- Topic Submission
- Discussion & Evaluation
- Development
- Project
Construction
Materials
Pavements
Co-Author
Is this related to or a continuation of a previous Iowa DOT research project?
No
Does this idea include matching funds?
No
Anticipated Benefits
Develop an understanding of how mixtures can be proportionated 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
Focus Area
Technology
It is critical to understand how the concrete mix will respond to changes in the materials or material properties. Industry and agencies can investigate the effects of mixture changes with an improved VKelly test. This workability test can begin in the mix design phase and be easily verified during construction. Good workability of the mix will lead to increased smoothness and better long-term performance.
GS
Real time knowledge of a concrete mixture's response to vibration at time of placement will enhance the Performance Engineered Mixture initiative and provide a tool that will aid contractors in their QC knowledge and response.
KL
As a manufacturer of paving equipment, we are keenly aware of the need to understand the “workability” of concrete mixes. A well-researched and accurate workability test with outputs which can be supplied to the slipform pavers will further advance paver automation and control. Understanding workability of the mix will produce better end results for concrete pavements.
GM
Concrete pavement has shown to be a good investment, not only lasting 50+ years in Iowa, but throughout the nation, DOTs are seeing this as a part of their pavement network. As DOT continue to optimize/improve their mix designs, workability of the mix is important. This research continues to help Performance Engineered Mix design to ensure the mix design has the right workability before it gets out tot he roadway ensuring best paving practices and giving the pavement the best opportunity to provide value for users for decades.
ET
The successful development of this test would be very beneficial as there are no reliable, practical, and quantifiable workability tests available. There is good experimental data supporting the concept that warrants further development and field verification.
Research Program
SPR / 776: Pooled Fund Studies - IA Lead
Project Title
VKelly Slipform Paving Vibration Test
Project Number
SPR-TPF5(498)-8H-00
Contracted Agency
Iowa State University
Project Champion
Funding Program
State Planning and Research
Project Funding
$20,000
Project Funding Including External Sources
$195,000
Partner Agencies
California DOT
Georgia DOT
Idaho DOT
Kansas DOT
North Dakota DOT
South Dakota DOT
Georgia DOT
Idaho DOT
Kansas DOT
North Dakota DOT
South Dakota DOT
Project Start Date
04/01/2023
Current Project End Date
03/31/2025
Research in Progress Brief
Project Abstract
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.
Project Champion
Project Manager
Delivering targeted solutions for Iowa's transportation future.
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