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Recent content by connect2

  1. connect2

    Railway Bridge TPG Flanges

    So this particular railway bridge was built in 1928. The girder flanges are a pair of 6" x 8" x 3/4" (LLH) then with 3 - 5/8" x 18" cover plates. The top two plates are curtailed E.S. of the center line at the 15' and 20' marks. The bridge span is 56' -3". It' a ballasted, riveted TPG with...
  2. connect2

    Crevice Corrosion aka Pack Rust

    No simple solution but yes as HR10 mentions Ultrasonic Measurement is likely the only Non-Destructive Testing possibility that could give an indication of the depth, shape, direction of the crevice pit. Taking it apart to have a look is most reliable, say all, but hadn't planned to start the...
  3. connect2

    Crevice Corrosion aka Pack Rust

    Thanks above, some comments. Cost of removal removal of a cover/flange plate would be very high and not that simple for sure. So Lamellar/Exfoliation corrosion is one thing the crevice/pack rust another. The crevice corrosion is occurring between the 3 plates that make up the bottom flange(s) of...
  4. connect2

    Crevice Corrosion aka Pack Rust

    Looking at a RR Bridge from 1929 riveted through plate girder with ballasted concrete/steel diaphragm deck. There's 'pack rust' between the bottom flange plates and in some locations the rust is up to 3/8" thick with the pack rust evident pretty well the full length. Does anybody know if there...
  5. connect2

    Maximum Mortar Bed Thikness for Concrete Block

    k thanks for the replies. While it does seem miniscule, +/- 3mm from a base line mortar depth of 10mm with the variation being checked within any 3m distance it would appear that none the less this what you find in ACI 530 and CSA S304.1. It seems that as you follow the trail and papers that...
  6. connect2

    Maximum Mortar Bed Thikness for Concrete Block

    So interested here to know what maximum bed joint thickness would be permitted before compressive strength of the mortar might be affected. TMS 602-13/ACI 530.1-13 3.3.B Placing mortar and units indicates that a 3/8" (9.5mm)thick bed is anticipated/typical. 3.3.F Site tolerances indicates that...
  7. connect2

    Raft foundation book

    'Beams Plates and Shells on Elastic Foundations'. Vlasov and Leont'ev 'Stresses and Displacements for Shallow Foundations'. D. Milovic and the always ... 'Elastic Solutions for Soil and Rock Mechanics' Poulus and Davies plus to get faster to the point...NEHRP Technical Brief No. 7, 'Seismic...
  8. connect2

    CMU load bearing walls not part of the SFRS

    In this case the CMU shear wall, in question above, will be brought down as part of the SFRS to a concrete MF/transfer beam btwn the grnd flr and 2nd flr. There is no way or desire actually to separate. Was just wondering if there was some/something 'new' re removal of stiff elements from the...
  9. connect2

    CMU load bearing walls not part of the SFRS

    Hi, Have a typical 6 story reinforced concrete block building. Numbers of shear walls spanning across the building width and stair wells at ends and elevator shaft in the middle. I have one line of shear walls that I would like to remove from the SFRS as it stops at the second floor for a...
  10. connect2

    very low SPT

    Watch for grade raises around the homes and the site in general.
  11. connect2

    Overlapping Codes and Material Standards

    In Ontario Canada we currently have; 1. A National Building Code, NBC, current date 2015. 2. An Ontario Provincial Building Code, OBC, current date 2012 and having jurisdiction. 3. A national materials standard for the Design of Plain and Reinforced Masonry CSA S304.1-2004 (R2009 and 2014)...
  12. connect2

    Disputed Repairs

    'The safety of the Public is paramount'. For an interesting take on this do a search on 'Elliot Lake Ontario, Mall Collapse'. The interplay between Owner(s), Municipality, various Consuting Engineers, Contractors etc., over time, is fascinating. Tragically and sadly I think two people were...
  13. connect2

    Disputed Repairs

    I would say the Municipality, the Chief Building Official. They are the only ones with the power to enforce the building code act on their property owners. The Chief Building Official must make the decision about the two differing opinions. You can only give your considered opinion and on the...
  14. connect2

    Cement Heat of Hydration

    Thanks hokie66 for the reply. Yes as with concrete likely a combination of things. Ready mix suppliers are so tight lipped now a days. Getting any information off them is impossible. Isn't a consolidation issue though but yes have seen that problem. I didn't ask for chilled water or ice in...
  15. connect2

    Cement Heat of Hydration

    So doing a small, lower end, mass concrete pour, the section is a 1.4m x 1.4m x 50m beam with a standard C1 concrete 35Mpa, 280 kg/m3 type 10 cement with 120 kg/m3 slag. Sealed the exposed top, left the forms on and covered the whole thing with insulated tarps for 3 days. Through the weekend...
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