ACI Field 1 - ASTM C172 Sampling Freshly Mixed Concrete - CRMCA Online Concrete Procedures (v2-2022)

CRMCA presents the Online Concrete Procedures for preparing for ACI certifications.
C172/C172M-Sampling Freshly Mixed Concrete
**Updated for 2022**
------------------------------------------------------------------
CRMCA website: www.crmca.org/
CRMCA Registration for ACI: www.crmca.org/american-concre...
ACI website: www.concrete.org/
ASTM website: www.astm.org/

[@AliKFahad]

Thanks for making C172 very easy and simple, Appreciate your efforts.

[@rupeinspections5611]

Thanks for sharing this with me and having an up to date video

[@jesusglopez8430]

Excellent very educative and informative, Thanks.

[@johnkennedy3602]

The newest ACI Field Testing Technician Grade 1 book (CP-1 40th edition printed in January 2023) shows what you call the "open top mixer" as a 'continuous mixer truck." I'm wondering where the discrepancy is. Our company owns a few and we call them "Zimmers."

[@meharzaib3498]

Hi
Are before sampling the contentious mixture should be mix or not if yes so how much time to give for mixing?

[@Whoooo00]

Thanks

[@muhammadhqadhir1468]

I have a doubt we should collect samples after 10% for example if we have rotating drum mixer 10m³ of total volume we could not use 1st 1m³. This 1m³ we have to dump on a receptacle or pour into a structur?

[@abduljabbar-bg9bi]

Good job

[@winstonnelson946]

You say samples shouldn't be taken from the first 10% or the last 90% of the batch... don't those, combined, equal the entire batch?

[@nathan_steffen28]

First 10% of 2/3 and not 90% of the 3/3

[@hayderhayder506]

Can we use cube for sampling instead of cylinder

[@AllforOne_OneforAll1689]

No, not for heavy or lightweight concrete. Either 4x8" or 6x12" cylinders are compliant.

[@user-cr7lo4tk5h]

Question, you said do not take sample from the first 10 % or last 90% of the batch. Can you explain what you mean by this? That equals 100% so when do you collect sample?

[@jayinla228]

It means your samples are taken between 10-90% of the batch, not the first 10% or the last 10%

[@crmcacoloradoreadymixedcon234]

@jayinla228 is correct. The video states it incorrectly and will be updated to state "after the first 10% and before the last 10%" soon!

[@guillermocentella4802]

2:30 is this correct?

[@crmcacoloradoreadymixedcon234]

if you mean the location of the sample being take, yes. It is worded different in various documents thought all reference the ASTM Standard.