ACI Concrete Strength Testing Technician (CST) – Practice Questions & Answers with Rationales (2025 Edition)

ACI Concrete Strength Testing Technician

Practice Questions (Original) – With Answers & Rationales

1. Which ASTM standard governs making and curing concrete test

specimens in the field?

A. ASTM C39

B. ASTM C31

C. ASTM C42

D. ASTM C617

Answer: B

Rationale: ASTM C31 covers mold...