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Round Robin Evaluation of New Test Procedures for Determining the Bulk Specific Gravity of Fine Aggregate.
| 题名： | Round Robin Evaluation of New Test Procedures for Determining the Bulk Specific Gravity of Fine Aggregate. |
| 作者： | N. V., Baker |
| 关键词： | Case Studies; Cement Additions; Composite Material; Crushed Materials; Dry Bulk Specific Gravity; Fine Aggregate Sources; Hot Mix Asphalt (hma); Instrotek Corelok; Specific Gravity; Standard Method |
| 摘要： | This study evaluated two automated methods for determining the dry bulk specific gravity (Gsb) of fine aggregates, the Thermolyne SSDetect and InstroTek Corelok. Each proposed method was evaluated against the standard method described in AASHTO T 84. The evaluation was based on a round robin study with twelve labs and six materials, four crushed fine and two uncrushed (natural) fine aggregate sources. The Corelok and SSDetect methods of determining fine aggregate specific gravity offer significant timesavings over AASHTO T 84. Both the Corelok and SSDetect methods generally produce Gsb results that are similar to AASHTO T 84. It is believed that AASHTO T 84 may not produce accurate results for angular materials with high dust contents. More frequent statistical differences exist between both the Corelok and SSDetect apparent specific gravity (Gsa) and water absorption results and the AASHTO T 84 results than were observed for Gsb. However, Gsa and water absorption are not used in volumetric calculations for hot mix asphalt. Both new methods offer improved precision as compared to AASHTO T 84, particularly for crushed materials with high dust contents. |
| 报告类型： | 科技报告 |
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