Canadian Council of Independent Laboratories (CCIL) Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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What does a biphasic slump indicate about the concrete?

Good bonding quality

Poor consistency

A biphasic slump in concrete refers to a situation where the concrete sample shows two distinct phases when subjected to a slump test. This characteristic typically indicates that the concrete has poor consistency. When concrete has a biphasic slump, it suggests a lack of uniformity in the mixture, which can result from inconsistencies in the proportions of its components, such as aggregates, cement, and water.

This inconsistency could lead to issues with the concrete's performance, including its strength, durability, and workability. Therefore, recognizing a biphasic slump as a sign of poor consistency is crucial for ensuring that the concrete mix is properly designed and mixed to meet performance requirements. Understanding this helps in taking corrective measures to achieve a more homogenous mix that will perform reliably in construction.

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High water content

Excellent workability

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