Methods to determine long-term durability of Wisconsin aggregates.
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2013-02-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
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Abstract:Wisconsin uses approximately 10 to 11 million tons of aggregates annually in transportation infrastructure projects in the state. The quality of aggregates has a tremendous influence on the performance and durability of roadways and bridges. As sources of quality aggregates dwindle and new recycled/reclaimed aggregates are introduced, it is important that the quality of aggregates used in construction be assessed and controlled through appropriate testing. A number of tests are performed routinely on aggregate sources in Wisconsin. Newer tests such as Micro-Deval are also being performed. It is important to determine whether various tests are related to each other..
What is the Problem?
There are many comparative aggregate tests in the literature. However, there is limited information correlating various tests to long-term field performance. Previous research showed that field performance can be better represented by the Micro-Deval test. There are many aggregates that may be unsatisfactory in the field but perform satisfactorily in some of the tests. The Micro-Deval test measures abrasion resistance and is reported to have a higher accuracy for assessing durability of aggregates than the LA abrasion or magnesium sulfate soundness tests. There is a need for comparative analysis of different aggregate test data using statistical methods to establish whether different tests such as Micro-Deval are independent or related to each other. If the outcomes of a new test are not correlated with one or more results from other tests, then that test is measuring something different which may or may not be relevant to durability in the field.
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