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JAE and Ron. Thank you for your help on this. This will all be designed by a structural engineer with experience, I am just trying to understand the process before I speak to the engineer/contractors. The concrete is Cinder concrete and the only reinforcing is heavy wire (1/4" +/-) about 6"...

Anyone have any experience with Shotcrete concrete slab repair from below? Our concrete is cinder concrete with corroded or totally failed reinforcement in it. The bay size is approximately 6 feet by 20 feet. There is at least one diagonal brace in each bay. If the wire is corroded or totally...

Anyone have any experience with Shotcrete concrete slab repair from below? Our concrete is cinder concrete with corroded or totally failed reinforcement in it. The bay size is approximately 6 feet by 20 feet. There is at least one diagonal brace in each bay. If the wire is corroded or totally...

Ron, Thanks for the info on the grout mix. I assume that pumps and grout mix are fairly standard stuff for the industry. I will check with contractors. The J tubes is a great idea. As far as carbon fiber, I heard that was a fortune. Have you done and shotcrete repairs from below? Thanks again

We are in a 1920's NYC building where our floor is intact but the ceiling below is starting to spall off the wire reinforcement and there is some partial corrosion to full failure of the wire. There is no rebar, the structural slab concrete is cinder concrete (I am told approx. 700 psi) and is...

ajh1 - I went to the AISC website - Design Guide 15 should do the trick, (but it will either set me back $60 for the publication or $135 to join). Thanks a lot for your quick an helpful response!

Unclesyd - I saw this thread before. Thanks for the response.

I need to find specifications (hopefully free on-line download) for old steel beams, girders, and columns- for example a 20B59. I have structural drawings from a 1920's building in Brooklyn, NYC but no details. [The building is the St. George Hotel- which some of you may have visited years ago...

I need help locating (hopefully free download on-line) specifications for old steel beams, columns and girders- such as a 20B59. I have structural drawings but no details for a 1920's building in Brooklyn, NYC. [It is the St. George Hotel (some of you probably went to a wedding or other event...

I need to get (hopefully online) specifications for old steel beams from the 1920's. For instance spec's on a 20B59. I have structural drawings but I don't know what the beam spec's are. Thanks