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EVALUATION OF FINE AGGREGATE ANGULARITY USING NATIONAL AGGREGATE ASSOCIATION FLOW TEST.
| 题名： | EVALUATION OF FINE AGGREGATE ANGULARITY USING NATIONAL AGGREGATE ASSOCIATION FLOW TEST. |
| 作者： | Cross-SA; Smith-BJ; Clowers-KA |
| 关键词： | HOT-MIX-ASPHALT; CRUSHED-AGGREGATE; FINE-AGGREGATES; TEST-METHODS; AIR-VOIDS-CONTENT |
| 摘要： | The state of Kansas currently requires a minimum percentage of crushed aggregate in their high-stability hot-mix asphalt mixtures. The current test methods rely on visual and microscopic examination of aggregate samples to determine percent crushed material. The test method for fine aggregates requires the use of a microscope and is time consuming, subjective in nature, and operator dependent. Therefore, it was desirable to develop a simple test that could be utilized in the field to determine aggregate acceptability. The National Aggregate Association (NAA) flow test was modified to replace the use of microscopic evaluation of fine aggregate to determine percent crushed material. The results of the modified flow test were compared with those of the NAA flow test, and the effects of natural sands on the void content were determined. The results from the modified flow test were related to the gyratory elastoplastic index, a measurement of mixture performance. As a result of this study, a new specification was developed utilizing the modified flow test to replace microscopic examination in the determination of percent crushed material. A void content of 46% or greater was found to provide satisfactory performance. |
| 总页数： | Transportation Research Record. 1994. (1437) pp43-50 (6 Fig., 7 Tab., 7 Ref.) |
| 报告类型： | 科技报告 |
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