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

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What is the total mixing time for concrete according to standard practice?

5 minutes

8 minutes

The total mixing time for concrete according to standard practice is critical for ensuring that all components – cement, water, aggregates, and any admixtures – are properly blended to achieve the desired properties of the finished concrete. In general, an optimal mixing time is typically around 8 minutes in conventional concrete mixers. This duration allows sufficient time for the thorough mixing needed to ensure consistent quality and performance of the concrete.

Mixing for too short a time may result in incomplete dispersion of materials, potentially leading to weak spots and inconsistencies in the concrete's strength and durability. Conversely, mixing for too long can introduce excess air into the mix, compromising the density and overall performance. Therefore, adhering to this 8-minute guideline strikes a balance, ensuring a homogeneous mixture that meets structural requirements and standards of practice.

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