ORD Research survey plan
University of Illinois at Urbana-Champaign
CEAT-OMP Research Project on Pavement Grooving and Reflective Cracking of Asphalt Overlays
June 13, 2007
Left to Right: Jeff Kern (ERI), Imad Al-Qadi (UIUC Faculty), Abbas Butt (ERI), Bill Buttlar (UIUC Faculty), Hasan Ozer (UIUC PhD Student), Hyunwook Kim (UIUC PhD Student)
Runway Layout - O'Hare International Airport (pdf)
Purpose: To conduct a pavement evaluation survey at ORD on the evening of Wednesday, July 13th, 2007, commencing at 10 PM at the Airport Maintenance Complex (AMC). The survey, which is being conducted in support of the research project listed above, is intended to provide additional information about the mechanisms of groove deterioration and reflective cracking in hot-mix asphalt overlays on ORD runways and taxiways subjected to heavy aircraft.
Measurements and Data: The following measurements and data are to be obtained:
• Cracking information: Type, extent, and severity of reflective cracking. Pictures and video of typical crack patterns. Mark locations for coring (see below).
• Groove collapse information: Laser profiles of deteriorated and intact regions of pavement. Visual surveying, pictures, and video. Mark locations for coring (see below). Try to coordinate locations with those needed for reflective crack task.
It is anticipated that the most time consuming operation will be the laser profilometry, which should take no longer than two hours in each of the two main sampling locations (see below). Jeff Kern of ERI will drive the van slowly across the pavement in both the longitudinal and transverse directions. The van will move very slowly, as we try to capture good macro and microtexture profiles of the grooves in the asphalt. We will spend time aligning the van, and taking replicated measurments. During this time, crack surveying and coring location selection and marking can take place. At any time, the van can be moved quickly off of the pavement (less than 30 seconds).
Marking locations for future coring
UIUC researchers, in conjunction with ApTech Engineering (Ben Holzhausen) will mark locations for pavement sample procurement via coring. UIUC researchers are requesting 6-inch diameter samples of asphalt concrete for laboratory evaluation of groove collapse and reflective cracking. Ideally, coring locations will involve a combination of intact (sampled away from aircraft gear loads) and damaged areas (under gear loads). The majority of cores should be obtained in areas of intact material, away from gear loads. If coring in ‘wheel path’ locations is not permissible, then all cores can be obtained in undamaged areas. Coring on two distinct pavements is desired (see schematic on following page). Based upon the results of the previous survey conducted in the Fall of 2006, the target coring areas are: 1) near the intersection of 4L-22R and 18-36 in the North airfield, and; 2) near the end of 22L. If one or both of these locations is inaccessible on June 13th, then we will find other locations, with the goal of having a ‘good performer’ and a ‘poor performer’ if possible.
At each of these two locations, nine pavement cores are desired (for a total of 18 cores). Coring is planned to be headed up by Ben, and will take place at a later date. It is anticipated that during this operation, only asphalt concrete will be sampled from the pavement, e.g., the coring operator will ‘snap’ the asphalt layers off of the PCC in the process of coring. Cores can then be extracted from the core hole with stiff wires or a suitable clamping device. This will minimize pavement disturbance and patching material quantities.
Equipment: Safety gear: glasses, hard hats, steel-toe boots, safety vest. Measuring tapes: long 100ft and 2 small ones, measuring wheel, tool box, calipers (for crack widths). Cameras: digital still and camcorders. Three orange paint cans (with attachment). ERI’s (http://www.erikuab.com/) laser profilometer (van mounted device). UIUC, along with ERI, will bring all of these items.
Contact Info:
Professor Bill Buttlar: (217) 369-8370, buttlar@uiuc.edu
Professor Imad Al-Qadi: (217) 265-0427, alqadi@uiuc.edu
Applied Pavement Technology, Inc.
Executive Towers West III
1400 Opus Place, Suite 905
Downers Grove, IL 60515
630-434-9210
630-434-9213 fax
www.pavementsolutions.com
Jeffrey S. Kern, P.E.
Senior Engineer
ERI
1401 Regency Drive East
Savoy, IL 61874
217-356-5945
217-356-6347 (fax)