Canadian Council of Independent Laboratories (CCIL) Practice Exam 2025 – All-in-One Comprehensive Guide to Exam Success!

The term "table/plank type" specifically refers to external vibrators. These vibrators work by being placed on or under concrete forms, such as tables or planks, to enhance the flow and consolidation of the concrete mixture. They are designed to provide surface vibrations, which help in reducing air bubbles and improving the overall density of the concrete. This results in a smoother and more durable finished product.

External vibrators are particularly useful in scenarios where access to the interior of a concrete form is limited or impractical. Their operation can be more efficient for larger areas, where the distribution of vibration across the surface is needed to ensure even settling of the material.

Internal vibrators, in contrast, are inserted directly into the concrete mix during pouring. Hand-held vibrators are typically smaller and lighter for manual use, while screw vibrators are designed for specific applications, such as bulk material movement. Understanding the distinctions among these types helps in selecting the right vibrator based on the nature of the project and the characteristics of the concrete being used.