There are many factors that affect the durability of Portland cement concrete (PCC), including the mix design and the materials used, the quality of construction, and the environment. Durability is not an intrinsic property of the concrete, but instead is related to how the material interacts with the environment. Durability-related deterioration is referred to as materials-related distress (MRD). Common MRDs include those caused by physical processes, such as freezing and thawing, or chemical processes, such as alkali-silica reactivity (ASR) and sulfate attack. This research project was undertaken to determine whether concrete used in the ADOT system is experiencing, or is potentially susceptible to, ASR or sulfate attack, and if so, to what degree.

Tourism is one of 12 industry clusters widely considered to be driving the Arizona economy according to the Governor’s Strategic Partnership for Economic Development (GSPED). The term "cluster" refers to a geographic concentration of interdependent companies, suppliers, products, labor pool, and institutions that together constitute an important competitive advantage for a region. In northern Arizona, tourism ranks as the predominant industry cluster. This paper provides a profile of the tourism cluster in Coconino County, with special focus on the Flagstaff area. It examines the cluster’s composition, relative size and importance to the regional economy. It addresses the cluster’s dynamics and requirements for growth. It reviews important national and worldwide trends affecting tourism in Arizona, as well as the special characteristics of gateway communities. And, finally, it presents a menu of actions to choose from for strengthening the cluster in both Flagstaff and Coconino County.