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City of Phoenix

Background Information

Employment History

Materials Engineer

City of Phoenix

Bureau of Highways

Materials Engineer

Web References (10 Total References)

About RPA

www.rubberpavements.org [cached]

Over 40 year ago, Charlie McDonald, an engineer for the City of Phoenix, developed ad time/temperature formula for mixing scrap tire material and asphalt to develop a material that would make the asphalt behave much like tire rubber. His motivation started earlier when he was with the Bureau of Highways (now FHWA) and traveled extensively in State Parks in California, living in a small trailer with a leaky roof and he needed a flexible material to patch and seal the roof so the rather primitive roadways would not continue to cause cracking.

After he joined the City of Phoenix, he continued his experiments, first in his kitchen and later in the engineering laboratory. When he was satisfied he had achieved the right formula, he took the material to the street s where he covered potholes. Application methods were primitive, but the binder he created started a whole new paving industry.
Charlie McDonald

City Of Phoenix - Online Tips City Of Phoenix

www.fsphoenix.com [cached]

RAC Usage Survey The City of Phoenix Rubberized asphalt was developed in the mid 1960s when Charles McDonald, the Materials Engineer for the City of Phoenix, blended approximately 18 percent crumb ... http://www.rubberizedasph ... g/history/phoenix.htm

Early applications were batch wet ...

www.atrmjordan.com [cached]

Early applications were batch wet processes and were based on the McDonald technology, which was developed in the early 1960's by Charles McDonald, a City of Phoenix engineer, and in the 1970's by Arizona Refining Company (ARCO).

Newszap! City Guide Peoria

www.newszap.com [cached]

Charles McDonald, materials engineer for the city of Phoenix, developed rubberized asphalt in the mid 1960s.

BELCHINA GROUP | Creating Oppurtunities and Sharing Success

www.belchina.org [cached]

In the mid-1960s, Charles McDonald, an engineering supervisor for the city of Phoenix, began looking for a way to maintain cracked pavement. McDonald mixed crumb rubber with asphalt, and the city used the mixture to fill cracks and potholes in city streets.

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