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

The average specimen density for a mix design of plastic concrete should be within the range of 98-102% of the specified density. This range indicates that the concrete has achieved the desired level of compaction and consistency, which is crucial for the performance of concrete in structural applications.

Specifically, achieving a density within this range suggests that the materials have interacted well, resulting in minimal voids and optimal strength characteristics. Such density ensures that the concrete can effectively support structural loads and resist various forms of degradation over time.

A density below 98% could indicate insufficient compaction or improper mix proportions, potentially leading to weaker structural integrity. Conversely, exceeding 102% may suggest over-compaction or an overly wet mix, which can introduce reliability issues, such as potential segregation of materials or increased vulnerability to shrinkage cracks. Therefore, the specified range is essential for ensuring that the plastic concrete mix is both strong and durable.