Measuring Bulk-Specific Gravity of Fine Aggregates: Development of New Test Method
Measuring Bulk-Specific Gravity of Fine Aggregates: Development of New Test Method
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测量细骨料的堆积比重：新测试方法的开发
DOI：
10.3141/1721-10
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发表时间：
2000
影响因子：
1.7
通讯作者：
M. Huner
中科院分区：
文献类型：
--
作者：
P. Kandhal;R. Mallick;M. Huner
在热拌沥青体积混合料设计（包括Superpave）中使用细骨料的体积比重，以确定骨料吸收的沥青结合料量和矿物骨料中的空隙百分比。现行试验方法（AASHTO T84）采用锥形法确定样品的饱和表面干燥（SSD）条件，这是进行试验所必需的。这种方法不能令人满意地用于非常有棱角且具有粗糙表面纹理的细骨料，因此在SSD条件下不容易坍落。进行了一项研究项目，以开发自动化设备和建立细骨料的SSD条件的方法。将细骨料的湿样品置于旋转鼓中，并使其经受稳定的热空气流。监测进入和排出空气的温度梯度以及排出空气的相对湿度以建立SSD条件。制造了两个原型装置。第二个原型装置的测试结果令人鼓舞，并报告。已经确定了对第二个原型装置进行进一步改进以提高测试的可重复性和再现性。
Bulk specific gravity of the fine aggregate is used in hot-mix asphalt volumetric-mix design (including Superpave) to determine the amount of asphalt binder absorbed by the aggregate and the percentage of voids in the mineral aggregate. The current test method (AASHTO T84) uses a cone method to establish the saturated surface dry (SSD) condition of the sample, which is necessary to conduct the test. This method does not work satisfactorily for fine aggregates that are very angular and have rough surface texture and, therefore, do not slump readily when in SSD condition. A research project was undertaken to develop automated equipment and a method of establishing the SSD condition of the fine aggregate. The wet sample of the fine aggregate is placed in a rotating drum and subjected to a steady flow of warm air. The temperature gradient of the incoming and outgoing air and the relative humidity of the outgoing air are monitored to establish the SSD condition. Two prototype devices were constructed. The test results obtained with the second prototype device are encouraging and are reported. Further improvements to be made to the second prototype device to improve the repeatability and reproducibility of the test have been identified.