Canadian Council of Independent Laboratories (CCIL) Practice Exam 2025 - Free CCIL Practice Questions and Study Guide

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What is the diameter requirement for a tamping rod used for 100mm x 200mm cylinders?

5mm +/- 1mm

10mm +/- 1mm

The diameter requirement for a tamping rod used for 100mm x 200mm cylinders is established to ensure proper compaction of concrete within the molds. The standard specification for the tamping rod is that it must have a diameter of 10mm with a tolerance of plus or minus 1mm. This size allows the rod to effectively compact the concrete without being excessively large, which could lead to inadequate distribution or excessive voids within the mix.

Using a tamping rod of this specification ensures that the concrete achieves the appropriate density and strength as intended in the testing procedure. The specific size also aligns with industry standards, which are established to foster uniformity and consistency across concrete tests. Deviations from this size could result in unreliable test results and affect the integrity of the sample being produced.

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15mm +/- 1mm

20mm +/- 1mm

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