Comparing quality on sr-5 1 design-build and ADOT design-bid-build freeway projects
Vivek Sharma, Summer 2005
Brief:
The initial objective of this research is to establish the degree of impact on project quality through the use of Design Build Delivery Methods. This is done through comparing various past projects through traditional delivery methods to those that have utilized the design build project delivery method. Previous studies have been completed analyzing Design Build (DB) projects involving schedule compression, 1-17, SR 68, and US 60. This study includes those projects plus data gathered from SR51. Initially the project was valued at $75 million which in the end increased to $90 million. The objective of this research study is to measure the level of quality and impact of schedule in five categories. The five categories are Pavement Smoothness, Material Test Data- Concrete Strength & Field Density, Workmanship Quality, and Partnering. These five categories are used to determine the overall schedule & quality impact on the project and are compared against the similar project data from past Arizona Department of Transportation (ADOT) projects. The purpose of the study is to determine if the quality of the traditional design bid build projects is indeed equal. During the analysis it was observed that the project material quality was comparable and in most cases better than Design-Bid-Build (DBB) projects yet the Workmanship Quality and Partnering suffered due to a lack of initial training in this relatively new delivery system.