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CRMCA presents the Online Concrete Procedures for preparing for ACI certifications.
C138/C138M-Density (Unit Weight), Yield, and Air Content (Gravimetric) of Concrete
**Updated for 2022**
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CRMCA website: www.crmca.org/
CRMCA Registration for ACI: www.crmca.org/american-concre...
ACI website: www.concrete.org/
ASTM website: www.astm.org/