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  1. archprecast

    precast bearing on grade beam

    Is the bearing direct onto the grade beam, or are bearing plates cast into the grade beam? While a loose bearing plate theoretically spreads the load at the bearing point, in reality the plate sits non-uniformly on high points. You may want to use elastomeric or similar bearing pads to be sure...
  2. archprecast

    Dissimilar metals

    I posted a sketch at http://www.flickr.com/photos/60807902@N00/429657627/ to be more clear about the detail. In terms of the potential for water to get to the insert, it is more extreme than typical because one side is below grade. I am concerned about the "decades" issue. I've never seen a...
  3. archprecast

    Dissimilar metals

    Precisely. www.caryconcrete.com
  4. archprecast

    Dissimilar metals

    The application is exterior and is used to connect a small pier or precast curbing to a foundation or coping to a parapet. The bed joint is mortar filled. So in reality, I'd say there is potential for moisture to get there, but not water since the contact takes place above the bed joint within...
  5. archprecast

    Dissimilar metals

    I know that in general dissimilar metals are problematic and to be avoided. My specific question is about the pair: zamac and stainless steel. The specific use is a zamac female nut body (Star threaded insert, similar to a closed barrel nut) embedded in concrete and receiving stainless steel...
  6. archprecast

    Shop Drawings - History and Origin

    SlideRuleEra - thanks for the Smithsonian link. I too found it interesting, but not germane in that I am concerned with shop drawings only in the context of the construction industry. There were no such examples in the exhibit. sundale - I too have been struck by the quality of old drawings...
  7. archprecast

    Mobile Crane Outrigger Pad Loads

    In many cases, the crane rental company has software to do that analysis. I got crane+load specific answers from the dispatcher. However, in many cases cribbing or something else is used between the pavement/surface and the outrigger pad in order to spread the load. Cranes often crack slabs...
  8. archprecast

    bending AISI 304 or 316 threaded rods for stirrups

    We have used 1/4" stainless for reinforcing with no problem. www.caryconcrete.com
  9. archprecast

    Shop Drawings - History and Origin

    Thanks, JAE, but they do not touch on the question of when they first arose as a common practice. www.caryconcrete.com
  10. archprecast

    Shop Drawings - History and Origin

    Anyone have resources you can point me to on the history of shop drawings in construction? When did they first begin to be used by various trades and why? Often when I look at old contract drawings, they seem very complete. And so I wonder when shop drawings arose. www.caryconcrete.com
  11. archprecast

    Dry cast

    In US, the relevant trade association is the NPCA, National Precast Concrete Association. They have some resources at http://www.precast.org/ But I think the sales rep for the machine you are using is your best bet, as the mix must be matched to the machine. I assume that "transport" concrete...
  12. archprecast

    Dry cast

    First off, depends on what you want to dry cast - it is used for pipe, for pavers and tiles, for curbs, and for cast stone (small architectural products), and perhaps for other items as well. For cast stone, there are trade associations in both the US and the UK. Both are called the Cast Stone...

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