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

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How long should flexural test specimens initially cure before demoulding?

24 +/- 4 hours

48 +/- 4 hours

The recommended initial curing time for flexural test specimens before demoulding is approximately 48 hours, with some acceptable variability of plus or minus 4 hours. This time frame allows the materials to gain sufficient strength and stability, ensuring the integrity of the specimens for accurate testing results.

Demoulding too early could lead to structural weaknesses and inaccuracies in the flexural strength readings. At this stage, the concrete or composite material will have undergone enough hydration to form a solid bond without significant risk of damage during the demoulding process. Although some materials might appear set before 48 hours, proper curing is essential to achieve optimal performance in subsequent tests. Different curing durations can impact the effectiveness of the material and can lead to varying results in tests conducted on the specimens.

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72 +/- 4 hours

96 +/- 4 hours

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