Zimmer Consultants Ltd.

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Zimmer Consultants Ltd. Zimmer Consultants specializes in all aspects of pavement consulting, including design, management, maintenance, and rehabilitation.

We provide comprehensive civil/pavement engineering services for property owners and managers.

The importance of owning your stencils.
18/03/2022

The importance of owning your stencils.

A recent pavement preservation project initially looked great, but as the sealant wore off the aggregate, the original pavement markings showed up. You can see the striping contractor did not follow the specification to match the existing markings. The original low emissions image is about a foot la...

In our final Zimmer Report post, Tom covers pavement performance reporting.
16/03/2022

In our final Zimmer Report post, Tom covers pavement performance reporting.

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....

It's vital to have safe & effective curb ramps for pedestrians. Learn about two common curb ramp problems and their solu...
14/03/2022

It's vital to have safe & effective curb ramps for pedestrians. Learn about two common curb ramp problems and their solution.

These photographs illustrate two common problems found on curb ramps. First, the side flares are not at a 1:10 slope. We find that it is common to see cement finishers put in ramp side slopes in a manner similar to driveway curb returns. Side slopes for curb ramps where a […]

Learn what causes this common parking lot depression and how to fix it.
10/03/2022

Learn what causes this common parking lot depression and how to fix it.

A typical combination of thin pavement structure (combined asphalt concrete and aggregate base layers) on top of a water-saturated (often found near landscaped islands), weak, fine-grained soil (silt or clay) allows, over a long-term, the vehicle weight to push down on the pavement structure. The ac...

This week in the Zimmer Report series, we're covering the correlation between pavement age/depreciation and cost.
09/03/2022

This week in the Zimmer Report series, we're covering the correlation between pavement age/depreciation and cost.

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 […]

We never recommend short cuts especially when it comes to safety!
07/03/2022

We never recommend short cuts especially when it comes to safety!

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 prope...

Read about how we provide consistent maintenance.
07/03/2022

Read about how we provide consistent maintenance.

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 Zim...

A review of GAP Mastic Crack Repair.
04/03/2022

A review of 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 [....

Learn the process of asphalt paving with this quick read.
03/03/2022

Learn the process of asphalt paving with this quick read.

Hot mix asphalt concrete (abbreviated as HMA or HMAC) is a thermoplastic mixture of asphalt cement, rock and sand. In some states the mixture is called bituminous concrete. The earliest asphalt roads were called Macadam, after a Scottish engineer, John McAdam. He created a road building method in th...

Budget is always at the forefront of property managers minds - and rightfully so! Our budget consequence figure is a pow...
02/03/2022

Budget is always at the forefront of property managers minds - and rightfully so! Our budget consequence figure is a powerful tool when determining M & R budget levels. Read about it in the link below.

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 ...

Do you know what pavement is right for your project? Find out what your should factor in when planning.
01/03/2022

Do you know what pavement is right for your project? Find out what your should factor in when planning.

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 materia...

Explore the different pavement types & their benefits.
28/02/2022

Explore the different pavement types & their benefits.

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 s...

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