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  1. nbryan

    grouting vs. underpinning

    I have seen the helical piers utilized for repair of a crane rail foundation. The helical piers can be galvanized for protection against corrosion. The jacking is typically done by hand and can be incredibly precise, in fact on the above project, the contractor accidentally lifted the...
  2. nbryan

    Concrete Mix Verification

    In regards to the 'initial tests' referenced in the above standard, what batch size would be adequate? In specific, would it be appropriate to perform this type of testing in a laboratory or would it be more appropriate to perform testing from the actual batching process?
  3. nbryan

    Concrete Mix Verification

    This reference source is quite expensive. Are there any other sources for concrete mixture verifications.
  4. nbryan

    Footing Inspection

    Try this as a reference for performing dynamic cone penetrometer testing: ASTM Special Technical Publication No. 399
  5. nbryan

    Concrete Mix Verification

    What references are available for concrete mix verifications and are there any standards in place?
  6. nbryan

    Correlation between SPT, CBR and DCP

    I believe there is a draft standard in the works which correlates DCP (8 kg) w/ CBR. Contact ASTM Subcommittee D 04.39 for more information.
  7. nbryan

    foundation bearing capacity site tests

    The answer to the question is NO. Unfortunately, I've had the opportunity to visit properties where poor soil conditions were bridged with compacted fill. Unfortunately, the foundation sytem was bearing under the fill.
  8. nbryan

    Rebar Corrosion in Elevated Slab

    What would be the best testing plan to determine the extent and severity of corrosion of a reinforced elevated slab exposed to salt water byproduct of a manufacturing process? Are there any remediation procedures for steel only slightly damaged? Also, would the concrete itself be affected?
  9. nbryan

    the effects of fire on concrete

    Hey Ron, What do you think about concrete exposed to salt water, particularly where reinforcement has deteriorated? I'm refering to the lowering of the pH and strength of the concrete. I am aware that the detiorating reinforcement is a serious problem.
  10. nbryan

    Base Plate Grout

    Is there a test method or an acceptable practice for testing base plate grout in the field?
  11. nbryan

    Asphalt Paving in the Rain

    Asphalt which is applied at a lower than specified temperature will deteriorate over time. Check temperatures of mix brought to project. Note and keep record of questionable areas.
  12. nbryan

    Compaction of Open Graded Fills

    Kam, What is a max-min density test?
  13. nbryan

    Density Testing

    After much debate and review of the ASTM, I am convinced that it should be six decimal places and not four. This is very important in computer program applications. An example conversion would be as follows: 53.56 cubic inches converts to roughly 0.03099537 cubic feet. Now, to convert cubic...
  14. nbryan

    Gypcrete Testing

    How would gypcrete be tested after placement? It is believed that this product is failing in an application.
  15. nbryan

    Vibration Monitoring / sensitive equipment

    What would be the best way to monitor vibrations for equipment that is sensitive to one micron? It is planned to install a vibrating peice of equipment in a facility with very sensitive equipment.
  16. nbryan

    Density Testing

    When performing a density test in accordance with ASTM D 2937, the ASTM requires a drive cylinder volume reported to the nearest 0.01 cubic inches. What would this convert to in cubic feet? I am concerned about significant figures in relation to calculating a final unit weight.
  17. nbryan

    Rising Groundwater and Foundation Settlement

    Could rising groundwater with occasional inches of ponded water contribute to settlement of a column footing? I have encountered a footing where groundwater rises to within several feet and settlement has occured. The footing bears on stiff to very stiff clay with sand. A few inches of ponded...
  18. nbryan

    #57 Stone as Fill

    Could the use of #57 stone be placed under footings where loose soils were removed? The argument would be that fines could wash into the stone and potentially undermine the foundation?

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