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

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How long must sulphur mortar caps harden before testing concrete with a strength of 35MPa or less?

1 hour

2 hours

Sulphur mortar caps are utilized in concrete testing to ensure a uniform load distribution across the specimen's surface during strength testing. For concrete with a strength of 35MPa or less, the proper hardening time for the sulphur mortar caps before testing is critical to achieving accurate and reproducible results.

The hardening period of 2 hours is recommended to ensure that the sulphur mortar achieves sufficient hardness and adheres well to the test specimen. This timeframe allows for the mortar to solidify and adequately grip the ends of the concrete sample, minimizing the chance of slippage or misalignment during the test. Insufficient hardening could lead to premature failure or inaccurate strength measurements, thereby compromising the integrity of the testing process.

This approach reflects standard practices within the field and reinforces the need for careful preparation prior to conducting strength tests on concrete samples.

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