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  1. ridgeline

    Reinforced Concrete CTE

    +/- 25 degrees Fahrenheit. Laboratory specimens were tested for CTE. Results averaged 9.1+/-0.2x10^-6 I was able to finally track down an old ACI reference. If interested: Berwanger, C. (1971). The modulus of concrete and the coefficient of expansion of concrete and reinforced concrete at...
  2. ridgeline

    Reinforced Concrete CTE

    It's a HPC mix (~10ksi)
  3. ridgeline

    Reinforced Concrete CTE

    Perhaps for most practical applications. I am looking at a concrete CTE equal to 9.1x10^-6. Higher reinforcement ratios would be expected to have some measurable effect. I suspect an appropriate analytical approach must exist..
  4. ridgeline

    Reinforced Concrete CTE

    I am looking for a reference (preferably ACI) that details how a composite coefficient of thermal expansion (CTE) for reinforced concrete may be computed given the individual concrete and steel CTE values. I have spent several hours searching but have been unsuccessful at finding one...
  5. ridgeline

    Humidity variation over a concrete cross-section

    Agreed. Thanks for taking a look.
  6. ridgeline

    Humidity variation over a concrete cross-section

    http://www.civil.northwestern.edu/people/bazant/PDFs/Backup%20of%20Papers/164.pdf
  7. ridgeline

    Humidity variation over a concrete cross-section

    Thanks for the response. So, I understand this to mean that at any given time 't', 'h' is proportional to 'x'. Meaning they have a linear relationship?
  8. ridgeline

    Humidity variation over a concrete cross-section

    I was hoping someone that is much more skilled at math than I could help me interpret the attached equation. Basically, I am trying to understand how humidity will vary through a cross-section of concrete. I understand concrete diffusivity 'C' will degrade with time and may be represented in...
  9. ridgeline

    Humidity variation within a concrete cross-section

    Hello, I was hoping someone that is much more skilled at math than I could help me interpret the attached equation. Basically, I am trying to understand how humidity will vary through a cross-section of concrete. I understand concrete diffusivity 'C' will degrade with time and may be...
  10. ridgeline

    Product Evaluation Plan Algorithm

    I am working on developing a product evaluation plan that rates a product based on five independent parameters with differing possible range of weights. The goal is to balance all the scores and weights so that the maximum total score is achieved when all the (weights x scores) are summed...
  11. ridgeline

    Electromagnetic Wave Distance Measurement Over a Body of Water

    We often use total station instruments, which utilize electronic distance measurements (EDM), to precisely measure and monitor structures. However, I noticed when measuring and monitoring a bridge over water recently, the measured distances fluctuated significantly as compared to other...
  12. ridgeline

    Fill Existing Pool and Build Over the Top

    Client is looking to fill and existing pool and build a small garage in its place. Any experience on the best approach? Core the bottom for drainage and backfill with gravel?
  13. ridgeline

    Drying out Building Pad

    Here is the Proctor curve.http://files.engineering.com/getfile.aspx?folder=1af16af0-5e5d-4139-b931-668de7d121e1&file=Proctor_Data_Sheet.jpg
  14. ridgeline

    Drying out Building Pad

    It is undoubtedly dependent upon the soil type and weather. Just wondering what someone with a lot of experience in this industry may recommend based on their experience. Soil Classification: SM Temperature: 90High/60Low Pad Thickness: 18"
  15. ridgeline

    Drying out Building Pad

    We are testing the compaction for a building pad. Per the Proctor Test, the optimum moisture content is 8% but the pad right now is at 16%. The pad is about 18" thick. Is there a rule of thumb as to how long it might take to dry to the optimum moisture content?
  16. ridgeline

    Foundation Scour in Flood Plane

    Does anyone have a good reference for designing for foundation scour when building in a flood plane?
  17. ridgeline

    Wood Shear Wall Deflection

    What value should you use for anchorage slip (da), when calculating deflection for a wood shear wall that does not have a holddown?
  18. ridgeline

    Moment Capacity of Steel Column in Footing

    Is there a code reference for determining the moment capacity of a steel column embedded in a concrete footing? AISC, ACI?
  19. ridgeline

    Column Buckling

    If, for example, the braces could only handle 1% of the vertical load (and thus could not be considered a full brace), is it possible to analyze their potential contribution to buckling resistance? Could you possibly consider a reduction in your total unbraced length? How would you quantify that?
  20. ridgeline

    Column Buckling

    When you consider the 'unbraced length' on a column when analyzing buckling potential, how would you determine if a particular 'brace' provides enough support to actually be considered a 'brace'? For example, I have a 16' long column type memeber pinned at each end with an 8 kip compressive...

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