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  1. TigerGuy

    Hydrometer Problem combining ASTM D6913 and D7928

    How much organic material is floating in your sedimentation cylinder during the test? Can you burn off the organics and perform the test on the resulting "duplicate" sample? Then, compare the gradation curves and see what it tells you.
  2. TigerGuy

    Soil Boring Logs

    Have you inquired of the geotechnical engineer? There are many firms that use their own system of abbreviations. It's worth a phone call. The guide may be included in the report, and you just haven't located it.
  3. TigerGuy

    free online LIDAR sources???

    There are limited LIDAR sites available in some areas. We use one to help determine whether a mapped earthquake fault is in the vicinity of a project site.
  4. TigerGuy

    free online LIDAR sources???

    Some county offices have rough contours available on their GIS maps. My experience is that these are slightly better than using the USGS Topographic maps. Most of the civils I work for just trace the county contours onto the plan to start, until the survey crews can get to the site.
  5. TigerGuy

    Grading Practice Advice/Input

    On site cut and fill is always less expensive than importing or exporting material, unless you are fighting bedrock.
  6. TigerGuy

    Foundation Design/Idea

    You will need to get a geotech involved. A structure that takes impacts on that order is going to have significant foundation reactions.
  7. TigerGuy

    Need Advice for Commercial Site with Semi Trucks

    USDA and the Army have manuals on gravel surfaces. You should be able to locate them with a simple google search. They provide good guidance.
  8. TigerGuy

    What do all the useless engineering graduates do for work?

    A graduating engineer with zero experience is going to start at the bottom and work their way through the foundational portions of the industry. Some of these tasks can seem mundane, unpleasant, and just plain miserable. Without some of these experiences, you won't turn into a good engineer...
  9. TigerGuy

    Micropile Grout Compressive Strength

    Tell us more about these micropiles. Does their load carrying ability come exclusively from the soil to grout interaction? Are they end bearing into a stronger layer of soil/bedrock? Are the loads all compressive, or are there some tensile loads? What about steel within the element (size...
  10. TigerGuy

    Consultation on compaction.

    Sounds like you have a free-draining sand that will be placed similar to a "rock" fill. 5 cycles of vibratory compaction should give sufficient stability of the material. Will there be a pavement on top of this sand? How is it supposed to remain dry after placement?
  11. TigerGuy

    Can we PLEASE go back to the old forum!

    I think the point has been missed. Nobody seems to like the update. This site used to be a great forum to discuss various topics and help one another find solutions. Now, we can't find anything that we are used to viewing. "I have an idea. Let's take something that is really popular and make...
  12. TigerGuy

    Polystyrene Aggregate as Drain Rock Substitute

    How would you counteract the buoyant forces? I think we need more information.
  13. TigerGuy

    Repair for Segmental Retaining Wall Undermined at Base Course

    If you construct a big block of concrete as shown in the above diagrams, where do you drain the water to from behind the wall? The wall should have been constructed to a couple feet below finished grade. You may need to do some localized grading to bury the first couple rows of block, again...
  14. TigerGuy

    Retaining Wall Drain Rock Backfill

    The suppliers I have dealt with in the past try to make the fewest products that meet the widest range of standards. Example: they produce a #67 stone that can be used in concrete, or as drain rock.
  15. TigerGuy

    back pressure valve for sewer forced main.

    Once everything has passed through the grinder pump, do you really have solid particles? The last one I designed was treated as regular water for all the calculations.
  16. TigerGuy

    Do You Care About Delivering Quality?

    In any discipline, there are those clients that will always claim, "But company X says they can do this project for less." Even in public works projects, you will encounter project managers that try to bid the design services, despite the requirement of following QBS guidelines. When working...
  17. TigerGuy

    Fine Aggregate Clay Lumps & Friable Particles

    Most of the samples I ever tested were a processed concrete sand. The particles are quite rounded in shape and very durable. The test is tedious at best. I just sit down and start picking up individual particles from the pan, rolling them, and placing them in the second container. I set up to be...
  18. TigerGuy

    Fine Aggregate Clay Lumps & Friable Particles

    If memory serves me correctly, your sample size should be small enough that it doesn't take long. C142 includes a table specifying the size of sample to be tested for fine aggregate. I think it's about 25 grams, could be more.
  19. TigerGuy

    Culvert footing design

    This document may help. https://files.engineering.com/getfile.aspx?folder=56afaeac-2778-4b1a-ae19-1e3122f08dd5&file=plate-tech-bulletin-3.pdf
  20. TigerGuy

    Culvert footing design

    Is this an arch culvert, box culvert, or buried pipe?

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