The Zimmer Report: Pavement Condition History

By knowing the construction date or date of last overlay, we can make a prediction of future 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. The yellow diamonds present the actual pavement condition […]

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 date, but a user may find […]

Fun with Aerial Photographs

We research property history to determine the pavement age so 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 photos, for example, Chicago has aerials dating […]

The Zimmer Report: The Small Property Version

For over three decades, we have been refining the pavement management process for pavement owners. The Zimmer Report is the product of our ongoing processes to create useful documents for our clients. The image is of our short report for small properties. These reports will answer your questions about how […]

Is It Cement or Concrete? What is the Difference?

The terms ”concrete” and “cement” often seem interchangeable and when used to identify pavement type it can be confusing. There are both asphalt cement and asphalt concrete, and Portland cement and Portland cement concrete. Cement refers to the binding material used to “glue” the rock or aggregate together. The top […]

Frost Heave: Seriously, Fix the Problem

Frost heave is cause by a deep freeze of poorly drained, fine soils. The free moisture in the soil expands when frozen. The freezing draws more moisture up and into the frozen layer to create an ice lens. Since ice expands, the sidewalk is pushed up. The photograph shows a […]

If You Have a Life Safety Issue, Do Not Advertise It, Fix It!

On a recent property inspection, I captured this sign and sidewalk. Fortunately, it’s not on our client’s property. But, seriously, the time and effort gone into having this sign fabricated and installed should have been spent on correcting the described slippery sidewalk conditions. This property owner clearly has a running […]

Products: GAP Mastic Crack Repair

A client in Minnesota has been extolling the ease of application and performance of a crack repair product. It is GAP Mastic Crack Repair from Maxwell Products, Inc., Salt Lake City, Utah. The product appears to be a blend of soft, polymer-modified asphalt cement with small aggregate mixed in.  It […]

Selecting The Right Pavement Type

Selecting a pavement surface is typically a choice between asphalt concrete or Portland cement concrete. In many parts of the country, AC is the first choice. In the South, PCC is more common. Pavement type selection has many factors: The primary factor is initial cost of installation. Local material cost […]

Pavements? What’s the Difference?

There are three pavement types: Flexible – Asphalt concrete Rigid – Portland cement concrete Interlocking pavers – Stone, brick, or blocks But there are seemingly infinite variations of each. Flexible: The black stuff is asphalt concrete (left photo), also called hot-mix asphalt concrete. In some states or regions, it is […]