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AASHTO and ASTM Adopt Ontario Ministry of Transportation Test Method.

The American Society for Testing and Materials (ASTM) and the American Association of State Highway and Transportation Officials (AASHTO) adopted test methods that were developed by the Ministry of Transport of Ontario (MTO) to assess the performance of premium cold mixes for patching.

MTO's Maintenance Office and Bituminous Section of the Materials Engineering, and Research Office, developed two new laboratory test methods and a field evaluation protocol to ensure that an MTO-designated premium cold mix would meet minimum performance criteria. Specifically, the new methods set the requirements for field handling and performance properties. The protocol calls for at least 75 percent of the mix to remain intact for nine months after placement. All mixes are tested through the critical spring-thaw period. The winter mix met all protocol criteria and exceeded required standards.
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Publication:Public Roads
Date:Sep 1, 2000
Words:132
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