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Recent content by iandig

  1. iandig

    How to check compaction is achieved or not

    Being based in the UK, I have to admit that the level of reliance on plate load testing is not always matched by an understanding on what the plate load test is actually measuring, let alone test laboratories not following the instructed procedure. However, if undertaken to an appropriate...
  2. iandig

    Software for rigid inclusions / settlement reducing pile design

    There are a couple of options which you can consider, dependent upon what is trying to be achieved and what is being supported. Option 1: The piles are there to support the element above, and any settlement is limited to the contribution from piles, not the surrounding ground. For the load...
  3. iandig

    Relationship between subgrade stiffness E, and equivalent CBR

    TDN appendedhttps://files.engineering.com/getfile.aspx?folder=fcdf2445-cfa6-4fe7-b157-089b2a08a57b&file=PLT-HYD-XX-ZZ-TDN-GE-0001-S4-P3_SUBGRADE-STIFFNESS.pdf
  4. iandig

    Relationship between subgrade stiffness E, and equivalent CBR

    Hello everyone I know that there are many posts relating to the use of the CBR as well as the subgrade stiffness. I have a background in construction materials testing (20 years) and have spent the last 20 years as a Geotechnical Designer/Civil Engineer specializing in earthworks and...
  5. iandig

    Use of Air Voids with a nuclear densitometer

    The use of air void contents is a guide to an end product assessment of fill, best suited for cohesive fill material. In the UK, the code of practice for earthworks would be a good starting point, BS 6031:2009, and across Europe including the UK, you also have BS EN 16907-1 TO 6: 2018, which...
  6. iandig

    Use of Air Voids with a nuclear densitometer

    If you are using the gauge to calculate the air void content direct, please be aware that the readings are not corrected to the soil under teat and that you will have to ensure you have entered the correct particle density for the soil under analysis.
  7. iandig

    Use of Air Voids with a nuclear densitometer

    The gauge will give a reading on the bulk density, moisture content (and dry density). The gauge should be calibrated against the soil, so the readings can be corrected. The results will give you the dry density and moisture content can then be used to calculate air void content, for which you...
  8. iandig

    Depth of a Shallow Foundation for Residential Homes

    Whilst you may be outside of the UK, the UK does have very clear guidance on this published by the NHBC (National House Building Council) which includes the depth of foundations, AND not limited to just considering the stiffness and bearing capacity of the soil. There is an update to the NHBC...
  9. iandig

    Importance of thickness of steel plates when load spreading

    If you change the stiffness of the plate, the stress distribution in the ground will change. See rigid, semi-rigid and flexible stress distribution figures, in all geo text books.
  10. iandig

    Impact rolling clay fill as alternative to normal sheep-foot roller compaction

    It should say 'accelerate the DISSIPATION' OF EXCESS PORE PRESSURE
  11. iandig

    Impact rolling clay fill as alternative to normal sheep-foot roller compaction

    I know there is great reliance on degree of compaction and air voids as a means of end product testing of fill, but ultimately the critical attributes for the fill would be by their end performance. I have used both rolling dynamic compaction and high energy impact compaction (e.g. Bomag BW...
  12. iandig

    Liquid Limit Vs Plastic Limit

    I think that there is either a fundamental error in the testing or the reporting. The plastic limit is the moisture at which the soil begins to behave in a plastic manner, below this moisture the soil is dry and friable. The liquid limit is the point where the soil begins to behave in a...
  13. iandig

    Lime soil mixing

    This sounds very similar to a project I am aware of. Just a note of waring, check the underlying soils below the Made Ground and make sure of their engineering performance before embarking on widespread excavation and re-engineering. If they are competant, should be OK but you should always...
  14. iandig

    Lime soil mixing

    Make sure when you do the testing you include the following: Water soluble sulfate; Acid (Total) sulfate; Total sulfur; organic content; Initial consumption of lime (add lime in 0.5% increments and measure the resultant pH, where the pH stops increasing this is the ICL, add 0.5% to this and use...
  15. iandig

    Lime soil mixing

    Sulfates, sulfates and sulfates!!! Lime treatemnt to modify soils is equivalent to drying a wet soil to an acceptable range and the long-term performance will be consistent with this. With the addition of quick lime, this will hydrate (the lime uses some of the water in the soil) and with the...
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