Tag Archives: FHWA

Publication Explains Concrete Test Method

The FHWA Mobile Concrete Technology Center (MCTC) is offering a one-page tech transfer document that provides some observations on a simple, inexpensive field testing concrete & cementitious material hydration. Hydration, of course, creates exothermic chemical reactions, which can be monitored by measuring the total heat generated over time.

“Monitoring Concrete Consistency using Semi-Adiabatic Calorimetry” descibes a test method that can monitor batch-to-batch consistency of concrete mixtures.  The test works by casting a standard concrete cylinder, then placing it in the calorimenter, recording the time-temperature curve (or heat signature), then comparing the curves of other samples from the same mixture.    

Calorimeters are described as effective tools during mix design to determine potential material incompatibility or optimal dosages/sequence of addition of admixtures. They can be used to determine setting times and saw cut times in lieu of physical testing.  Semi-adiabatic calorimeters can also be used as a quality control tool to monitor variations in the sources, quantities, and chemistry of portland cement, supplementary cementitious materials, and chemical admixtures during concrete production.  Click here to download a copy of the document.

ACPA Participates in FHWA Long-Term R&D Discussions

ACPA participated in an Expert Task Group for the FHWA Long-Term Infrastructure R&D program.  Leif Wathne participated in the long-term pavement performance (LTPP) group. A second group focuses on long-term bridge performance (LTBP). 

Leif Wathne participated in the meeting, which covered a range of topics related to long-term pavement research. Among the key questions the pavement performance group

  • How has LTPP data fundamentally improved understanding of pavement performance?
  • What are the critical, high-priority knowledge gaps?
  • What are the top 3 analysis projects to submit to NCHRP?
  • What is the ETG’s top priority to be funded by LTPP?

The meeting was held last week at the National Academies of Sciences in Washington, DC. 

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Follow this link to see ACPA’s government affairs repository. 

Tech Brief Covers CRC Design Optimization

The FHWA released an 8-page tech brief covering design optimization for continuously reinforced concrete pavements (CRCP). 

Authored by Dr. Shiraz Tayabji, Advanced Concrete Pavement Consultancy LLC, and Mike Plei, a Pavement Engineering Consultant, the publication begins with an overview of CRCP technology, including benefits including the potential to provide “zero maintenance” with proper design and construction. 

The publication, “Optimized Design Details for Continuously Reinforced Concrete Pavements” (FHWA-HIF-19-066), then provides guidance on optimizing several key design features including:

  • Simplified details for terminal ends,
  • Improved transverse construction joint detail,
  • Shoulder type, and
  • Concrete slab/base interface.

The publication is based on information included in the previously cited references and recent refinements implemented in the field.  Click here to download a copy. 

FHWA Meeting Sets Pace for Future Strategies

With encouragement to “be bold” FHWA Pavement Design and Performance Team Leader LaToya Johnson set a positive and productive course for a 1-1/2 day “Concrete Pavement Strategic Planning Meeting” last week. Held  at ACPA headquarters in Rosemont, IL.

Meeting participants included officials from the FHWA, state DOT’s, academia, and industry (including Jerry Voigt of ACPA).

The first day of the meeting  was about equally divided between  discussions about current concerns and limitations of concrete pavement design and ways to evaluate long-life pavement strategies in spite of constraints and limitations.  The second day included breakout sessions and group reports on the benefits of and implementation of long-life pavement strategies.

Framing the discussions and break-out sessions were presentations on pavement design by Mark Snyder, President of Pavement Engineering and Research Consultants; Tom Yu,  FHWA Pavement Design Program Manager; Tom Van Dam, Principal Engineer, NCE.  Kurt Smith, Program Director, and Prashant Ram, Pavement Engineer, both with Applied Pavement Technology, facilitated the meeting.  

A key deliverable of the meeting will be a white paper that will capture key points from the stakeholders and which will be used for future planning. 

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Follow this link to see ACPA’s government affairs repository.

FHWA Offers Pavement Restoration Checklists

In the resource spotlight this week is the National Concrete Pavement Technology Center’s (CP Tech Center’s) series of updated and new pavement preservation  checklist.

Originally developed by the Federal Highway Administration (FHWA) in 2002, the preservation checklists provide excellent information on innovative pavement preservation techniques. Designed to guide state and local highway preservation/maintenance and inspection staff, the checklists provide useful information to contractors and others with an interest in concrete pavement preservation, repair, and restoration. 

Checklist topics include the following: 

• Joint and Crack Sealing • Full-Depth Repair
• Diamond Grinding • Cross-Stitching
• Dowel-Bar Retrofit • Longitudinal Diamond Grooving
• Partial-Depth Repair  

 

The complete list of 2019 and 2002 checklists may be found on FHWA’s pavement preservation resource website. The CP Tech Center also includes a link to the resources on its curated online library of pavement preservation resources. 

 

Events Calendar

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Tue 22

ACPA 2019 Airport Pavements Workshop

October 22 - October 24
Fri 25

Past Chairmen’s Call (2019)

October 25 @ 10:00 am - 11:00 am
Tue 29

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