A recently completed LBR project, January of 2014, at Chandler Regional Airport involved rehabilitating Runway 17-35. Runway pavement exhibited distresses due to seasonal environmental conditions and load bearing. Major longitudinal and transverse cracking and alligator cracking were evident. Repair of the pavement was necessary to extend the life of the pavement and to increase pavement strength.
There was some major cracking (up to 8” wide as shown on the picture above) that needed to be addressed before an overlay was done. LBR came up with a design to deal with the existing cracks based on size. Any damaged pavement around the large cracks (3” and greater) was sawed away to provide vertical faces for the full depth concrete that was to be installed in them. Large cracks were saw cut, cleaned, compacted, and filled with PCC pavement. For the cracks from 1” to 3”, a mastic crack seal specification was used. We have found this method to work exceptionally well for cracks of that size. The remaining ½“ to 1” cracks were sealed to finish preparation of the existing pavement for the overlay.
Low elongation paving fabric was installed on the runway after the crack preparation process was completed. The paving fabric greatly increases the life of pavement. A 3” overlay was installed next. The second picture above shows the final product. This picture was taken in the same area as the first picture. By correctly fixing the issues with the existing cracks, this overlay will produce a much greater benefit and life. The added life and strength added by this project is vital at an airport that gets daily jet traffic.
The project was funded through a coordination of the OAC and the City of Chandler. The total construction cost was just under one million dollars.
Chandler Regional Runway After Construction (Same Area as Before Picture)
Chandler Regional Runway Crack Before Construction
Post Construction Photo of Expansion Joint Installed
LBR got a call from the Oklahoma Aeronautics Commission and the City of Cushing asking for help when their runway up-heaved (blew up) in multiple places. Due to the large rainfall and heat of the summer, the runway was under a great amount of stress. It up-heaved in multiple places and threatened to in many more. LBR designed the project and distributed it to 3 excellent contractors for bids. Since it was an emergency, the normal advertising/bid process did not have to be followed. The proposal for the project had three criteria; construction cost, construction time needed, and start date. Within a week, we had a low bid and construction time selected, Contech, Inc. They started the job the next week and finished installing expansion joints in four places along the runway to alleviate the pressure (see the saw blades that got stuck due to the intense pressure). They finished in 13 working days. The project was 20% under budget and 5 days early. The runway is now back open and safe for use. The expansion joints will help this from happening ever again.
Pre-Construction Photos of Shifting Concrete Panels
Construction Photo of Saw Blades Stuck
Shawnee Regional Runway Strengthening
Boise City Municipal Runway Overlay
Stillwater Regional Runway Strengthening