ACI Concrete Field Testing Technician - Grade I 2025 – 400 Free Practice Questions to Pass the Exam

The correct dimension for the strike-off bar is 1/8 by 3/4 by 12 inches. The strike-off bar is a tool used in concrete testing, particularly during the molding of test specimens, as it helps ensure an even surface and proper consolidation of the concrete mix within molds.

The specified dimensions of 1/8 inch for thickness allow for a rigid yet manageable tool that can effectively scrape and level the surface of the concrete without causing excessive disturbance to the sample. The width of 3/4 inch provides adequate contact area to ensure that the material is effectively leveled, while the length of 12 inches is practical for use in the typical molds utilized in field testing, allowing the technician to apply proper pressure and control during the strike-off process.

Other dimension options either exceed typical standards for field testing tools or do not provide the ideal balance of strength and usability needed for effective concrete sampling and testing.