Dynamic Deflections for Determining Structural Rating of Flexible Pavements, HR-178, 1979

The Road Rater is a dynamic deflection measuring apparatus for flexible base pavements. The Road Rater replaces the Benkelman Beam which was last used by the Iowa DOT in 1977. Road Rater test results correlate reasonably well (correlation coefficient = 0.83) with Benkelman Beam test data. The basic differences between the Road Rater and Benkelman Beam are as follows: 1. The Benkelman Beam uses a static 18,000 lb. load while the Road Rater uses a dynamic 800 to 2,000 lb. loading. 2. The Road Rater tests much faster and more economically than the Benkelman Beam. 3. The Road Rater better simulates a moving truck than the Benkelman Beam. The basic operating principle of the Road Rater is to impart a dynamic loading and measure the resultant movement of the pavement with velocity sensors. This data, when properly adjusted for temperature by use of a nomograph included in this report, can be used to determine pavement life expectancy and estimate overlay thickness required. Road Rater testing will be conducted in the spring, when pavements are in their weakest condition, until seasonal correction factors can be developed. The Road Rater does not have sufficient ram weight to effectively evaluate load carrying capacity of rigid pavements. All rigid pavements react similarly to Road Rater testing and generally deflect from 0.65 to 1.30 mils. Research will be contined to evaluate rigid pavements with the Road Rater, however. The Road Rater has proven to be a reliable, troublefree pavement evaluation machine. The deflection apparatus was originally front-mounted,but was rear-mounted during the winter of 1977-78. Since that time, van handling has greatly improved, and front suspension parts are no longer overstressed due to improper weight distribution.

ABD e-News, July 18, 2003

Newsletter for State of Iowa Alcoholic Beverages Division

Lottery Action, August 5-18 2002, Vol.9, no.15,

Newsletter for Iowa Lottrey

Lottery Action, September 23-October 6, 2002, Vol. 9, no. 18

Newsletter for Iowa Lottery

Lottery Action, November 18-December 1, 2002, Vol. 9 no. 22

Newsletter for Iowa Lottery

Lottery Action, September 8-21, 2003, Vol. 10, no. 18

Newsletter for Iowa Lottery

Lottery Action, May 5-18, 2003, Vol. 10, no. 9

Newsletter for Iowa Lottery

Missing Persons Summary, August 18, 2003

Missing persons summary

Lottery Action, April 5-18, 2004, Vol. 11, no. 7

Iowa Lottery Authority Retailer Information Newsletter

ABD e-News June 18, 2004

Weekly Newsletter for the State of Iowa Alcoholic Beverages Division

Iowa Civil Rights Commission Communicator, Fall 2000, Vol. 18, no. 2

Newsletter produced by the Iowa Civil Rights Commission

Lottery Action, September 27-October 10, 2004, Vol. 11, no. 18

Iowa Lottery Retailer Newsletter

ABD e-News February 18, 2005

Weekly Newsletter

ABD e-News March 18, 2005

Weekly Newsletter

Lottery Action, September 26-October 9, Vol. 12, no. 18

Iowa Lottery newsletter for lottery retailers