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Charles McDonald


The City of Phoenix

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The City of Phoenix

Background Information

Employment History

Engineering Supervisor

Federal Bureau of Highways

Web References (10 Total References)

City Of Phoenix - Online Tips City Of Phoenix [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

Frequently Asked Questions [cached]

1960s, Charles McDonald, a former Federal Bureau of Highways (now FHWA) employee and later the Engineering Supervisor Materials Testing Section

About RPA

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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

FAQ [cached]

In the 1960s, Charles McDonald, a former Federal Bureau of Highways (now FHWA) employee and later the Engineering Supervisor

In the mid-1960s, Charles ... [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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