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Aggregate Degradation Testing by Gyratory Testing Machine

The Gyratory Testing Machine (GTM) equipped with an air roller was used to investigate the dry and wet degradation of six aggregates. Three gradings similar to those for the Los Angeles (LA) abrasion test were evaluated in the GTM by using 25, 50, 100, and 200 revolutions. The test data indicated substantial differences in gradation of the aggregates after testing. Type and initial size of the aggregate influenced the amount and characteristics of degradation. Regression analyses of the data resulted in the development of GTM degradation prediction equations using the LA abrasion loss. The most important goal for the GTM test results was to define gradation and the effect of moisture, instead of using only a relative indicator such as LA abrasion loss. Four aggregate blends were tested in the GTM to simulate degradation produced in handling and processing of aggregate through a drum mixer and drum dryer. These test results duplicated some of the gradations obtained after the material had passed through the drum.