Construction Cycle 2 CC-2 Phase II Single Slab 


Construction cycle one CC-1 included three Portland cement concrete PCC test pavement placed on stabilized base, one above low strength subgrade, one above medium strength subgrade, and one above high strength subgrade. During trafficking the rigid pavements experienced premature top-down corner cracking due to upward curling at the slab corners. It was necessary to further investigate the curling phenomenon to avoid premature corner cracking in future rigid pavement research at NAPTF.



The objectives of this CC2 research phase were to:



  • Construct an indoor single concrete slab within NAPTF;
  • Characterize curling phenomenon within indoor environment using instrumentation and NDT;
  • Determine the adequacy of the instrumentation system and monitoring system; and
  • Gain experience in placing instrumentation in PCC slabs.


The outcomes from CC2 Phase II led to two modifications to the FAA airport pavement design procedures: i PCC pavement boundary conditions should be modified in order to calculate the critical bottom-up edge stress and ii the critical interior stress at the bottom of a slab does not need to be calculated in the procedure for pavement thickness design. The complete testing report including test results and findings can be found here.



              Construction                                                                       Traffic Testing

Test Section Layout

NDT Procedure & Data

Instrumentation Plan

Test Results & Analysis






Construction Cycle Data

This construction cycle has the following sub-pages:


1. Test Objective

8. Painting Plan 

2. Test Plan

9. Profiler Data/Rut Depths HMA 

2a. Gear Configuration

10. Pavement Distress map Concrete

2b. Wheel Load/Tire Pressure

11. Post Traffic Testing

2c. Wander Pattern

11a. Trenching

3. Pavement-Construction/Cross-Section

11b. CBR

4.Instrumentation Plan

11c. HWD

5. NDT Plan and Data

11d. Plate Loads

6. Material Characterization Plan & Data 

12. Search the CC-2 Single Slab Database

7. Material Testing Reports 



Click here to search CC2 Phase II Single Slab Database



  1. Curling Under Different Environmental Variations as Monitored in a Single Slab Concrete, APT 2008.





Back to CC2 Main Page