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  1. MikeManning

    Add Delay to Every 2nd Load of Concrete?

    @TLHS - It's a "strong floor" for a university, which will be used for load testing. It's about 6' thick, slammed full of bar, 65MPA concrete, also needs to be FF100... going to be an interesting pour! We did a mockup to see the temperature gain of the mix, and we are approaching 70degrees C at...
  2. MikeManning

    Add Delay to Every 2nd Load of Concrete?

    I'm wondering if anyone has come across this idea before. I'm involved with a project doing a very high strength Mass Concrete pour. We did an insulated mockup to study the heat rise through hydration, and we are pushing the limits of temperatures in the range of DEF. So we are now exploring...
  3. MikeManning

    Depth of Sawcut?

    Thank you dik and other commenters! My biggest takeaway is the importance of TIME as part of this equation. I wonder if we miss that critical element while technically still "meeting spec". So that's helpful to know!
  4. MikeManning

    Depth of Sawcut?

    Hi all, I work for a large General Contractor, and one thing that we see a lot is cracks in slabs outside of the contraction joints. We typically get blamed for these cracks, and while the blame is rightfully ours some of the time, there's a decent portion of these issues where we followed the...
  5. MikeManning

    Reverse Deflection in Cantilevered Balconies?

    @FE_struct1 Really interesting idea there with column shortening. Most of the high-rises we deal with are in the 30--40 story range - and I think generally we've seen leaks on lower floors. Would columns near the interior of the building be more likely to shorten than those around the exterior?
  6. MikeManning

    Reverse Deflection in Cantilevered Balconies?

    @FE_struct1 Thanks for this. The scenarios that we see are columns and flat slabs (consistent 8" thick, no beams or thickened areas in the slab, and no 1" drop at the balcony, which would be nice I admit), most often with spans of 20' between columns in either direction, and balconies that...
  7. MikeManning

    Concrete Cover at the Drip Edge?

    Thanks all!
  8. MikeManning

    Reverse Deflection in Cantilevered Balconies?

    Bridgesmith, I should clarify that this is suspended slab construction, with wood formwork and shoring that gets removed after the concrete has cured, so deflection does take place after everything is set.
  9. MikeManning

    Concrete Cover at the Drip Edge?

    Another balcony-related question. Something we see all the time is the example attached - a slab designed with minimum cover for the bottom mat of rebar, and then right next to it, a note calling for a 1" recess for a drip edge. Presumably, the area where the drip edge is will not have the...
  10. MikeManning

    Reverse Deflection in Cantilevered Balconies?

    Thanks for the quick replies. I'll have to look up "Hogging". But yes this sounds like exactly what I was thinking. Finishers finish in the shored condition, and then shoring is removed and everything deflects. That's why we're always careful, when there are flatness or levelness specs on...
  11. MikeManning

    Reverse Deflection in Cantilevered Balconies?

    Hello, I work for a large general contractor, and we do a lot of high-rise residential concrete construction. I'm working on a bit of a guide to good balcony design (for waterproofing purposes) in these buildings, and I've got a theory, which might be totally out to lunch (which is why I'm...
  12. MikeManning

    Void Form vs Underslab Suspended Piping

    Hello, I've been looking around for info on this subject but haven't found much. Here is the setup. - We are working on a project, acting as Construction Management with design input. The design is not fully complete. - Our building will have underslab radon collection, and will also have...

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