United States Department of Transportation
i
Development of a Correlation between CoreLok and AASHTO T 85 Tests for Specific Gravity of Coarse Aggregates used in Idaho
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2023-02-01
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[PDF-3.88 MB]
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Corporate Contributors:Idaho. Transportation Department. Highway Construction and Operations, Contracting Services, Research Program ; United States. Department of Transportation. University Transportation Centers (UTC) Program ; United States. Department of Transportation. Office of the Assistant Secretary for Research and Technology ; United States. Department of Transportation. Federal Highway Administration
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Edition:Final Report
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Abstract:Specific gravity and absorption values of coarse aggregates are typically measured in accordance with the AASHTO T 85 standard. The test requires considerable experience to recognize the stage when a soaked sample reaches the saturated surface dry (SSD) condition upon drying. The CoreLok device offers an alternative approach which can be completed in less than 45 minutes compared to the 24 hours required by the AASHTO procedure. This study investigated the results from AASHTO T 85 and CoreLok testing of coarse aggregates to develop a correlation between bulk (dry) specific gravity (Gsb) values measured using the two test procedures. Blended samples, consisting of coarse and fine aggregates, were also tested to evaluate the use of the CoreLok method to reliably determine Gsb values. After testing 15 coarse aggregates and 17 blended aggregates, this study developed three equations that may be used to modify the CoreLok Gsb results to more closely reflect Gsb values based on AASHTO T 85 tests. The recommended equation uses the CoreLok Gsb and the fine aggregate percentage to predict the equivalent AASHTO T 85 Gsb with an R2 = 0.967. Furthermore, five reclaimed asphalt pavement (RAP) materials were also tested to see if the Gsb of the uncoated aggregate could be determined using the CoreLok method. Preliminary results indicate that the CoreLok Gsb results can be reliably calculated if the effective and absorbed binder content is known, or presumed, based on experience.
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