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According to CCIL guidelines, the maximum aggregate size applicable for slump tests is 40mm. This specification is important as larger aggregate sizes can affect the results of the slump test, which measures the workability or consistency of concrete. The slump test relies on the concrete's ability to flow and settle under its own weight, and larger aggregates can hinder this process, leading to inaccurate measurements.

Using a maximum aggregate size of 40mm ensures that the concrete mix will behave predictably during the slump test, allowing for a reliable assessment of its workability. In practice, adhering to this guideline helps in maintaining quality control during the mixing and pouring stages of concrete work.