ASTM C138-Unit weight of concrete and C231-Air content via pressure air meter

Air content of concrete using the pressure air meter (ASTM C231) and unit weight of concrete (ASTM C138). Two tests required as part of the ACI Concrete Field Testing Technician-Grade I exam.

[EnglebertHumperdinck]

Matt yourss are the best concrete cert vids on youtube IMO though this one has a couple small flaws in your procedure (didnt wet the measure and all of your concrete scoops went in on the same spot on the perimeter instead of moving around it). Thanks for going to the trouble of uploading these I know there are a lot of us out there who appreciate it but probably dont comment.

[EnglebertHumperdinck]

Forgot all this stuff since I first certified, back watching again before my recert. Matt I get the impression you are too smart to be a career concrete tester. I'd be interested to hear how your career has progressed. Thanks again for the videos.

[fishing]

Love the videos man! Thank you for posting!

[jamesglines]

thanks for doing this. this is a good run through, I am studying for the ACI test and if you did this again, verbally state all the steps and make sure to say "uniformly spreading concrete into measure" etc as this could be used against testees

[GundamTech]

dude, this was very informative, thank you!

[adariganesh]

I have dought sir, the unit weight of pain cement concrete is 24kn/m3, but I have dought while doing this test which grade of concrete is taken

[HectorLopez_]

He sounds like a dude who actually does the test out in the field

[lacoste]

What will be happened if we adjust meter initial point at 5 instead of 3 is will give us more air or less air?

[leerx]

full weight minus empty weight,
equals weight of concrete.
divided by volume of container.
equals unit weight pounds per foot...

[lacoste]

Plz clausing of airmeter valves after make pressure it's important step should be clause or we can keep it not clause and what is the effect of that.. Thanx

Excuse me, i don't understand what I have to subtract (minute 11:00).. Thanks!

[amandastrand]

Thanks for the share, well appreciated.

[chrisbergey]

Took this guy forever to do the test. Christ the truck would be empty already...