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Recent content by Jameschen6

  1. Jameschen6

    Hot Mix Asphalt Pavement Compaction

    What is the consideration they have taken to remove the upper limit?
  2. Jameschen6

    Hot Mix Asphalt Pavement Compaction

    Thank you Eirechch, My question is about the Asphalt pavement compaction. The old version of OPS standard had a requirement of field density 92-96.5% of MRD. A couple of years ago (maybe more than 2 years), The OPS was updated with requirement of the compaction 92% and up. They removed the...
  3. Jameschen6

    Hot Mix Asphalt Pavement Compaction

    As Previous OPS Standard, The pavement compaction (Field density)requirement is 92-96.5%. As the concrete placement which there should be air content if the concrete placement exposed to the freezing condition. The asphalt 92-96.5% has be understood this way for a long time. Now the OPS standard...
  4. Jameschen6

    Concrete Cylinders Initial Curing

    As a consultant we cast and test the concrete cylinders. recently cylinders from a high rise construction site have some low 28-day strength. from time to time I can see the supplier casting their cylinder too onsite. Even though the situation has not be improved. about 30% of the specimen still...
  5. Jameschen6

    House addition settlement

    Toronto
  6. Jameschen6

    House addition settlement

    Thank you oldstguy and Ron. A couple of times I were in such cases as a footing inspector and did not pay any attention for the structural design. Ontario Building Code defines soil bearing capacity of 75kpa for house. When you said proper design and addition islation, does that mean that the...
  7. Jameschen6

    House addition settlement

    This is a imaginary question. In a discussion forum one guy talked about differential settlement for a house addition against original portion. I am a geotechnical person. My feeling is that what he spoke are not in point by enlarging the problem. His main concept is that all house will need a...
  8. Jameschen6

    Proctor Test with 6 inch mould

    When testing a granular material, it required to test portion passing 19mm sieve (26.0mm for Ontario). How much material is needed for the moisture testing for such grain size material? Many times the curve appear in odd shape due to the moisture results. What is your comments
  9. Jameschen6

    Hydrometer

    I follow the Standard MTO LS 702 which I believe to be based on D422. Generally, (a) the soil need to be air dried, (b) at least 16 hours dispersion, (c) 1, 2, 5, 15,30, 60, 250 and 1440 minutes readings. These 3 steps are time consuming.(a) may be speeded up slightly by putting sample in low...
  10. Jameschen6

    Hydrometer

    Hello everyone, A couple of times my boss mentioned a simplified hydrometer method. He said the method I use is very old and costly. But I am sure the way is still in the standard. He can not remember the exact name (may have phrase overnight). I search internet and have nothing clue for such...
  11. Jameschen6

    Shear Vane Tests

    It is noticed that the ASTM has formulas for: A - the rectangular shape of (1) general and (2) H=2D B - the tampered shape of ONLY H=2D Unfortunately our vane is tampered with d=1 inch, D=2 inches, H=5 inches. Is there a formula for this Vane?
  12. Jameschen6

    Need help on hydrometer test

    OK, Let simplise the question. The pH is 6.65 measured imediately after the making of the solution. Should I adjust the pH by mean of Sodium Carbonate?
  13. Jameschen6

    Need help on hydrometer test

    I am in Toronto
  14. Jameschen6

    Need help on hydrometer test

    I have never used the Sodium Carbonate before for the test. I have alwasys made the solution on the day I need. The pH of the disperse solution of the one I made today was 6.88. (48g/L). Why it is so low or it is suposed like this. I need Sodium Carbonate, right? I checked my supplier websites...
  15. Jameschen6

    Hydrometer Test Review

    Thank you RJP78. We do not do the Hydrometer very offten. The solution was always made before the test (Same day or one day before). Honestly I have never checked the pH of the solutions.As required by the MTO, all laboratory should use 48g/L and SG 2.785 for year 2010.
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