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  1. blaxabbath

    SWPPP Reports

    gbam- I find your answer interesting. I am also in southern Arizona and when I worked for a heavy civil contractor, I recall the contractor being responsible for the SWPPP. When you prepare the SWPPP document, are you referring to the text document that appears in the specs only? Or does your...
  2. blaxabbath

    Utilizing ASTM F1216 for Composite Pipe Repair Systems

    dick, You are correct about the lack of compressive value in the FRP designs. They really provide the most bang for their buck in pressure situations where the external loading isn't greater than 6'-12'. I learned this week that the AWWA provided a sizable grant to a firm (I can't recall the...
  3. blaxabbath

    Utilizing ASTM F1216 for Composite Pipe Repair Systems

    dick, I am working with the manufacture data as is derived from appropriate testing. So I know the values I am plugging are correct but your point about the stand alone liner or pipe is where, I think, I need to elaborate. With the exception of ASME PCC-2 testing, which allows for a full...
  4. blaxabbath

    Utilizing ASTM F1216 for Composite Pipe Repair Systems

    As more FRP manufacturers are moving to pipe installations with carbon fiber composites, the typical design approach has been to run the F1216 CIPP calculations with the FRP properties (I also utilize the ACI 440 reduction factors but find that it generally provides little difference in the...
  5. blaxabbath

    Strengthening an Existing Girder

    An option to add tensile strength without the corrosion issue would be to apply carbon fiber laminate along the length of the span. Composite Strengthening Systems, LLC Turnkey Design and Installation Services Coming Fall 2012: COMPOSITE-STRENGTHENING.COM
  6. blaxabbath

    Assignment of Intellectual Property Clause

    It would also be prudent to review the contract with a lawyer to determine what elements of it are enforceable in your jurisdiction. When I came on board at my current company, I signed a non-compete/non-disclosure agreement. It's very broadly written and even has the language that says, "if a...
  7. blaxabbath

    Engineering as a commodity: Can we reverse the trend?

    Not to revert to the original topic too much (I'm a fairly recent grad so cannot speak firsthand about the rigors of old academia) but I had to comment because I just sat in a staff meeting Monday and my boss enthusiastically announced to my office that he was outsourcing my job. To elaborate...
  8. blaxabbath

    Kevlar decomposition temperaure

    With consideration for your system, I would study the glass transition temperature (Tg) of the epoxy you are using. When the epoxy softens, the integrity of the strength provided by the kevlar fabric (I am assuming you are using fabric here) is temporarily compromised (permanently if, when the...
  9. blaxabbath

    Outdoor Railroad Bridge FRP Repair Fire Protection

    We are designing an FRP repair to be installed on the underside of a wood beam for a timber bridge (about 6LF in the middle of the beam for flexural strengthening, so very small but over MANY beams). The bridge is out in a rural area so I have discussed with the owner possibly installing some...
  10. blaxabbath

    Carbon & Kevlar fiber Mechanical Properties

    In terms of composites versus steel, you are generally looking at: - More strength/less weight per cross sectional area - Material is generally more expensive but, at least from a civil standpoint, the savings is generally made up in reduced downtime and cheaper installation costs. -...

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