Fineness Modulus (FM) | What is it and is there something better?
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- Опубліковано 31 гру 2018
- The Fineness Modulus (FM) is a single number that is used to determine the aggregate distribution. The lower the Fineness Modulus the smaller the average particle size and the larger the fineness modulus the larger the average particle size. The Fineness Modulus is typically used to describe sand and is an input to the ACI 211 mixture design method.
This video explains what the Fineness Modulus is and how people use it. The video also shows the challenges with the Fineness Modulus and how the Tarantula Curve can be used to give more insights into the sand performance in concrete.
Tarantula Curve Playlist:
• Overview of the Tarant...
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www.tarantulacurve.com
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Just got this quality control job in a prefab concrete factory and, as you said, finding clear info on all the concepts is not easy, even in reference manuals. Didn't know FM could have such an influence on workability! I'll definitely use your Tarantula model to analyze our next sand orders... Thanks a lot, new fan!
When I want to learn about concrete, I always check your chanel. You make it so easy. Thanks Dr. Ley
I hope that one day students of civil engineering from Bangladesh will learn about the Tarantula Curve from their institutions and apply it practically.
Good luck Professor Mr.Concrete.
What a great knowledge you are creating, thank you so much 🙏.
Thank you!
Thank you for this presentation
Just brilliant Explanation. Thumbs Up
Awesome presentation.
Keep it up.
Dr Tyler, I just learned quite a few things from you!
Thanks!!!
Very nicely explained
Thank u so much for your effort big like from Saudi Arabia
Thank you for watching!!!
Great video , and happy new year to you dr tyler !!!!. May 2019 be your best year yet, with the best concrete video also 😁.
Thanks Hamza!
Thanks.your videos are great
what an amazing video...
you are the man thumbs up
Thank you very much sir 👍👍👌
Your explanation is 10 times understandable than my professors. TT
thanks .. alot
Wow..now that's what called an explanation
Thanks so much!
🙏 Thanks.
Sir,
Good one...
Glad you like it!!!
Thanks
Tyler another great video, thank you. I do want to pose a question/point on this topic. When calc’ing the fm why is it that the portion of the coarse aggregates that’s small enough to be considered as a fine particle not included in the fm calc. I know the sample weight would have to be refigured and this measurement is just about the fines but I say it all ends up together. Maybe I need to review my Aci cp manuals but there seems to be a grey line of definition for fine and coarse cut offs. Maybe they put the line on the sand by requiring a geologic composition analysis?
I realize my wordings are a bit off hope this helps clarify. I think what I should have noted is sand (fines) vs coarse aggregates have an overlap in their standard stone size gradations. So where do you draw the line.
Kevin - Good question. For calculations, the #4 and smaller are considered fine aggregate and things larger than that is coarse aggregate. But as you know, this is great for calculations but doesn't represent the real world as we have all sorts of sizes in what people call coarse and fine aggregate. This is one reason why a combined gradation like the Tarantula Curve is a better approach than the FM. A combined gradation uses everything and doesn't think about where it comes from.
However, the FM is very useful to get general ideas about natural sand sources. However, in my opinion, most people put way more importance in it than it deserves. It was just a way that Abrams came up with to make something complicated simple.
I certainly don’t disagree. But I just want to share some more specifics, for the sake of sharing. What I’m seeing is different stock piles at the batch plants one for sand and others for coarse (67, 57, 8 ect). But when they sieve at batch plant they only consider sand stock piles for the fm analysis and not the entire coarse and fine. Which is also what is done at time of design mix. So we just use the fm as a check for aligning with the design mix with the actual mix which i think is ok. Anyways I agree with the spider curve it provides relevant aggregate mix information and would better restrict the manufacturers from creating slightly off mixes that still pass batch and field tests. But i believe the sieving process/procedures would need to be defined to capture its full intent.
Your videos are great but please add subtitles to your videos for better understanding. Thank you❤️❤️
Man with zero hater 😉
(Tongue in cheek) As a QC manager for a ready-mix producer, with nearly 30 years in the industry, you can take your FM, tarantula curve, coarseness/workability, agg ratios, paste factors, etc, etc and shove them in a drawer. There is one true implement that will tell you exactly how your mixes are performing... the telephone.
Tyler, do you think you could do a video about how the sand gradation affects air entrainment?
Exactly the info I'm looking for too... We suspect our quite coarse sand to decrease the entrained air... Alex, did you find something somewhere? Thanks in advance!
@@hugorobinson277 From what I was able to gather coarse sand will decrease air content due to the sand taking up too much space, and too fine of sand can increase or decrease it, there doesn't seem to be a set guideline on that.
@@Tigersfan829 yep, that's what I've found too last week, in a Google book scan of a 1966 study... saying too much of the sieve 8 and 16 sand in particular decreases entrained air and my granulos suggest that. Was wondering if 2020 science knowledge would give me more details why, but it's quite hard to find anything concerning that on the web. Thanks for your reply!
hello sir .i want to know why we have dash dash in in table 3 for some seive sizes, no percentage has been given.(BS 00882-1992 )of aggregates
How to calculate it?????