They Tested Our Concrete! (Slump, Air, Cylinders)
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- เผยแพร่เมื่อ 12 พ.ย. 2022
- #EverythingAboutConcrete #MikeDayConcrete #slumptest
This is how you do a concrete slump test, test for air-entrainment, and take concrete cylinders to test strength at 7 and 28 days.
We're pouring a bridge deck for a walking path and the concrete was tested to make sure it was within specifications.
The spec was 4500 psi concrete, 6 inch slump, 4.5 - 7.5% air entrainment.
See how the test turned out in the video.
Then watch Part 2 - How to pour and finish a concrete bridge deck.
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he was a real sport allowing you to record! cheers
I'm involved primarily in street and highway construction, so our concrete gets tested every day. The ready mix we use most is always low on air. It makes me wonder how much concrete they've sent to residential and commercial jobs (where tests aren't done) with low air. It's a pretty terrible ready mix, all things considered.
That’s cool! Looking forward the the bridge pour!
Thanks for that look of the testing process 🙏
Amazing workz! Take care guys!
Thanks for your videos, they are very informative.
This is just what i was researching today. And wow. U posted it yesterday
Good guess on the slump!
Added, thank you for posting and sharing.
Great Video! Thanks 🤘
Good morning Maine! Looked like it may have gone back to a five while you waited for testing? Have fun!
I learned the testing process a long time ago, I have never seen a person count 25 so fast in my life, I tried to keep up with that.. He is good!!! Mike, you shouldn't be asking that guy questions while he is counting out to 25... LOL
I know, sorry!
For real though, as a tester, i wish i could master holding a conversation and counting. It feels so rude having to finish or stop what i'm doing before responding to what is likely small talk. Seems like a decent tester, his rodding speed is pretty fast but the precision is a bit off. Regardless, i'm sure the accuracy was near perfect.
ya he was going for the olympic world speed record.
@@GlowingBlight yup would tell the guy I could answer all his questions when done with the test.
Whats the difference between air intrapment and a water reducer?
Damn those are fast hands
that dude is so goddamn fast. i havent been doing materials testing for long but holy shit hes fast as hell.
a little too fast
That air test looked super bogus.
How so?
@@neildavis167 He's probably talking about how the guy kept slapping the meter. The measurement device itself is fine of course.
everything he did was fine....except shaking the meter when inserting the water.
It was right u shake the AirPod at most twice and tap the gauge to get out trapped air
Scientific. I did not get the way they tested for air? Look like he purged out the air with water, pump air in then helped the gauge along by rapping the test cylinder? Right on ;) That is why I am not a scientist.
Pressure equalization method. You pressurize the fixed air volume in the top of the meter to a known pressure, then open the valve to the mix. The initial pressure will only drop if there's entrained air to compress, so 0% air would not change the gauge reading, but 7% for example would show a pressure drop as the air bubbles, which are initially at atmospheric pressure in the mix, compress slightly.
Was he rodding it only 19 times per lift or level?
25 times
25 though with how fast he went it seemed like less.
I get tested all the time by the ready mix company. Back in the big commercial days we got tested for every pour. Nothing worse then pouring a 4 inch slump in the summer. At least till the tester was gone.
Theres the comment from a true concrete guy. Too bad out here in washington you would be observed all the time.
Better giver her a drink when the test guy leaves. Never seen you guys pour a 6.
Damn bro tell him to clean his equipment and why is he doing concrete out the minivan
Tester doing it wrong.
Also supposed to keep between 60-80 degrees
What is he doing wrong?
Tester was supposed to run a yard or two out before filling his wheelbarrow. Too lazy to push it back to his truck, so he tested off the front end of the load. Never do that. Samples cylinders are supposed to be filled and rodded in thirds, not halfs. Didn’t see a temperature taken on the concrete. Talk about blowing through a job…..
Your comment about filling cylinders in thirds is completely wrong. 4x8 inch cylinders, according to ACI is filled in halves. 6x12 inch cylinders are the only cylinder filled in thirds.
He needs a new gauge! If you have to tap it, it's not accurate! Something is binding up the movement of the needle.
Tapping the gauge is a requirement
Wrong. You have to tap it
he did almost everything correct
Wrong! That is how it is done as per the ACI requirement.
You have to tap gauge to stabilize needle, says in the ACI guidelines
Fail as a tester
how do you figure?