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  1. TomDOT

    Automotive paint question

    Who the heck uses an alkyd on cars? Alkyds are never going to work in a continuous wet environment.
  2. TomDOT

    The Next Step

    Shockingly, a group of engineers thinks that engineering is the best bet. [2thumbsup]
  3. TomDOT

    ADA Sidewalk Grades

    Unfortunately I wasn't part of the project, that was the explanation the city gave me when I called. Ripup was already in progress. Thanks for the brand name - I was aware of the products in general for overlay, but haven't used any.
  4. TomDOT

    ADA Sidewalk Grades

    The perfectly good sidewalk near my house had to be entirely ripped up and replaced when the road was redone, because of a cross-slope varying up to 2.1%
  5. TomDOT

    Paint calcualation to for Purchase

    Your phrasing is difficult for me to follow. If I am reading it correctly, you calculate that the actual, applied wet paint will need to be 100 liters. If you have 60% wastage*, that means the 100 liters is 40% of the paint you need to purchase. Divide 100 by 0.40 and you get 250 liters you...
  6. TomDOT

    Steel fabrication costs

    Interesting. Bridges in Texas almost never have field welding. All bolted. They are supposed to do fitup in the fab before the girders are shipped. The Margaret Hunt Hill bridge was field welded, but that was architect-driven.
  7. TomDOT

    Zinc rich spray paints on mild steel?

    VOCs regulations are orthogonal to the name of "Volatile Organic Compounds" Effectively, solvents are exempted from VOC by the US EPA because their contribution to ground-level ozone is below an arbitrary threshold. Some areas (SCQAMD) use actual ozone-forming activity for restrictions rather...
  8. TomDOT

    Zinc rich spray paints on mild steel?

    Agreed with moltenmental. Talk to the industrial rep for any major paint manufacturer and they can recommend paint systems based on a zinc-rich primer. Note that IOZ primers are typically less tolerant of over-thickness than epoxy zinc primers. I'm not sure why producers would always include...
  9. TomDOT

    Corrosion in low alloy steels

    I'm confused by your chloride levels. It appears you are saying they are less than 2 million parts per million - assuming the commas are correct, not the zeroes. Which is true of anything, even pure chloride (if you could create it) maxes out at 1 million parts per million. Corrosion resistance...
  10. TomDOT

    "E7018": a rant to designers.

    I think there are quite a few readers when there is traffic.
  11. TomDOT

    Brass Corrosion

    Ed, I think you covered everything.
  12. TomDOT

    "E7018": a rant to designers.

    Go ahead and rant in this forum Hg - it's not exactly high traffic.
  13. TomDOT

    Making rubber from dandelions

    The leaves, stems and flowers have quite a bit of latex. *shrug* If they want to deal with more expensive machinery, slower growing cycles and more contamination (dirt) - go with roots too.
  14. TomDOT

    Making rubber from dandelions

    Instead of digging up the tap roots, might just collect the tops and let the leaves resprout. Should take less energy and speed up harvests. Might manage a monthly harvest, with no replanting.
  15. TomDOT

    Making rubber from dandelions

    Cranky, usually about 7 years for a rubber tree to be ready for first harvest, then about 25 years of useful life.
  16. TomDOT

    Making rubber from dandelions

    Yeah, the concrete guys here had a presentation on chlorides for freeze resistance - they don't think the corrosion tradeoff is generally worthwhile in our environment. Entrained air microbubbles was the preferred solution. But it's certainly not a settled subject, and we have less freeze/thaw...
  17. TomDOT

    recharge cost

    Who the heck pays $1 USD per kWh for grid electricity? I'm paying $0.10 One nit: Why do you bother using Wh as a unit for most of your stuff, and kWh for the cost? Why not just use kWh throughout? If you discharge @ 5kW for 1 hour, you need 6.25kWh to recharge at stated efficiency. Around...
  18. TomDOT

    Noalox for copper to aluminum wire joints

    Even after oxidation, the zinc may do something. Zinc oxide can act as a moderate corrosion inhibitor. However, the real way to do this is to put together a bunch of connections with and without the grease, put them in a slightly harsh environment and see what happens.
  19. TomDOT

    Making rubber from dandelions

    Hm, I really don't like having increased chlorides in concrete due to corrosion issues.
  20. TomDOT

    Making rubber from dandelions

    The mountains of tires have been rapidly depleting in Texas - some for crumb rubber in asphalt, some other small uses - but most of them are going into the cement kilns as fuel.

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