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Friday, July 17, 2015

Alligators in your Pavement

UAS Construction Update for 07/27/2015

Alligators in your Pavement

Those of us with lots of experience will remember the Enco gasoline advertising campaign of “Put a Tiger in Your Tank”.  

 tiger in your tank 

 

Well we have Alligators in our Pavement….. 

 

Aligator Cracking Egan
Aligator Cracking Egan
 

Alligator Cracking in Pavement by Egan

I received a great question last week about why are we replacing perfectly good asphalt pavement. 

There are many things in life that are hard to tell when it will fail or break.  Some good examples include; the transmission in your car, the roof over your house, a freezer full of fish or your favorite high school sweater.  These things always seem to break down at the worst possible time and cost much more than expected.  However, a good steward will ask an expert how much longer the item will last and what it will cost to repair or replace.   By the way, my mechanic says my car transmission has less than a year left and my wife has thrown out my high school sweater.

  

Paving at Egan
Paving at Egan
 

UAS hired an Engineering Consultant to inventory and analyze all of the Asphalt Pavement here on the Juneau Campus.  The Engineer categorized the asphalt pavement by how long it was expected to last;  Less than three years,   three to Ten years, and more than Ten years remaining useful life.   UAS then followed the expert’s recommendations in planning for and carrying out the current asphalt pavement replacement project.

Engineers use the type and severity of cracking in the asphalt as one variable to determine it's remaining useful life.  The asphalt in front of Eagan and up at Housing was experiencing Alligator Cracking.  This cracking was caused by a sandy sub-base with weak shear strength, thin layer of asphalt and an asphalt mix that was dry and brittle. 

The asphalt repair by the UAS Recreation center was to fix some Joint Cracking/Raveling.  This is where the joint between two sections of pavement did not adhere together very well and the asphalt had begun to break apart at the joint.

 

New Asphalt Pavement at Egan
New Asphalt Pavement at Egan
 

New Asphalt Pavement at Egan

Asphalt Pavement Engineers use several other classifications of pavement failure including;  Longitudinal Cracking, Transvers Cracking, Block Cracking, Edge Cracking, Reflection Cracking, Slippage Cracking, Shoving, rutting, raveling and wearing.  Sort of makes you want to sign up for an Engineering Class :)

UAS Facilities is tasked with being a good steward for the entire infrastructure here on campus. This includes knowing when something is reaching its expected life and preparing for it to be repaired or replaced,  before it fails.  When something fails, it costs more to repair and can interfere with our mission to Learn, Engage, Exchange.

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