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

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What is the maximum interval for internal vibration along the centerline of flexural specimens?

100mm

150mm

The maximum interval for internal vibration along the centerline of flexural specimens is set at 150mm to ensure proper consolidation and measurement of structural integrity throughout the material. This distance allows for adequate vibration intensity and uniform distribution of energy along the concrete cross-section, which is crucial to prevent air pockets and achieve homogeneity in concrete samples. Maintaining this maximum interval is also important for meeting industry standards and ensuring that the specimens can effectively replicate in-field conditions.

Intervals greater than this can lead to inadequate compaction in certain areas, which may jeopardize the reliability of the flexural strength tests, potentially resulting in misleading test results. Thus, 150mm is established as a standard maximum to balance effective vibration with practical consideration of specimen size and material behavior.

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200mm

250mm

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