ACI ASTM C231 - Air Content: Pressure Method 2019

[@tariqfaruqi389]

Good video. I passed the exam on Nov 11,2021.

[@MexicoJAH]

Helped me pass my ACI. Thank you

[@ElmerHomero-do8hg]

Great video sir. Straight to the point and clearly explained

[@southernyankeerobinson2334]

Just took this test on 09/21/19 and failed my first attempt for not asking for the correction factor at the end so please do not forget to ask that!!!

[@JSSTyger]

@@aulajomaa6286If you are taking the ACI Grade One test, your company should provide you with the relevant ASTM standards. You will need to know slump, temperature, air content, and cylinders. You will need to know proper sampling. You will also need to know the dreaded roll-meter, which is used to determine air content for lightweight concrete. I've been doing testing for 15 years and I've only used a roll-meter on (2) jobs.

[@JSSTyger]

@@aulajomaa6286 I work in Ohio and needed Grade I ACI to test concrete in the field. We had a written portion and then had to run all the tests in a lab (2 types of air tests, temps, slump, make cylinders).

[@ZootedSnake]

@@JSSTyger how do you know what the initial pressure is?

[@JSSTyger]

@@ZootedSnakeThe initial pressure for a new pot is in print on the neck of the top piece. Sometimes the pot needs re-calibrated and the initial pressure would be determined during calibration. The IP should always be marked somewhere on the pot.

[@ZootedSnake]

JSSTyger ok thank you

[@alexschatz1]

Nice video I just passed the exam Nov 16, 2021

[@PrometheanFrErunning]

Do they time this test ?

[@alexschatz1]

@@PrometheanFrErunning no they don’t the only test that they time is the slump and it’s 2:30 min

[@GooseGoss1963]

I appreciate all the skipping past the first part, but I struggle with knocking every bit of air out of the vessel before taking the compression test. It seems to me that if it was in a controlled area that it would maintain that air?? or am I wrong

[@Gulyus]

This is why the test emphasizes the flat surface of concrete in the first half of the test / the start of this video. A flat surface of concrete will be right up against the bottom of the pressure chamber. That is also why you put the water into the petcocks. Once water is standing in both petcocks there is no non entrenched air inside of the pot. The concrete is right up against the bottom of the top piece (top of the chamber) and any air that is trapped is pushed out by the water introduced. You then pressurize the top valve with air - then until you press the air valve on top and hit the side of the pot there is no connection between the air in the top and the pot, therefore there is no air introduced to the lower chamber until the time where the test is taken.

[@jesusglopez8430]

Excellent very educative and informative Thanks.

[@noeorozco5054]

how much should u be getting pay if you pass this test?

[@robertoreyes3588]

Great video can someone help me to give me an advice how to calibrate my air pot

[@mdnt_ramble7]

Why do you pump it up with petcocks open? How’s it hold the air?

[@witherskeletonfilms2851]

The air chamber is closed off to the rest of the air meter bowl. Whether the petcocks are open or closed it doesn't change anything. Once he depresses the main air valve, it raises a pin inside the air chamber that releases the air into the air meter bowl.

[@mdnt_ramble7]

@@witherskeletonfilms2851 thank ya

[@engineeringbook8955]

Why need ip until 2 not zero

[@CameronDude]

Passed today

[@rocknjap2]

You didn’t release all the pressure in the chamber before putting the lid on the pot. That makes your tests not uniform

[@awrangzibalkozai4390]

Great

[@empireaxe8852]

Why did u not show the first steps?? Filling the pot with concrete, 3 layers rodding 25 times each tap 10-15 times each etc. If you’re gonna show the test show the whole thing

[@hollisterguy1623]

That’s a different ASTM

[@BluePixelvideos]

He made an individual video for that

[@jayysanchez9356]

@0:10 🤨🤔😂 pay attention.

[@jerryg740]

Should be in there. Its all part of ACI test.