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  1. DDBPE

    Gr8 bolt expoxied to CMU wall

    If the contractor did this and it was not the proper way in the first place, how sure are you the hole was the right diameter for the epoxy, the bolt is the right length, the correct type of epoxy was used (if this is a vertical face, then was a low viscosity/low sag epoxy used too prevent the...
  2. DDBPE

    Isolation Joint b't'n Asphalt and Concrete

    Typically we just tack coat for asphalt to concrete interface (curb and gutter, concrete pads, etc.). Unless for airports, they require a routed joint (after paving) with joint sealer between the two.
  3. DDBPE

    Trench Excavation Shoring.

    Agree with Dik, it would be much safer and easier to go with a trench shield/box. Typically they are 8' tall and can vary in width and length. The reason for the 8' typical height is for transporting without an over-width permit. They are easily rented for short term and come with the...
  4. DDBPE

    Work zone traffic control typical for 2wctl

    Here is the relative sheets from the Virginia Work Area Protection Manual for your situation. The entire manual can be found and downloaded for free. https://res.cloudinary.com/engineering-com/image/upload/v1484942387/tips/VA_WAPM_TTC-22.1_psjusk.pdf
  5. DDBPE

    HMA surface restoration after pavement marking removal

    When epoxy or paint markings are applied it is usually under pressure. Even after milling/grinding the original marking is still evident as the material penetrates the asphalt. Fogging is typically applied after the removal to help protect the asphalt but this only last a couple years and the...
  6. DDBPE

    Beam Jacking

    If the bridge is under traffic, wouldn't the carrier beam or beams be in the way? I have heard of using hydraulic jacks just in front of each bearing pad location underneath hooked to a manifold so when the pump is turned on and pressure is applied all the jacks move at the same rate and pick up...
  7. DDBPE

    Asphalt - Leveling Course

    Are the deviations ruts (wheel path) or more like pot-holes? When we do leveling courses for roads showing signs of rutting, we use a smaller aggregate mix (9.0 mm max. nominal aggregate). Thin lifts using larger aggregate mixes can have placement issues (segregation, aggregate fracturing...
  8. DDBPE

    Asphalt overlays adjacent to curb and gutter

    Heating the "bump" and trying to flatten out is not good practice and would do nothing but cause future problems. Once the asphalt reaches a certain point with compaction, going beyond and trying to flatten out would be detrimental to the pavement. Depending on where you are in the country and...
  9. DDBPE

    Asphalt Pavement Design

    Look into this site www.pavexpressdesign.com. This design tool will also compare flexible and rigid pavement designs.
  10. DDBPE

    Trench Drain Specification

    That works, you may want add the same for the grate, some trench drains have different grate options, unless the one you specify to match only has one type of grate. When we bid, we would look at the one specified and call our suppliers to see if they have it or can give us the "approved equal"...
  11. DDBPE

    Pavement design - good, cheap or quick: Can I have 80% of all of the above?

    A couple questions. 1. By lightly loaded, is this light vehicle use for maintenance purposes or for recreational use (pedestrians and cyclist)? 2. What type of cyclist, road or off road. Road cyclist do not like chip seals, at least initially. Typically on roads, the cars will help compact...
  12. DDBPE

    Inverted Crown in Public Street

    If you will be adding a drainage system anyway, why not construct the main travelway with normal crown and for the parking areas, use a pourous asphalt. The road would drain to it and then into the drainage system.
  13. DDBPE

    D75 - Aggregate Sampling from Roadway

    EIT, the range for the #200 is 5-11. Our average was 12.7%.
  14. DDBPE

    D75 - Aggregate Sampling from Roadway

    yes D75 was specified. The plant results indicated all within the aggregate mix design (25 tests) and on the lower end of the range on the #200. The QA test was after placement and compaction (12 test), 11 of 12 test failed #200. Also, no chance to go back and take samples. This penalty has...
  15. DDBPE

    D75 - Aggregate Sampling from Roadway

    I had previously posted in the Civil/Environmental Forum an issue in regards to P-209 gradation after compaction. At the plant the average #200 was 6.8% and the after compaction tests were 12.5% Now the supplier of the material is disputing the penalty along with us imposed by the owner (the...
  16. DDBPE

    Duty to Warn

    I would start with verbal to the owner to get someones attention right away. Followed up by a letter referencing your verbal conversation with details. The letter would be certified, but before sending, I would scan and e-mail an advanced copy. This letter and email would also be sent to the...
  17. DDBPE

    Repair asphalt with concrete patch

    Do not use concrete for an asphalt patch. As Ron stated, you will have separation at the joints, one is flexible the other is rigid Do you know the cross section? If you have a multiple lift asphalt section I would repair the areas as follows. 1) Saw cut and remove the failed asphalt (keep it...
  18. DDBPE

    Dewatering

    De-watering bags are used quite often for pumping water from sites that discharge offsite. The bags can be sized to the pump and expected volume of silt. Sometimes smaller bags are used, you just have to monitor how full they get and switch them out when they are at capacity. I have used...
  19. DDBPE

    Backfill lift thickness with jumping jack

    You'd be surprised what you can get out a jumping jack, especially in a confined area. Do your specifications call for a specific maximum lift thickness? If there is, refer to it, if not, you do not want to get into a position to be directing a contractor on how to perform the work. If he...
  20. DDBPE

    Nuts Pulling Threads off of Threaded Rods

    Here is the spec sheet for the threaded rod I listed earlier. This was and maybe still is a reputable supplier of bridge temporary support components in the US.http://files.engineering.com/getfile.aspx?folder=81e2cb2f-6b32-449a-bd8a-10c96a107abc&file=Dayton-Richmond_Spec_Sheet.pdf

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