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  • Users: SirAl
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  1. SirAl

    Is it possible to compact soil to 100% as per ASTM D698?

    Not terribly difficult to achieve at moisture contents close to optimum moisture.
  2. SirAl

    Shrinkage factors for sand

    Shrinkage factor 15% Insitu dry density maybe 95% SPD but will vary
  3. SirAl

    Concrete cylinders testing and fracture type

    Agree with Ron. Theoretically you should see a conical failure as lateral strain on the top and bottom of the specimen is restricted by friction against the loading plates which would result in bulging of the mid area of the specimen.
  4. SirAl

    questionable proctor results

    Looks like bentonitic material. Difficult material to test - may require longer soaking time for each point.
  5. SirAl

    Geotechnical engineering book in French

    I would try any book store at one of the many Quebec based universities and colleges Just 1 of many, this one came to mind http://www.polymtl.ca/
  6. SirAl

    Max Ground Pressure / Bearing Capacity

    At 0.9m of 75 to 100mm rock with 0.3m of 20mm crush topping; you should have 200kPa brg easy. The photos are a good attribute.
  7. SirAl

    Stresses in a buried pipe

    You can also find relevant information at this site: http://www.dipra.org/
  8. SirAl

    Non-destructive methods to measure pavement structure?

    Can be a big undertaking to establish and maintain a database. Ground penetrating radar might be the best NDT approach to obtain pavement structure thicknesses although nothing can replace borings or cores where actual road structure thicknesses and subgrade can be measured and categorized.
  9. SirAl

    Meaning of Passes

    Interesting input to a simple question. I agree that it is not or at least should not be a spec. It is a terminology thing though, and I run in to the same question occasionally. When proof rolling I like to see a loaded vehicle pass the prepared area in at least 2 directions. Same thing when...
  10. SirAl

    Compaction

    You should monitor the compaction of intermittent lifts. Adequate compaction of material below grade is important to avoid excessive settlement. Testing frequencies are commonly specified by a local/municipal authority or, on private sites, the project specifications. As the others have...
  11. SirAl

    Meaning of Passes

    I consider a single pass as there and back. Canada, eh.
  12. SirAl

    Concrete thickness versus load

    The PCA (Portland Cement Association) has a good guideline for this kind of application. http://www.cement.org/bookstore/profile.asp?id=235 For supplementary information, I commonly obtain the technical specs for the forklift being considered. The specs will provide the vehicle wt, tipping...
  13. SirAl

    Asphalt Compaction Issue

    I would only apply nuclear density testing of ACP during construction to help obtain an optimum rolling/compaction pattern or, possibly to obtain a general idea of the compaction in much the same way that rebound hammer results would be applied as a qualitative measure of concrete compressive...
  14. SirAl

    Rubble stone foundation underpinning project planning (overview)

    Underpinning, to me, implies that there is an existing foundation requiring additional support to fix a problem or to carry additional load. Perhaps start with defining what the underpinning is to provide and, if known, summarize the soil conditions inherent to the site.
  15. SirAl

    Negative Skin Friction?

    Negative skin friction is usually associated with settling soil relative to a pile that extends through and to depths well below the settling zone. The settling material imposes a downward force on the pile shaft. There are a number of semi-empirical formulas that can be considered to estimate...
  16. SirAl

    Exception for footing subgrade inspection

    Sometimes it is the small add-ons or similar modest projects that can open up unforseen adverse conditions. Former excavations, in-fill, landscaping, old utility trenches, drainage issues, etc. Dry, crusty, poorly compacted fill will settle when moisture softened, no matter how conservative the...
  17. SirAl

    Aggregate Base and Subbase Lift

    As usual, Ron provides good guidance. I would suggest that 6" lifts are OK with material upto 3/4" in size although you have to be careful with segregation as you lay out the larger sizes.
  18. SirAl

    Forensic investigation for loose aggregate

    Thanks for the photo. It would not appear to be a large area justifying a costly testing program. Its hard to get a handle on the depth affected from the photo provided. To rectify the deficiency I would probably have the pavement within and surrounding the affected area ground uniformly to...
  19. SirAl

    Pavement design using roller-compacted concrete

    BigH - Agreed, the mix, delivery, and placing of RCC are very much the same as CSBC, more powder though. Other than that, not a whole lot different. CSBC was used here for years as the base structure (or component thereof) for road pavements. The main draw back has been seasonal movements in...
  20. SirAl

    Forensic investigation for loose aggregate

    We recently cored a segment of ACP along a taxiway subject to fuel spill leaking from a fuel truck (malfunctioning valve) returning to its docking station from the apron after fuelling an airplane. Upon examination of the cores it was amazing to see the depth of impregnation of fuel as the...

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