The Long Term Pavement Performance (LTPP) SPS-2 study, or Strategic Study of Structural Factors for Rigid Pavements, represents the most comprehensive set of concrete pavement performance data in the United States.  To read more about this important study, please click here

In 2018, a series of six events were held to provide an overview of the SPS-2 Study and to evaluate SPS projects throughout the United States. Following is a list of the 2018 SPS-2 Tech Day events.  

  • Bismark and Fargo, ND – October 16-17th
  • Abilene, KS – October 2nd-3rd 
  • Pleasant Hill, IA – May 30th
  • Ritzville, WA- May 2nd 
  • Denver, CO- March 23rd
  • Phoenix, AZ- Feb. 21st

Tech Day Background
In 2018, a total of six SPS-2 Preservation Tech Day Events were scheduled throughout the country, as noted above.  At each of these events, a workshop is held to discuss the SPS-2 test sections and their performance to date; an update on current concrete preservation strategies; and a discussion of the national pooled fund experiment to piggy back onto the existing SPS-2 experiment. 

After each workshop, participants reviewed the 18 to 26 year-old test sections in the field.  The original SPS-2 experiment was established to evaluate five design features: (1) Thickness: 8” & 11”, (2) Flexural Strength: 550 psi & 900 psi, (3) Travel Lane Width: 12’ & 14’, (4) Base Type: Aggregate Base, Lean Concrete Base, & Permeable Asphalt Treated Base, (4) Drainage: drained and undrained.

Take a Virtual Tour of the Kansas SPS-2 Section!





Click here to take a virtual tour of the Kansas SPS-2 Section, courtesy of the Kansas DOT.   In Google Chrome, the viewer opens at the Dickinson/Geary County Line just east of the project.

Controls on the lower right will allow movement along the road (on the left and frame-by-frame views of the road) on the right. Controls allow navigation forward, backward, and a number of route adjustments (by mileage, year, or frame).  The robust controller allows the user to navigate along the SPS section, as well as to email, map, or print what’s in view.  We encourage you to explore the different options available in this exceptional resource, which allows a very thorough examination of this long-life pavement!

Download Presentations from the 2018 SPS Tech Day Events
Be sure to view or download the informative presentations from these events, as listed below:

  • Phoenix, AZ
  • Denver, CO
  • Ritzville, WA
  • Pleasant Hill, IA
  • Abilene, KS
  • Bismark & Fargo, ND

SPS-2 Field Layouts

Additional Reports & Resources
Comparison of PavementME and Actual Performance (12-6-17)
Pooled Fund Phase I Report Final (02-08-17)

Visit our 2019 Resource Page
Click here to see the 2019 SPS-2 resource page, which features presentations and other information.