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  • Users: DwayneM
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  1. DwayneM

    Construction Joint in Columns

    Hey y'all, In placing columns (26" and 48" dia) with embedded steel rings w/ studs (See Figure), it's necessary to break the concrete placement into two placements, possibly with as much as an hour between the two. Where would you recommend they break the placement, and why? Would it matter...
  2. DwayneM

    Received an offer to leave present employer

    *all names have been changed... yada,yada..* I work for TS LLC as a civil engineer. It's a small (4 PE's) firm, and when I was hired as the 4th, I was told it was because of my experience with EPA projects, having worked for a time for the EPA directly, because the firm expected to land a...
  3. DwayneM

    Concrete Crack Repair

    I've been asked to propose a solution to a concrete cracking problem. A pile-supported concrete floodwall, about 9' high, was constructed around a site. To provide a working surface, the contractor had cast a 9" pad along the footprint with no joints. Of course the floodwall has joints at 50' or...
  4. DwayneM

    CTE Coating and pile friction

    Does coal tar epoxy coating appreciably diminish the load capacity (vs bare steel) for an H-pile? I don't see where the coeff. of friction would vary much between the two. Thanks!
  5. DwayneM

    110V 50 Hz motor on 120V 60 Hz home circuit

    I have a piece of equipment manufactured in China; the manual describes the drive motor as 110V, 50Hz 200W. Would it be ok to run this on standard US residential wiring (120V 60Hz)? I figure the motor would be pulling 1.6A instead of 1.8, so I'm not worried about harming the home wiring. Would...
  6. DwayneM

    Steel pile corrosion compensation

    I am assigned to evaluate a design where steel piles (HP section) are being used to support a concrete structure on a recently constructed embankment. The clayey soils are going to settle, possibly a few feet over the design life. The designer has elected to not paint or coat the upper portions...

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