Canadian Council of Independent Laboratories (CCIL) Practice Exam 2026 – All-in-One Comprehensive Guide to Exam Success!

To determine the correct number of strokes per lift for a 150mm cylinder when rodding, it is essential to understand the principles of proper compaction in concrete testing. Rodding is the process used to compact concrete in a cylinder mold, ensuring that air pockets are minimized, and the concrete is evenly distributed.

For a 150mm diameter cylinder, the most commonly accepted standard in concrete testing specifies the need for a precise amount of rodding to achieve the necessary compaction. The industry standards recommend a specific number of strokes that effectively consolidate the concrete without causing segregation or excessive disturbance.

In this scenario, the calibrated requirement for a 150mm cylinder typically indicates that 25 strokes are optimal. This number allows for adequate consolidation of the mix to meet testing specifications and ensures the integrity of the sample being tested. Too few strokes may leave air pockets, while too many can disrupt the mix's uniformity.

As a result, the choice reflecting 25 strokes per lift aligns with established practices within the Canadian Council of Independent Laboratories and the broader field of concrete testing.