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- เผยแพร่เมื่อ 2 ต.ค. 2024
- Air Content: Volumetric Method
ACI Technician Workbook CP-1
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CALIBRATED CUPS
1 Calibrated Cup = 1 Percent Air
A calibrated cup is used when the water level falls below the neck on the air meter while running the test. If this happens, either the concrete contains a significant amount of air, or your apparatus has leaked during the test.
Add calibrated cups of water to bring the water level up into the neck so its level can be measured. Record the number of cups added, and add to the final air content at the end.
Example: 9% air reading + 2 calibrated cups added during the test = Final reading of 11% air entrainment.
Air Entrainment: Air has been intentionally added to the mix (typically readings above 3%)
Air Entrapment: Naturally occurring air in the concrete mix (typically from 1 to 3%)
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Got to be the worst test ever invented
No. The prostate exam is worse. This is a close second though.
No lie i failed on the first try but when i switched proctors i passed. Thank God cause i drove 3 hours to the test
This whole test is invalid!!😂
Been in the industry 13 years and have never seen one in the field
@user-vd5fq6tf2bmy job pays for it.
He really did a good job on this. Much respect.
All the advancements in technology and we can’t get an easier and more reliable method?!?!?! The idiot who thought of this doesn’t ever have to do it on a summer day of 90 degrees
Thanks for this. Passed my exam several years ago but haven't had to use this method to test air. Video helped as a refresher.
I heard they're trying to petition ACI to do away with this for certification.
I really think this is a waste of time, like it’s time to move on from this Stone Age procedure. Now we have the air pot. That’s it. No one really does this. It’s like taking an old metal hard hat assuming you will need to use it but never will because it’s out of the market an unsafe now.
@@taddeydelazzierra4735 agreed. Should just be job specific. The only time you see much LWC is on a high-rise.
Best video I've seen so far on this method. All the details he gives, are from someone who has done this in the field for a while, not someone following the ASTM in a controlled environment. That's a real education that you don't get any other way.
THE TEST IS INVALID
Man lol it's been a year since u commented but I'm taking my test tmrw and I'm gonna be seeing his face when I sleep "Your test is invalid!" "Your test is invalid!"
@@deucedeuce333 how'd you do 22?
@@deucedeuce333 me too lmao
Step 1: Find a clean warehouse slab to dump concrete on.
😂
That’s the reason why EVERYBODY in their right mind is using ASTM C231 method ....air pressure and never the volumetric
You have to do volumetric if it is lightweight aggregate.
@@vashman01In my opinion, lightweight concrete is typically reserved for interior decks, for which there should be no need for air content testing. Even if there is, you can just adjust the reading maybe 0.5% (up) after doing the pressure method.
@@JSSTyger Lightweight concrete is sometimes used on bridge decks, which are exposed to the elements, so that would be one of the rare situations to use it in. Otherwise, I agree with you. But also whenever strength samples are cast, slump, air, and temperature are typically required.
I need a new job
Lmfao, just getting into this work, but I'm feeling optimistic
this is the funniest fucking comment ive seen on youtube in a while
Only once have I met someone utilize this test for data per an engineers request in the real world. For a hightop. Feel this an ACI flair that may or may not have had an effect on my pay for still not having an ACI. Keeps me on my toes though so thumbs up for the video
We use it for lightweight concrete all the time but only for lightweight.
THank you sir, you allowed me to pass my test from watching this video
buddy never once put the alcohol in tyhere
This is the worst test, first this method is for light weight concrete and LW is using rarely, 2nd the LW is mostly for internal slabs on metal deck and suppose to be Non air enterained, no need for test. So you may need this once in your career or may be yoy never need it. Anyway you did great job, thanks.
Right! And when your proctor tells you that some of his 2 hour old concrete, an hour in the wheel barrow, is struck in the bowl, and therefore your test is invalid, tell him to take a hike!
Your correction factor statement is incorrect, correction factor is applied at 2.5pt OR more. Not starting at 3pt
I know some of my coworkers will be watching this video tonight. A few of us are taking the test tomorrow. Good luck y’all🤞
Where you taking the test?
