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Recent content by pug

  1. pug

    epoxy coated rebar

    Hey Dave You also have some bridges that are new and closed like the 20 million dollar millineum bridge no? There are old bridges here as well for the same reasons as you have old bridges. The engineering community didn't have the knowledge that we have today so they were cautious resulting...
  2. pug

    Concrete C uring Rates

    Theoretically, yes, still gaining strength but practically, no. You picked the hoover dam and that is interesting because the saturated in fresh water portion may be fully cured (~99.99999%) at this stage but the outside air dried portion may still not have fully hydrated. It is surprising how...
  3. pug

    Concrete Box Innovation

    Precast concrete boxes have trouble competing against multiplate due to transport costs. If the box was twice as light, then it would be able to compete twice the radius. Any thoughts on ribbed walls on the inside? Yes, detractors would be reduced capacity, less abrasion resistance and more...
  4. pug

    Concrete Rigid Frame and Box Culvert Differences

    I live in a cold climate. Frost can be up to 12 feet deep under a highway that experiences the application of salt. The fill around a concrete box is also frozen about 2 to 3 feet around it if the wind blows through it periodically (except the floor). The warmest it gets is about 65 F inside...
  5. pug

    Fatigue Cracks

    How much bridge experience do you all have? Just want to know who I am talking to and at what level. Sadly, I don't get an opportunity to be at this site more due to other thought grabbers. But would like to get into a good topic and thus move other things aside. Thanks
  6. pug

    Fatigue Cracks

    Whoops. I thought there was a way on this site to email direct. You can email me at pug_bb@hotmail.com. Thanks for pointing it out.
  7. pug

    Fatigue Cracks

    PS I also have 25 years experience in all elements of bridges so can discuss many topics and not just fatigue cracks.
  8. pug

    Fatigue Cracks

    I have been inspecting steel bridges for fatigue cracks for several years now using ultrasonic. I would like to discuss some of my theories with someone who also has plenty of experience in this area. Could you please email me and we can possibly both gain. Is there anywhere else where I can...
  9. pug

    epoxy coated rebar

    I had a chuckle over the 120 year life. First, bridges might be in museums by then. Furthermore, sufficiency criteria will be vastly different in 50 years let alone 120. Never heard of loads getting smaller or speeds becoming slower for example but always in reverse. Initial cost being kept...
  10. pug

    Is aphaltic coating for substructures necessary?

    The coating is to keep the de-icing salts out of the concrete. Todays methods are to use either waterproof joints or good plumbing under open joints so that the de-icing salts do not contaminate the cap. Therefore, no asphaltic coating is required. Besides, where needed, a non-penetrating...
  11. pug

    epoxy coated rebar

    Have used epoxy bars for 20 years in bridge decks. Results are disappointing. Hot spots eat through the bar while normal corrosion is scaling variety over a longer area and not as deep. I would sugest putting your money in a waterproof deck system for bridge decks.
  12. pug

    Timber Bridge Preservation

    I would not use untreateded wood in structural elements period. As a wearing surface, use untreated wood and replace every ten years. The fisheries followup is essential as mentioned earlier.
  13. pug

    Concrete Placement in Sub Freezing Temperatures

    rjeffry was right on the money and a better solution. Insulated tarps on the top and insulation against the underside of the metal decking. I have poured slabs like this and have had to occasionally let some cool air in. It will stay warm a minimum of 3 days if insulated properly.
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