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

Question: 1 / 400

For concrete with a strength above 35MPa, how long should sulphur mortar caps be allowed to harden?

2 hours

8 hours

12 hours

16 hours

For concrete with a strength exceeding 35MPa, it is recommended to allow sulphur mortar caps to harden for a duration of 16 hours. This extended hardening time is essential to ensure that the sulphur mortar achieves its full strength and effective bonding with the concrete specimen before any testing takes place.

Sulphur mortar caps create a level bearing surface, which is crucial during the testing of concrete samples to obtain accurate compressive strength results. The 16-hour period allows the sulphur to solidify properly, minimizing the risk of deformation or failure during testing.

Selecting a shorter period, such as 2, 8, or 12 hours may not provide adequate time for proper hardening, potentially leading to compromised test integrity and inaccurate results. In laboratory practices, adhering to the recommended hardening times is vital for maintaining the reliability of the data collected.

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