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  1. ChooChooBridgeEngineer

    gap filler material

    Without knowing too much more about the situation, I'd recommend a hydrophilic water stop as bridgebuster recommended. You could also consider butyl rubber sealant. Note that if you are using a hydrophilic water stop, there needs to be water somewhat consistently present to keep the water stop...
  2. ChooChooBridgeEngineer

    Concrete without Aggregate

    To circle back around on this, MotorCity, that's close to what I did. They then said whoops, not what we meant to send for the concrete mix design.
  3. ChooChooBridgeEngineer

    Continuation deformed reinforcing bars across sawcut contraction joints

    Concrete is a notably non-homogenous material. In a perfect world, you would be theoretically correct, but in reality, you have to do more to make sure that the concrete cracks through the saw cut joint.
  4. ChooChooBridgeEngineer

    Continuation deformed reinforcing bars across sawcut contraction joints

    I've typically seen this detail where the reinforcing amount is reduced by half at those locations. Whether that methodology is effective, I leave it up to others to debate that, right or wrong.
  5. ChooChooBridgeEngineer

    Bonding Strength of Concrete in Tension

    Like others have indicated above, I'd avoid this method as well. Depending on what you are picking the slab with, there would likely be a 'pop' or release of energy. That would shock load the rigging you have and whatever you are picking it up with (crane, excavator, etc.). Likely some...
  6. ChooChooBridgeEngineer

    Concrete without Aggregate

    Thanks for the replies. I asked the contractor what aggregate he is planning on using and he said none. That's when I decided to come here and confirm. Reduced shear capacity and brittleness is more than enough justification. Thanks for the replies all!
  7. ChooChooBridgeEngineer

    Concrete without Aggregate

    Okay, here's a new one for me. A contractor has submitted a mix design for the proposed "concrete" on one of my projects. Their mix design consists of water, cement, and superplasticizer... No aggregates at all. This is being used to retrofit an existing railroad bridge, so they are...
  8. ChooChooBridgeEngineer

    Falsework Adjacent to Traffic Additional Wind Load

    Yeah, I have seen one research paper vaguely state that the additional 5psf was because of importance, but it didn't expand on it in the slightest.
  9. ChooChooBridgeEngineer

    Falsework Adjacent to Traffic Additional Wind Load

    That was my thought too. I was mostly curious about the history of it. I've never seen any commentary on it, and was curious of when and why it was included in the provisions.
  10. ChooChooBridgeEngineer

    Falsework Adjacent to Traffic Additional Wind Load

    In AASHTO's Guide Specification to Bridge Temporary Works, there is a requirement for the basic wind pressure to be increased by 5 psf for falsework members over or adjacent to traffic openings. (Section 2.3.5.2 in the 2nd edition if anyone is interested) Does anyone know where this provision...

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