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FDOT Bridge Spall Repairs


APPLICATION REPORT


Customer
: Florida Department of Transportation

Date/Time:
July 2011 9:00 PM – 1:00 AM

Project Description: When prefabricated concrete bridge structures were installed at Palm Beach International Airport, the slots used to move the structures into place needed to be filled in on the driving lanes. The conventional rapid-set concrete originally used did not bond to the cured surface and subsequently delaminated, cracked and spalled, requiring concrete repair.


 

Site Prepped
Spall upon arrival.

Permanent Repair
Phoscrete makes a permanent repair.

Placing Phoscrete
Placing Phoscrete is Fast and Easy.

Phoscrete fixed it.
Phoscrete Fixed It.

 

Weather Conditions: 50% humidity, no precipitation.
Ambient temperature: Begin at 9:20 PM: 86°F End at 12:54A M: 84°F

Product Used: Phoscrete® 601-L

4 units used to cover 5 total spall repairs
Working time: 10-15 minutes
Set time: 30 minutes each location (includes working time)

Installation Notes:
Four units of Phoscrete 601-L were ordered for this project. The five spall areas required relocation of the bridge crew four times, requiring wait time for the material to cure in-between repairs.

Controlling Setting Time:
In order to move on from one location to the next with minimal waiting tme, Stellar's engineering department recommends leaving the material in the bucket (with or without mixing) for one or two minutes maximum before pouring to allow it to setup faster (due to the larger mass of material in the bucket than spread out on the repair). Please keep in mind that the higher the ambient temperature, the faster Phoscrete sets and cures. Do not place Phoscrete in a hole once it begins to harden in the bucket!

Using Forms on Slopes:
Phoscrete is not self-leveling, but it is self-consolidating. When installed on a slope as is often the case on bridge decks, Stellar Materials recommends using plywood painted with a small amount of Phoscrete Activator. Cover the entire repair and keep in place with weight to allow the material to cast in place until it is set.

Conclusion:

Phoscrete chemically bonded to the concrete substrate, creating a permanent repair that will not crack. Installation was fast and easy, and the bridge crew knows how to properly mix and place Phoscrete for future repairs.

Site Inspection, August 9, 2011:

FDOT and Stellar inspected the repairs, and all were solid in the ground, firmly bonded to the substrate.

Second repair inspected
Second repair inspected.
Third repair inspected
Third repair inspected.

Last modified at 8/10/2011 9:05 PM  by Brian Mintz