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  1. yaschief

    Existing Subgrade - no fill - Do you check for soil density as if it were fill.

    Use of a Nuclear Gauge to determine the density of undisturbed native soil has no value, even if they took a sample and ran a 5 point Proctor test on it.
  2. yaschief

    super-slender bldgs. in NYC

    Take a look at 785 8th Avenue...30'x90'x50' and 43 stories ... 18:1 ratio...my firm designed the structure.
  3. yaschief

    Plug welds to fill in holes in baseplate (brace frame)?

    If the abandoned holes do not interfere with the new holes, leave them be...if they conflict or are within an inch, install a square washer over the new hole and the old one with a 1/2" lap and weld all around the lap joint.
  4. yaschief

    Damaged threads

    Looks like Galling to me.
  5. yaschief

    Concrete fall height

    The are made of HD Plastic and are 12" but can be oval in the wall. They put a weight on the end to make sure they go down far enough. they can be cut to length and are considered a disposable item,. Large square funnel attachment goes on the top. I have attached a catalogue page from a local...
  6. yaschief

    Concrete fall height

    We have jobs we design where the walls are 26 ft and we limit vertical drop to 14 ft. This requires the contractor to use a snorkel pipe to place the concrete to prevent segregation of the aggregate from the cement. Vibration is an issue due to the height so they could use formwork vibrators...
  7. yaschief

    Currogated Iron Arch Flooring

    What I have seen here in NYC in Schools and Municipal buildings of the age is they used corrugated metal panels spanning from beam to beam at web/bottom flange angle in an arch. Filled on top with Cinder concrete. We do not even attempt to repair in kind, we rip it out and do standard reinforced...
  8. yaschief

    Currogated Iron Arch Flooring

    I have seen this sourced in NY/NJ area as it is used to repair NYC Schools built in 1920-1930's that used this system. I was told it is available from most suppliers as it is used for temporary construction dams and such. Is there a specific reason you have to use the original product/modern...
  9. yaschief

    Rebar Corrosion - how to distinguish active or not

    Looks like nothing more than average mill scale surface rust and no loss of section is visible.
  10. yaschief

    Concrete Pedestal: Too Short

    Non Shrink Grout with 1/4" Pea Stone as aggregate placed in one lift would be acceptable.
  11. yaschief

    NDT percentage clarrification

    The way I have interpreted this spec is 20% of all welds to receive MPI translates to 1 in 5. But also reference the requirements for failure which may increase the amount of welds to be inspected.
  12. yaschief

    Complete penetration weld Vs Full penetration weld

    A "full depth partial penetration weld" is a PJP no matter what you choose to call it but calling it a "full penetration weld" is asking for trouble. Only a Complete Joint penetration weld is a CJP. Change you use of "full depth partial penetration weld" to describe something that IS NOT a CJP.
  13. yaschief

    Concrete Cube Test vs. Cylinder Test

    General Rule in USA is Cylinders (6"x12" or 4"x8") for Concrete and Cubes (1"x1" or 2"x2") for Mortar/Grout with some labs doing Cylinders for Grout (3"x6").
  14. yaschief

    For True Stoners

    As was said in "The Incredibles" There is no school like the old school!
  15. yaschief

    7 days compressicve strength of concrete core is higher to 28 days.. surprising?

    Having been the guy on the core drill more than once in my career, I can opine on this: 1) After the core was taken did they techs allow the core to dry out or was it protected as per ACI specs? (More than once I have seen cores stacked in an empty bucket and then in the back of the truck). 2)...
  16. yaschief

    Thank you all for your help. - New CWI

    Welcome Aboard! The first round is on you![thumbsup2]
  17. yaschief

    High strength bolt installation question

    Bolt Head should be marked with Makers mark, ID (AA325TC or A490TC) and Nut/Washer marked as well. Connection requirements should be noted on erection plans. also check notes and local regs for inspection requirements -Observation, Skidmore qualification of bolts and bolting gun(s, etc. Minimal...
  18. yaschief

    NDE for fillet weld

    Define "I want to check the whole weld"...what exactly are you looking for?" a) Inclusions b) To define the HAZ boundary c) Cracking d) ?? A combo of UT and MP can be done or RT if available but UT/MP is faster cheaper safer
  19. yaschief

    Testing FF/FL Prior to Saw Cutting

    Your obligation to perform FF/FL verification does not override the contractors obligation to perform saw cutting within 12 hours as per code. I have been on both sides of this issue as an Inspector and as a Contractor. Saw cutting should not affect FF/FL Verification as the saw cuts only go...
  20. yaschief

    What's the deal with A325M bolts in US?

    Did you think about reverse import from the approved manufacturer? We had to do this for a job and found a dealer in SA who had the items by the approved manufacturer in stock and it worked out well in the end.

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