Basic Concepts: Pavement Ownership Costs Money

The greatest cost in the pavement lifecycle is the initial construction cost followed by future overlay or reconstruction costs. The surface type selection will determine the number of pavement layers and their thicknesses and the ultimate costs. In general, hot mix asphalt concrete will have lower initial costs in most […]

Basic Concepts: Pavement Performance Primer

Pavements keep us out of the mud Pavements keep us out of the mud This was mentioned in our first posts. There are a multitude of options to keep us clean and dry. What is the budget? What is the surface type, how many layers, and how thick are the […]

The Pavement Maintenance & Rehabilitation Cycle

Pavement Management Report Design: plans, specifications & estimates Bidding and review Construction observation Update pavement management database and record drawings Zimmer Consultants begins a new pavement maintenance & rehabilitation cycle with a pavement and site inspection followed by the Zimmer Report. The Report discusses condition and provides 10-year budgets. Once […]

The Zimmer Report: Pavement Performance

If you remember, an effective pavement management program requires three things, the size of the pavement area, the age of the pavement, and a repeatable, objective rating methodology which identifies pavement distress type, severity level, and amount of distress. With this information, we can plot the Figure above. It shows […]

The Zimmer Report: Budget & Condition

If the Zimmer report can be summarized in one Figure, it is what we call Budget & Condition. It presents four data sets plotted by year. The yellow line with solid, black diamonds is the actual, average pavement condition, PCI over time. For this example, after the 2018 data point […]

The Zimmer Report: Budget Consequence

There is a way to confidently answer your “What if” questions.  What if we reduce the pavement rehabilitation budget? What is the effect on pavement conditions?  Conversely, how much will it cost to improve the pavement condition by 10 points? Our Budget Consequence Figure presents a powerful tool to determine […]

The Zimmer Report: Pavement Condition History

By knowing the construction date or date of last overlay, we can make a prediction of future pavement conditions. This can be done for individual management units, a property, or for a portfolio. The Figure illustrates six pavement inspection points with predicted conditions at each point. The yellow diamonds present the […]

The Zimmer Report: Condition Frequency Charts

A property’s Pavement Condition Index (PCI) numbers can be divided into seven levels ranging from Excellent to Failed, and then charted.  We call these figures condition frequency or FREQ charts. They are plotted two different ways, bars and stacked. They present the exact same data, but a user may find […]

Fun with Aerial Photographs

We research property history to determine the pavement age so, when used with the Pavement Condition Index, we can make predictions of future conditions. To do this we use aerial photographs starting with Google Earth Pro. Earth usually has photographs dating back to about 1990. Metropolitan areas may have older […]