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  • Users: mikeh
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  1. mikeh

    outdoor equipment pad

    Assuming that there will be no building above this pad (and as such no heating of the pad during winter) there is no reason to thicken (or turn down) the pad. The thought here is to allow the ground around and below the pad to freeze more or less equally. Problems can occur whenever limited...
  2. mikeh

    Can consistent quality from mobile batch plants be achieved?

    Thank you for reply (if somewhat belatedly) The info you provided will be helpful should this situation arise again. Just so you know, we ended up setting up a traditional batch plant.
  3. mikeh

    Deflecting Falling Ice

    Due to a broken steam line, ice forms at the top of a stack. It would cost million $ to shut plant down to repair. It may cost >$50,000 if large pieces of ice land on underlying equipment. Assuming that the ice weighs about 500kg and fall for a height of 100.0m, what is the resulting force on...
  4. mikeh

    80 Ft High Sign Board Pole , Foundation design help required.

    The design of the foundation for signs can be unexpectedly complex. Check out the Florida Department of Transportation website. They have an abundance of information that can guide you in your design. (Unfortunately I do not have the link)
  5. mikeh

    Would this be useful for engineers?

    Looks intriguing. If it is more intuitive than mathcad and others, could be useful. It would be nice to know which WP's this is based on. A screen shot (or animation) might also be useful.
  6. mikeh

    Load rating of existing bridges

    If the concrete girders were pre-cast, there will be a manufacturers stamp on each girder along with the year of manufacture. With luck, the manufacturer is still around. If not, it may be possible to compare the section properties with those sections manufactured around that date. Most...
  7. mikeh

    Pile in Limestone

    I do not know if it is common practice or not but.. In order to achieve some sort of end-bearing resistance for piles you must have a clean base consisting of undisturbed soil/rock which would be extremely difficult to achieve and confirm with mini-piles. You may wish to explore pressure...
  8. mikeh

    Concrete Hardstanding Design for Heavy Loads

    If you are considering a slab for a maintenance area, design life, number of vehicles etc. is difficult to estimate. Given the large wheel loads, empirical methods are probably of little help to your problem. I have found that modelling the slab as a beam on an elastic foundation will provide...
  9. mikeh

    The effects of Lithium on hardened concrete

    I am actually refferring to lithium bromide used in heating and cooling units. Would lithium bromide initiate corrosion in the reinforcement and/or encourage corrosion to such a degree that the spill alone could be blamed for spalling of the concrete due to corrosion of the reinforcement?
  10. mikeh

    Slenderness Ratio

    If a structural member has a design compressive load less than the buckling load, why does it still require that kL/r is less than 200 according to CSA S16.1?
  11. mikeh

    The effects of Lithium on hardened concrete

    What are the possible worst case effects of a lithium salt solution being spilled on a strucutral concrete floor slab.<br>Assuming that the spilled had been cleaned up within 30 days? Assuming that no clean-up had occurred?
  12. mikeh

    Can consistent quality from mobile batch plants be achieved?

    We are currently looking at doing a substaintial amount (8000m^3)of concrete work in an underdeveloped country. As such we must bring with us everything that we we need to produce, transport and place concrete.<br><br>We are currently exploring two options.<br><br>1) Set up a traditional batch...
  13. mikeh

    How do treads distribute wheels loads

    We are looking at placing some equipment below grade that needs to remain accessible in an area used for military manuevers. In order to do this, we plan to place a removable structure (similar to grating) above a shored excavation. This structure (about 3m by 5m in plan) may be run over by...

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