VKelly Slipform Paving Vibration Test

The aim of the work is threefold: (1) Make the test more user friendly and portable; (2) Understand the science behind the method to guide mixture proportioning and field operations based on test results; (3) Broaden the applicability to include structural and pumping mixtures. The long-term vision of this work is to develop an understanding of how mixtures can be proportioned that are relatively insensitive to vibration abuse or are ideal for the vibration system planned for use on a given site. In addition, it is desirable that a real-time test be available on a site so that as a mixture is delivered, it can be tested for workability variances due to batching or transport, thus providing the operator with guidance on how to tune the placing equipment for a truckload for a given workability. Data can also be provided to the batch plant to guide proportions for the next truck to maintain uniformity. At present, the output from the method is a so-called VKelly Index that has been tested in the field to assess upper and lower limits for slipform paving. Initial laboratory test data using a smart vibrator that also reports the voltage required to maintain a constant vibration frequency also indicates the potential to assess a number of other mixture properties. Based on this information there is a need to fully understand the mixture and equipment factors that influence the rate at which the ball sinks under vibration and how it can be used to guide mixture proportioning and construction processes.


  • English


  • Status: Active
  • Funding: $195000.00
  • Contract Numbers:


  • Sponsor Organizations:

    California Department of Transportation

    1227 O Street
    Sacramento, CA  United States  95814

    Georgia Department of Transportation

    600 West Peachtree St
    Atlanta, GA  United States  30308

    Idaho Department of Transportation

    P.O. Box 7129
    3311 W. State Street
    Boise, ID  United States  83707-1129

    Iowa Department of Transportation

    800 Lincoln Way
    Ames, IA  United States  50010

    Kansas Department of Transportation

    Eisenhower State Office Building
    700 SW Harrison Street
    Topeka, KS  United States  66603-3754

    North Dakota Department of Transportation

    608 East Boulevard Avenue
    Bismarck, ND  United States  58505-0700

    South Dakota Department of Transportation

    700 East Broadway Avenue
    Pierre, SD  United States  57501
  • Managing Organizations:

    Iowa Department of Transportation

    800 Lincoln Way
    Ames, IA  United States  50010
  • Project Managers:

    Clute, Khyle

  • Start Date: 20230401
  • Expected Completion Date: 0
  • Actual Completion Date: 20250331

Subject/Index Terms

Filing Info

  • Accession Number: 01855026
  • Record Type: Research project
  • Source Agency: Federal Highway Administration
  • Contract Numbers: TPF-5(498)
  • Files: RIP, STATEDOT
  • Created Date: Aug 18 2022 5:02PM