ASTM C31 - ACI Making & Curing Concrete Test Specimens (Newer Version Available)

[@cba8351]

What is the basis of 1 set composed of 3 samples for every 75 cubic meters of concrete?

[@juhabagat2397]

Tapping in the video is not enough to release the air entrapped in the fresh Concrete, it should be more tapping otherwise your sample is not compacted it has air void on the surface.

[@patkonelectric]

Have you have any info on Dry Cast Cylinder testing? It seems no one real knows the true process.

[@glenndeal8013]

What is a dry cast cylinder?

[@lovetiddays]

your not supposed to use a mallet

[@juttengineer4084]

I think 25 time Roding will only one place at the center of cylinder. MA Zubair Associate Engineer From Islamabad Pakistan

[@benrent6625]

So nowwww we can use a steel trowel…

[@ArsenalFcforevahh]

Everyone saying use your hand? Yall need to review the damn book again! no where does it say a hand is acceptable, no where does it say use a strike off bar for strike off, alot of rookie mistakes in this video, please refer to ASTM standards and study, dont let people online fail you

[@sicerts]

This is one of our older videos - I'd recommend viewing our newer version (better production quality) here. kzbin.info/www/bejne/j6ewiHaJi66tjKs Quoting from ASTM C31-21a, section 9.4.1: "...After each layer is rodded, tap the outsides of the mold lightly 10 to 15 times with the mallet to close any holes left by rodding and to release any large air bubbles that may have been trapped. Use an open hand to tap cylinder molds that are susceptible to denting or other permanent distortion if tapped with a mallet." Now with plastic molds, they are likely not going to be damaged, but using the hand is clearly stated and permitted in the ASTM to "close any holes left by rodding and to release any large air bubbles...". In our new video, we also address the finishing aspect (9.5.1) with either a "tamping rod....handheld float or trowel...", according to the ASTM. We've had lots of people use our free videos to help them pass the ACI test, along with our online ACI course. You can download the latest ASTMs from www.astm.org to ensure you are up to speed on these things. Let us know if you need help with anything else.

[@ivoryboxingnation3563]

You don’t use the hammer with the cylinder you use your hand !!!

[@davidehlersakamesfin6202]

Take this video down! You need to use your hand

[@nicholasreeves6460]

ACI says you can use a mallet