Do soil compaction test results over 100% mean over-compaction?

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Soils can experience over-compaction if the compactor makes too many passes over it. In fact, relative soil compaction test results over 100% do not necessarily mean over-compaction because the relative compaction is based on the maximum dry density of the soil obtained by the Proctor test and this does not necessarily refer to absolute maximum dry density.


Over-compaction is considered undesirable because it may eventually create cracks in the underlying compacted material so that it results in a decrease in density. Moreover, it causes waste of machine power and manpower which is undesirable.

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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  • julius ogowewo November 5, 2012 at 1:58 am

    in asphalt in-situ density tests, if % relative compaction is less than 100%, should engineers accept the results. what is the solution or remedies.

  • Pramod J April 29, 2013 at 2:04 am

    What is the maximum acceptable limit of compaction above 100% as per the standards?

  • Mirwais January 7, 2017 at 1:28 pm

    In our project Construction Specification degree of compaction that is at least 100 percent of laboratory
    maximum density through the full depth of the layer, What is the maximum acceptable limit of compaction above 100% as per the standards for base course?

  • Derek July 28, 2017 at 10:47 am

    I think the question is basically, at what point over 100% is it not acceptable. FDOT requires a new proctor on anything over 105%
    I personally would like to know if ASTM has a cut off point.

  • Derek July 28, 2017 at 10:51 am

    Sorry I was referring to soils. … 100% is to much for asphalt.

  • Terry Stanley March 16, 2018 at 12:10 pm

    On the average, how long would you expect a subgrade compaction to remain acceptable?

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