Canadian Council of Independent Laboratories (CCIL) Practice Exam 2026 - Free CCIL Practice Questions and Study Guide

The correct answer indicates that the freshly mixed concrete temperature should be measured within the range of 0 to 50 degrees Celsius. This temperature range is crucial for a few reasons.

First, measuring the concrete within this specific range ensures that the material is in an optimal state for achieving proper hydration and strength development. At temperatures below 0 degrees Celsius, the risk of freezing water in the mix increases, which can lead to the formation of ice crystals and adversely affect the properties of the concrete. On the other hand, temperatures exceeding 50 degrees Celsius can lead to rapid evaporation of moisture and acceleration of the setting time, increasing the chances of thermal cracking and inconsistencies in strength.

Furthermore, this range aligns with industry standards and best practices, which consider the effects of ambient conditions on the performance of concrete. Keeping the temperature within 0 to 50 degrees Celsius helps to avoid complications such as cold-weather or hot-weather effects, ensuring the quality and longevity of the concrete structure.