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Why do compliance test be carried out some time after the completion of vibrocompaction?

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A process called “ageing” occurs after the operation of vibrocompaction. It is observed that sand fill shows an increase in strength and stiffness. Upon immediate completion of vibrocompaction, the apparent increase in strength of sand fill is due to dissipation of air and water pressure. Then the ageing process shall continue owing to creep and cementation.

Hence, sufficient time shall be established for ageing of sand fill to develop prior to compliance testing (such as CPT test). Otherwise, it may result in non-compliant strength and requires re-compaction.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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