Took the test in Orlando, FL
@@386fishing5 so did I lol.. I was there. How do you think you did?
@@slicedbread4553 Nice, I know I passed the hands on you part but I probably need to retake the written part after I review the unit weight and yield section.
@@386fishing5 hands on was easy. I didn’t like the fact we had to answer questions on Saturday before the hands on. I thought that was silly when we just took the test the day prior.
I know I passed the test and hands on. If you have any questions regarding any of it, reach out. I’ll gladly help
The only thing I'd add is that I probably wouldn't shake it by the glass neck
too bad ACI certification isn't permanent
It's so they can keep making thousands off us every 5 years! I have done level 1 4 times and about to do my 5th. There is only so much that you can change on the test methods without changing the equipment altogether. Level 1 is now over $800 if you're not a member of ACI or other sponsor group. The Transportation Construction Inspector certification was like $1500 as a member. Hell, the books alone are $400!
We don't pour concrete, we place it.
absolutely
Depends on the slump...lolol
You the best man, Thank You for this video .
Watching this video helped me pass my ACI Exams. Thank for this.
Did it really? I have a test Thursday and Im nervous
@@joseleos9363 yes, I watched these repeatedly until I could do it easily without watching the video. He explains everything so well. I also had a really chill judge during my proficiency which also really helped.
@@tchallaw3st ya I’ve been watching a few on repeat I’m trying to pass the aci test more worried about the written exam. What company you working for
It is better to use the methods of ASTM C231 for the content determination than that method.
37403 Windler Corner
Thank you Sir ❤. Very informative vedio for me and all whose working in asphalt feild
❤
Can i contact you through WhatsApp
I am interested in CQTM certification
Not a practical test when your in the field.
Hello, do you have a video regarding the making and curing of concrete samples with the mold?
I know one thing, if you watched this video and took your eyes off of it for 4% of it, the test is invalid and you need to start again. Oh boy, so many things to make it invalid. I'm excited to study this but intimidated at the same time.
nice pos
from Afghan
Thanks from canada
Great video, but I would highly recommend NOT rolling the meter while gripping the latch. I’ve seen that go had plenty of times, where guys will roll with their hands gripped or palmed on the latch and accidentally unlatch it. Gets pretty messy 😂
Excellent job
Hello can somebody please tell me why the alcohol is added to this test? Please i have my test in a few days.
To reduce the bubbles I think.
The alcohol dispels the bubbles for a clearer reading. You will need to make a correction for the alcohol though.
We do it a little different but same results.
💪
Respectfully, how so sir? Just curious
Excellent very educative and informative Thanks.
Can someone explain how he can see air? what is air stabilization mean here? I cant see what he is pointing at in this video.
Raghunandan Reddy C
He is reading the graduated cylinder how the water mixed with alcohol decrease ...from initial reading to final reading...after shaking the water gets inside the concrete pore which is filed by air...so it makes decrease the water level and thus the reading...He did not zoom it that’s why you could not see the graduation
The air starts out entrapped within the concrete. After the shaking and rolling procedures, the air escapes through the water in bubbles. The loss in volume of air results in the water level dropping. The "0" mark on the graduated cylinder corresponds to 0% air content (air content is calculated as a percentage of the volume of concrete). Hypothetically, if there was no air in the concrete, the water level would not drop after the shaking and rolling procedures. The "stabilization" just means you have to wait for the water level to settle. If it doesn't eventually settle, it usually means that there is a leak.
Its not much different but this video i feel it shows more zoom th-cam.com/video/48oTYbI0378/w-d-xo.html
if the water level doesnt move more than 0.25% within that 2 minute period.
These are very good comments guys , thanks
And don't forget if you find yourself with a small amount of alcohol in your vehicle and not enough you can go to the old method of testing using the role of meter where you used to use three lifts fill it up with water and no alcohol to perform your tests and then after you're done if you have any suds you can use the 1% cap to pour alcohol in there to get rid of the suds but keep count .