[ACI Field Grade I] 4, A Representative Composite Sample, Not the Easiest Scoop
From Trades Exam Prep · 04:23
Show by Ran Chen, EA, CFP®
This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Why grab-sampling early or late discharge distorts fresh concrete test results. - How ASTM C172 requires combining portions to create a representative composite sample. - Differences in sampling approach across drum trucks, stationary mixers, paving mixers, and continuous mixers. - An original comparison of quick single-bucket sampling versus composite sampling. - Essential steps for maintaining sample identity and practicing jobsite personal safety. This independent episode provides original educational preparation for the ACI Concrete Field Testing Technician—Grade I certification exam. Practice additional questions and access prep tools at https://open-exam-prep.com/practice/aci-field-testing-grade-i and watch video guides at https://www.youtube.com/@Open-exam-prep . Sources checked: November 2, 2026: - https://www.concrete.org/certification/certificationprograms.aspx?cert=Concrete+Field+Testing+Technician%E2%80%94Grade+I&m=details&pgm=Field+Concrete+Testing - https://www.concrete.org/Portals/0/Files/PDF/JTA-FTT.pdf
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