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  1. kronosconcrete

    Concrete- mixing magnetic water

    Can't imagine why that would be any problem. Nothing in concrete is magnetic. If the water in the concrete matrix had a little alignment from the magnetism, that would probably be good.
  2. kronosconcrete

    Structural Lightweight Concrete

    It's also easy to have the water cement ratio be wild. If one adds the right amount in the beginning, the aggregate absorbs so much that there isn't enough for the hydration. Also, one can add so much to compensate for the absorption that it's too high. I've had alot of experience mixing 80 pcf...
  3. kronosconcrete

    Exciting Idea??

    Does this make enough sense to excite? A precast lightweight concrete modular simulated cut stone continuous cavity stay in place forming system for column supported post tensioned slab construction. The form pieces are all light enough to be manually handled by an individual. After easy...
  4. kronosconcrete

    ACI 318-99

    I'm curious how many out there understand like me that post tensioning is the future of concrete. The increased spans up to slab thickness X 45 and resultant lighter weight seems to make this a no brainer. I wonder how much implementation is held back by lack of knowledge with the new Code...
  5. kronosconcrete

    ACI 318-99

    I'm curious how many out there understand like me that post tensioning is the future of concrete. The increased spans up to slab thickness X 45 and resultant lighter weight seems to make this a no brainer. I wonder how much implementation is held back by lack of knowledge with the new Code...
  6. kronosconcrete

    Two way slabs

    I agree that high degrees of refinement are unnecessary. These Code people need to create these mathematical approximations to have something to do. But, credit must be given that ever refining nuances gradually contribute to the elimination of that freak occurrence when unbelievably bad and...
  7. kronosconcrete

    Two way slabs

    Thank you Austim. The supporting beams will be taken into account by the Equivalent Frame Analysis. The moment on the column becomes less as the beams' moment of inertia and "C", torsional factor, increase. With post tensioning, there is no more column and middle strips, all is...
  8. kronosconcrete

    Two way slabs

    I greatly appreciate these replies. Doesn't it boil down to that for a good design the orthogonal directions should act in concert. That would be reinforcement or in my particular concern, post tensioning, creating an equal deflection response. The longer span feels less load, as the shorter...
  9. kronosconcrete

    Two way slabs

    I appreciate JAE's reply. It does seem ridiculous to design for full load in the longer direction when the shorter direction takes more of the load. I've read that slabs should be designed for equal deflection in each direction. That is where the deflection is the fourth power ratio of the...
  10. kronosconcrete

    ACI 318-99 two way slab design

    When designing a two way slab, does the weight get apportioned according to the ratio of the length and width of the slab? It doesn't seem the longer dimension should be designed for the same weight as the shorter dimension since obviously the shorter carries more of the load. If one uses the...
  11. kronosconcrete

    Column Rebar

    I'm designing a slab on grade (post tensioned) on fractured granite base that will support columns for a three story residence. The rebar will be the minimum 1%. Slab flatness is very important. How can I embed into the slab to come to the top of the slab so vibratory screeding isn't interfered...

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