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+/- 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...

It's a HPC mix (~10ksi)

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..

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...

Agreed. Thanks for taking a look.

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

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?

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...

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...

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...

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...

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?

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

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"

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?

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

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

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

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?

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...