you’re a total concrete noob like me: th-cam.com/video/rWVAzS5duAs/w-d-xo.html
It will probably help you understand this (Tylor’s) video better.
It's arse about. If you measure your dry cement mix and then your water - all by weight - prior to mixing, it saves all the hassles - after mixing.
Shane,
In practice this is much easier said then done. I have lots of field data to show that lots of water gets added to concrete. Watch for a part 2 video where I talk about this more. It only takes about 20 L (5g) to change the w/cm in your concrete mix.
Last year with an oat of -5c and overnight of -10 the contractors poured by 1600, the next morning they stripped by 0800. It was green and steaming, they backfilled 2days later without a floor system. A big part of our problem is code/building inspectors(paid for by builders/government) not doing a proper job. I actually was told by the head of building inspection services, " it is not my job to babysit contractors" wrong that is your job. I had to go to new building insurors where they threatened to avoid the insurance before they wou!d stop(until caught the next time)