Performance-Related Specifications for Pcc Pavements. Volume II: Appendix B-Field Demonstrations

Introduction

Three additional PRS prototype shadow field trials were conducted in conjunction with FHWA OTA personnel during the 1997 construction season.   The objectives of these additional field trials were twofold: (1) to continue the verification of the overall PRS prototype approach (including the sampling and testing methods), and (2) to familiarize OTA personnel with the general PRS concepts while allowing them to gain experience in the application of the prototype PRS approach on actual construction projects.

Three different field trials were selected for investigation by OTA personnel.  These included projects in Albuquerque, New Mexico; Poplar Bluff, Missouri; and Manhattan, Kansas.  Both the Level 1 and Level 2 PRS prototypes were demonstrated at each of the projects.  Pay factors were computed for each project based on the acceptance of four different AQC’s: concrete strength, slab thickness, air content, and initial smoothness.  AQC sampling and testing methods were based on SHA standard procedures. Appropriate PRS-related AQC sampling and testing was conducted at each project by OTA personnel (using the OTA concrete trailer).

This chapter discusses all of the pertinent details related to each project demonstration, including details of the specification development, the conducted sampling and testing, and the computation of shadow pay factors.