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Recent content by enriko12

  1. enriko12

    Moisture barrier for painted slab below grade

    Does anyone wrap the moisture barrier around slab edges? Slab is 9" thick and 24" below grade. Its above water table, but location is kind of damp and sheet of vapor barrier left on the ground will show drops of water on the underside in less than a day. Would enough moisture migrate into the...
  2. enriko12

    Moisture barrier over slab edges

    Does it make sense to wrap moisture barrier up and around slab edges and sealing all the joint and gaps to make it virtually air tight? Location is kind of damp and sheet of vapor barrier left on the ground will show drops of water on the underside in less than a day. Would enough moisture...
  3. enriko12

    Help identifuying soil

    It does feel like clay, really sticky one. What would make it so black? Organics?
  4. enriko12

    Help identifuying soil

    Hi, have you guys seen anything similar and/or have any idea what kind of soil is that?
  5. enriko12

    Steel column hairpin rebar

    You were right on point! 8' wall (it actually turned out to be 6'8") does not have much steel in it. After examining a construction joint over upper 4ft, I was able to locate a single horizontal bar (#4 or #5) about 6" down from the top. Jim, you seem to be very familiar with typical 1980s...
  6. enriko12

    Sub-grade preparation for Vibration Isolation

    Now you are giving me a really hard time. Yes, soils are outside of my area, that's why I am asking. Is not it what this board is for, so engineers can exchange ideas and experience to help each other out? Neither contractor no suppliers know what GW, GP, A-1-a etc stands for. They speak a...
  7. enriko12

    Sub-grade preparation for Vibration Isolation

    We seem to have trouble with sourcing GW type soil in Indianapolis area. No one ever heard of it. Here is an example of whats available: https://irvmat.com/AggBoardPrices.pdf Is there a different name for it? Would #53 or #73 limestone work?
  8. enriko12

    Sub-grade preparation for Vibration Isolation

    Not enough height clearance, that's why the idea was to go deeper
  9. enriko12

    Sub-grade preparation for Vibration Isolation

    The only risk mitigation thing I came up with so far is doing it in sections, excavating on 1 side of the column and back filling, and then excavating the remaining part. I am worried about compaction process even more than excavation itself, would not the force from plate tamper cause...
  10. enriko12

    Sub-grade preparation for Vibration Isolation

    The pit is at 24" now, the guy removed not just the slab, but also sand and some of the dirt along with the concrete. Actually, I suspected possible hairpins, so told him "no cutting" in that area and to watch out for possible rebar and to carefully preserve it. I was hoping not to find them...
  11. enriko12

    Sub-grade preparation for Vibration Isolation

    Considering dead load only, I am getting SF=2.6 against overturning, 1,900 psf / 0 spf on the edges (4.2 ft bearing length). This is with 0 soil cover on the inside, and zero lateral earth pressure. Adding the moment from lateral earth pressure on the outside would somewhat help to reduce the...
  12. enriko12

    Sub-grade preparation for Vibration Isolation

    By the way, here is the mentality I am dealing with: Suggestion 1: Lets double the concrete thickness and add 1 more layer of rebar - Awesome idea, go ahead! Suggestion 2: Lets hire a specialized consultant and order soil borings - Are you out of your mind? I don't have a budget for that!
  13. enriko12

    Sub-grade preparation for Vibration Isolation

    Things are getting more and more interesting. Now they want to lower the entire thing 1ft deeper to gain extra height on top and to bring the sewer and water pipes above the tub floor, otherwise they end up right in a middle of the slab. Also turns out footing depth and size were not probed...
  14. enriko12

    Sub-grade preparation for Vibration Isolation

    So lets say we have a 2ft or so of well compacted GW gravel covering entire area and then 1 common slab taking most of the area (partition walls, personnel, non-sensitive equipment), 1 isolated thickened slab (sensitive equipment), and 1 smaller thickened isolated slab (noisy equipment such as...
  15. enriko12

    Steel column hairpin rebar

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