ACI Lab Level 2 - ASTM C157 Length Change of Concrete (Shrinkage) - CRMCA Online Concrete Procedures

**Still valid in 2024**
CRMCA presents the Online Concrete Procedures for preparing for ACI certifications.
ASTM C157 / C157M - Standard Test Method for Length Change of Hardened Hydraulic-Cement Mortar and Concrete
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CRMCA website: www.crmca.org/
CRMCA Registration for ACI: www.crmca.org/...
ACI website: www.concrete.org/
ASTM website: www.astm.org/
ACI Reference for Modifications to C157 (2018): • Modification to ASTM C...

[@RajuSharma-ir5is]

The video at time 11:29 minute, How the shrinkage percentage value is calculated? Please explain..

[@JorgeLuisJaldinLarrain]

Thanks for this video. It arrived just in time.

[@crmcacolorado]

We are glad to be there just in time for you! Hope it helps in the process.

[@jesusglopez8430]

Thanks for sharing.

[@taiwoagunbiade3619]

The % shrinkage looks incorrect.. or am i getting it wrong?

[@arminjamali9067]

Could you possibly inform me what value should be substituted if the gauge length is not 250mm (10 in.)?

[@vlogsbybushra]

awlla video

[@azbam87]

I think your information is incorrect in your initial information in respects to consolidation. Although at 4:01 the reference to ASTM C192 is correct C192 does not give us a range for consolidation per lift it would be a flat 30 or 40 rods depending on the size of the mold. There should also be a range of 10-15 taps with a mallet as noted in C192. Although the video did help understand the test method in general. I thank you for many clarifications.

[@crmcacolorado]

Thank you for the note. We will review for our update soon!