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  1. cnstengineer

    Deck Repairs in an Existing Latex Modified Concrete Overlay

    When an existing concrete t-beam bridge was widened about 25 years ago, a variable depth un-reinforced latex modified concrete overlay was placed over the existing t-beam bridge. The depth of the overlay ranges and is about 5" thick at it's greatest depth. Today there is visible spider...
  2. cnstengineer

    Profilograph testing for bituminous ride quality

    What is the average cost per day to run a profilograph measuring device? One is needed for a mill and overlay project. The profilograph testing will be needed at the end of each working shift to measure the ride quality of the paving placed on that particular day prior to opening back up to...
  3. cnstengineer

    Profilograph testing

    What is the average cost per day to run a profilograph measuring device? One is needed for a mill and overlay project. The profilograph testing will be needed at the end of each working shift to measure the ride quality of the paving placed on that particular day prior to opening back up to...
  4. cnstengineer

    Utility trench in contaminated soil

    You will need to work closely with the EPA on the site specific saftey requirements for this project. The contractor will need to develop a specific health and safety plan for the project. They will most likely have to use breathing apparatuses and monitor the quality of the air. The amount of...
  5. cnstengineer

    Superpave Wearing Course

    I’m working on a project that has a paving spec of 4” BCBC and 2” of wearing. The wearing course is specified as 12.5mm superpave. It has been requested to substitute the 12.5mm superpave with a 9.5mm superpave mix. What are the advantages/disadvantages to using a mix with a finer aggregate...
  6. cnstengineer

    Parking Lot Safety

    In Pennsylvania, government agencies have sovereign immunity where they are basically immune from tort liability. There are however exceptions to this for negligent acts, etc. and there are limitations to the amount of recoverable damages. The town will have to prove that they did not create a...
  7. cnstengineer

    Concrete Paving

    Dik is right. The timing of the sawcuts is critical so that you don't get any cracking as the concrete hardens.
  8. cnstengineer

    Volume of Dirt per Tri-Axle Truck

    I just want to get an idea of what everyone uses for a tri-axle truck volume. How many Cubic Yards of dirt do you figure per tri-xle truck load? I'm looking for an in situ volume of dirt. And by dirt I mean a well to finely graded material, not bouldery. Also, I'm located in Pennsylvania. I...
  9. cnstengineer

    Outslope Road Profile

    Option #1 looks like the better option to me. If you are looking to elimiate the curb you can possible install the sidewalk with a haunch on the road side and then pave the road. The authority may be okay with this since it is just an access road that will not get much use. If you are looking...
  10. cnstengineer

    Pipe Zone Compaction

    Check with the pipe manufacturer on their backfill requirements. They usually require a stone envelope and the contractor should have known better. I've installed many of these underground systems and one of the big dollar items is the stone backfill. My guess is that the contractor dug 3...
  11. cnstengineer

    Direct Burial of Gatve valve, is it possible at 8m deep - how?

    If you are putting the valves in manholes, I would recommend flanged pipe connections with pipe supports so that the valves could be more easily replaced in the future. If you go with direct bury, you can get away with mechanical pipe connections at the valve, valve box extensions, and valve...
  12. cnstengineer

    Contract delay

    The contractor should be entitled to fair compensation for the delay plus an extension of contract time if the delay was outside of his control. He should be paid for the ownership cost of the equipment to sit for the 7 days with a reasonable markup for overhead and profit. He should not be...
  13. cnstengineer

    Crushed stone turnaround area

    The stability of the soil below your layer of crushed stone will need to be solid. I would recommend performing a proof roll of the subgrade prior to placing the stone. Make sure any fill placed to build the turnaround is properly compacted. I would also try to keep the stone thickness pretty...
  14. cnstengineer

    Pouring Piers with Water in the Hole

    I should have mentioned that these caissons are in an area adjacent to a stream so pumping the excavation prior to pouring is not feasible, even with a casing. Thanks for the responses. Very helpful.
  15. cnstengineer

    Pouring Piers with Water in the Hole

    I'm working on a project where we are installing concrete piers that are drilled approx 24 - 25' below grade. The drilled caisson portion of the pier has a signficant amount of water in the hole. The contractor would like to pour the piers using the tremie method and pump the water from the...

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