Detection of Concrete Delamination by Infrared Thermography, HR-244, 1986

Iowa has approximately 1000 bridges that have been overlaid with a nominal 2" of portland cement concrete. A Delamtect survey of a sampling of the older overlaid bridges indicated delaminations in several of them. Eventually these bridges as well as those that have not received an overlay must be programmed for rehabilitation. Prior to rehabilitation the areas which are delaminated must be identified. There are currently two standard methods of determining delaminated areas in bridge decks; sounding with a metal object or a chain drag and sounding with an electro-mechanical sounding system (Delamtect). Sounding with a metal object or chain drag is time consuming and the accuracy is dependent on the ear of the operator and may be affected by traffic noise. The Delamtect requires less field time but the graphical traces require that data reduction be done in the office. A recently developed method of detecting delamination is infrared thermography. This method is based on the temperature difference between sound and delaminated concrete. A contract was negotiated with Donohue and Associates, Inc. of Sheboygan, Wisconsin, to survey 18 p.c. concrete overlaid bridge decks in Iowa using the infrared thermography method of detecting delaminations.

Iowa Community Private Well Study, 2004

Water fact sheet for Iowa Department of Natural Resources and the Geological Bureau.

Reaudit letter to the City of Ottumwa for the period July 1, 2005 through June 30, 2006, as well as certain issues applicable to the year ended June 30, 2005 and subsequent periods

Reaudit letter to the City of Ottumwa for the period July 1, 2005 through June 30, 2006, as well as certain issues applicable to the year ended June 30, 2005 and subsequent periods

Evaluation of Bond Retainage in Portland Cement Concrete Overlays Using Infrared Thermography and Ground Penetrating Radar, HR-537, Final Report, 1989

When concrete deterioration begins to occur in highway pavement, repairs become necessary to assure the rider safety, extend its useful life and restore its riding qualities. One rehabilitation technique used to restore the pavement to acceptable highway standards is to apply a thin portland cement concrete (PCC) overlay to the existing pavement. First, any necessary repairs are made to the existing pavement, the surface is then prepared, and the PCC overlay is applied. Brice Petrides-Donohue, Inc. (Donohue) was retained by the Iowa Department of Transportation (IDOT) to evaluate the present condition with respect to debonding of the PCC overlay at fifteen sites on Interstate 80 and State Highway 141 throughout the State of Iowa. This was accomplished by conducting an infrared thermographic and ground penetrating radar survey of these sites which were selected by the Iowa Department of Transportation. The fifteen selected sites were all two lanes wide and one-tenth of a mile long, for a total of three lane miles or 190,080 square feet. The selected sites are as follows: On Interstate 80 Eastbound, from milepost 35.25 to 35.35, milepost 36.00 to 36.10, milepost 37.00 to 37.10, milepost 38.00 to 38.10 and milepost 39.00 to 39.10, on State Highway 141 from milepost 134.00 to 134.10, milepost 134.90 to milepost 135.00, milepost 135.90 to 136.00, milepost 137.00 to 137.10 and milepost 138.00 to 138.10, and on Interstate 80 Westbound from milepost 184.00 to 184.10, milepost 185.00 to 185.10, milepost 186.00 to 186.10, milepost 187.00 to 187.10, and from milepost 188.00 to 188.10.

Farm Families Alive and Well, January 2014, Vol. 20, no. 1

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, March 2007, Vol. 13, no. 2

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, Vol. 9, issue 2, 2003

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, Vol. 13, issue 1, December 2006

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, December 2007, Vol. 14, no. 1

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, December 2009, Vol. 16, no. 1

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, December 2011, Vol. 18, no. 1

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, December 2012, Vol. 19, no. 1

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, Vol. 11, issue 2, 2005

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, January 2011, Vol. 17, no. 1

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)

Farm Families Alive and Well, Vol. 13, no. 3, 2007

News from Iowa’s Center for Agricultural Safety and Health (I-CASH)