Evaluation of New Test Procedures for Determining Bulk Specific Gravity of Fine Aggregate by Automated Methods
Evaluation of New Test Procedures for Determining Bulk Specific Gravity of Fine Aggregate by Automated Methods
复制标题
通过自动化方法测定细骨料堆积比重的新测试程序的评估
DOI：
10.3141/1874-02
复制
发表时间：
2004
影响因子：
1.7
通讯作者：
N. V. Baker
中科院分区：
文献类型：
--
作者：
B. Prowell;N. V. Baker
两种自动化方法进行了评估，用于确定干容重（Gsb）的细骨料：Theraponne SSDetect和InstroTek CoreLok。根据AASHTO T-84中描述的标准方法对每种拟议方法进行了评价。该评估是基于一项循环研究，有12个实验室和6种材料，4种粉碎细骨料和2种未粉碎（天然）细骨料来源。与AASHTO T-84相比，CoreLok和SSDetect测定细骨料比重的方法可显著节省时间。CoreLok和SSDetect方法通常产生类似于AASHTO T-84的Gsb结果。据信，AASHTO T-84可能无法对含尘量高的角材产生准确的结果。CoreLok和SSDetect表观比重（Gsa）和吸水率结果之间的统计差异比AASHTO T-84产生的结果更频繁。但是，Gsa和吸水率不用于热拌沥青混合料的体积计算。SSDetect提供了比AASHTO T-84更高的精度。CoreLok方法的精度比AASHTO T-84略差，但随着技术人员对该程序的熟悉，预计会有所提高。
Two automated methods were evaluated for determining the dry bulk specific gravity (Gsb) of fine aggregates: 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 12 laboratories 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 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 the CoreLok and SSDetect apparent specific gravity (Gsa) and water absorption results than those produced by AASHTO T-84. However, Gsa and water absorption are not used in volumetric calculations for hot-mix asphalt. SSDetect offers improved precision over AASHTO T-84. The precision of the CoreLok method is slightly worse than that of AASHTO T-84, but it is expected to improve as technicians become more familiar with the procedure.